學生成績管理系統

一、系統介紹

軟件環境
OS：Windows10
IDEA：2018.2
Java：jdk1.8
Mysql：8.0.13
Bootstrap:bootstrap.min.css
Juqery:jquery-ui-1.10.4.custom.min.css
Tomcat：8.5.23
Browser:Chrome

該圖書管理系統實現了學生的成績管理。學生實現了登錄登出功能，查看成績功能。教師端實現了註冊登錄，對學生成績和信息進行增刪改查的功能，實現Execl導出成績功能。
數據庫有三張表：一張是學生表（student），一張是教師表（teacher），一張是成績表（score）。
下面是整個工程的截圖

二、系統展示

1.註冊頁面

2.註冊頁面

3.教師端（學生信息管理）頁面

4.教師端（添加學生信息）頁面

5.教師端（學生成績管理）頁面

6.教師端（個人信息）頁面

7.教師端（登出）頁面

8.學生端（我的成績）頁面

9.學生端（個人信息）頁面

10.學生端（登出）頁面

三、代碼實現

1.前端

student(main.jsp)

<%@ page import="dao.StudentDao" %>
<%@ page import="vo.Student" %>
<%@ page import="dao.ScoreDao" %>
<%@ page import="vo.Score" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <title>main</title>
    <link href="../resources/css/default.css" rel="stylesheet"/>
</head>
<body style="background: #c3e6cb">
<%
    Student student = (Student) session.getAttribute("info");
%>
<div id="page" class="container">
    <div id="header">
        <div id="logo">
            <img src="../userImg/<%=student.getId()%>.jpeg"/>
            <h1><%=student.getName()%></h1>
        </div>
        <div id="menu">
            <ul>
                <li><a href="personal.jsp">個人信息</a></li>
                <li class="current_page_item"><a href="main.jsp">我的成績</a></li>
                <li><a onclick="return confirm('確認退出?');" href="../exit">退出登錄</a></li>
            </ul>
        </div>
    </div>
    <div id="main">
        <div class="top">
            <h2 style="color: darkslateblue">我的成績</h2>
            <hr/>
        </div>
        <div class="table">
            <table width="800" frame="box" align="center">
                <tr>
                    <th height="35">學號/工號</th>
                    <th>姓名</th>
                    <th>學院</th>
                    <th>數據庫</th>
                    <th>安卓</th>
                    <th>JSP</th>
                    <%--<th>操作</th>--%>
                </tr>
                <%
                    try {
                        ScoreDao scoD = new ScoreDao();
                        StudentDao stuD = new StudentDao();
                        Score stu = scoD.findWithId(student.getId());
                        String name = stuD.findWithId(student.getId()).getName();
                        String major = stuD.findWithId(student.getId()).getMajor();
                %>
                <tr>
                    <td height="35"><%=stu.getId()%></td>
                    <td><%=name%></td>
                    <td><%=major%></td>
                    <td><%=stu.getDatabase()%></td>
                    <td><%=stu.getAndroid()%></td>
                    <td><%=stu.getJsp()%></td>
                    <%--<td><a href="pdf.jsp?id=<%=stu.getId()%>&name=<%=name%>&major=<%=major%>&database=<%=stu.getDatabase()%>&android=<%=stu.getAndroid()%>&jsp=<%=stu.getJsp()%>">PDF</a></td>--%>
                </tr>
                <%
                    }
                    catch (Exception e){
                        out.print(e);
                    }
                %>
            </table>
        </div>
    </div>
</div>
</body>
</html>

student(person.jsp)

<%@ page import="vo.Student" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <title>main</title>
    <link rel="stylesheet" href="../resources/css/jquery-ui-1.10.4.custom.min.css">
    <script src="../resources/js/jquery-1.10.2.js"></script>
    <script src="../resources/js/jquery-ui-1.10.4.custom.min.js"></script>
    <link href="../resources/css/default.css" rel="stylesheet"/>
</head>
<body style="background: #c3e6cb">
<%
    Student student = (Student) session.getAttribute("info");
%>
<div id="page" class="container">
    <div id="header">
        <div id="logo">
            <img src="../userImg/<%=student.getId()%>.jpeg"/>
            <h1><%=student.getName()%></h1>
        </div>
        <div id="menu">
            <ul>
                <li class="current_page_item"><a href="personal.jsp" style="color: #10707f">個人信息</a></li>
                <li><a href="main.jsp" style="color: #10707f">我的成績</a></li>
                <li><a onclick="return confirm('確認退出?');" href="../exit" style="color: #10707f">退出登錄</a></li>
            </ul>
        </div>
    </div>
    <div id="main">
        <div class="top">
            <h2 style="color: darkslateblue">我的成績</h2>
            <hr/>
        </div>
        <div class="info">
            <img src="../userImg/<%=student.getId()%>.jpeg" class="personalImg"><br>
            <form action="../upload_studentImg" method="post" enctype="multipart/form-data">
                <input type="hidden" name="id" value="<%=student.getId()%>">
                <input type="file" name="img">
                <input type="submit" value="上傳頭像">
            </form>

            <form action="../update_student_email" method="post">
            <table width="400" frame="box" align="center" style="margin-top: 30px;">
                <tr>
                    <td style="font-size: 25px;font-weight: bold">學號</td>
                    <td style="font-size: 25px;font-weight: bold"><%=student.getId()%></td>
                </tr>
                <tr>
                    <td style="font-size: 25px;font-weight: bold">姓名</td>
                    <td style="font-size: 25px;font-weight: bold"><%=student.getName()%></td>
                </tr>
                <tr>
                    <td style="font-size: 25px;font-weight: bold">性別</td>
                    <td style="font-size: 25px;font-weight: bold"><%=student.getSex()%></td>
                </tr>
                <tr>
                    <td style="font-size: 25px;font-weight: bold">學院</td>
                    <td style="font-size: 25px;font-weight: bold"><%=student.getMajor()%></td>
                </tr>
            </table>
            </form>
            <button class="password-btn" style="margin-top: 30px; height: 40px">修改安全信息</button>
        </div>
    </div>
</div>

<%--修改密碼對話框--%>
<div id="password-dialog" title="修改安全信息" style="color: #004085">
    <form id="password-form" method="post">
        <input type="hidden" name="id" value="<%=student.getId()%>">
        <%--郵箱: &nbsp;&nbsp;<input type="email" name="email" value="<%=student.getEmail()%>"><br><br>--%>
        新密碼:<input type="password" name="password"><br>
        <hr>
        <input style="float: right " type="submit" value="取消" onclick="function x() {
          $('#add-dialog').dialog('close');
        }">
        <input style="float: right; margin-right: 25px" type="submit" value="保存"
               onclick="this.form.action='../update_student_security'">
    </form>
</div>

<script>
    $('#password-dialog').dialog({
        width: 340,
        autoOpen: false,
        draggable: false,
        modal: true,
        resizable: false
    });
    $('.password-btn').click(function () {
        $('#password-dialog').dialog('open');
    });
</script>

<style>
    .ui-dialog-titlebar-close {
        display: none
    }
</style>
</body>
</html>

student(resetPassword.jsp)

<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/28
  Time: 19:56
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>重置密碼</title>
    <link rel="stylesheet" href="../resources/css/bootstrap.min.css">
    <link href="../resources/css/forget.css" type="text/css" rel="stylesheet" />
</head>
<body style="background: #c3e6cb">
<h1 style="margin: 0px 80px; color:darkslateblue; font-family: STCaiyun">學生成績管理系統</h1><br>

<%
    String id = request.getParameter("id");
    String email = request.getParameter("email");
    String reset = request.getParameter("reset");
    String code = (String) session.getAttribute("reset");
    if (!reset.equals(code)){
%>
    <script>alert("驗證碼錯誤!");window.location.href='../forget.jsp';</script>
<%
    }
    else {
%>
    <div class="main">
        <form role="form" action="../update_student_security" method="post">
            <div class="form-group" align="center">
                <input class="form-control" type="text" name="password" placeholder="新密碼"><br>
                <input type="hidden" name="id" value="<%=id%>">
                <input type="hidden" name="email" value="<%=email%>">
                <input type="submit" class="btn btn-success" value="提交">
                <input type="button" class="btn btn-info" value="取消" style="margin-left: 20px" onclick="window.location.href='../login.jsp'">
            </div>
        </form>
    </div>
<%
    }
%>
<script src="../resources/js/jquery-3.2.1.min.js"></script>
<script src="../resources/js/popper.min.js"></script>
<script src="../resources/js/bootstrap.min.js"></script>
</body>
</html>

teacher(main.jsp)

<%@ page import="java.util.ArrayList" %>
<%@ page import="vo.Student" %>
<%@ page import="vo.Teacher" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" href="../resources/css/jquery-ui-1.10.4.custom.min.css">
    <script src="../resources/js/jquery-1.10.2.js"></script>
    <script src="../resources/js/jquery-ui-1.10.4.custom.min.js"></script>
    <title>main</title>
    <link href="../resources/css/default.css" rel="stylesheet"/>
</head>
<body style="background: #c3e6cb">
<%
    Teacher teacher = (Teacher) session.getAttribute("info");
    ArrayList<Student> stus = (ArrayList<Student>) session.getAttribute("onePageStudent");
    int sumIndex = (int) session.getAttribute("sumIndex");
%>


<div id="page" class="container">
    <div id="header">

         logo部分
        <div id="logo">
            <img src="../userImg/<%=teacher.getId()%>.jpeg"/>
            <h1><%=teacher.getId()%>
            </h1>
        </div>


        <%-- 左面的功能欄 --%>
        <div id="menu">
            <ul>
                <li><a href="personal.jsp">個人信息</a></li>
                <li class="current_page_item"><a href="../one_page_student">學生信息管理</a></li>
                <li><a href="../one_page_score">學生成績管理</a></li>
                <li><a onclick="return confirm('確認退出?');" href="../exit">退出登錄</a></li>
            </ul>
        </div>

    </div>
    <div id="main">
        <div class="top">
            <h2 style="color: darkslateblue">學生成績管理</h2>
            <hr/>
            <button class="btn-add" style="color: #2980b9">添加學生信息</button>
            <div class="find">
                <form action="../one_page_student" method="post">
                    <input id="find-text" type="text" name="key" placeholder="輸入學號/工號或姓名搜索">
                    <input class="find-btn" type="submit" value="搜索">
                </form>
            </div>
        </div>
        <div class="table">
            <table id="table" width="800" frame="box" align="center">
                <tr>
                    <th height="35">學號/工號</th>
                    <th>姓名</th>
                    <th>性別</th>
                    <th>班級</th>
                    <th>學院</th>
                    <th>操作</th>
                </tr>
                <%
                    for (Student stu : stus) {
                %>
                        <tr>
                            <form method="post" action="../update_student">
                                <td height="35"><%=stu.getId()%></td>
                                <td><input value="<%=stu.getName()%>" name="stuname" class="table-input"></td>
                                <td><input value="<%=stu.getSex()%>" name="stusex" class="table-input"></td>
                                <td><%=stu.getSchool_date()%></td>
                                <td><input value="<%=stu.getMajor()%>" name="stumajor" class="table-input" style="width: 110px"></td>
                                <input value="<%=stu.getId()%>" name="stuno" type="hidden">
                                <td><input type="submit" class="update-btn" value="修改">&nbsp;
                                    <a class="btn-delete" onclick="return confirm('確定要刪除嗎?');"
                                       href=<%="'../delete_student?id=" + stu.getId() + "'"%>>刪除</a>&nbsp;&nbsp;
                                    <a href="../one_page_score?id=<%=stu.getId()%>" style="color: #117a8b">學生成績</a>
                                </td>
                            </form>
                        </tr>
                <%
                    }
                %>
            </table>
        </div>
        <%
            if (sumIndex > 1){
        %>
                <div id="index">
                    <a href="../one_page_student?index=1">首頁</a>
                    <%
                        for (int i=1; i<=sumIndex; i++){
                    %>
                            <a href="../one_page_student?index=<%=i%>">第<%=i%>頁</a>
                    <%
                        }
                    %>
                    <a href="../one_page_student?index=<%=sumIndex%>">尾頁</a>
                </div>
        <%
            }
        %>
    </div>
</div>

<%--添加學生信息對話框--%>
<div id="add-dialog" title="添加學生信息">
    <form id="add-form" method="post">
        學號:<input name="id" type="text"><br>
        姓名:<input name="name" type="text"><br>
        性別:<input name="sex" type="text"><br>
        班級:<input name="school_date" type="text">
        學院:<input name="major" type="text"><br>

        <hr>
        <input style="float: right" type="submit" value="取消" onclick="function x() {
          $('#add-dialog').dialog('close');
        }">
        <input style="float: right; margin-right: 25px" type="submit" value="確定"
               onclick="this.form.action='../add_student'">
    </form>
</div>

<style>
    .ui-dialog-titlebar-close {
        display: none
    }
</style>

<script>
    $('#add-dialog').dialog({
        width: 310,
        autoOpen: false,
        draggable: false,
        modal: true,
        resizable: false
    });
    $('.btn-add').click(function () {
        $('#add-dialog').dialog('open');
    });
</script>
</body>
</html>

teacher(personal.jsp)

<%@ page import="vo.Teacher" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <title>main</title>
    <link href="../resources/css/default.css" rel="stylesheet"/>
</head>
<body style="background: #c3e6cb">
<%
    Teacher teacher = (Teacher) session.getAttribute("info");
%>
<div id="page" class="container">
    <div id="header">
        <div id="logo">
            <img src="../userImg/<%=teacher.getId()%>.jpeg"/>
            <h1><%=teacher.getId()%>
            </h1>
        </div>
        <div id="menu">
            <ul>
                <li class="current_page_item"><a href="personal.jsp">個人信息</a></li>
                <li><a href="../one_page_student">學生信息管理</a></li>
                <li><a href="../one_page_score">學生成績管理</a></li>
                <li><a onclick="return confirm('確認退出?');" href="../exit">退出登錄</a></li>
            </ul>
        </div>
    </div>
    <div id="main">
        <div class="top">
            <h2 style="color: darkslateblue">個人信息</h2>
            <hr/>
        </div>
        <div class="info">
            <img src="../userImg/<%=teacher.getId()%>.jpeg" class="personalImg"><br>
            <form action="../upload_teacherImg" method="post" enctype="multipart/form-data">
                <input type="hidden" name="id" value="<%=teacher.getId()%>">
                <input type="file" name="img">
                <input type="submit" value="上傳頭像">
            </form>
            <form method="post" action="../update_teacher" class="personalForm">
                <input name="uid" value="<%=teacher.getId()%>" type="hidden">
                姓名: <input type="text" name="name" value="<%=teacher.getName()%>" class="personalInput"><br>
                性別: <input type="text" name="sex" value="<%=teacher.getSex()%>" class="personalInput"><br>
                郵箱: <input type="text" name="email" value="<%=teacher.getEmail()%>" class="personalInput"><br>
                密碼: <input type="text" name="password" value="<%=teacher.getPassword()%>" class="personalInput"><br>
                <input type="submit" value="保存" style="width: 100px; height: 30px; margin-top: 20px">
            </form>
        </div>
    </div>
</div>
</body>
</html>

teacher(resetPassword.jsp)

<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/28
  Time: 19:56
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>重置密碼</title>
    <link rel="stylesheet" href="../resources/css/bootstrap.min.css">
    <link href="../resources/css/forget.css" type="text/css" rel="stylesheet" />
</head>
<body>
<h1 style="margin: 0px 80px; color:darkslateblue; font-family: STCaiyun">學生成績管理系統</h1><br>


<%
    String id = request.getParameter("id");
    String reset = request.getParameter("reset");
    String code = (String) session.getAttribute("reset");
    if (!reset.equals(code)){
%>
        <script>alert("驗證碼錯誤!");window.location.href='../forget.jsp';</script>
<%
    } else {
%>
        <div class="main">
            <form role="form" action="../update_teacher_password" method="post">
                <div class="form-group" align="center">
                    <input type="text" class="form-control" name="password" placeholder="新密碼"><br>
                    <input type="hidden" name="id" value="<%=id%>">
                    <input type="submit" class="btn btn-success" value="提交">
                    <input type="button" class="btn btn-info" value="取消" style="margin-left: 20px" onclick="window.location.href='../login.jsp'">
                </div>
            </form>
        </div>
<%
    }
%>
<script src="../resources/js/jquery-3.2.1.min.js"></script>
<script src="../resources/js/popper.min.js"></script>
<script src="../resources/js/bootstrap.min.js"></script>
</body>
</html>

teacher(score.jsp)

<%@ page import="vo.Teacher" %>
<%@ page import="vo.Score" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="dao.StudentDao" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <title>main</title>
    <link href="../resources/css/default.css" rel="stylesheet"/>
</head>
<body style="background: #c3e6cb">
<%
    Teacher teacher = (Teacher) session.getAttribute("info");
    ArrayList<Score> stus = (ArrayList<Score>) session.getAttribute("onePageScore");
    int sumIndex = (int) session.getAttribute("sumScoreIndex");
%>
<div id="page" class="container">
    <div id="header">
        <div id="logo">
            <img src="../userImg/<%=teacher.getId()%>.jpeg"/>
            <h1><%=teacher.getId()%>
            </h1>
        </div>
        <div id="menu">
            <ul>
                <li><a href="personal.jsp">個人信息</a></li>
                <li><a href="../one_page_student">學生信息管理</a></li>
                <li class="current_page_item"><a href="../one_page_score">學生成績管理</a></li>
                <li><a onclick="return confirm('確認退出?');" href="../exit">退出登錄</a></li>
            </ul>
        </div>
    </div>
    <div id="main">
        <div class="top">
            <h2 style="color: darkslateblue">學生成績管理</h2>
            <hr/>
        </div>
        <form method="post" action="../update_score" style="height: 525px; margin-top: 20px">
            <input type="button" class="btn-add" onclick="location.href='score_excel.jsp';" value="導出EXCEL">
            <input type="submit" class="btn-add" style="float: right;margin-bottom: 30px" value="修改">
            <div class="table" style="margin-top: 20px; height: 525px">
                <table id="table" width="800" frame="box" align="center">
                    <tr>
                        <th height="35">學號</th>
                        <th>姓名</th>
                        <th>學院</th>
                        <th>數據庫</th>
                        <th>安卓</th>
                        <th>JSP</th>
                    </tr>
                    <%
                        try {
                            StudentDao stuD = new StudentDao();
                            for (Score stu : stus) {
                                String name = stuD.findWithId(stu.getId()).getName();
                                String major = stuD.findWithId(stu.getId()).getMajor();
                    %>
                    <tr>
                        <td height="35"><%=stu.getId()%></td>
                        <td><%=name%></td>
                        <td><%=major%></td>
                        <td><input value="<%=stu.getDatabase()%>" name="database" class="table-input"></td>
                        <td><input value="<%=stu.getAndroid()%>" name="android" class="table-input"></td>
                        <td><input value="<%=stu.getJsp()%>" name="jsp" class="table-input"></td>
                        <input value="<%=stu.getId()%>" name="id" type="hidden">
                    </tr>
                    <%
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    %>
                </table>

            </div>
        </form>
        <%-- 展示下面的頁籤數 --%>
        <%
            if (sumIndex > 1){
        %>
                <div id="index">
                    <a href="../one_page_score?index=1">首頁</a>
                    <%
                        for (int i = 1; i <= sumIndex; i++) {
                    %>
                    <a href="../one_page_score?index=<%=i%>">第<%=i%>頁</a>
                    <%
                        }
                    %>
                    <a href="../one_page_score?index=<%=sumIndex%>">尾頁</a>
                </div>
        <%
            }
        %>
    </div>
</div>
</body>
</html>

teacher(score_excel.jsp)

<%@ page import="dao.ScoreDao" %>
<%@ page import="vo.Score" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="dao.StudentDao" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="application/msexcel" language="java" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>main</title>
</head>
<body style="background: #c3e6cb">
<%
    out.clearBuffer();
    response.setHeader("Content-Disposition", "attachment;filename=excel.xls");
%>
<table align="center" border="1">
    <tr>
        <th height="35">學號</th>
        <th>姓名</th>
        <th>學院</th>
        <th>數據庫</th>
        <th>安卓</th>
        <th>JSP</th>
    </tr>
    <%
        try {
            ScoreDao scoD = new ScoreDao();
            StudentDao stuD = new StudentDao();
            ArrayList<Score> stus = scoD.getOnePage(1, 10000);
            for (Score stu : stus) {
                String name = stuD.findWithId(stu.getId()).getName();
                String major = stuD.findWithId(stu.getId()).getMajor();
    %>
    <tr>
            <td align="center"><%=stu.getId()%></td>
            <td align="center"><%=name%></td>
            <td align="center"><%=major%></td>
            <td align="center"><%=stu.getDatabase()%></td>
            <td align="center"><%=stu.getAndroid()%></td>
            <td align="center"><%=stu.getJsp()%></td>
    </tr>
    <%
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    %>
</table>
</body>
</html>

code.jsp

<%@ page import="java.awt.image.BufferedImage" %>
<%@ page import="java.awt.*" %>
<%@ page import="java.util.Random" %>
<%@ page import="javax.imageio.ImageIO" %>
<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/22
  Time: 18:48
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="image/JPEG;charset=UTF-8" pageEncoding="UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    response.setCharacterEncoding("utf-8");

    response.setHeader("Cache-Control", "no-cache");
    //創建圖像
    int width = 60, height = 20;
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    //獲取畫筆
    Graphics g = image.getGraphics();
    //設定背景色
    g.setColor(new Color(100, 200, 200));
    g.fillRect(0, 0, width, height);
    //隨機產生四位數字
    Random rnd = new Random();
    int randNum = rnd.nextInt(8999) + 1000;
    String randStr = String.valueOf(randNum);
    //將驗證碼存入session
    session.setAttribute("randStr", randStr);
    //顯示到圖像中
    g.setColor(Color.BLACK);
    g.setFont(new Font("", Font.PLAIN, 20));
    g.drawString(randStr, 10, 17);
    //隨機產生100個干擾點
    for (int i = 0; i < 100; i++) {
        int x = rnd.nextInt(width);
        int y = rnd.nextInt(height);
        g.drawOval(x, y, 1, 1);
    }
    //輸出到頁面
    ImageIO.write(image, "jpeg", response.getOutputStream());
    out.clear();
    out = pageContext.pushBody();
%>
</body>
</html>

login.jsp

<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:16
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title>請登陸</title>
    <link rel="stylesheet" href="resources/css/bootstrap.min.css">
    <link href="resources/css/login.css" type="text/css" rel="stylesheet" />

</head>
<body>
<script>
    function check(form){
        if (form.user.value === "") {
            alert("請輸入賬號！");
            return false;
        }
        if (form.password.value === "") {
            alert("請輸入密碼！");
            return false;
        }
        return true;
    }

</script>
<h1>學生成績管理系統</h1><br>



<div class="main">
    <h5 class="title">
        <a href="login.jsp" id="login">登錄</a>
        <b>&nbsp;·&nbsp;</b>
        <a href="register.jsp" id="register">註冊</a>
    </h5>
    <form action="check_login" method="post" onsubmit="return check(this)">
        <div class="form-group" >
            <input type="text" name="user" class="form-control user" placeholder="請輸入用戶名">
            <input type="password" name="password" class="form-control password" placeholder="請輸入密碼">
            <div class="remember-btn">
                <input type="checkbox" name="remember" value="true">
                <span style="color: #d4edda">記住我</span>
            </div>
            <%--<a href="forget.jsp" class="help" style="color: #1b1e21">登錄遇到問題？</a>--%>
            <input type="submit" value="登錄" class="btn btn-primary btn-lg btn-block" />
        </div>
    </form>
</div>
<script src="resources/js/jquery-3.2.1.min.js"></script>
<script src="resources/js/popper.min.js"></script>
<script src="resources/js/bootstrap.min.js"></script>
</body>
</html>

register.jsp

<%--
  Created by IntelliJ IDEA.
  User: 007
  Date: 2018/11/1
  Time: 20:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title>註冊</title>
    <link rel="stylesheet" href="resources/css/bootstrap.min.css">
    <link href="resources/css/register.css" type="text/css" rel="stylesheet" />
</head>
<body>
<script>
    function check(form){
        if (form.user.value === "") {
            alert("請輸入賬號！");
            return false;
        }
        if (form.password1.value === "") {
            alert("請輸入密碼！");
            return false;
        }
        return true;
    }
    
    function refresh() {
        var i=Math.random();
        document.getElementById("image").src = "code.jsp?a="+i;
    }
</script>
<h1>學生成績管理系統</h1><br>

<div class="main">
    <h5 class="title" >
        <a href="login.jsp" id="login">登錄</a>
        <b>&nbsp;·&nbsp;</b>
        <a href="register.jsp" id="register">註冊</a>
    </h5>
    <form action="check_register" method="post" onsubmit="return check(this)">
        <div class="form-group">
            <input type="email" name="email" class="form-control email" placeholder="安全郵箱">
            <input type="text" name="user" class="form-control user" placeholder="用戶名">
            <input type="password" name="password1" class="form-control password1" placeholder="密碼">
            <input type="text" name="code" placeholder="驗證碼" class="code">
            <img src="code.jsp" id="image" style="float: right; width: 90px;height: 50px; margin-top: 10px" onclick="refresh()">
            <input type="submit" value="註冊" class="btn btn-primary btn-lg btn-block we" />
        </div>
    </form>
</div>
<script src="resources/js/jquery-3.2.1.min.js"></script>
<script src="resources/js/popper.min.js"></script>
<script src="resources/js/bootstrap.min.js"></script>
</body>
</html>

2.後端

Score

package vo;

/**
 * 分數類
 */

public class Score {

    private String id;
    private String database;
    private String android;
    private String jsp;

    public String getId(){
        return id;
    }

    public String getDatabase(){
        return database;
    }

    public String getAndroid(){
        return android;
    }

    public String getJsp(){
        return jsp;
    }

    public void setId(String id){
        this.id = id;
    }

    public void setDatabase(String database){
        this.database = database;
    }

    public void setAndroid(String android){
        this.android = android;
    }

    public void setJsp(String jsp){
        this.jsp = jsp;
    }
}

Student

package vo;

import java.sql.Date;
import java.sql.PseudoColumnUsage;
import java.util.regex.Pattern;

/**
 *學生類
 */

public class Student {

    private String id;
    private String password;
    private String name;
    private String sex;
    private String school_date;
    private String major;
    private String email;

    public String getId(){
        return id;
    }

    public String getPassword(){
        return password;
    }

    public String getName(){
        return name;
    }

    public String getSex(){
        return sex;
    }

    public String getSchool_date(){
        return school_date;
    }

    public String getMajor(){
        return major;
    }

    public String getEmail(){
        return email;
    }

    public void setId(String id){
        this.id = id;
    }

    public void setPassword(String password){
        this.password = password;
    }

    public void setName(String name){
        this.name = name;
    }

    public void setSex(String sex){
        this.sex = sex;
    }

    public void setSchool_date(String school_date){
        this.school_date = school_date;
    }

    public void setMajor(String major){
        this.major = major;
    }

    public void setEmail(String email){
        this.email = email;
    }
}

Teacher

package vo;

/**
 * 教師類
 */

public class Teacher {

    private String id;
    private String password;
    private String email;
    private String name;
    private String sex;

    public String getId(){
        return id;
    }

    public String getPassword(){
        return password;
    }

    public String getEmail(){
        return email;
    }

    public String getName(){
        return name;
    }

    public String getSex(){
        return sex;
    }

    public void setId(String id){
        this.id = id;
    }

    public void setPassword(String password){
        this.password = password;
    }

    public void setEmail(String email){
        this.email= email;
    }

    public void setName(String name){
        this.name = name;
    }

    public void setSex(String sex){
        this.sex = sex;
    }

}

ScoreDao

package dao;

import vo.Score;

import java.sql.*;
import java.util.ArrayList;

public class ScoreDao {

    private Connection conn = null;
    // 定義數據常量
    static String driver = "com.mysql.cj.jdbc.Driver";
    static String url = "jdbc:mysql://localhost:3306/student_manager?serverTimezone=UTC";
    static String user = "root";
    static String password="admin";

    /**
     * 錄入成績
     * @param id
     * @return
     * @throws Exception
     */
    public boolean insertScore(String id) throws Exception{
        initConnection();
        String sql = "insert into score(id) values(?)";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, id);
        int i = ps.executeUpdate();
        closeConnection();
        return i == 1;
    }

    /**
     * 刪除成績
     * @param id
     * @return
     * @throws Exception
     */
    public boolean deleteScore(String id) throws Exception{
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "delete from score where id='"+id+"'";
        int i = stat.executeUpdate(sql);
        closeConnection();
        return i==1;
    }

    /**
     * 更新成績
     * @param id
     * @param database
     * @param android
     * @param jsp
     * @throws Exception
     */
    public void updateScoreInfo(String id, String database, String android, String jsp) throws Exception{

        initConnection();
        String sql = "update score set dat=?, android=?, jsp=? where id=?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, database);
        ps.setString(2, android);
        ps.setString(3, jsp);
        ps.setString(4, id);
        ps.executeUpdate();
        closeConnection();
    }

    /**
     * 以id查找信息
     * @param id
     * @return
     * @throws Exception
     */
    public Score findWithId(String id) throws Exception{
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "select * from score where id = '" + id + "'";
        ResultSet rs = stat.executeQuery(sql);
        Score stu = getScore(rs);
        closeConnection();
        return stu;
    }

    /**
     * 分頁查詢
     * @param page
     * @param size
     * @return
     * @throws Exception
     */
    public ArrayList<Score> getOnePage(int page, int size) throws Exception{
        ArrayList<Score> al = new ArrayList<>();
        initConnection();
        String sql = "SELECT * FROM score limit ?, ?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setInt(1, (page-1)*size);
        ps.setInt(2, size);
        ResultSet rs =  ps.executeQuery();
        getMoreScore(al, rs);
        closeConnection();
        return al;
    }

    /**
     * 查詢總數
     * @return
     * @throws Exception
     */
    public int getScoreCount() throws Exception{
        initConnection();
        String sql = "select count(*) from score";
        Statement stat = conn.createStatement();
        ResultSet rs = stat.executeQuery(sql);
        rs.next();
        int count = rs.getInt(1);
        closeConnection();
        return count;
    }

    /**
     * 獲取成績
     * @param rs
     * @return
     * @throws SQLException
     */
    private Score getScore(ResultSet rs) throws SQLException {
        Score stu = null;
        if (rs.next()){
            stu = new Score();
            stu.setId(rs.getString("id"));
            stu.setDatabase(rs.getString("dat"));
            stu.setAndroid(rs.getString("android"));
            stu.setJsp(rs.getString("jsp"));
        }
        return stu;
    }

    /**
     * 獲取所有成績
     * @param al
     * @param rs
     * @throws SQLException
     */
    private void getMoreScore(ArrayList<Score> al, ResultSet rs) throws SQLException {
        while (rs.next()){
            Score score = new Score();
            score.setId(rs.getString("id"));
            score.setDatabase(rs.getString("dat"));
            score.setAndroid(rs.getString("android"));
            score.setJsp(rs.getString("jsp"));
            al.add(score);
        }
    }

    /**
     * 初始化數據庫連接
     * @throws Exception
     */
    private void initConnection() throws Exception {
        Class.forName(driver);
        conn = DriverManager.getConnection(url, user, password);
    }

    /**
     * 關閉連接
     * @throws Exception
     */
    private void closeConnection() throws Exception{
        conn.close();
    }
}

StudentDao

package dao;

import vo.Student;

import java.sql.*;
import java.util.ArrayList;

/**
 * @author shuijianshiqing
 * @date 2020/6/11 20:40
 * 操作教師信息
 */

public class StudentDao {

    private Connection conn = null;
    // 定義數據常量
    static String driver = "com.mysql.cj.jdbc.Driver";
    static String url = "jdbc:mysql://localhost:3306/student_manager?serverTimezone=UTC";
    static String user = "root";
    static String password="admin";

    /**
     * 驗證學生賬號和密碼
     * @param user
     * @param password
     * @return
     * @throws Exception
     */
    public Student checkAccount(String user, String password) throws Exception {
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "select * from student where id = '" + user + "' and password = '" + password + "'";
        ResultSet rs = stat.executeQuery(sql);
        Student stu = getStudent(rs);
        closeConnection();
        return stu;
    }

    /**
     * 使用學生id來查找學生信息
     * @param id
     * @return
     * @throws Exception
     */
    public Student findWithId(String id) throws Exception{
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "select * from student where id = '" + id + "'";
        ResultSet rs = stat.executeQuery(sql);
        Student stu = getStudent(rs);
        closeConnection();
        return stu;
    }

    /**
     * 使用學生姓名查找學生信息
     * @param name
     * @return
     * @throws Exception
     */
    public ArrayList<Student> findWithName(String name) throws Exception{
        ArrayList<Student> al = new ArrayList<>();
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "select * from student where name = '" + name + "'";
        ResultSet rs = stat.executeQuery(sql);
        getMoreStudent(al, rs);
        closeConnection();
        return al;
    }

    /**
     * 添加學生信息
     * @param id
     * @param name
     * @param sex
     * @param school_date
     * @param major
     * @return
     * @throws Exception
     */
    public boolean insertStudent(String id, String name, String sex, String school_date, String major) throws Exception{
        initConnection();
        String sql = "insert into student(id, name, sex, school_date, major) values(?, ?, ?, ?, ?)";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, id);
        ps.setString(2, name);
        ps.setString(3, sex);
        ps.setString(4, school_date);
        ps.setString(5, major);
        int i = ps.executeUpdate();
        closeConnection();
        return i == 1;
    }

    /**
     * 刪除學生信息
     * @param id
     * @return
     * @throws Exception
     */
    public boolean deleteStudent(String id) throws Exception{
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "delete from student where id='"+id+"'";
        int i = stat.executeUpdate(sql);
        closeConnection();
        return i==1;
    }

    /**
     * 獲取每頁的信息
     * @param page
     * @param size
     * @return
     * @throws Exception
     */
    public ArrayList<Student> getOnePage(int page, int size) throws Exception{
        ArrayList<Student> al = new ArrayList<>();
        initConnection();
        String sql = "SELECT * FROM student limit ?, ?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setInt(1, (page-1)*size);
        ps.setInt(2, size);
        ResultSet rs =  ps.executeQuery();
        getMoreStudent(al, rs);
        closeConnection();
        return al;
    }

    /**
     * 獲取學生總數
     * @return
     * @throws Exception
     */
    public int getStudentCount() throws Exception{
        initConnection();
        String sql = "select count(*) from student";
        Statement stat = conn.createStatement();
        ResultSet rs = stat.executeQuery(sql);
        rs.next();
        int count = rs.getInt(1);
        closeConnection();
        return count;
    }

    /**
     * 更新學生信息
     * @param id
     * @param name
     * @param sex
     * @param major
     * @throws Exception
     */
    public void updateStudentInfo(String id, String name, String sex, String major) throws Exception{

        initConnection();
        String sql = "update student set name=?, sex=?, major=? where id=?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, name);
        ps.setString(2, sex);
        ps.setString(3, major);
        ps.setString(4, id);
        ps.executeUpdate();
        closeConnection();
    }

    /**
     * 更新學生密碼和郵件
     * @param id
     * @param email
     * @param password
     * @throws Exception
     */
    public void updateStudentSecurity(String id, String email, String password) throws Exception{

        initConnection();
        String sql = "update student set password=?, email=? where id=?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, password);
        ps.setString(2, email);
        ps.setString(3, id);
        ps.executeUpdate();
        closeConnection();
    }

    /**
     * 獲取單個學生信息
     * @param rs
     * @return
     * @throws SQLException
     */
    private Student getStudent(ResultSet rs) throws SQLException {
        Student stu = null;
        if (rs.next()){
            stu = new Student();
            stu.setId(rs.getString("id"));
            stu.setPassword(rs.getString("password"));
            stu.setName(rs.getString("name"));
            stu.setSex(rs.getString("sex"));
            stu.setSchool_date(rs.getString("school_date"));
            stu.setMajor(rs.getString("major"));
            stu.setEmail(rs.getString("email"));
        }
        return stu;
    }

    /**
     * 獲取多個學生信息
     * @param al
     * @param rs
     * @throws SQLException
     */
    private void getMoreStudent(ArrayList<Student> al, ResultSet rs) throws SQLException {
        while (rs.next()){
            Student stu = new Student();
            stu.setId(rs.getString("id"));
            stu.setPassword(rs.getString("password"));
            stu.setName(rs.getString("name"));
            stu.setSex(rs.getString("sex"));
            stu.setSchool_date(rs.getString("school_date"));
            stu.setMajor(rs.getString("major"));
            stu.setEmail(rs.getString("email"));
            al.add(stu);
        }
    }

    /**
     * 初始化數據庫連接
     * @throws Exception
     */
    private void initConnection() throws Exception {
        Class.forName(driver);
        conn = DriverManager.getConnection(url, user, password);
    }

    /**
     * 關閉連接
     * @throws Exception
     */
    private void closeConnection() throws Exception{
        conn.close();
    }
}

TeacherDao

package dao;

import vo.Teacher;

import java.sql.*;

/**
 * @author shuijianshiqing
 * @date 2020/6/11 20:40
 * 操作教師信息
 */

public class TeacherDao {

    // 定義連接
    private Connection conn = null;
    // 定義數據常量
    static String driver = "com.mysql.cj.jdbc.Driver";
    static String url = "jdbc:mysql://localhost:3306/student_manager?serverTimezone=UTC";
    static String user = "root";
    static String password="admin";

    /**
     * 驗證教師登錄的賬號和密碼
     * @param id
     * @param password
     * @return
     * @throws Exception
     */
    public Teacher checkAccount(String id, String password) throws Exception {
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "select * from teacher where id = '" + id + "' and password = '" + password + "'";
        ResultSet rs = stat.executeQuery(sql);
        Teacher tea = getTeacher(rs);
        closeConnection();
        return tea;
    }

    /**
     * 使用教師id來查詢教師信息
     * @param id
     * @return
     * @throws Exception
     */
    public Teacher findWithId(String id) throws Exception {
        initConnection();
        Statement stat = conn.createStatement();
        String sql = "select * from teacher where id = '" + id + "'";
        ResultSet rs = stat.executeQuery(sql);
        Teacher tea = getTeacher(rs);
        closeConnection();
        return tea;
    }

    /**
     * 添加教師信息
     * @param id
     * @param password
     * @param email
     * @return
     * @throws Exception
     */
    public Teacher insertTeacher(String id, String password, String email) throws Exception {
        initConnection();
        String sql = "insert into teacher(id, password, email) values(?, ?, ?)";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, id);
        ps.setString(2, password);
        ps.setString(3, email);
        ps.executeUpdate();
        Teacher teacher = findWithId(id);
        closeConnection();
        return teacher;
    }

    /**
     * 更新教師信息
     * @param id
     * @param name
     * @param sex
     * @param email
     * @param password
     * @return
     * @throws Exception
     */
    public Teacher updateTeacher(String id, String name, String sex, String email, String password) throws Exception{

        initConnection();
        String sql = "update teacher set name=?, sex=?, email=?, password=? where id=?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, name);
        ps.setString(2, sex);
        ps.setString(3, email);
        ps.setString(4, password);
        ps.setString(5, id);
        ps.executeUpdate();
        Teacher teacher = findWithId(id);
        closeConnection();
        return teacher;
    }

    /**
     * 更新教師密碼
     * @param id
     * @param password
     * @throws Exception
     */
    public void updateTeacherPassword(String id, String password) throws Exception{

        initConnection();
        String sql = "update teacher set password=? where id=?";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, password);
        ps.setString(2, id);
        ps.executeUpdate();
        closeConnection();
    }

    /**
     * 根據ResultSet來獲取教師信息
     * @param rs
     * @return
     * @throws SQLException
     */
    private Teacher getTeacher(ResultSet rs) throws SQLException {
        Teacher tea = null;
        if (rs.next()) {
            tea = new Teacher();
            tea.setId(rs.getString("id"));
            tea.setPassword(rs.getString("password"));
            tea.setName(rs.getString("name"));
            tea.setEmail(rs.getString("email"));
            tea.setSex(rs.getString("sex"));
        }
        return tea;
    }

    /**
     * 初始化數據庫連接
     * @throws Exception
     */
    private void initConnection() throws Exception {
        Class.forName(driver);
        conn = DriverManager.getConnection(url, user, password);
    }

    /**
     * 關閉連接
     * @throws Exception
     */
    private void closeConnection() throws Exception {
        conn.close();
    }

    /**
     * 測試數據庫連接
     * @param args
     */
    public static void main(String[] args) throws Exception{
        TeacherDao dao = new TeacherDao();
        dao.initConnection();
        System.out.println("數據庫連接成功");
        dao.closeConnection();
    }
}

add_student

package servlet;

import dao.ScoreDao;
import dao.StudentDao;
import dao.StudentDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 添加學生信息
 */

@WebServlet("/add_student")
public class add_student extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();

        StudentDao studentDao = new StudentDao();
        ScoreDao scoreDao = new ScoreDao();

        String id = request.getParameter("id");
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");
        String major = request.getParameter("major");
        String school_date = request.getParameter("school_date");

        try {
            // 添加學生信息
            studentDao.insertStudent(id, name, sex, school_date, major);
            // 添加分數信息
            scoreDao.insertScore(id);
        }
        catch (Exception e){
            out.print(e);
        }
        response.sendRedirect("one_page_student");
    }
}

check_login

package servlet;

import dao.StudentDao;
import dao.TeacherDao;
import vo.Student;
import vo.Teacher;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 檢查登錄
 */

@WebServlet("/check_login")
public class check_login extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);
    }

    protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();

        // 賬號
        String user = request.getParameter("user");
        // 密碼
        String password = request.getParameter("password");
        // 是否記住密碼
        String remember = request.getParameter("remember");

        // 創建Dao層
        TeacherDao teacherDao = new TeacherDao();
        StudentDao studentDao = new StudentDao();

        // 創建實體類
        Teacher teacher = null;
        Student student = null;

        try {
            // 判斷用戶身份
            teacher = teacherDao.checkAccount(user, password);
            student = studentDao.checkAccount(user, password);
        }
        catch (Exception e) {
            out.print(e);
        }

        if (teacher != null) {
            //向session中添加用戶信息
            session.setAttribute("info", teacher);

            //檢查用戶是否需要保持登錄狀態
            if (remember != null) {
                //發送cookie到客戶端
                Cookie userCookie = new Cookie("name", user);
                userCookie.setMaxAge(10);
                response.addCookie(userCookie);
            }
            // 重定向
            response.sendRedirect("one_page_student");
        }
        else if (student != null){
            //向session中添加用戶信息
            session.setAttribute("info", student);

            //檢查用戶是否需要保持登錄狀態
            if (remember != null) {
                //發送cookie到客戶端
                Cookie userCookie = new Cookie("name", user);
                userCookie.setMaxAge(10);
                response.addCookie(userCookie);
            }
            response.sendRedirect("student/main.jsp");
        }
        else {
            out.print("<script>alert(\"用戶名或密碼錯誤！\");");
        }
    }
}

check_register

package servlet;

import dao.TeacherDao;
import vo.Teacher;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 檢查註冊
 */

@WebServlet("/check_register")
public class check_register extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        String email = request.getParameter("email");
        String user = request.getParameter("user");
        String password = request.getParameter("password1");
        String code = request.getParameter("code");

        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();

        String randStr = (String) session.getAttribute("randStr");

        if (!code.equals(randStr)) {
            out.print("<script>alert(\"驗證碼錯誤！\");location.href = \"register.jsp\";</script>");
        } else {

            TeacherDao teacherDao = new TeacherDao();
            Teacher teacher = null;

            try {
                teacher = teacherDao.insertTeacher(user, password, email);
            } catch (Exception e) {
                out.print(e);
            }
            if (teacher != null) {
                //向session中添加用戶信息
                session.setAttribute("info", teacher);
                response.sendRedirect("one_page_student");
            } else {
                out.print("<script>alert(\"此用戶已經註冊！\");location.href = \"register.jsp\";</script>");
            }
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}

delete_student

package servlet;

import dao.ScoreDao;
import dao.StudentDao;
import dao.StudentDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 刪除學生信息
 */

@WebServlet("/delete_student")
public class delete_student extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        StudentDao studentDao = new StudentDao();
        ScoreDao scoreDao = new ScoreDao();

        String id = request.getParameter("id");
        try {
            // 刪除學生
            studentDao.deleteStudent(id);
            // 刪除成績
            scoreDao.deleteScore(id);
            response.sendRedirect("one_page_student");
        }
        catch (Exception e){
            out.print(e);
        }
    }
}

exit

package servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 退出登錄
 */

@WebServlet("/exit")
public class exit extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //清除cookie, 跳到起始頁
        Cookie[] cookies = request.getCookies();
        if (cookies != null) {
            for (Cookie c : cookies) {
                String cookieName = c.getName();
                if ("name".equals(cookieName)) {
                    c.setMaxAge(0);
                    response.addCookie(c);
                }
            }
        }
        response.sendRedirect("index.jsp");
    }
}

one_page_score

package servlet;

import dao.ScoreDao;
import vo.Score;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

/**
 * 分數分頁
 */

@WebServlet("/one_page_score")
public class one_page_score extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();

        // 獲取傳入id的值
        String key = request.getParameter("id");

        if (key == null) {

            int currentIndex, count, size = 10;
            String index = request.getParameter("index");
            if (index == null)
                index = "1";
            currentIndex = Integer.parseInt(index);

            try {
                ScoreDao scoD = new ScoreDao();
                count = scoD.getScoreCount();
                ArrayList<Score> stus = scoD.getOnePage(currentIndex, size);
                int sumIndex = count % size == 0 ? count / size : count / size + 1;
                session.setAttribute("onePageScore", stus);
                session.setAttribute("sumScoreIndex", sumIndex);
                response.sendRedirect("teacher/score.jsp");
            } catch (Exception e) {
                out.print(e);
            }
        }
        else {
            ScoreDao scoreDao = new ScoreDao();
                try {
                    Score score = scoreDao.findWithId(key);
                    ArrayList<Score> scores = new ArrayList<>();
                    scores.add(score);
                    session.setAttribute("onePageScore", scores);
                    session.setAttribute("sumScoreIndex", 1);
                    response.sendRedirect("teacher/score.jsp");
                } catch (Exception e) {
                    out.print(e);
                }
            }
        }
}

one_page_student

package servlet;

import dao.StudentDao;
import vo.Student;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.regex.Pattern;

/**
 *學生分頁
 */


@WebServlet("/one_page_student")
public class one_page_student extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();

        // 獲取key的值
        String key = request.getParameter("key");

        // 如果key爲空或者空字符串
        if (key == null || key.equals("")) {
            int currentIndex, count, size = 10;
            String index = request.getParameter("index");
            if (index == null)
                index = "1";
            // 當前頁賦值
            currentIndex = Integer.parseInt(index);

            try {
                StudentDao sdao = new StudentDao();
                // 查詢當前頁信息
                ArrayList<Student> stus = sdao.getOnePage(currentIndex, size);
                count = sdao.getStudentCount();
                // 計算總頁數
                int sumIndex = count % size == 0 ? count / size : count / size + 1;
                session.setAttribute("onePageStudent", stus);
                session.setAttribute("sumIndex", sumIndex);
                response.sendRedirect("teacher/main.jsp");
            } catch (Exception e) {
                out.print(e);
            }
        }
        else {

            StudentDao studentDao = new StudentDao();
            // 這裏前一個"\"是轉義字符，後一個是字符串，這個字符串表示數字至少出現一次
            String pattern = "^\\d+";
            boolean isMatch = Pattern.matches(pattern, key);
            if (isMatch) {
                try {

                    // 某個學生的信息
                    Student student = studentDao.findWithId(key);
                    ArrayList<Student> students = new ArrayList<>();
                    students.add(student);
                    session.setAttribute("onePageStudent", students);
                    session.setAttribute("sumIndex", 1);
                    response.sendRedirect("teacher/main.jsp");
                } catch (Exception e) {
                    out.print(e);
                }
            } else {
                try {
                    ArrayList<Student> stus = studentDao.findWithName(key);
                    session.setAttribute("onePageStudent", stus);
                    session.setAttribute("sumIndex", 1);
                    response.sendRedirect("teacher/main.jsp");
                } catch (Exception e) {
                    out.print(e);
                }
            }
        }
    }
}

update_score

package servlet;

import dao.ScoreDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 更新成績
 */

@WebServlet("/update_score")
public class update_score extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        ScoreDao scoreDao = new ScoreDao();

        // 把要修改的值存下來
        String[] id = request.getParameterValues("id");
        String[] database = request.getParameterValues("database");
        String[] android = request.getParameterValues("android");
        String[] jsp = request.getParameterValues("jsp");

        try {
            // 循環去更新
            for (int i=0; i<id.length; i++) {
                scoreDao.updateScoreInfo(id[i], database[i], android[i], jsp[i]);
            }
            response.sendRedirect("one_page_score");
        }
        catch (Exception e){
            out.print(e);
        }
    }
}

update_student

package servlet;

import dao.StudentDao;
import dao.StudentDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 更新學生信息
 */

@WebServlet("/update_student")
public class update_student extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        StudentDao studentDao = new StudentDao();

        String stuno = request.getParameter("stuno");
        String stuname = request.getParameter("stuname");
        String stusex = request.getParameter("stusex");
        String stumajor = request.getParameter("stumajor");

        try {
            // 更新學生信息
            studentDao.updateStudentInfo(stuno, stuname, stusex, stumajor);
        }
        catch (Exception e){
            out.print(e);
        }
        response.sendRedirect("one_page_student");
    }
}

update_teacher

package servlet;

import dao.TeacherDao;
import vo.Teacher;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 更新教師信息
 */

@WebServlet("/update_teacher")
public class update_teacher extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");

        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();

        TeacherDao teacherDao = new TeacherDao();

        String uid = request.getParameter("uid");
        String name = request.getParameter("name");
        String sex = request.getParameter("sex");
        String email = request.getParameter("email");
        String password = request.getParameter("password");
        try {
            // 更新教師信息
            Teacher teacher = teacherDao.updateTeacher(uid, name, sex, email, password);
            session.setAttribute("info", teacher);
            out.print("<script>alert(\"保存成功！\");location.href = \"teacher/personal.jsp\";</script>");
        }
        catch (Exception e){
            out.print(e);
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}

upload_studentImg

package servlet;

import com.jspsmart.upload.File;
import com.jspsmart.upload.Request;
import com.jspsmart.upload.SmartUpload;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 更新學生頭像
 */

@WebServlet("/upload_studentImg")
public class upload_studentImg extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();

        SmartUpload smartUpload = new SmartUpload();
        Request rq = smartUpload.getRequest();
        ServletConfig config = this.getServletConfig();
        smartUpload.initialize(config, request, response);
        try {
            //上傳文件
            smartUpload.upload();
            String id = rq.getParameter("id");
            File smartFile = smartUpload.getFiles().getFile(0);
            smartFile.saveAs("/userImg/"+id+".jpeg");
            out.print("<script>alert(\"上傳成功!\");window.location.href='student/personal.jsp';</script>");
        }
        catch (Exception e){
            out.print(e);
        }
    }
}

upload_teacherImg

package servlet;

import com.jspsmart.upload.File;
import com.jspsmart.upload.Request;
import com.jspsmart.upload.SmartUpload;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 更新教師頭像
 */

@WebServlet("/upload_teacherImg")
public class upload_teacherImg extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();

        SmartUpload smartUpload = new SmartUpload();
        Request rq = smartUpload.getRequest();
        ServletConfig config = this.getServletConfig();
        smartUpload.initialize(config, request, response);
        try {
            //上傳文件
            smartUpload.upload();
            String id = rq.getParameter("id");
            File smartFile = smartUpload.getFiles().getFile(0);
            smartFile.saveAs("/userImg/"+id+".jpeg");
            out.print("<script>alert(\"上傳成功!\");window.location.href='teacher/personal.jsp';</script>");
        }
        catch (Exception e){
            out.print(e);
        }
    }
}

所用到的jar包

itextpdf-5.5.5.jar
javax.annotation.jar
javax.ejb.jar
javax.jms.jar
javax.persistence.jar
javax.resource.jar
javax.servlet.jar
javax.servlet.jsp.jar
javax.servlet.jsp.jstl.jar
javax.transaction.jar
jsmartcom_zh_CN.jar
mysql-connector-java-8.0.15.jar

四、感悟及商務合作

這個系統用到了Servlet，相較於上個項目，很多頁面的邏輯可以轉到後臺進行處理，前端的jsp頁面省了好多事情。這樣前端頁面加載也快一點。

1.項目來源

這個項目是從學妹哪裏拿過來的，自己做了一些代碼的註釋和修改工作，這個項目基本的JavaEE的知識點都包括了。但是沒有用到日誌框架，不過用來做簡單的課程設計是綽綽有餘了。

2.圖書管理系統

要是需要圖書管理系統的可以訪問博客，請移步：
圖書管理系統
 圖書管理系統-添加管理增刪改查功能

3.IDEA創建Web項目

要是不知道IDEA如何搭建WEB項目，請移步：
IDEA創建Web項目詳細說明

4.商務合作

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IDEA+Java+Servlet+JSP+Bootstrap+Mysql+Tomcat實現學生成績管理系統