javaEE學習筆記————一個小小的jspDemo

1.模塊要求

1. 簡單功能
		1. 列表查詢
		2. 登錄
		3. 添加
		4. 刪除
		5. 修改
	
2. 複雜功能
	1. 刪除選中
	2. 分頁查詢
		好處:
			1. 減輕服務器內存的開銷
			2. 提升用戶體驗
	3. 複雜條件查詢

2.數據庫設計

如下圖
在這裏插入圖片描述
在這裏插入圖片描述

3.實現的代碼

Github地址:點擊跳轉到github獲取完整代碼
idea開發的

3.1前端的頁面代碼

==登錄頁面:login.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1"/>
    <title>管理員登錄</title>

    <!-- 1. 導入CSS的全局樣式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery導入,建議使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 導入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <script type="text/javascript">
        //切換驗證碼
        function refreshCode(){
            //1.獲取驗證碼圖片對象
            var vcode = document.getElementById("vcode");

            //2.設置其src屬性,加時間戳
            vcode.src = "${pageContext.request.contextPath}/checkCodeServlet?time="+new Date().getTime();
        }
    </script>
</head>
<body>
<div class="container" style="width: 400px;">
    <h3 style="text-align: center;">管理員登錄</h3>
    <form action="${pageContext.request.contextPath}/loginServlet" method="post">
        <div class="form-group">
            <label for="user">用戶名:</label>
            <input type="text" name="username" class="form-control" id="user" placeholder="請輸入用戶名"/>
        </div>

        <div class="form-group">
            <label for="password">密碼:</label>
            <input type="password" name="password" class="form-control" id="password" placeholder="請輸入密碼"/>
        </div>

        <div class="form-inline">
            <label for="vcode">驗證碼:</label>
            <input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="請輸入驗證碼" style="width: 120px;"/>
            <a href="javascript:refreshCode();">
                <img src="${pageContext.request.contextPath}/checkCodeServlet" title="看不清點擊刷新" id="vcode"/>
            </a>
        </div>
        <hr/>
        <div class="form-group" style="text-align: center;">
            <input class="btn btn btn-primary" type="submit" value="登錄">
        </div>
    </form>

    <!-- 出錯顯示的信息框 -->
    <div class="alert alert-warning alert-dismissible" role="alert">
        <button type="button" class="close" data-dismiss="alert" >
            <span>&times;</span>
        </button>
        <strong>${login_msg}</strong>
    </div>
</div>
</body>
</html>

-------------------------------------------------------------------------------------------------

==歡迎頁面:index.jsp==
<%--
  Created by IntelliJ IDEA.
  User: Belief
  Date: 2020/5/28
  Time: 22:47
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="utf-8"/>
  <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
  <meta name="viewport" content="width=device-width, initial-scale=1"/>
  <title>首頁</title>

  <!-- 1. 導入CSS的全局樣式 -->
  <link href="css/bootstrap.min.css" rel="stylesheet">
  <!-- 2. jQuery導入,建議使用1.9以上的版本 -->
  <script src="js/jquery-2.1.0.min.js"></script>
  <!-- 3. 導入bootstrap的js文件 -->
  <script src="js/bootstrap.min.js"></script>
  <script type="text/javascript">
  </script>
</head>
<body>
<div >${user.name},歡迎您</div>
<div align="center">
  <a
          href="${pageContext.request.contextPath}/findUserByPageServlet" style="text-decoration:none;font-size:33px">查詢所有用戶信息
  </a>
</div>

</body>
</html>

-------------------------------------------------------------------------------------------------

==表單頁面:list.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<
<!DOCTYPE html>
<!-- 網頁使用的語言 -->
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的瀏覽器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport視口:網頁可以根據設置的寬度自動進行適配,在瀏覽器的內部虛擬一個容器,容器的寬度與設備的寬度相同。
    width: 默認寬度與設備的寬度相同
    initial-scale: 初始的縮放比,爲1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3個meta標籤*必須*放在最前面,任何其他內容都*必須*跟隨其後! -->
    <title>用戶信息管理系統</title>

    <!-- 1. 導入CSS的全局樣式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery導入,建議使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 導入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
    <style type="text/css">
        td, th {
            text-align: center;
        }
    </style>

    <script>
        function deleteUser(id){
            //用戶安全提示
            if(confirm("您確定要刪除嗎?")){
                //訪問路徑
                location.href="${pageContext.request.contextPath}/delUserServlet?id="+id;
            }
        }

        window.onload = function(){
            //給刪除選中按鈕添加單擊事件
            document.getElementById("delSelected").onclick = function(){
                if(confirm("您確定要刪除選中條目嗎?")){

                   var flag = false;
                    //判斷是否有選中條目
                    var cbs = document.getElementsByName("uid");
                    for (var i = 0; i < cbs.length; i++) {
                        if(cbs[i].checked){
                            //有一個條目選中了
                            flag = true;
                            break;
                        }
                    }

                    if(flag){//有條目被選中
                        //表單提交
                        document.getElementById("form").submit();
                    }

                }

            }
            //1.獲取第一個cb
            document.getElementById("firstCb").onclick = function(){
                //2.獲取下邊列表中所有的cb
                var cbs = document.getElementsByName("uid");
                //3.遍歷
                for (var i = 0; i < cbs.length; i++) {
                    //4.設置這些cbs[i]的checked狀態 = firstCb.checked
                    cbs[i].checked = this.checked;

                }

            }


        }


    </script>
</head>
<body>
<div class="container">
    <h3 style="text-align: center">用戶信息列表</h3>

    <div style="float: left;">

        <form class="form-inline" action="${pageContext.request.contextPath}/findUserByPageServlet" method="post">
            <div class="form-group">
                <label for="exampleInputName2">姓名</label>
                <input type="text" name="name" value="${condition.name[0]}" class="form-control" id="exampleInputName2" >
            </div>
            <div class="form-group">
                <label for="exampleInputName3">籍貫</label>
                <input type="text" name="address" value="${condition.address[0]}" class="form-control" id="exampleInputName3" >
            </div>

            <div class="form-group">
                <label for="exampleInputEmail2">郵箱</label>
                <input type="text" name="email" value="${condition.email[0]}" class="form-control" id="exampleInputEmail2"  >
            </div>
            <button type="submit" class="btn btn-default">查詢</button>
        </form>

    </div>

    <div style="float: right;margin: 5px;">

        <a class="btn btn-primary" href="${pageContext.request.contextPath}/add.jsp">添加聯繫人</a>
        <a class="btn btn-primary" href="javascript:void(0);" id="delSelected">刪除選中</a>

    </div>
    <form id="form" action="${pageContext.request.contextPath}/delSelectedServlet" method="post">
        <table border="1" class="table table-bordered table-hover">
        <tr class="success">
            <th><input type="checkbox" id="firstCb"></th>
            <th>編號</th>
            <th>姓名</th>
            <th>性別</th>
            <th>年齡</th>
            <th>籍貫</th>
            <th>QQ</th>
            <th>郵箱</th>
            <th>操作</th>
        </tr>

        <c:forEach items="${pb.list}" var="user" varStatus="s">
            <tr>
                <td><input type="checkbox" name="uid" value="${user.id}"></td>
                <td>${s.count}</td>
                <td>${user.name}</td>
                <td>${user.gender}</td>
                <td>${user.age}</td>
                <td>${user.address}</td>
                <td>${user.qq}</td>
                <td>${user.email}</td>
                <td><a class="btn btn-default btn-sm" href="${pageContext.request.contextPath}/findUserServlet?id=${user.id}">修改</a>&nbsp;
                    <a class="btn btn-default btn-sm" href="javascript:deleteUser(${user.id});">刪除</a></td>
            </tr>

        </c:forEach>


    </table>
    </form>
    <div>
        <nav aria-label="Page navigation">
            <ul class="pagination">
                <c:if test="${pb.currentPage == 1}">
                    <li class="disabled">
                </c:if>

                <c:if test="${pb.currentPage != 1}">
                    <li>
                </c:if>


                    <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage - 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Previous">
                        <span aria-hidden="true">&laquo;</span>
                    </a>
                </li>


                <c:forEach begin="1" end="${pb.totalPage}" var="i" >


                    <c:if test="${pb.currentPage == i}">
                        <li class="active"><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li>
                    </c:if>
                    <c:if test="${pb.currentPage != i}">
                        <li><a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${i}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}">${i}</a></li>
                    </c:if>

                </c:forEach>


                <li>
                    <a href="${pageContext.request.contextPath}/findUserByPageServlet?currentPage=${pb.currentPage + 1}&rows=5&name=${condition.name[0]}&address=${condition.address[0]}&email=${condition.email[0]}" aria-label="Next">
                        <span aria-hidden="true">&raquo;</span>
                    </a>
                </li>
                <span style="font-size: 25px;margin-left: 5px;">
                    共${pb.totalCount}條記錄,共${pb.totalPage}頁
                </span>

            </ul>
        </nav>


    </div>


</div>


</body>
</html>


-------------------------------------------------------------------------------------------------

==增加數據的頁面:add.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<!-- HTML5文檔-->
<!DOCTYPE html>
<!-- 網頁使用的語言 -->
<html lang="zh-CN">
<head>
    <!-- 指定字符集 -->
    <meta charset="utf-8">
    <!-- 使用Edge最新的瀏覽器的渲染方式 -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <!-- viewport視口:網頁可以根據設置的寬度自動進行適配,在瀏覽器的內部虛擬一個容器,容器的寬度與設備的寬度相同。
    width: 默認寬度與設備的寬度相同
    initial-scale: 初始的縮放比,爲1:1 -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3個meta標籤*必須*放在最前面,任何其他內容都*必須*跟隨其後! -->
    <title>添加用戶</title>

    <!-- 1. 導入CSS的全局樣式 -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <!-- 2. jQuery導入,建議使用1.9以上的版本 -->
    <script src="js/jquery-2.1.0.min.js"></script>
    <!-- 3. 導入bootstrap的js文件 -->
    <script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
    <center><h3>添加聯繫人頁面</h3></center>
    <form action="${pageContext.request.contextPath}/addUserServlet" method="post">
        <div class="form-group">
            <label for="name">姓名:</label>
            <input type="text" class="form-control" id="name" name="name" placeholder="請輸入姓名">
        </div>

        <div class="form-group">
            <label>性別:</label>
            <input type="radio" name="gender" value="" checked="checked"/><input type="radio" name="gender" value=""/></div>

        <div class="form-group">
            <label for="age">年齡:</label>
            <input type="text" class="form-control" id="age" name="age" placeholder="請輸入年齡">
        </div>

        <div class="form-group">
            <label for="address">籍貫:</label>
            <select name="address" class="form-control" id="address">
                <option value="陝西">陝西</option>
                <option value="北京">北京</option>
                <option value="上海">上海</option>
            </select>
        </div>

        <div class="form-group">
            <label for="qq">QQ:</label>
            <input type="text" class="form-control" id="qq" name="qq" placeholder="請輸入QQ號碼"/>
        </div>

        <div class="form-group">
            <label for="email">Email:</label>
            <input type="text" class="form-control" id="email" name="email" placeholder="請輸入郵箱地址"/>
        </div>

        <div class="form-group" style="text-align: center">
            <input class="btn btn-primary" type="submit" value="提交" />
            <input class="btn btn-default" type="reset" value="重置" />
            <input class="btn btn-default" type="button" value="返回" />
        </div>
    </form>
</div>
</body>
</html>

-------------------------------------------------------------------------------------------------

==修改數據的頁面:update.jsp==
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<!-- 網頁使用的語言 -->
<html lang="zh-CN">
    <head>
        <!-- 指定字符集 -->
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>修改用戶</title>

        <link href="css/bootstrap.min.css" rel="stylesheet">
        <script src="js/jquery-2.1.0.min.js"></script>
        <script src="js/bootstrap.min.js"></script>
        <script >
            window.onload=function(){
                document.getElementById("back").onclick=function(){
                    location.href="${pageContext.request.contextPath}/findUserByPageServlet";
                }
            }
        </script>
    </head>
    <body>
        <div class="container" style="width: 400px;">
        <h3 style="text-align: center;">修改聯繫人</h3>
        <form action="${pageContext.request.contextPath}/updateUserServlet" method="post">
            <!--  隱藏域 提交id-->
            <input type="hidden" name="id" value="${user.id}">

          <div class="form-group">
            <label for="name">姓名:</label>
            <input type="text" class="form-control" id="name" name="name"  value="${user.name}" readonly="readonly" placeholder="請輸入姓名" />
          </div>

          <div class="form-group">
            <label>性別:</label>
              <c:if test="${user.gender == ''}">
                  <input type="radio" name="gender" value="" checked /><input type="radio" name="gender" value=""  /></c:if>

              <c:if test="${user.gender == ''}">
                  <input type="radio" name="gender" value=""  /><input type="radio" name="gender" value="" checked  /></c:if>


          </div>

          <div class="form-group">
            <label for="age">年齡:</label>
            <input type="text" class="form-control" value="${user.age}" id="age"  name="age" placeholder="請輸入年齡" />
          </div>

          <div class="form-group">
            <label for="address">籍貫:</label>
             <select name="address" id="address" class="form-control" >
                 <c:if test="${user.address == '陝西'}">
                    <option value="陝西" selected>陝西</option>
                    <option value="北京">北京</option>
                    <option value="上海">上海</option>
                 </c:if>

                 <c:if test="${user.address == '北京'}">
                     <option value="陝西" >陝西</option>
                     <option value="北京" selected>北京</option>
                     <option value="上海">上海</option>
                 </c:if>

                 <c:if test="${user.address == '上海'}">
                     <option value="陝西" >陝西</option>
                     <option value="北京">北京</option>
                     <option value="上海" selected>上海</option>
                 </c:if>
            </select>
          </div>

          <div class="form-group">
            <label for="qq">QQ:</label>
            <input type="text" id="qq" class="form-control" value="${user.qq}" name="qq" placeholder="請輸入QQ號碼"/>
          </div>

          <div class="form-group">
            <label for="email">Email:</label>
            <input type="text" id="email" class="form-control" value="${user.email}" name="email" placeholder="請輸入郵箱地址"/>
          </div>

             <div class="form-group" style="text-align: center">
                <input class="btn btn-primary" type="submit" value="提交" />
                <input class="btn btn-default" type="reset" value="重置" />
                <input id="back" class="btn btn-default" type="button" value="返回" />
             </div>
        </form>
        </div>
    </body>
</html>

js、css、fonts、還有jar包我就不展示了文件

數據庫的連接和封裝看另外兩篇博客,包括增刪改查
地址:基本的封裝
Druid數據庫連接池技術

3.2User實體類

package Per.Belief.domain;

public class User {
    private int id;
    private String name;
    private String gender;
    private int age;
    private String address;
    private String qq;
    private String email;

    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

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

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getQq() {
        return qq;
    }

    public void setQq(String qq) {
        this.qq = qq;
    }

    public String getEmail() {
        return email;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", qq='" + qq + '\'' +
                ", email='" + email + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

3.3PageBean

package Per.Belief.domain;

import java.util.List;

/**
 * 分頁對象
 */
public class PageBean<T> {
    private int totalCount; // 總記錄數
    private int totalPage ; // 總頁碼
    private List<T> list ; // 每頁的數據
    private int currentPage ; //當前頁碼
    private int rows;//每頁顯示的記錄數

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    @Override
    public String toString() {
        return "PageBean{" +
                "totalCount=" + totalCount +
                ", totalPage=" + totalPage +
                ", list=" + list +
                ", currentPage=" + currentPage +
                ", rows=" + rows +
                '}';
    }
}

3.4UserDao

package Per.Belief.dao;

import Per.Belief.domain.User;

import java.util.List;
import java.util.Map;

/**
 * 用戶操作的DAO
 */
public interface UserDao {


    public List<User> findAll();

    User findUserByUsernameAndPassword(String username, String password);

    void add(User user);

    void delete(int id);

    User findById(int i);

    void update(User user);

    /**
     * 查詢總記錄數
     * @return
     * @param condition
     */
    int findTotalCount(Map<String, String[]> condition);

    /**
     * 分頁查詢每頁記錄
     * @param start
     * @param rows
     * @param condition
     * @return
     */
    List<User> findByPage(int start, int rows, Map<String, String[]> condition);
}

UserDaoImpl

package Per.Belief.dao.impl;

import Per.Belief.dao.UserDao;
import Per.Belief.domain.User;
import Per.Belief.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class UserDaoImpl implements UserDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public List<User> findAll() {
        //使用JDBC操作數據庫...
        //1.定義sql
        String sql = "select * from tb_infor";
        List<User> users = template.query(sql, new BeanPropertyRowMapper<User>(User.class));

        return users;
    }

    @Override
    public User findUserByUsernameAndPassword(String username, String password) {
        try {
            String sql = "select * from tb_infor where username = ? and password = ?";
            User user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username, password);
            return user;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

    }

    @Override
    public void add(User user) {
        //1.定義sql
        String sql = "insert into tb_infor values(null,?,?,?,?,?,?,null,null)";
        //2.執行sql
        template.update(sql, user.getName(), user.getGender(), user.getAge(), user.getAddress(), user.getQq(), user.getEmail());
    }

    @Override
    public void delete(int id) {
        //1.定義sql
        String sql = "delete from tb_infor where id = ?";
        //2.執行sql
        template.update(sql, id);
    }

    @Override
    public User findById(int id) {
        String sql = "select * from tb_infor where id = ?";
        return template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), id);
    }

    @Override
    public void update(User user) {
        String sql = "update tb_infor set name = ?,gender = ? ,age = ? , address = ? , qq = ?, email = ? where id = ?";
        template.update(sql, user.getName(), user.getGender(), user.getAge(), user.getAddress(), user.getQq(), user.getEmail(), user.getId());
    }

    @Override
    public int findTotalCount(Map<String, String[]> condition) {
        //1.定義模板初始化sql
        String sql = "select count(*) from tb_infor where 1 = 1 ";
        StringBuilder sb = new StringBuilder(sql);
        //2.遍歷map
        Set<String> keySet = condition.keySet();
        //定義參數的集合
        List<Object> params = new ArrayList<Object>();
        for (String key : keySet) {

            //排除分頁條件參數
            if("currentPage".equals(key) || "rows".equals(key)){
                continue;
            }

            //獲取value
            String value = condition.get(key)[0];
            //判斷value是否有值
            if(value != null && !"".equals(value)){
                //有值
                sb.append(" and "+key+" like ? ");
                params.add("%"+value+"%");//?條件的值
            }
        }
        System.out.println(sb.toString());
        System.out.println(params);

        return template.queryForObject(sb.toString(),Integer.class,params.toArray());
    }

    @Override
    public List<User> findByPage(int start, int rows, Map<String, String[]> condition) {
        String sql = "select * from tb_infor  where 1 = 1 ";

        StringBuilder sb = new StringBuilder(sql);
        //2.遍歷map
        Set<String> keySet = condition.keySet();
        //定義參數的集合
        List<Object> params = new ArrayList<Object>();
        for (String key : keySet) {

            //排除分頁條件參數
            if("currentPage".equals(key) || "rows".equals(key)){
                continue;
            }

            //獲取value
            String value = condition.get(key)[0];
            //判斷value是否有值
            if(value != null && !"".equals(value)){
                //有值
                sb.append(" and "+key+" like ? ");
                params.add("%"+value+"%");//?條件的值
            }
        }

        //添加分頁查詢
        sb.append(" limit ?,? ");
        //添加分頁查詢參數值
        params.add(start);
        params.add(rows);
        sql = sb.toString();
        System.out.println(sql);
        System.out.println(params);

        return template.query(sql,new BeanPropertyRowMapper<User>(User.class),params.toArray());
    }
}

UserService

package Per.Belief.service;


import Per.Belief.domain.PageBean;
import Per.Belief.domain.User;

import java.util.List;
import java.util.Map;

/**
 * 用戶管理的業務接口
 */
public interface UserService {

    /**
     * 查詢所有用戶信息
     * @return
     */
    public List<User> findAll();

    /**
     * 登錄方法
     * @param user
     * @return
     */
    User login(User user);

    /**
     * 保存User
     * @param user
     */
    void addUser(User user);

    /**
     * 根據id刪除User
     * @param id
     */
    void deleteUser(String id);

    /**
     * 根據id查詢
     * @param id
     * @return
     */
    User findUserById(String id);

    /**
     * 修改用戶信息
     * @param user
     */
    void updateUser(User user);

    /**
     * 批量刪除用戶
     * @param ids
     */
    void delSelectedUser(String[] ids);

    /**
     * 分頁條件查詢
     * @param currentPage
     * @param rows
     * @param condition
     * @return
     */
    PageBean<User> findUserByPage(String currentPage, String rows, Map<String, String[]> condition);
}

UserServiceImpl

package Per.Belief.service.impl;

import Per.Belief.dao.UserDao;
import Per.Belief.dao.impl.UserDaoImpl;
import Per.Belief.domain.PageBean;
import Per.Belief.domain.User;
import Per.Belief.service.UserService;

import java.util.List;
import java.util.Map;

public class UserServiceImpl implements UserService {
    private UserDao dao = new UserDaoImpl();

    @Override
    public List<User> findAll() {
        //調用Dao完成查詢
        return dao.findAll();
    }

    @Override
    public User login(User user) {
        return dao.findUserByUsernameAndPassword(user.getUsername(),user.getPassword());
    }

    @Override
    public void addUser(User user) {
        dao.add(user);
    }

    @Override
    public void deleteUser(String id) {
        dao.delete(Integer.parseInt(id));
    }

    @Override
    public User findUserById(String id) {
        return dao.findById(Integer.parseInt(id));
    }

    @Override
    public void updateUser(User user) {
        dao.update(user);
    }

    @Override
    public void delSelectedUser(String[] ids) {
        if(ids != null && ids.length > 0){
            //1.遍歷數組
            for (String id : ids) {
                //2.調用dao刪除
                dao.delete(Integer.parseInt(id));
            }
        }

    }

    @Override
    public PageBean<User> findUserByPage(String _currentPage, String _rows, Map<String, String[]> condition) {

        int currentPage = Integer.parseInt(_currentPage);
        int rows = Integer.parseInt(_rows);

        if(currentPage <=0) {
            currentPage = 1;
        }
        //1.創建空的PageBean對象
        PageBean<User> pb = new PageBean<User>();
        //2.設置參數
        pb.setCurrentPage(currentPage);
        pb.setRows(rows);

        //3.調用dao查詢總記錄數
        int totalCount = dao.findTotalCount(condition);
        pb.setTotalCount(totalCount);
        //4.調用dao查詢List集合
        //計算開始的記錄索引
        int start = (currentPage - 1) * rows;
        List<User> list = dao.findByPage(start,rows,condition);
        pb.setList(list);

        //5.計算總頁碼
        int totalPage = (totalCount % rows)  == 0 ? totalCount/rows : (totalCount/rows) + 1;
        pb.setTotalPage(totalPage);


        return pb;
    }
}

3.5看github吧太多了

4.效果圖

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在這裏插入圖片描述

在這裏插入圖片描述

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