登錄功能
1. 網頁設計
同樣我還是在模板之家下載了這樣一個登錄界面，自己就不設計頁面了 o(*￣▽￣*)o
2.後臺代碼設計
登錄servlet：LoginServlet
package cn.hehewocao.Servlet;
import cn.hehewocao.Dao.AdminDao;
import cn.hehewocao.POJO.Admin;
import cn.hehewocao.Service.AdminService;
import cn.hehewocao.Service.AdminServiceImp;
import org.apache.commons.beanutils.BeanUtils;
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.lang.reflect.InvocationTargetException;
import java.util.Map;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
Admin admin = new Admin();
Map<String, String[]> parameterMap = req.getParameterMap();
try {
BeanUtils.populate(admin,parameterMap);//BeanUtils封裝Admin對象
AdminService as = new AdminServiceImp();
admin = as.login(admin);//查找數據庫
if(admin!=null) {
HttpSession session = req.getSession();
session.setAttribute("admin", admin);//將改admin存入session
resp.sendRedirect(req.getContextPath()+"/findServletByPage");//重定向到FindServletByPage開始查詢用戶信息
}else {
req.setAttribute("login_msg","用戶名或密碼錯誤!");//保存登錄信息用以回顯
req.getRequestDispatcher("/index.jsp").forward(req,resp);
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
AdminServiceImp()類：
package cn.hehewocao.Service;
import cn.hehewocao.Dao.AdminDao;
import cn.hehewocao.Dao.AdminDaoImp;
import cn.hehewocao.POJO.Admin;
/**
* 管理員接口的實現類
*/
public class AdminServiceImp implements AdminService {
@Override
public Admin login(Admin admin) {
return new AdminDaoImp().find(admin.getAdministrators(),admin.getPassword());
}
}
AdminDaoImpl類：
package cn.hehewocao.Dao;
import cn.hehewocao.POJO.Admin;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import cn.hehewocao.JDBC.DBCPUtils;
import javax.sql.DataSource;
import java.sql.SQLException;
/**
* 管理員數據訪問層的實現類
*/
public class AdminDaoImp implements AdminDao {
@Override
public Admin find(String administrator,String password) {
String sql = "select * from admin where administrator = ? and password = ?";
QueryRunner qr = new QueryRunner((DataSource) DBCPUtils.getDateSource());
Admin admin = new Admin();
try {
admin = qr.query(sql, new BeanHandler<Admin>(Admin.class), administrator,password);
} catch (SQLException e) {
e.printStackTrace();
}
return admin;
}
}
3. JSP頁面設計
JSP界面主要用於錯誤信息的回顯。
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<title>管理員登錄</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="application/x-javascript"> addEventListener("load", function () {
setTimeout(hideURLbar, 0);
}, false);
function hideURLbar() {
window.scrollTo(0, 1);
} </script>
<meta name="keywords"
content="Flat Dark Web Login Form Responsive Templates, Iphone Widget Template, Smartphone login forms,Login form, Widget Template, Responsive Templates, a Ipad 404 Templates, Flat Responsive Templates"/>
<link href="css/style.css" rel='stylesheet' type='text/css'/>
<!--webfonts-->
<link href='http://fonts.useso.com/css?family=PT+Sans:400,700,400italic,700italic|Oswald:400,300,700'
rel='stylesheet' type='text/css'>
<link href='http://fonts.useso.com/css?family=Exo+2' rel='stylesheet' type='text/css'>
<!--//webfonts-->
<script src="http://ajax.useso.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
<script>$(document).ready(function (c) {
$('.close').on('click', function (c) {
$('.login-form').fadeOut('slow', function (c) {
$('.login-form').remove();
});
});
});
</script>
<!--SIGN UP-->
<h1>管理員登錄</h1>
<div class="login-form">
<div class="close"></div>
<div class="head-info">
<label class="lbl-1"> </label>
<label class="lbl-2"> </label>
<label class="lbl-3"> </label>
</div>
<div class="clear"></div>
<div class="avtar">
<img src="images/avtar.png"/>
</div>
<form action="${pageContext.request.contextPath}/loginServlet" method="post">
<input type="text" name="administrators" class="text" value="Username" onfocus="this.value = '';"
onblur="if (this.value == '') {this.value = 'Username';}">
<div class="key">
<input type="password" id ="password" name="password" value="Password" onfocus="this.value = '';"
onblur="if (this.value == '') {this.value = 'Password';}">
</div>
<%--<input type="text" name="checkcode" width="50px;"><img src="/hehewocao/checkCodeServlet" height="30px">--%>
<div class="signin">
<input type="submit" value="Login" >
</div>
</form>
</div>
<br>
<p align="center" style="color: red">
<c:if test="${not empty login_msg}"><%--這裏回顯錯誤信息--%>
${login_msg}
</c:if></p>
<div class="copy-rights">
<p>Create By BOOM : [email protected]</p>
</div>
</body>
</html>
好了，到此就完成了管理員登錄的功能。
源碼在我的GitHub上：[email protected]:hehewocao00544/JavaEE.git