使用JSP页面和JavaBean相结合的方式（Model1），由JSP页面来接收客户端请求，用JavaBean或其他服务完成业务逻辑、数据库操作和返回页面。我们这里的JavaBean主要是完成特定功能的Java类。
优点：架构简单，比较适合小型项目开发
缺点：JSP职责不单一，职责过重，不便于维护
代码如下
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="doLogin.jsp" method="post">
<table width="300" style="margin:200px auto;" border="1px solid #ccc">
<tr>
<td><label for="username">用户名：</label></td>
<td><input type="text" name="username" /></td>
</tr>
<tr>
<td><label for="password">密码：</label></td>
<td><input type="password" name="password" /></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="登录" /></td>
</tr>
</table>
</form>
</body>
</html>
doLogin.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<jsp:useBean id="loginUser" class="com.po.Users" scope="page"/>
<jsp:useBean id="userDAO" class="com.dao.UsersDAO" scope="page"/>
<jsp:setProperty property="*" name="loginUser"/>
<%
request.setCharacterEncoding("utf-8"); //防止中文乱码
//如果用户名和密码正确，则登录成功
if(userDAO.usersLogin(loginUser)) {
session.setAttribute("loginUser", loginUser.getUsername());
request.getRequestDispatcher("login_success.jsp").forward(request, response);
} else {
response.sendRedirect("login_failure.jsp");
}
%>
Users.java
package com.po;
public class Users {
private String username;
private String password;
public Users() {
}
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;
}
}
UsersDAO.java
package com.dao;
import com.po.Users;
//用户逻辑类
public class UsersDAO {
public boolean usersLogin(Users u) {
if("admin".equals(u.getUsername()) && "123456".equals(u.getPassword())) {
return true;
} else {
return false;
}
}
}
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