使用JSP、Servlet、JavaBean实现MVC

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1.新建一个Dynamic Web Project项目，里面新建两个java文件和一个sevlet文件，新建两个HTML文件，整体的框架图如下所示：

2.User.java里面的代码如下所示：

package dto;public class User {private String name;private String pwd;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}}

3.UserCheck里面的代码如下所示：

package service;import dto.User;public class UserCheck {public boolean validate(User user) {if (user != null && user.getName().equals("JSPMVC")) {if (user.getPwd().equals("MVC")) {return true;}return false;}return false;}}

4.LoginCheckServlet里面的代码如下所示：

package servlet;import java.io.IOException;import javax.servlet.RequestDispatcher;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 service.UserCheck;import dto.User;@WebServlet("/LoginCheckServlet")public class LoginCheckServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("GBK");String name = request.getParameter("name");String pwd = request.getParameter("pwd");User user = new User();user.setName(name);user.setPwd(pwd);UserCheck uc = new UserCheck();if (uc.validate(user)) {request.setAttribute("user", user);RequestDispatcher dis = request.getRequestDispatcher("LoginSuccess.jsp");dis.forward(request, response);} else {response.sendRedirect("LoginCheck.jsp");}}}

5.LoginCheck.jsp里面的代码如下所示：

<%@ 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>LoginCheck.jsp</title></head><body><form action="LoginCheckServlet" method="post"><table><tr><td>用户名：</td><td><input type="text" name="name" /></td></tr><tr><td>密码：</td><td><input type="password" name="pwd" /></td></tr><tr><td><input type="submit" value="提交" /></td><td><input type="reset" value="重置" /></td></tr></table></form></body></html>

6.LoginSuccess.jsp里面的代码如下所示：

<%@ 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>LoginSuccess.jsp</title></head><body><jsp:useBean id="user" type="dto.User" scope="request" />恭喜<jsp:getProperty property="name" name="user" />登录成功！</body></html>

7.在浏览器里面输入http://localhost:8080/Servlet/LoginCheck.jsp运行得到如下的结果：

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