java web mvc思想介绍

来源：互联网发布：python url编码编辑：程序博客网时间：2024/06/06 01:11

1、首先简单介绍一下什么是MVC思想。

在百度百科里面对MVC的说明，MVC全名是Model View Controller，是模型(model)－视图(view)－控制器(controller)的缩写。那么在JAVA的web开发中，MVC分别是对应于：显示页面（视图）、数据对象（模型）、业务处理（控制器）。

简单举个例子来说，在学生信息管理系统里，登陆界面就是一个视图，而登陆完成后，进行用户名和密码判断并跳转相应的页面，就是控制器，而保存用户名和密码的对象，就是模型。三者的关系就是这样。我们下面给出了一个java动态网页的例子。

2、文件结构

3、所要用到的

tomcat7.0

4、代码结构

UserCheck

package com.test.dao;import com.test.vo.User;public class UserCheck {public boolean login(User user){if(user.getUsername().equals("admin") && user.getPassword().equals("123456"))return true;return false;}}

UserLogin

package com.test.service;import java.io.IOException;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 com.test.dao.UserCheck;import com.test.vo.User;/** * Servlet implementation class UserLogin */@WebServlet("/UserLogin")public class UserLogin extends HttpServlet {private static final long serialVersionUID = 1L;    /**     * Default constructor.      */    public UserLogin() {        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubUser u=new User();u.setUsername(request.getParameter("username"));u.setPassword(request.getParameter("password"));System.out.println(request.getParameter("username")+" "+request.getParameter("password"));UserCheck dao=new UserCheck();if(dao.login(u)){response.sendRedirect("login_s.jsp");}else{response.sendRedirect("login_f.jsp");}}}

User

package com.test.vo;public class User {private String username;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;}private String password;}

静态页面比较简单，就不贴上来了。

0 0