MVC是模型(Model)、视图(View)、控制器(Controller)的简写，是一种软件设计规范。就是将业务逻辑、数据、显示分离的方法来组织代码。MVC主要作用是降低了视图与业务逻辑间的双向偶合。MVC不是一种设计模式，MVC是一种架构模式。当然不同的MVC存在差异。
最典型的MVC就是JSP + servlet + javabean的模式。
示例代码：
HelloServlet.java
package com.test.controller; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; public class HelloServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String method = request.getParameter("method"); if (method.equals("add")){ request.getSession().setAttribute("msg","add"); }else if(method.equals("sub")){ request.getSession().setAttribute("msg","sub"); } request.getRequestDispatcher("index.jsp").forward(request,response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } }
web.xml文件配置：
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>HelloServlet</servlet-name> <servlet-class>com.test.controller.HelloServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloServlet</servlet-name> <url-pattern>/user</url-pattern> </servlet-mapping> </web-app>
index.jsp 示例：
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> </head> <body> ${msg} </body> </html>
测试：
原文：https://www.cnblogs.com/windtalker/p/14014580.html