springmvc的model是实体类，可以理解为把数据库里的一张表变成了一个对象
/** * */ package com.test.model; /** * @ClassName: User.java * @Description: TODO(用一句话描述该文件做什么) * * @author JerryZhou * @Date 2014-7-15 上午10:24:04 */ public class User { public int id; public String name; public String sex; /** * @return the id */ public int getId() { return id; } /** * @param id the id to set */ public void setId(int id) { this.id = id; } /** * @return the name */ public String getName() { return name; } /** * @param name the name to set */ public void setName(String name) { this.name = name; } /** * @return the sex */ public String getSex() { return sex; } /** * @param sex the sex to set */ public void setSex(String sex) { this.sex = sex; } }
controller控制器，把model里的对象拿来，进行一些动作
/** * */ package com.test.controller; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.multiaction.MultiActionController; import com.test.model.User; /** * @ClassName: HelloWorldController.java * @Description: TODO(用一句话描述该文件做什么) * * @author JerryZhou * @Date 2014-7-14 下午5:54:46 */ public class HelloWorldController extends MultiActionController{ // http://localhost:8080/SpringMVCTest/hellowlrld public ModelAndView handleRequest(HttpServletRequest arg0,HttpServletResponse arg1) throws Exception { User user = new User(); user.setId(1); user.setName("Test"); user.setSex("男"); List<User> usrst = new ArrayList<User>(); User user1 = new User(); user1.setId(2); user1.setName("张三"); user1.setSex("男"); usrst.add(user1); User user2 = new User(); user2.setId(3); user2.setName("李四"); user2.setSex("女"); usrst.add(user2); User user3 = new User(); user3.setId(4); user3.setName("王五"); user3.setSex("男"); usrst.add(user3); Map<String, Object> model =new HashMap<String, Object>(); model.put("usrst", usrst); ModelAndView mv = new ModelAndView(); mv.addObject(user); mv.addAllObjects(model); mv.setViewName("welcome"); return mv; } }
然后就是视图层
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> Welcome ${user.name} <br><br> Welcome ${user.sex} <br><br> User List<br/><br> <table border=""> <tr> <td>序号</td> <td>编号</td> <td>名称</td> <td>性别</td> </tr> <c:forEach items="${usrst }" var="usr" varStatus="status"> <tr> <td>${status.index + 1 }</td> <td>${usr.id }</td> <td>${usr.name }</td> <td>${usr.sex }</td> </tr> </c:forEach> </table> </body> </html>
从请求地址（控制器->model;控制器->view）到输出，这个规则是路由定制的，配置文件是这样的
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/"></property> <property name="suffix" value=".jsp"></property> </bean>
<bean name="/hellowlrld" class="com.test.controller.HelloWorldController"></bean> （重要）
</beans>
xml里控制了访问（当访问url/hellowlrld时，请求com.test.controller.HelloWorldController这个控制器）
一个user的表，里面有id，name，sex。。。映射成面向对象（表即对象，字段即属性）
控制器使用这个对象（即操作这个表）
new一个user对象
为id赋值为1
为name赋值为test
为sex赋值为男
new一个list对象，并把user放list里，变成一个数组（？。。。。）
new一个user对象
为id赋值为2
为name赋值为张三
。。。
。。。。
。。。。
mv.setViewName("welcome");
最后去welcome.jsp这个页面