SpringMVC学习（四）-处理模型数据

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处理模型数据的方式：

ModelAndView

Map

SessionAttributes注解

1.SpringMVCTest.java测试类

package com.springMVC.Helloworld;import java.util.Arrays;import java.util.Date;import java.util.Map;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.CookieValue;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.SessionAttributes;import org.springframework.web.servlet.ModelAndView;@SessionAttributes(value= {"user"},types= {String.class})@RequestMapping("/springmvc")@Controllerpublic class SpringMVCTest {    /*     * @SessionAttributes除了可以通过属性名指定主要放入会话中的属性     * 还可以通过模型的对象类型指定那些模型 需要放到会话中     */    @RequestMapping("/testSessionAttributes")    public String testSessionAttributes(Map<String,Object> map) {        User user=new User("Tom", "123", "123@qq.com", 12);        map.put("user", user);        map.put("school", "XUPT");        return "success";    }    /*     * 目标方法可以添加Map类型     */    @RequestMapping("/testMap")    public String testMap(Map<String,Object> map) {        map.put("names", Arrays.asList("Tom","Jerry","Mike"));        return "success";    }    /*     * 目标方法返回值可以是ModelAndView类型     * 可以包含视图与模型信息     * SpringMVC会把ModelAndView的model中数据放入到request域对象中      */    @RequestMapping("/testModelAndView")    public ModelAndView testModelAndView() {        String viewName="success";        ModelAndView modelAndView=new ModelAndView(viewName);        //添加模型数据到ModelAndView中        modelAndView.addObject("time", new Date());        return modelAndView;    }    @RequestMapping("/testPojo")    public String testPojo(User user) {        System.out.println("testPojo :"+user);        return "success";    }    /*     * @CookieValue映射一个Cook值     */    @RequestMapping("testCookieValue")    public String testCookieValue(@CookieValue("JSESSIONID") String sessionId) {        System.out.println("testCookieValue:sessionId "+sessionId);        return "success";    }}

2.index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!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=ISO-8859-1"><title>Insert title here</title></head> <body><a href="springmvc/testSessionAttributes">testSessionAttributes</a><br><br><a href="springmvc/testMap">testMap</a><br><br><a href="springmvc/testModelAndView">testModelAndView</a><br><br><form action="springmvc/testPojo">    username:<input type="text" name="username"/>    <br>    password:<input type="password" name="password"/>    <br>    email<input type="text" name="email"/>    <br>    age:<input type="text" name="age"/>    <br>    city:<input type="text" name="address.city">    <br>    province:<input type="text" name="address.province">    <br>    <input type="submit" value="submit"></form><a href="springmvc/testCookieValue">testCookieValue</a><br><br></body></html>

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