Model/ModelMap 和 ModelAndView 的区别使用

 

Model/ModelMap

controller:

package springmvc.controller;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import springmvc.model.User;@Controllerpublic class HelloController {	private static final Log logger = LogFactory.getLog(HelloController.class);		@ModelAttribute	public void userModel(String name, String password, Model model)	{		logger.info("userModel");		//创建userModel		User user = new User();		user.setName(name);		user.setPassword(password);		//user对象存在model当中		model.addAttribute("user", user);	}			@RequestMapping(value="/hello", method=RequestMethod.GET)    public String hello()    {              return "index";    }			@RequestMapping(value="/login", method=RequestMethod.POST)	public String post(Model model)	{		//从model中取出之前存的user对象		User user = (User) model.asMap().get("user");		System.out.println(user);		//设置user对象		user.setName("测试");		model.addAttribute("sucess", "ok");		System.out.println(user);		return "post";	}								}

　　

jsp:

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
     
     
      	姓名：
      	
      
	密码：
      	
      
	
      
     

　　

post.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"   pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ page isELIgnored="false"%>
     
post
name: ${user.name}
passwod: ${user.password}
${sucess}

　　

 

ModelAndView

controller:

package springmvc.controller;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import springmvc.model.User;@Controllerpublic class Hello2Controller {		private static final Log logger = LogFactory.getLog(Hello2Controller.class);		@ModelAttribute	public void userModel(String name, String password, ModelAndView mv)	{		logger.info("usermodel");		User user = new User();		user.setName(name);		user.setPassword(password);				mv.addObject("user", user);	}		@RequestMapping(value="/h2", method=RequestMethod.GET)	public ModelAndView  index()	{		//return new ModelAndView("hello2_index", "commond", new User());		 return new ModelAndView("h2_index", "command", new User());	}		@RequestMapping(value="/lh2",method=RequestMethod.POST)	public ModelAndView post( ModelAndView mv)	{		logger.info("hello2_index_h2");		//从modelAndView中的model里获取user		User user = (User) mv.getModel().get("user");		System.out.println(user);				if( user !=null)			user.setName("ccccc");				mv.setViewName("h2_post");		return mv;	}	}

　　

jsp

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
     
     
      	name: 
      	password: 
      	
      
     

　　

h2_post.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"   pageEncoding="utf-8"%><%@ page isELIgnored="false" %>
     
post
name: ${user.name}
password:  ${user.password}