Spring mvc 中处理模型数据 ModelAndView

Spring mvc 中处理模型数据  ModelAndView

原文： http://blog.csdn.net/jingyuan_/article/details/9625125

将模型数据暴露给视图是Spring MVC框架的一项重要工作，SpringMVC提供了多种途径输出模型数据：

1.ModelAndView

2.@ModelAttribute

3.Map及Model

4.@SessionAttributes

例子如下：

 package com.test.controller;

 import java.util.Map;

 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.servlet.ModelAndView;

 import com.test.model.User;

 @Controller
 @RequestMapping("/mavc")
 public class ModelAndViewController {
     /**
      * 处理模型数据1：ModelAndView
      * @return
      */
     @RequestMapping("method1")
     public ModelAndView method1(){
         ModelAndView mav = new ModelAndView();
         User u = new User();
         u.setUserName("1");
         mav.addObject("user1", u);
         mav.setViewName("modelandview");
         return mav;
     }

     /**
      * 处理模型数据2：@ModelAttribute
      * @param user
      * @return
      */
     @RequestMapping("method2")
     public String method2(@ModelAttribute("user")User user){
         user.setUserName("汤姆");
         return "/mavc/handle61";
     }

     @ModelAttribute("user")
     public User getUser(){
         User user = new User();
         user.setUserName("汤姆");
         return user;
     }
     /**
      * 处理模型数据3：Map及Model
      * @param map
      * @return
      */
     @RequestMapping("method3")
     public String method3(Map<String,Object> map){
         User user = new User();
         user.setRealName("汤姆");
         map.put("user", user);
         return "/mavc/method3";
     }
     @RequestMapping("method4")
     public String method4(ModelMap modelMap){
         User user = new User();
         user.setRealName("汤姆");
         modelMap.put("user", user);
         return "/mavc/method4";
     }

     /**
      * 处理模型数据4：@SessionAttributes("user")
      * 详见SessionAttributesController
      * */
 }

 package com.test.controller;

 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.SessionAttributes;
 import org.springframework.web.bind.support.SessionStatus;

 import com.test.model.User;

 @Controller
 @RequestMapping("/sac")
 @SessionAttributes("user")
 public class SessionAttributesController {

     @ModelAttribute("user")
     public User getUser(){
         User user = new User();
         user.setUserName("汤姆");
         return user;
     }

     @RequestMapping("method1")
     public String method1(@ModelAttribute("user") User user){
         user.setUserName("Tom");
         return "redirect:method2";
     }
     @RequestMapping("method2")
     public String method2(ModelMap modelMap,SessionStatus sessionStatus){
         User user = (User)modelMap.get("User");
         if(user != null){
             user.setUserName("Tim");
             sessionStatus.setComplete();
         }
         return "sac/method2";
     }
 }