package com.itdoc.springmvc.entities;

 import org.springframework.stereotype.Controller;

 import org.springframework.ui.Model;

 import org.springframework.ui.ModelMap;

 import org.springframework.web.bind.annotation.*;

 import org.springframework.web.servlet.ModelAndView;

 import java.util.Arrays;

 import java.util.Date;

 import java.util.List;

 import java.util.Map;

 /**

  * @BLOG http://www.cnblogs.com/goodcheap

  * @DESCRIBE

  * @AUTHOR WángChéngDá

  * @DATE 2017-03-09 13:55

  */

 @Controller

 /**

  * @SessionAttributes 只能定义在 Class, interface , enum 上。

  * @SessionAttributes 除了可以通过属性名指定需要放到会话中的属性外,

  * 还可以通过模型属性的对象类型指定哪些模型属性需要放到会话中。

  * Spring MVC 将在模型中对应的属性暂存到 HttpSession 中。

  * •value:指定的属性名。可以是 String[] 类型的数据。

  * •type:模型属性对应的类型。可以是 Class<?>[] 类型的数据。

  */

 //@SessionAttributes(value = {"time", "names"}, types = {String.class, User.class})

 public class TestModelAndView {

     public static final String SUCCESS = "success";

     @ModelAttribute

     public void getUser(@RequestParam(value = "id", required = false) Integer id,

                         Map map) {

         System.out.println("I am TestModelAndView's getUser method...");

         if (id != null) {

             //模拟从数据库获取对象

             User user = new User(1, "Tom", 12, "123456", "a@aaa.com");

             System.out.println("从数据库中获取一个对象: " + user);

             map.put("user", user);

         }

     }

     @RequestMapping(value = "/updateUser", method = RequestMethod.POST)

     public String updateUser(User user) {

         System.out.println("修改: " + user);

         return SUCCESS;

     }

     @RequestMapping("/getModel")

     public String getModel(Model model) {

         model.addAttribute("names", Arrays.asList("Tom", "Jack", "Lucy", "Mark"));

         model.addAttribute("time", new Date());

         model.addAttribute("school", "东北财经大学");

         model.addAttribute("user", new User("Tom", 13));

         return SUCCESS;

     }

     @RequestMapping("/getModelMap")

     public String getModelMap(ModelMap modelMap) {

         List<String> strings = Arrays.asList("Tom", "Jack", "Lucy", "Mark");

         modelMap.put("names", Arrays.asList("Tom", "Jack", "Lucy", "Mark"));

         modelMap.put("time", new Date());

         modelMap.put("school", "东北财经大学");

         modelMap.put("user", new User("Tom", 13));

         return SUCCESS;

     }

     /**

      * 目标方法的入参中包含 Map, Model, ModelMap 类型的数据, 返回值是 String 类型,

      * Spring MVC 会自动把 Map, Model, ModelMap 转化成模型信息放入到 request 域对象中,

      * 把返回的 String 类型数据转化成视图信息。

      *

      * @param map

      * @return

      */

     @RequestMapping("/getMap")

     public String getMap(Map<String, Object> map, String name) {

         map.put("names", Arrays.asList("Tom", "Jack", "Lucy", "Mark"));

         map.put("time", new Date());

         map.put("school", "东北财经大学");

         map.put("user", new User("Tom", 13));

         return SUCCESS;

     }

     /**

      * 目标的返回值是 ModelAndView, 其中包含视图和模型信息。

      * SpringMVC 会把 ModelAndView 中的 model 模型放入到 request 域对象中。

      *

      * @return

      */

     @RequestMapping("/testModelAndView")

     public ModelAndView testModelAndView() {

         String viewName = SUCCESS;

         ModelAndView mv = new ModelAndView(viewName);

         mv.addObject("names", Arrays.asList("Tom", "Jack", "Lucy", "Mark"));

         mv.addObject("time", new Date());

         mv.addObject("school", "东北财经大学");

         mv.addObject("user", new User("Tom", 13));

         System.out.println(mv);

         return mv;

     }

 }