怎样将控制层的数据传回到视图

怎么将控制层的数据传回到视图
Model ModelMap Map ModelAndView 默认都是存入request域中

1.通过Model存入
存入

//方式1  存入model
@RequestMapping("/selectUser")
public String selectUser(Model model)
{
    User user=new User("zhangsan","123",23,new Address("湖北","武汉","汉口大道100号"));

    model.addAttribute("user",user);

    return "showUser";

}

　　

访问

姓名:${user.uname}<br>

　　

2.通过ModelMap或Map存入

//方式二  存入map或者modelmap
@RequestMapping("/selectUser2")
public String selectUser2(ModelMap map)
{
    User user=new User("zhangsan2","123",23,new Address("湖北","武汉","汉口大道100号"));

    map.put("user",user);

    return "showUser";
}

　　

@RequestMapping("/selectUser3") public String selectUser3(Map map) { User user=new User("zhangsan3","123",23,new Address("湖北","武汉","汉口大道100号")); map.put("user",user); return "showUser"; } 

　　

取值:

同上

3.通过ModelAndView存入

//方式3 存入ModelAndView
@RequestMapping("/selectUser4")
public ModelAndView selectUser4()
{
    User user=new User("zhangsan4","123",23,new Address("湖北","武汉","汉口大道100号"));

    //创建ModelAndView对象
    ModelAndView modelAndView=new ModelAndView();

    //将需要传递到视图页面的数据存入
    modelAndView.addObject("user",user);
    //将需要转发的页面存入
    modelAndView.setViewName("showUser");

    return modelAndView;
}

@RequestMapping("/selectUser5")
public ModelAndView selectUser5()
{
    User user=new User("zhangsan5","123",23,new Address("湖北","武汉","汉口大道100号"));

    List<User> userList=new ArrayList<User>();
    userList.add(new User("zhangsan1","123",23,new Address("湖北","武汉","汉口大道100号")));
    userList.add(new User("zhangsan2","123",23,new Address("湖北","武汉","汉口大道100号")));
    userList.add(new User("zhangsan3","123",23,new Address("湖北","武汉","汉口大道100号")));

    ModelAndView modelAndView=new ModelAndView();

    ModelMap modelMap=new ModelMap();
    modelMap.addAttribute("user",user);
    modelMap.addAttribute("userList",userList);

    //将所有的数据 通过 map集合的方式存入
    modelAndView.addAllObjects(modelMap);

    modelAndView.setViewName("showUser2");

    return modelAndView;

}

　　

取值 同上