Version: Next

ModelAndView

处理提交数据

  1. 提交的域名称和处理方法的参数名不一致

    • http://localhost:8080/hello?username=bsx

      @Controller
      public class RESTFulController {
      @RequestMapping("/hello")
      public String hello(@RequestParam("username") String name){
      System.out.println(name);
      return "hello";
      }
      }

      推荐任何时候都把@RequestParam加上

  2. 提交的是一个对象 http://localhost:8080/hello/user?name=bsx&id=1&age=18

    public class User {
    private int id;
    private String name;
    private int age;
    }
    @Controller
    public class RESTFulController {
    @RequestMapping("/user")
    public String hello(User user){
    System.out.println(user);
    return "hello";
    }
    }

    参数名和属性名对应不上的话就不匹配不上，无法对应的值会被设定为null

数据显示到前端

ModelAndView

@RequestMapping("/tset1")
public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
//返回一个模型视图对象
ModelAndView mv = new ModelAndView();
mv.addObject("msg","ControllerTest1");
mv.setViewName("test");
return mv;
}

ModelMap

继承了LinkedHashMap

@RequestMapping("/test2")
public String hello(@RequestParam("username") String name, ModelMap model){
//封装要显示到视图中的数据
//相当于req.setAttribute("name",name);
model.addAttribute("name",name);
System.out.println(name);
return "hello";
}

Model

精简版ModelMap,大部分情况下用Model就够了

@RequestMapping("/test3")
public String hello(@RequestParam("username") String name, Model model){
//封装要显示到视图中的数据
//相当于req.setAttribute("name",name);
model.addAttribute("msg",name);
System.out.println(name);
return "test";
}
  • Model:几个简单的方法用于存储数据，简化了新手对Model对象的操作和理解
  • ModelMap：继承了LinkedHashMap，具有LinkedHashMap的方法和特性
  • ModelAndView：可以在存储数据的同时，可以设置返回的逻辑视图。