Processing springmvc (5) data

1. processing data submitted

The domain a) submitted by the same name and parameters can be submitted:

http://localhost:8080/hello?name=zhangsan

   @RequestMapping("/hello")
    public String hello(String name){
        System.out.println(name);
        return "hello";
    }

b) If the domain name and parameter names submitted by inconsistency:

http://localhost:8080/hello?uname=zhangsan

  @RequestMapping("/hello")
    public String hello(@RequestParam("uname") String name){
        System.out.println(name);
        return "hello";
    }

If uname not turn around, will report an error

c) If the submission is an object:

The same property name and domain name of the object submitted, the parameters of the processor using the corresponding object can be:

http://localhost:8080/user?name=zhangsan&pws=123

 @RequestMapping("/user")
    public String user(User user){
        System.out.println(user);
        return "hello";
    } 

Entity classes:

public class User {
    private String name;
    private String pws;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPws() {
        return pws;
    }

    public void setPws(String pws) {
        this.pws = pws;
    }
}

2. The display data to the ui layer:

a) by ModelAndView, there is no view resolvers are the same, it is necessary to return ModelAndView.

  @RequestMapping("/hello")
    public ModelAndView hello(HttpServletRequest request,HttpServletResponse response){
        ModelAndView modelAndView = new ModelAndView();
        //相当于request.setAttribute("msg","modelAndView");
        modelAndView.addObject("msg","modelAndView");
        modelAndView.setViewName("hello");
        return modelAndView;
    }

b) By ModelMap, there is no view resolvers are the same, but the parameters need to be as ModelMap processor.

@RequestMapping("/hello")
public String hello(ModelMap modelMap){
    //相当于request.setAttribute("msg","modelMap");
    modelMap.addAttribute("msg","modelMap");
    return "index.jsp";
}