spring receive request parameters:

1. Get it using HttpServletRequest

@RequestMapping("/login.do")
public String login(HttpServletRequest request){
  String name = request.getParameter("name")
  String pass = request.getParameter("pass")
}

2,Spring will automatically inject form parameters into method parameters, and the name property of the form will remain 1. And Struts21

@RequestMapping("/login.do")
public String login(HttpServletRequest request,
                String name,
 @RequestParam("pass")String password) //  The form properties are pass, With variable password receive
{
  syso(name);
  syso(password)
}

3. Automatically inject Bean properties

<form action="login.do">
 User name: <input name="name"/>
 Password: <input name="pass"/>
<input type="submit" value=" landing ">
</form>

// encapsulated User class
public class User{
 private String name;
 private String pass;
}

 @RequestMapping("/login.do")
public String login(User user)
{
  syso(user.getName());
  syso(user.getPass());
}

Pass value to page:

When the Controller component is processed, pass the value to the jsp page,

1, use HttpServletRequest and Session and then setAttribute(), just like 1 in Servlet

2, use the ModelAndView object

3, use the ModelMap object

4. Use the @ModelAttribute annotation

The Model data is passed to success.jsp using HttpServletRequest’s Attribute

@RequestMapping("/login.do")
public ModelAndView login(String name,String pass){
  User user = userService.login(name,pwd);
  Map<String,Object> data = new HashMap<String,Object>();
  data.put("user",user);
  return new ModelAndView("success",data);
}

Example using ModelMap parameter object:

ModelMap data is passed to success.jsp using Attribute of HttpServletRequest

@RequestMapping("/login.do")
public　String login(String name,String pass ,ModelMap model){
  User user = userService.login(name,pwd);
  model.addAttribute("user",user);
  model.put("name",name);
  return "success";
}

Use the @ModelAttribute example

Used on the arguments section of the Controller method or on the Bean attribute method The @ModelAttribute data is passed to success.jsp using HttpServletRequest’s Attribute

@RequestMapping("/login.do")
public String login(@ModelAttribute("user") User user){
  //TODO
  return "success";
}

@ModelAttribute("name")
public String getName(){
  return name;
}

Session storage:

You can take advantage of HttpServletReequest’s getSession() method

@RequestMapping("/login.do")
public String login(String name,String pwd
              ModelMap model,HttpServletRequest request){
   User user = serService.login(name,pwd);
   HttpSession session = request.getSession();
   session.setAttribute("user",user);
   model.addAttribute("user",user);
   return "success";
}

By default, Spring MVC USES forwarding to locate views. If you want to use redirection, you can do the following

1. Use RedirectView

2, use redirect: prefix

public ModelAndView login(){
  RedirectView view = new RedirectView("regirst.do");
  return new ModelAndView(view);
}

Or use the following methods, which are commonly used at work:

public String login(){
  //TODO
  return "redirect:regirst.do";
}