springmvc get back form submission data - @ ModelAttribute etc.

1, direct mapping parameters to form POJO through annotation ModelAttribute. In action from the write path submission, write the name of the input parameters of the name.

package com.demo.model;

public class user {
    private String username;
    private String password;
    private  int nsex;


    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    public void setNsex(int nsex) {
        this.nsex = nsex;
    }

    public int getNsex() {return nsex;}
}

POJO

<%--
  Created by IntelliJ IDEA.
  User: wym
  Date: 2019/10/8
  Time: 23:17
  To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Login</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/login" method="post">
    用户名：<input type="text" name="username"/> <
    Password:>br> <br<input type="password" name="password"/> <br><br>
    <input type="submit" value="提交"/>
</form>
</body>
</html>

FORM

package com.demo.controller;


import com.demo.model.user;
import com.demo.service.Userservice;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import javax.servlet.http.HttpSession;

@Controller
public class LoginController {
    @Autowired
    private Userservice userService;

    @RequestMapping(value="/login", method= RequestMethod.POST)
      public String hello(@ModelAttribute user u, HttpSession session){

            session.setAttribute("user", u);
        user user = userService.findbyname(u.getUsername());
        if(user == null)
            return "loginfail";
        else if(!user.getPassword().equals(u.getPassword()))
            return "falsepaswd";
        else
        return "helloworld";
    }


}

CONTROLLER

note! ! There's only input parameter name and the name of a member of the domain name pojo said exactly the same can be directly mapped by @ModelAttribute, otherwise parameter will not be assigned a default value in the manner of presentation.

2. clearly can not form the content acquisition is always a pojo property, entirely possible that occur separately. Then you can use @RequestParam acquisition parameters

springmvc get back form submission data - @ ModelAttribute etc.

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