SpringMVC 入门——③[登录注册（小demo)]

前期准备

建议先看完 Spring-MVC ② [常见和只需要了解的注释] 再食用

因为是小demo 所以一切从简，主要演示基本功能

1.注册.jsp 登录.jsp 主界面.jsp 登录成功.jsp

A 主界面.jsp

能用就行

<a href="${pageContext.request.contextPath}/user/addUser">用户注册</a>
<a href="${pageContext.request.contextPath}/user/showLogin">用户登录</a>

注意！！！

建议养成写

{pageContext.request.contextPath}

这个EL表达式的习惯，这个表达式的作用是：取出部署的应用程序名，这样不管如何部署，所用路径都是正确的

B 注册界面.jsp

<%--
  Created by IntelliJ IDEA.
  User: Tenkinoko
  Date: 2021/6/24
  Time: 19:26
  To change this template use File | Settings | File Templates.
--%>
    
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>用户注册</title>
</head>
<body>
    <h3>用户注册</h3>
<form method="post" action="${pageContext.request.contextPath}/user/addregUser">
    <table>
        <tr>
            <td><label>登录名</label></td>
            <td><input type="text" name="uname"></td>
        </tr>
        <tr>
            <td><label>登录密码</label></td>
            <td><input type="password" name="upassword"></td>
        </tr>
        <tr>
            <td><label>用户名</label></td>
            <td><input type="text" name="un"></td>
        </tr>
        <tr>
            <td><label>注册</label></td>
            <td><input type="submit" name="注册"></td>
        </tr>
    </table>
</form>
</body>
</html>

C 登录界面.jsp

<%--
  Created by IntelliJ IDEA.
  User: Tenkinoko
  Date: 2021/6/24
  Time: 19:26
  To change this template use File | Settings | File Templates.
--%>
    
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录界面</title>
</head>
<body>
<h3>用户登录</h3>
<form method="post" action="${pageContext.request.contextPath}/user/loginUser">
    <table>
        <tr>
            <td><label>登录账号</label></td>
            <td><input type="text" name="uname"></td>
        </tr>
        <tr>
            <td><label>登录密码</label></td>
            <td><input type="password" name="upassword"></td>
        </tr>
        <tr>
            <td><input id="submit" type="submit" name="登录"></td>
        </tr>
    </table>
</form>
</body>
</html>

D 登录成功

写个你喜欢的jsp文件就行

<%--
  Created by IntelliJ IDEA.
  User: Tenkinoko
  Date: 2021/6/23
  Time: 19:06
  To change this template use File | Settings | File Templates.
--%>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>皆さん❕</h1>
    <h2> 大好き❕</h2>
    <h3>あいしてる！</h3>
</body>
</html>

2.Controller层的一个方法

package com.Ten.handler;

import com.Ten.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.ArrayList;
import java.util.List;

@RequestMapping("/user")
@Controller
public class UserHandler {
   private  static List<User> list = new ArrayList<>();

   @RequestMapping("/addUser")
    public String addUser(){
       return "regUser";
   }

   @RequestMapping("/loggin")
   public String logins(){ return  "login";}

   @RequestMapping("/addregUser")
    public String regUser(@RequestParam("uname") String name,
                          @RequestParam("upassword") String password,
                          @RequestParam("un") String un){
       User user = new User(name,password,un);
       list.add(user);
       return "login";
   }

   @RequestMapping("/loginUser")
    public String login(@RequestParam("uname") String name,
                        @RequestParam("upassword") String password){
       for(User user:list){
           if(user.getUname().equals(name)&&user.getUpassword().equals(password)){
               return "mvc";
           }
       }
       return "login";
   }


}

3.pojo实现层的一个方法

package com.Ten.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private String uname;
    private String upassword;
    private String un;

}