Spring MVC使用注解实现帐户注册与登录

时间 2019-12-01

标签 spring mvc 使用注解实现帐户注册登录栏目 Spring 繁體版

原文原文链接

涉及到的注解

@Controller

控制器类html

@RequestMapping

映射路径java

@RequestParam

用于将指定的请求参数赋值给方法中的形参web

定义域对象——User1

用来接受并封装前台传递的数据spring

package com.wen.domain;

import java.io.Serializable;

//实现序列化接口
public class User1 implements Serializable {
    //私有字段
    private String loginName;
    private String password;
    private String username;

    //公共构造器
    public User1(){
        super();
    }


    public String getLoginName() {
        return loginName;
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    public String getPassword() {
        return password;
    }

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

    public String getUsername() {
        return username;
    }

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

定义控制器——UserController

用户处理各类请求数据库

package com.wen.controller;

import com.wen.domain.User1;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

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

//Controller 注解用于指示该类是一个控制器，能够同时处理多个请求动做
@Controller
//RequestMapping 能够用了注释一个控制器类，此时，全部方法都映射为相对于类级别的请求
//表示该控制器处理的全部请求都被映射到value属性所指示的路径下
@RequestMapping(value = "/user")
public class UserController {
    //静态List<User1>集合，此处代替数据库用来保存注册的用户信息
    private static List<User1> user1List;
    //UserController类的构造器，初始化List<User1>集合
    public UserController(){
        super();
        user1List=new ArrayList<>();
    }
    //静态的日志类LogFactory
    private static final Log logger= LogFactory.getLog(UserController.class);
    //该方法映射的请求为http://localhost:8080/.../user/register,该方法支持GET请求
    @RequestMapping(value = "/register",method = RequestMethod.GET)
    public String registerForm(){
        logger.info("register GET方法被调用");
        //跳转到注册界面registerForm.jsp
        return "registerForm";
    }
    //该方法映射的请求为http://localhost:8080/.../user/register,该方法支持POST请求
    @RequestMapping(value = "/register",method = RequestMethod.POST)
    public String register(
        //将请求中的参数进行赋值
        @RequestParam("loginName") String loginName,
        @RequestParam("password") String password,
        @RequestParam("userName") String userName){
        logger.info("register POST方法被调用");
        //建立User对象
        User1 user1 =new User1();
        user1.setLoginName(loginName);
        user1.setPassword(password);
        user1.setUsername(userName);
        //模仿数据库存储的User信息
        user1List.add(user1);
        //跳转到登录界面loginForm.jsp
        return "loginForm";
    }
    //该方法映射的请求为http://localhost:8080/.../user/login
    @RequestMapping("/login")
    public String login(
            //将请求中的参数进行赋值
            @RequestParam("loginName") String loginName,
            @RequestParam("password") String password,
            Model model){
        logger.info("登陆名："+loginName+"密码："+password);
        //到集合中查找用户是否存在，此处用来模拟数据库验证
        for (User1 user1:user1List){
            if (user1.getLoginName().equals(loginName)
                    && user1.getPassword().equals(password)){//若一致
                model.addAttribute("user1",user1);//将数据添加到request中
                return "welcome";//跳转到welcome.jsp
            }
        }
        return "loginForm";//不一致，则跳转到loginFrom.jsp
    }
}

registerForm.jsp

这里的表单会被提交到register请求，使用的是POST请求。
响应的是UserController类中的register()方法。apache

<%--
  Created by IntelliJ IDEA.
  User: wen
  Date: 2019/1/29
  Time: 22:03
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册页面</title>
</head>
<body>
<form action="register" method="post">
    <label for="loginName">登陆名：</label><input type="text" id="loginName" name="loginName">
    <label for="password">密码：</label><input type="password" id="password" name="password">
    <label for="userName">真实姓名：</label><input type="text" id="userName" name="userName">
    <input type="submit" id="submit" value="注册">
</form>
</body>
</html>

loginForm.jsp

这里的表单会被提交到login请求，使用的是POST请求。
响应的是UserController类的login方法。app

<%--
  Created by IntelliJ IDEA.
  User: wen
  Date: 2019/1/29
  Time: 22:07
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>登录页面</title>
</head>
<body>
<form action="login" method="post">
    <label for="loginName">登录名：</label><input type="text" id="loginName" name="loginName">
    <label for="password">密码：</label><input type="password" id="password" name="password">
    <input type="submit" id="submit" value="登录">
</form>
</body>
</html>

welcome.jsp

用于表示登录成功的页面。
此页面接受request中的user1属性中的username属性的值。dom

<%--
  Created by IntelliJ IDEA.
  User: wen
  Date: 2019/1/29
  Time: 22:11
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>欢迎</title>
</head>
<body>
<h3>欢迎【${requestScope.user1.username}】登陆</h3>
</body>
</html>

End~jsp