简介：本次实现的是一个完整的登录注册功能，其中用到的技术为Springboot+Vue+Mybatis;

在本文不再详细讲Springboot使用Mybatis进行增删改查，只展示本功能需要用到的代码；

有需要的可以查看这篇文章：实现springboot与mybatis的增删改查

前端需要引入的框架：

bootstrap是CSS框架；

axios用来进行前后端数据交互；

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
首先创建一个register.html
<form id = "app">
        <img src="/img/P.png" width="72" height="72">
        <h2 class="=form-signin0-heading">Please regist</h2>
        <input class="form-control" v-model="userName" type="text" placeholder="用户名" @blur="blur" @focus="focus" @input="userNameLimit"> <span v-html="msg"></span><br>
        <input class="form-control" v-model="userPassword" type="password" placeholder="密码" @input="userPasswordLimit"><br>
        <button class="btn btn-lg btn-primary btn-block" type="button" @click="register">Regist</button>
    </form>

在注册页面中，我们需要实现的几个功能：

1、输入注册用户名时，需要限制不允许输入特殊符号（其他限制自行考虑添加）；

2、input失去焦点，判断输入框是否为空，提示“用户名不能为空”；获得焦点后，提示信息先设为空；

3、input用户名失去焦点，使用axios查看数据库中是否存在该用户名？提示用户名已存在：提示用户名可用；

4、将input密码进行MD5密码加密运算，自行选择加密的运算方式；

Java实现MD5密码加密

5、点击注册按钮，将用户名和密码添加到数据库中。

注册功能的js代码：

<script>
        var pang = new Vue({
            el:"#app",
            data:{
                userName: '',
                userPassword: '',
                msg: '',

            },
            methods:{
                // 只能输入汉字、英文、数字
                // test1:function() {
                //     this.userName = this.userName.replace(/[^\a-\z\A-\Z0-9\u4E00-\u9FA5]/g, '')
                // },
                //只能输入英文、数字
                userPasswordLimit:function() {
                    this.userPassword = this.userPassword.replace(/[^\a-\z\A-\Z0-9]/g, '')
                },
                // 限制输入特殊字符
                userNameLimit:function() {
                    this.userName = this.userName.replace(/[ `~!@#$%^&*()_\-+=<>?:"{}|,.\/;'\\[\]·~！@#￥%……&*（）——\-+={}|《》？：“”【】、；‘’，。、]/g, '')
                },

                /**
                 * 失去焦点
                 * */
                blur:function () {
                    if (this.userName.length <= 0) {
                        pang.msg = '<span style="color: red">用户名不能为空</span>'
                    } else {
                        axios.post('/user/select',{
                            userName : this.userName,
                            headers: {'Content-Type': 'application/x-www-form-urlencoded'}   //跨域
                        }).then(function (dat){
                            if (dat.data == "0"){
                                pang.msg = '<span style="color: green">用户名可用</span>'
                            }
                            else if (dat.data == "1")
                                pang.msg = '<span style="color: red">用户名已存在</span>'
                        })
                    }
                },
                /**
                 * 获取焦点
                 * */
                focus:function () {
                    pang.msg = null
                },

                /**
                 * 点击注册按钮事件
                 * */
                register:function () {
                    if (this.userName.length <= 0) {
                        alert("用户名不能为空")
                    } else if(this.userPassword.length <= 0) {
                        alert("密码不能为空")
                    } else {
                        axios.post('/user/addUser', {
                            userName: this.userName,
                            userPassword: this.userPassword,
                            headers: {'Content-Type': 'application/x-www-form-urlencoded'}   //跨域
                        }).then(function (dat) {
                            if (dat.data == '1') {
                                window.location.href = '/user/successRegister'
                            }else {
                                alert("注册失败")
                            }

                        })
                    }

                }
            }
        })
    </script>

在登录页面中，只需判断输入的用户名和密码是否存在于数据库

在登录的时候，输入的密码也进行MD5加密，然后再与数据库中存储的数据是否相同

创建Login.html
<!DOCTYPE html>
<html lang="en" xmlns:v-on="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>用户登录</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">

    <style type="text/css">
        body {
            display:flex;
            height: 969px;
            align-items: center;
            padding:40px 0;
            background-color: #f5f5f5;
        }
        form {
            display: block;
            width: 100%;
            max-width: 330px;
            padding:15px;
            margin: auto;
        }
        .btn-block {
            width:300px;
            margin:10px auto;
        }
        .form-control {
            width:300px;
            height: 50px;
            font-size: 20px;
            margin:0 auto -20px;
            background-color: #fff;
        }


    </style>
</head>
<body class=text-center>
<!-- 点击登录之后，提交表单，验证该用户输入的账号密码是否正确 -->
    <form id = "app" >
        <img src="/img/P.png" width="72" height="72">
        <h2 class="=form-signin0-heading">Please sign in</h2>
        <input class="form-control" v-model="userName" type="text" placeholder="用户名" ><br>
        <input class="form-control" v-model="userPassword" type="password" placeholder="密码"><br>
        <button class="btn btn-lg btn-primary btn-block" type="button" @click="login" >Sign in</button>
        <button class="btn btn-lg btn-primary btn-block" type="button" @click="register" >Go to regist</button>
    </form>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        new Vue({
            el:'#app',
            data:{
                userName: '',
                userPassword: ''
            },
            methods:{
                login:function () {
                    axios.post('/user/selectUserName', {
                        userName: this.userName,
                        userPassword: this.userPassword,
                        headers: {'Content-Type': 'application/x-www-form-urlencoded'}   //跨域
                    }).then(function (dat) {
                        if (dat.data == '0')
                            alert("用户不存在")
                        else if (dat.data == '1')
                            alert("登录失败，账号或密码错误")
                        else if (dat.data == '2')
                        //当前窗体跳转
                            window.location.href = '/user/successLogin'
                        //新窗体跳转
                        // window.open('/user/successLogin')
                    }).catch(function () {
                        console.log("传输失败")
                    })
                },
                register:function () {
                    window.location.href = "user/register"
                }
            }
        })
    </script>

</body>
</html>
简单的注册成功界面还有登录成功界面的html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>成功注册</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <style>
        .btn-block {
            width:100px;
            margin:10px auto;
        }
    </style>
</head>
<body class="text-center">
    <div id="app">
        <h1>成功注册</h1>
        <button class="btn btn-lg btn-primary btn-block" @click="Login">前往登录</button>
    </div>

    <script>
        new Vue({
            el:'#app',
            data:{

            },
            methods:{
                Login:function () {
                    window.location.href = "/user/login"
                }
            }
        })
    </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>成功登录</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">

</head>
<body class="text-center">
    <h1 >成功登录</h1>
</body>
</html>
在提供后端代码前，先看一下poml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.pang</groupId>
    <artifactId>flower</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>flower</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
后端UserController.java
package com.pang.flower.Controller;

import com.pang.flower.Emtity.User;
import com.pang.flower.Mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;


@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    UserMapper userMapper;

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

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

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

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

    @ResponseBody
    @RequestMapping(value = "/select", method = RequestMethod.POST)
    public String select(@RequestBody User user) {
        System.out.println(user.getUserName());
        String result = userMapper.selectUserName(user.getUserName());
        System.out.println(result);
        if (result == null) {
            return "0";
        }
        return "1";
    }


    @ResponseBody
    @RequestMapping(value = "/selectUserName", method = RequestMethod.POST)
    public String selectUserName(@RequestBody User user) {
        String userName = user.getUserName();
        String userPassword = user.getUserPassword();
        System.out.println(userName + userPassword);

        String result = "-1";

        //将输入的密码加密
        String passwordMD5 = passwordMD5(userName, userPassword);

        //用户不存在
        if (userMapper.selectUserName(userName) == null) {
//            return "用户不存在";
            result = "0";
            return result;
            //用户存在，但密码输入错误
        }else
            if(!userMapper.selectUserPassword(userName).equals(passwordMD5) ){
            result = "1";
            return result;
//            return "账号或密码输入错误";
        }else if(userMapper.selectUserPassword(userName).equals(passwordMD5)) {
            result = "2";
//            return "成功登录";
            return result;
        }
        return result;
    }

    @ResponseBody
    @RequestMapping(value = "/addUser", method = RequestMethod.POST)
    public String addUser(@RequestBody User user) {
        String userName = user.getUserName();
        String userPassword = user.getUserPassword();
        System.out.println(userName + "***" + userPassword);
        String passwordMD5 = passwordMD5(userName, userPassword);
        userMapper.addUser(userName, passwordMD5);
        return "1";
    }

    public String passwordMD5(String userName, String userPassword) {
        // 需要加密的字符串
        String src = userName + userPassword;
        try {
            // 加密对象，指定加密方式
            MessageDigest md5 = MessageDigest.getInstance("md5");
            // 准备要加密的数据
            byte[] b = src.getBytes();
            // 加密：MD5加密一种被广泛使用的密码散列函数，
            // 可以产生出一个128位（16字节）的散列值（hash value），用于确保信息传输完整一致
            byte[] digest = md5.digest(b);
            // 十六进制的字符
            char[] chars = new char[]{'0', '1', '2', '3', '4', '5',
                    '6', '7', 'A', 'B', 'C', 'd', 'o', '*', '#', '/'};
            StringBuffer sb = new StringBuffer();
            // 处理成十六进制的字符串(通常)
            // 遍历加密后的密码，将每个元素向右位移4位，然后与15进行与运算(byte变成数字)
            for (byte bb : digest) {
                sb.append(chars[(bb >> 4) & 15]);
                sb.append(chars[bb & 15]);
            }
            // 打印加密后的字符串
            System.out.println(sb);
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }
}
实体类User.java
package com.pang.flower.Emtity;

public class User {
    private String userName;
    private String userPassword;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPassword() {
        return userPassword;
    }

    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }
}
映射Mapper.java
package com.pang.flower.Mapper;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserMapper {

    @Select("select userName from user where userName = #{userName}")
    public String selectUserName(String userName);

    @Select("select userPassword from user where userName = #{userName}")
    public String selectUserPassword(String userName);

    @Insert("insert into user(userName, userPassword) values(#{userName}, #{userPassword})")
    public void addUser(String userName, String userPassword);
}
界面展示

在这里插入图片描述

在这里插入图片描述

数据库界面

在这里插入图片描述

代码部分已经提供的很详细了哦，如果觉得我哪里讲的不清楚的可以评论或者私信我哦

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