使用IDEA创建SpringBoot+MyBatis+MySql项目实现登录注册功能

一、搭建SpringBoot项目

1.1、file ——> new ——> project——> Spring Initializr——> next——> next——> next——> finish

注意选择包依赖关系
Web下的Spring Web。
Template Engines下的Thymeleaf。
SQL下的JDBC API、Spring Data JDBC、MySQL Driver。

二、springboot整合mybatis、mysql

2.1、整体结构

2.2、设置所需要的依赖

即pom.xml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>2.4.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>springboot-web04</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</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-data-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
<!--下面的都是我加的-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</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>2.1.3</version>
            </dependency>

            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>

            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.12</version>
                <scope>provided</scope>
            </dependency>

            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.2.1</version>
            </dependency>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.xmlunit</groupId>
                <artifactId>xmlunit-core</artifactId>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.4.6</version>
            </dependency>
    </dependencies>

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

</project>

2.3、设置application.yml文件与pplication.properties文件

在resources目录下新建yml文件，用于存放数据库连接需要的一些数据

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8&useSSL=true
    username: root   #数据库
    password: sm1208 #密码

在application.properties文件中加入

#端口号
server.port=8080
#druid数据库连接池
type=com.alibaba.druid.pool.DruidDataSource
#清除缓存
spring.thymeleaf.cache=false
#配置mapper
mybatis.mapper-locations=classpath:mapper/*.xml

2.4、在pojo下的新建类UserLogin

package springbootweb04.demo.pojo;

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

@Data
@AllArgsConstructor
@NoArgsConstructor

public class UserLogin {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }
}

2.5、新建数据库，名为mybatis，创建用户表，名为userLogin，创建username、password字段

2.5.1、数据库名可以随意，不过要与application.yml文件中的一致

2.5.2、IDEA中连接数据库

Database——> +——> Data Source——> Mysql

2.6、mapper层

新建UserLoginMapper接口

package springbootweb04.demo.mapper;

import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import springbootweb04.demo.pojo.UserLogin;

import java.util.List;

@Mapper
@Repository
public interface UserLoginMapper {
    //查询
    public List<UserLogin> queryAll();
    //添加数据
    public int add(UserLogin userLogin);
    //根据用户名查询数据
    public UserLogin queryByName(String username);
}

2.7、resources目录下的mapper目录

在resources目录下新建mapper目录，并在这个目录下新建UserLoginMapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="springbootweb04.demo.mapper.UserLoginMapper">
    <select id="queryAll" resultType="springbootweb04.demo.pojo.UserLogin">
        select * from userLogin
    </select>

    <insert id="add" parameterType="springbootweb04.demo.pojo.UserLogin">
        insert into userLogin values (#{username},#{password})
    </insert>

    <select id="queryByName" resultType="springbootweb04.demo.pojo.UserLogin">
        select * from userLogin where username = #{username}
    </select>

</mapper>

2.8、测试

在test.Java.springbootweb04.demo类中，测试是否能联通数据库，没有报错说明成功。

package springbootweb04.demo;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import springbootweb04.demo.mapper.UserLoginMapper;
import springbootweb04.demo.pojo.UserLogin;
import org.springframework.beans.factory.annotation.Autowired;


import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

@SpringBootTest
class DemoApplicationTests {
    @Autowired
    DataSource dataSource;
    @Test
    void contextLoads() throws SQLException {
        System.out.println(dataSource.getClass());
        Connection connection = dataSource.getConnection();
        System.out.println(connection);

        //template模板，拿来即用
        connection.close();
    }
    @Autowired
    UserLoginMapper userLoginMapper;
    @Test
    public void toTest(){
        List<UserLogin> userLogins = userLoginMapper.queryAll();
        userLogins.forEach(e-> System.out.println(e));
    }
}

2.9、services层

在services下新建接口UserLoginServicesI和类UserLoginServicesImpl

UserLoginServicesI接口：

package springbootweb04.demo.services;

import springbootweb04.demo.pojo.UserLogin;

import java.util.List;

public interface UserLoginServicesI {
    //查询
    public List<UserLogin> queryAll();
    //添加数据
    public int add(UserLogin userLogin);
    //根据用户名查询数据
    public UserLogin queryByName(String username);
}

UserLoginServicesImpl类

package springbootweb04.demo.services;

import springbootweb04.demo.mapper.UserLoginMapper;
import springbootweb04.demo.pojo.UserLogin;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserLoginServicesImpl implements UserLoginServicesI {

    @Autowired
    UserLoginMapper userLoginMapper;
    @Override
    public List<UserLogin> queryAll() {
        return userLoginMapper.queryAll();
    }

    @Override
    public int add(UserLogin userLogin) {
        return userLoginMapper.add(userLogin);
    }

    @Override
    public UserLogin queryByName(String username) {
        return userLoginMapper.queryByName(username);
    }
}

2.10、controller层

编写MyController类

package springbootweb04.demo.controller;

import springbootweb04.demo.pojo.UserLogin;
import springbootweb04.demo.services.UserLoginServicesImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {
    @Autowired
    UserLoginServicesImpl userLoginServicesImpl;

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

    @RequestMapping("/LoginSuccess")
    public String LoginSuccess(Model model, UserLogin userLogin){
        //先查询看该用户名是否存在
        UserLogin userLogin1 = userLoginServicesImpl.queryByName(userLogin.getUsername());
        if(userLogin1 != null){ //  如果查询的用户不为空
            System.out.println(userLogin1.toString());
            return "success";
        }
        else{
            //返回到登录页面
            model.addAttribute("data","该用户不存在，请先注册");
            return "login";
        }
    }
    //登录界面
    @RequestMapping("/toRegister")
    public String toRegister(){
        return "register";
    }
    @RequestMapping("/RegisterSuccess")
    public String toRegisterSuccess(Model model,UserLogin userLogin){
        //将账号密码加入到数据库中
        int add = userLoginServicesImpl.add(userLogin);
        System.out.println("数据插入成功！");
        model.addAttribute("data","注册成功，请登录！");
        return "login";
    }
}

三、编写前端页面

将以下三个页面放在templates下面

login.html：登录页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body style="background: aqua">
<div align="center">
    <br><br><h2>登录界面</h2><br><br>
    <span th:text="${data}" style="text-color:red;font-size: 10px"></span>
    <form method="get" action="/LoginSuccess">
        用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br>
        密码：<input type="text" name="password" placeholder="请输入密码" required/><br><br>
        <input type="submit" value="登录">
    </form>
    <br>
    <form method="get" action="/toRegister">
        <input type="submit" value="注册">
    </form>
</div>
</body>
</html>

register.html:注册页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body style="background: aqua">
<div align="center">
    <br><br>注册界面<br><br>
    <form method="get" action="/RegisterSuccess">
        用户名:<input type="text" name="username" placeholder="请输入用户名" required/><br><br>
        密码：<input type="text" name="password" placeholder="请输入密码" required/><br><br>
        确认密码：<input type="text" name="password2" placeholder="请输入密码" required/><br><br>
        <input type="submit" value="注册">
    </form>
</div>
</body>
</html>

success.html：成功界面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>

四、运行测试

:localhost:8080/toLogin