一、前提准备

1、在qq邮箱中打开POP3/SMTP服务

步骤：点击qq邮箱--->设置--->账户--->向下滑找到POP3/SMTP服务--->开启并用手机发送验证码

--->发送后请记住你的授权码（后续在配置中会写入）

2、创建数据库

创建一个名为mvc的库和一个名为user的表，其中id字段为主键并自动增长

 二、创建Maven工程 1、项目目录结构

2、依赖和配置

pom.xml:

        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
            mysql
            mysql-connector-java
            8.0.21
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.4.1
        
        
            mysql
            mysql-connector-java
            8.0.21
        
        
            org.springframework.boot
            spring-boot-starter-mail
        
    

注：数据库导入自己的版本，spring-boot-starter-mail如果导入失败可以加入版本号

2.1.1.RELEASE

application.properties：

server.port=8080
spring.datasource.url=jdbc:mysql://127.0.0.1/mvc?useSSL=false&serverTimezone=UTC&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#与数据库交流日志
logging.level.com.example.demo.dao=debug
#邮箱配置
#平台地址，这里用的是qq邮箱，使用其他邮箱请更换
spring.mail.host = smtp.qq.com
#改成自己的邮箱
spring.mail.username = 123@qq.com
#发送短信后它给你的授权码 填写到这里
spring.mail.password = 123
#这东西不用改
spring.mail.properties.mail.smtp.ssl.enable=true
##编码格式
spring.mail.default-encoding=UTF-8

3、完整代码

1、UserController

@Controller
public class UserController {

    @Autowired
    private MailService mailService;

    @PostMapping("/sendEmail")
    @ResponseBody
    public String sendEmail(String email, HttpSession httpSession){
        mailService.sendMimeMail(email, httpSession);
        return "sucess";
    }

    @PostMapping("/regist")
    @ResponseBody
    public String regist(UserVo userVo, HttpSession session){
        System.out.println(mailService.registered(userVo, session));
        return "sucess";
    }

    @PostMapping("/login")
    @ResponseBody
    public String login(String email, String password){
        mailService.loginIn(email,password);
        return "sucess";
    }

    @RequestMapping("/se")
    public String se(){
        return "sendEmail";
    }
    @RequestMapping("/rg")
    public String rg(){
        return "regist";
    }
    @RequestMapping("/LG")
    public String lg(){
        return "lg";
    }
}

2、UserMapper

@Mapper
public interface UserMapper extends BaseMapper {

}

3、User

@Data
@TableName("user")
public class User {
    @TableId(type = IdType.AUTO)
    private Integer id;
    private String username;
    private String password;
    private String email;

}

4、UserVo

@Data
public class UserVo {
    private String username;

    private String password;

    private String email;
    
    private String code;

 }

5、UserServiceImpl

@Service
public class UserServiceImpl extends ServiceImpl
        implements UserService {

}

6、MailService

@Service
public class MailService {
    @Autowired
    private JavaMailSender mailSender;

    @Autowired
    private UserService userService;

    //application.properties中已配置的值
    @Value("${spring.mail.username}")
    private String from;


    public boolean sendMimeMail( String email, HttpSession session) {
        try {
            SimpleMailMessage mailMessage = new SimpleMailMessage();

            mailMessage.setSubject("验证码邮件");
            
            String code = randomCode();

            session.setAttribute("email",email);
            session.setAttribute("code",code);

            mailMessage.setText("您收到的验证码是："+code);

            mailMessage.setTo(email);

            mailMessage.setFrom(from);

            mailSender.send(mailMessage);
            return  true;
        }catch (Exception e){
            e.printStackTrace();
            return false;
        }
    }


    public String randomCode(){
        StringBuilder str = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 6; i++) {
            str.append(random.nextInt(10));
        }
        return str.toString();
    }

    public boolean registered(UserVo userVo, HttpSession session){
        
        String email = (String) session.getAttribute("email");
        String code = (String) session.getAttribute("code");

        String voCode = userVo.getCode();

        if (email == null || email.isEmpty()){
            return false;
        }else if (!code.equals(voCode)){
            return false;
        }
        User user=new User();
        user.setUsername(userVo.getUsername());
        user.setPassword(userVo.getPassword());
        user.setEmail(userVo.getEmail());
        userService.save(user);
        return true;
    }


    public boolean loginIn(String email, String password){

        QueryWrapper queryWrapper=new QueryWrapper<>();
        queryWrapper.eq("email",email);
        User user=userService.getOne(queryWrapper);
        if(user==null){
            return false;
        }

        if(!user.getPassword().equals(password)){
            return false;
        }
        System.out.println("登录成功:数据库密码是："+user.getPassword());
        return true;
    }
}

7、UserService

public interface UserService extends IService {

}

8、regist.html

    
    



    
        username: 


    
    
        password: 
    
    
        email: 
    
    
        code: 
    
    
    
        
    

9、sendEmail

10、lg.html

    
    



    
        email: 
    
    
        password: 
    
    
        
    

三、测试

1、 发送邮件功能

输入自己的邮箱并提交，得到邮箱验证信息

2、注册

输入刚得到的验证码并填写信息，成功后数据库中便新增信息

3、登录

输入数据库的邮箱和密码，正确即登录成功 

注：不能重复注册同一账号多次，不然会登录失败