1.QQ邮箱开启服务 获取授权码

 2.在配置文件进行相关配置

spring:
  mail:
    host: smtp.qq.com
    port: 587
    username: xxx
    password: xxx
    default-encoding: utf-8
    properties:
      mail:
        smtp:
          connectiontimeout: 5000
          timeout: 3000
          writetimeout: 5000

3.读取配置类

/**
 * 读取yml配置文件里面的信息
 */
@Configuration
@ConfigurationProperties(prefix = "spring.mail")
@Data
public class MailConfig {
    private String username;
}

4.emalDto类

@Data
@AllArgsConstructor
@NoArgsConstructor
public
class EmailDto {

    /**
     * 接收邮箱
     */
    private String toEmali;

    /**
     * 主题
     */
    private String subject;

    /**
     * 内容
     */
    private String content;

}

5.在service里面添加接口 

public interface EmailService {

    /**
     * 发送邮件
     *
     * @param emailDto 邮箱列表
     */
    boolean send(EmailDto emailDto);

}

6.实现Service

@Slf4j
@Service
@RequiredArgsConstructor
public class EmailServiceImpl implements EmailService {
    @Autowired
    private MailConfig mailConfig;
    @Resource
    private JavaMailSenderImpl mailSender;

    @Override
    public boolean send(EmailDto emailDto) {
        String fromEmail = mailConfig.getUsername();

        //定制纯文本邮件信息SimpleMailMessage
        SimpleMailMessage message = new SimpleMailMessage();
        try {
            //设置发件箱
            message.setFrom(fromEmail);
            //设置收件箱
            message.setTo(emailDto.getToEmali());
            //设置邮件主题
            message.setSubject(emailDto.getSubject());
            //设置邮件内容
            message.setText(emailDto.getContent());
            //调用Java封装好的发送方法
            mailSender.send(message);
            return true;
        } catch (Exception e) {
            System.out.println("邮件发送失败，原因：" + e.getMessage());
            return false;
        }

    }
}

 7.测试

    public void send(){
        EmailDto emailDto = new EmailDto();
        emailDto.setToEmali("xxx@qq.com");
        emailDto.setSubject("验证码");
        emailDto.setContent("145615");
        emailService.send(emailDto);
    }