@RestController
@RequestMapping("email")

public class EmailController {
    //	引入邮件接口
    @Autowired
    private JavaMailSender mailSender;

    //	获得发件人信息
    @Value("${spring.mail.username}")
    private String from;
    @RequestMapping("sendEmail")
    public R commonEmail(ToEmail toEmail) {
//        创建邮件消息
        SimpleMailMessage message = new SimpleMailMessage();

        message.setFrom(from);
        message.setTo(toEmail.getTos());
        message.setSubject("您本次的验证码是");

        int verCode = ValidateCodeUtils.generateValidateCode(4);

        message.setText("尊敬的xxx,您好:\n"
                + "\n本次请求的邮件验证码为:" + verCode + ",本验证码 5 分钟内效，请及时输入。（请勿泄露此验证码）\n"
                + "\n如非本人操作，请忽略该邮件。\n(这是一封通过自动发送的邮件，请不要直接回复）");

        mailSender.send(message);
        return R.ok("发送成功");
    }
}

实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class ToEmail implements Serializable {

    //    邮件接收方
    private String[] tos;
    //    邮件主题
    private String subject;
    //    邮件内容
    private String content;
}

需要添加maven依赖

<!-- 邮箱验证码依赖 -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-mail</artifactId>
</dependency>

需要配置yml文件

spring:
  #邮箱验证码配置
  mail:
    #smtp服务主机  qq邮箱则为smtp.qq.com;163邮箱是smtp.163.com
    host: smtp.qq.com
    #服务协议
    protocol: smtp
    # 编码集
    default-encoding: UTF-8
    #发送邮件的账户
    username: xxxxxxxxxxxxxx@qq.com
    #授权码
    password: xxxxxxxxxxxxxx
    test-connection: true
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
            required: true