导入依赖

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<!-- springboot 邮件支持 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

ymal配置

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spring:
	mail:
        host: ${MAIL_HOST:smtp.qq.com}
        port: ${MAIL_port:465}
        protocol: ${MAIL_PROTOCOL:smtps}
        default-encoding: UTF-8
        username: ${MAIL_USERNAME:xxx@qq.com}
        password: ${MAIL_PASSWORD:}

邮件发送服务类

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@Service
public class MailUtil {
    @Value("${spring.mail.username}")
    private String from;

    @Autowired
    private JavaMailSender mailSender;

    public void sendMail(String to, String subject, String body) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from);
        message.setTo(to);
        message.setSubject(subject);
        message.setText(body);
        mailSender.send(message);
    }
}