1. 添加依赖

<!-- mail依赖 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-mail</artifactId>
		</dependency>

2.yml文件添加mail配置

mail:
    host: 
    username: 
    password: 
    default-encoding: utf-8

3.

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

    @Autowired
    private JavaMailSender sender;

    /**
     * @Description //TODO 发送简单邮件
    
     * @return void
     **/
    public void sendEmail(String[] to, String title, String content){
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from); //发送者
        message.setTo(to); //接受者
        message.setSubject(title); //发送标题
        message.setText(content);  //发送内容
        //sender.send(message);

    }
    /**
     * @Description //TODO 发送html格式内容的邮件
     * 
     * @return void
     **/
    @Async //异步调用这个方法
    public void sendInlineMail(String[] to, String title, String content) throws Exception {
        MimeMessage mimeMessage = sender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
        helper.setFrom(from);
        helper.setTo(to);
        helper.setSubject(title);
        helper.setText(content, true); //注意:调用setText时需要在第二个参数传入true,这样才会使用HTML格式发送邮件
        sender.send(mimeMessage);
    }
    
    
}

如果使用@Async //异步调用这个方法异步;在启动类添加注解:@EnableAsync