SpringBoot+JMail

1.导入jar
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-mail -->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-mail</artifactId>
   <version>2.1.6.RELEASE</version>
</dependency>

2.SpringBoot配置
spring.mail.host=smtp.qq.com
spring.mail.username=发送邮箱
spring.mail.password=cutkvuqshjgobbcj
spring.mail.protocol=smtp
spring.mail.default-encoding=UTF-8

3.编码
public class MailUtil {

    @Autowired
    JavaMailSenderImpl mailSender;

    public void sendEmail(HashMap map) throws  Exception{
        //创建一个复杂的消息邮件
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);
        helper.setSubject((String) map.get("subject"));//邮件主题
        helper.setText((String) map.get("text"),true);//使用html，邮件内容
        helper.setTo((String) map.get("to"));//收件地址
        helper.setFrom((String) map.get("from"));//发件人
        String filePath = (String) map.get("file");//附件路径
        if(!StringUtils.isEmpty(filePath)){
            FileSystemResource fileSystemResource = new FileSystemResource(filePath);
            helper.addAttachment((String) map.get("newName"), fileSystemResource);
        }
        mailSender.send(mimeMessage);
    }
}