<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-mail</artifactId>
 </dependency>
 <dependency>
   <groupId>com.google.guava</groupId>
   <artifactId>guava</artifactId>
   <version>23.0</version>
  </dependency>
  <dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
  </dependency>

spring.mail.host=smtp.mail.me.com //郵箱發(fā)送服務器
spring.mail.port=587//服務器端口
spring.mail.username=xxx6666@icloud.com//發(fā)件人郵箱
spring.mail.password=password//客戶端專用密碼
//如果和我一樣使用的icloud郵箱 還需要下列兩個配置，別的有的郵箱不需要
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

@Configuration
public class AsyncEventBusConfig {
 //實例化bean，采用單例形式注入容器
 @Bean
 @Scope("singleton")
 public AsyncEventBus asyncEventBus(){
  //創(chuàng)建線程池對象
  final ThreadPoolExecutor executor=executor();
  return new AsyncEventBus(executor);
 }
 //創(chuàng)建線程池方法
 private ThreadPoolExecutor executor(){
  return new
    ThreadPoolExecutor(2,
    2,0L,
    TimeUnit.MICROSECONDS,
    new LinkedBlockingQueue<>());
 }
}

@Service
public class EmailService {

 @Autowired
 private JavaMailSender javaMailSender;

 /**
  * 發(fā)件人。這里發(fā)件人一般是同使用的發(fā)件郵箱一致
  */
 @Value("${spring.mail.username}")
 private String from;


 /**
  * 發(fā)送文本郵件
  * @param to 收件人郵箱地址
  * @param subject 主題
  * @param content 內(nèi)容
  */
 public void sendTextMail(String to,
        String subject,
        String content) {
  SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
  simpleMailMessage.setTo(to);
  simpleMailMessage.setSubject(subject);
  simpleMailMessage.setText(content);
  simpleMailMessage.setFrom(from);
  javaMailSender.send(simpleMailMessage);
 }


 /**
  * 發(fā)送html內(nèi)容的郵件
  * @param to 收件人
  * @param htmlContent html內(nèi)容
  * @param subject 主題
  * @throws MessagingException
  */
 public void sendHtmlMail(String to,
        String htmlContent,
        String subject) throws MessagingException {
  MimeMessage message = javaMailSender.createMimeMessage();
  MimeMessageHelper messageHelper = new MimeMessageHelper(message, true);
  messageHelper.setTo(to);
  messageHelper.setSubject(subject);
  messageHelper.setFrom(from);
  messageHelper.setText(htmlContent, true);
  javaMailSender.send(message);
 }

 /**
  * 發(fā)送圖文郵件
  * @param to 收件人
  * @param imgContent 圖文內(nèi)容
  * @param subject 主題
  * @param rscId 資源id
  * @param imgPath 資源路徑
  * @throws MessagingException
  */
 public void sendImgMail(String to,
       String imgContent,
       String subject,
       String rscId,
       String imgPath) throws MessagingException {
  MimeMessage message = javaMailSender.createMimeMessage();
  MimeMessageHelper messageHelper = new MimeMessageHelper(message, true);
  messageHelper.setTo(to);
  messageHelper.setSubject(subject);
  messageHelper.setFrom(from);
  messageHelper.setText(imgContent, true);
  messageHelper.addInline(rscId, new File(imgPath));
  javaMailSender.send(message);
 }
}

@Service
public class EventBusListener {

 /**
  * 引入bean
  */
 @Autowired
 private AsyncEventBus asyncEventBus;

 @Autowired
 private EmailService emailService;

 /**
  * 注冊服務類
  */
 @PostConstruct
 public void init(){
  asyncEventBus.register(this);
 }

 /**
  * 線程安全，消費 文本消息
  * @param textEmailDTO
  */
 @AllowConcurrentEvents
 @Subscribe
 public void sendTextMail(TextEmailDTO textEmailDTO){
  emailService.sendTextMail(
    textEmailDTO.getTo(),
    textEmailDTO.getSubject(),
    textEmailDTO.getContent()
  );
 }

 /**
  * 線程安全 消費 html消息
  * @param htmlEmailDTO
  */
 @AllowConcurrentEvents
 @Subscribe
 public void sendHtmlMail(HtmlEmailDTO htmlEmailDTO){
  try {
   emailService.sendHtmlMail(
     htmlEmailDTO.getTo(),
     htmlEmailDTO.getHtmlContent(),
     htmlEmailDTO.getSubject()
   );
  } catch (MessagingException e) {
   // nothing to do
  }
 }

 /**
  * 線程安全 消費 圖文消息
  * @param imgEmailDTO
  */
 @AllowConcurrentEvents
 @Subscribe
 public void sendImgMail(ImgEmailDTO imgEmailDTO){
  try {
   emailService.sendImgMail(
     imgEmailDTO.getTo(),
     imgEmailDTO.getImgContent(),
     imgEmailDTO.getSubject(),
     imgEmailDTO.getRscId(),
     imgEmailDTO.getImgPath()
   );
  } catch (MessagingException e) {
   // nothing to do
  }
 }
}

@Data
public class ImgEmailDTO implements Serializable {
 public ImgEmailDTO() {
 }

 /**
  * 圖片路徑
  */
 private String imgPath;

 /**
  * 資源id
  */
 private String rscId;

 /**
  * 主題
  */
 private String subject;

 /**
  * 圖片正文（同樣可以使用html）
  */
 private String imgContent;

 /**
  * 收件人
  */
 private String to;
}

 /**
  * 發(fā)送圖文郵件
  * @param request
  * @return
  */
 @RequestMapping(value = "/sendImgMail", method = RequestMethod.POST)
 public Result<Integer> sendImgMail(@RequestBody Request<ImgEmailDTO> request) {
  Result<Integer> result = Result.create();
  ImgEmailDTO imgEmailDTO=request.getData();
  StringBuilder sb=new StringBuilder();
  sb.append(imgEmailDTO.getImgContent());
  //cid:資源id。在spring中會自動綁定
  sb.append("<img src=\'cid:").append(imgEmailDTO.getRscId()).append("\'></img>");
  imgEmailDTO.setImgContent(sb.toString());
  asyncEventBus.post(imgEmailDTO);
  return result.success(1);
 }