-----------------------------------------------配置文件里mail的配置信息------------------------------------------
mail.host = 192.168.1.1
mail.username = wang
mail.password = 12345
mail.from = 邮箱地址@qq.com

------------------------------------------------java 最外层-----------------------------------------------------

@Value("#{'${mail.host:''}'}")
	private String MAIL_HOST;
	@Value("#{'${mail.username:''}'}")
	private String MAIL_USER_NAME;
	@Value("#{'${mail.password:''}'}")
	private String MAIL_PASSWORD;
	@Value("#{'${mail.from:''}'}")
	private String MAIL_FROM;



  -------------------------------------java调用--------------------------------------------------------------------



  sendMailFile(发送给谁的邮件地址@qq.com, cc抄送给谁,title标题 , 邮件内容msg,实体类declstateList);


  -------------------------------------java方法--------------------------------------------------------------------
  public void sendMailFile(String to, String cc, String subject, String content,DeclstateList declstateList)
			throws AddressException, MessagingException {
		Properties properties = new Properties();
		properties.setProperty("mail.smtp.auth", "true");// 服务器需要认证
		properties.setProperty("mail.transport.protocol", "smtp");// 声明发送邮件使用的端口
		properties.setProperty("mail.host", MAIL_HOST);// 发送邮件的服务器地址

		Session session = Session.getInstance(properties, new Authenticator() {
			protected PasswordAuthentication getPasswordAuthentication() {
				return new PasswordAuthentication(MAIL_USER_NAME, MAIL_PASSWORD);
			}
		});
		session.setDebug(true);// 在后台打印发送邮件的实时信息

		Message message = new MimeMessage(session);
		message.setFrom(new InternetAddress(MAIL_FROM));
		message.setSubject(subject);// 设置主题
		message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));// 发送

		// 向multipart对象中添加邮件的各个部分内容，包括文本内容和附件
        Multipart multipart = new MimeMultipart();
		 // 添加邮件正文
        BodyPart contentPart = new MimeBodyPart();
        contentPart.setContent(content, "text/html;charset=UTF-8");
        multipart.addBodyPart(contentPart);

      //判断服务器的系统
		String osName = System.getProperty("os.name");
		String path = "";
		if (osName == null)
			osName = "";
		if (osName.toLowerCase().indexOf("win") != -1){
			path = "C:/test1/declstateList/"+declstateList.getId();
		}else{
			 path = "/opt/declstateList/"+declstateList.getId();
		}

		File filePath = new File(path);//File类型可以是文件也可以是文件夹
		if(!filePath.exists()){
			filePath.mkdirs();
		}

		File[] fileList = filePath.listFiles();//将该目录下的所有文件放置在一个File类型的数组中

		for (int i = 0; i < fileList.length; i++) {
			File file = fileList[i];

			//添加附件的内容
	        if (file != null) {
	            BodyPart attachmentBodyPart = new MimeBodyPart();
	            DataSource source = new FileDataSource(file);
	            attachmentBodyPart.setDataHandler(new DataHandler(source));

	            // 网上流传的解决文件名乱码的方法，其实用MimeUtility.encodeWord就可以很方便的搞定
	            // 这里很重要，通过下面的Base64编码的转换可以保证你的中文附件标题名在发送时不会变成乱码
	            //sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
	            //messageBodyPart.setFileName("=?GBK?B?" + enc.encode(attachment.getName().getBytes()) + "?=");

	            //MimeUtility.encodeWord可以避免文件名乱码
	            try {
					attachmentBodyPart.setFileName(MimeUtility.encodeWord(file.getName()));
				} catch (UnsupportedEncodingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
	            multipart.addBodyPart(attachmentBodyPart);
	        }
		}
        // 将multipart对象放到message中
        message.setContent(multipart);
        // 保存邮件
        message.saveChanges();
		Transport.send(message);// 发送邮件
	}