javax.activation.UnsupportedDataTypeException：无对象DCH for MIME类型multipart / mixed;边界 [英] javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; boundary

问题描述

目前我正在编写一个正在监听目录的代码。当目录用.apk文件更新时，我将使用此.apk文件发送邮件到Gmail帐户。我在我的程序中使用Jnotify和JAVA Mail。

我得到的错误是，

  javax.mail.MessagingException：IOException同时发送消息; 
嵌套异常是：
 javax.activation.UnsupportedDataTypeException：没有对象DCH for MIME类型multipart / mixed; border =---- = _ Part_0_145238.1392728439484
  

我寻找在stackoverflow中给出的解决方案帮助，但没有一个有帮助。

感谢提前

  public void fileCreated（int wd，String rootPath，String name）{
 print（created+ rootPath +：+ name）; 
 
 if（name.contains（。apk））
 SendEmail（name）; 
 else 
 System.out.println（不是APK文件）; 
} 
 
 void SendEmail（String strname）{
 String Path =D：/ POC / Email / apk folder /+ strname; 
 System.out.println（Path->+ Path）; 
 
属性props = new Properties（）; 
 props.put（mail.smtp.host，173.194.78.108）; 
 props.put（mail.smtp.socketFactory.port，465）; 
 props.put（mail.smtp.socketFactory.class，javax.net.ssl.SSLSocketFactory）; 
 props.put（mail.smtp.auth，true）; 
 props.put（mail.smtp.port，465）; 
 
 System.out.println（属性已正确设置）; 
 
会话session = Session.getDefaultInstance（props，
 new javax.mail.Authenticator（）{
 protected PasswordAuthentication getPasswordAuthentication（）{
返回新的PasswordAuthentication（SenderEmailID @ gmail.com，senderPassword）; 
} 
} 
）; 
 
 System.out.println（会话创建成功）; 
 
 try {
 Message message = new MimeMessage（session）; 
 message.setFrom（new InternetAddress（[e-mail]））; 
 message.setRecipients（Message.RecipientType.TO，InternetAddress.parse（[e-mail]））; 
 message.setSubject（Android：+ strname）; 
 
 MimeBodyPart msgbody = new MimeBodyPart（）; 
 msgbody.setText（这是使用JAVA MAIL 1.4.5发送的消息内容）; 
 Multipart mulpart = new MimeMultipart（）; 
 mulpart.addBodyPart（msgbody）; 
 
 // Attachement从这里开始。 
 msgbody = new MimeBodyPart（）; 
 javax.activation.DataSource source = new FileDataSource（Path）; 
 msgbody.setDataHandler（new DataHandler（source））; 
 msgbody.setFileName（strname）; 
 message.setContent（mulpart）; 
 
 System.out.println（附加邮件开始运送邮件）; 
 
 //如果我发送电子邮件之前已经发送但没有附件的代码。 
 //Thread.currentThread（）。setContextClassLoader（getClass（）。getClassLoader（））; 
 
 Transport.send（message）; 
 System.out.println（Mail sent successfully）; 
} 
 catch（MessagingException msg）{
 msg.printStackTrace（）; 
} 
 catch（异常e）{
 e.printStackTrace（）; 
} 
} 
  

解决方案

问题可以通过以下两个步骤获得解决方案。

1. 确保java邮件是1.4.7（Previosly我用了1.4。 5导致了所有的混乱）。从 http://www.oracle.com/technetwork/java/index-138643.html


2. 发送消息之前添加这段代码
   Thread.currentThread（）。setContextClassLoader（getClass（）。getClassLoader（））;

Currently I'm inline of writing a code that will be listening to a directory. when the directory is updated with .apk file, I'll send a mail with this .apk file to a gmail account. I'm using Jnotify and JAVA Mail in my program.

The Error I'm getting is,

javax.mail.MessagingException: IOException while sending message;
  nested exception is:
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; boundary="----=_Part_0_145238.1392728439484"

I looked for the solutions given in the stackoverflow for help but none of them where helpful.

Thanks in Advance

public void fileCreated(int wd, String rootPath, String name) {
    print("created " + rootPath + " : " + name);

    if (name.contains(".apk"))
      SendEmail(name);
    else
        System.out.println("Not the APK file");
}

void SendEmail(String strname){
    String Path = "D:/POC/Email/apk folder/"+strname;
    System.out.println("Path->" + Path);

    Properties props = new Properties();
    props.put("mail.smtp.host","173.194.78.108");
    props.put("mail.smtp.socketFactory.port", "465");
    props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth","true");
    props.put("mail.smtp.port","465");

    System.out.println("Properties has been set properly");

    Session session = Session.getDefaultInstance(props,
        new javax.mail.Authenticator(){
            protected PasswordAuthentication getPasswordAuthentication(){
                return new PasswordAuthentication("[e-mail]", "senderPassword");
            }
        }
    );

    System.out.println("Session Created successfully");

    try{
        Message message = new MimeMessage(session); 
        message.setFrom(new InternetAddress("[e-mail]"));
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("[e-mail]"));
        message.setSubject("Android : " + strname);

        MimeBodyPart msgbody = new MimeBodyPart();
        msgbody.setText("This is the message content which is sent using JAVA MAIL 1.4.5");
        Multipart mulpart = new MimeMultipart();
        mulpart.addBodyPart(msgbody);

        //Attachement Starts here.
        msgbody = new MimeBodyPart();
        javax.activation.DataSource source = new FileDataSource(Path);
        msgbody.setDataHandler(new DataHandler(source));
        msgbody.setFileName(strname);
        message.setContent(mulpart);

        System.out.println("Attached the message going to start transporting the mail");

        //If I've the code before sending the email is getting sent but without attachment. 
        //Thread.currentThread().setContextClassLoader( getClass().getClassLoader() );

        Transport.send(message);
        System.out.println("Mail Sent successfully");
    }
    catch(MessagingException msg){
        msg.printStackTrace();
    }
    catch(Exception e){
        e.printStackTrace();
    }
}

解决方案

This issue can get a solution by taking up the below two steps.

1. Make sure java mail is 1.4.7.(Previosly I used 1.4.5 which led to all confusions). Download it from http://www.oracle.com/technetwork/java/index-138643.html
2. Add this piece of code before sending the message, Thread.currentThread().setContextClassLoader( getClass().getClassLoader() );

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