在java中发送消息时是否有MessagingExceptionIOException？ [英] MessagingExceptionIOException while sending message in java?

问题描述

我使用以下代码发送mail.Text消息发送工作正常但邮件附件无法正常工作它给Exception.How解决这个问题

I use the following code to send mail.Text message sending is working fine but Mail with attachment is not working it gives the Exception.How to solve this

javax.mail.MessagingException：发送消息时发生IOException;
嵌套异常是：
javax.activation.UnsupportedDataTypeException：没有MIME类型multipart / mixed的对象DCH;
boundary =---- = _ Part_0_10430987.1294298904906
at com.sun.mail.smtp.SMTPTransport.sendMessage（SMTPTransport.java:676）
at javax.mail.Transport。 send0（Transport.java:189）
at javax.mail.Transport.send（Transport.java:118)
at Gmailer.GMailSender.sendMailAttach（GMailSender.java:114）
at SendMail .main（SendMail.java:22）
引起：javax.activation.UnsupportedDataTypeException：没有MIME类型multipart / mixed的对象DCH;
boundary =---- = _ Part_0_10430987.1294298904906
at javax.activation.ObjectDataContentHandler.writeTo（Unknown Source）
at javax.activation.DataHandler.writeTo（Unknown Source）
at javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1403）
at javax.mail.internet.MimeMessage.writeTo（MimeMessage.java:1745）
at com.sun.mail .smtp.SMTPTransport.sendMessage（SMTPTransport.java:636）
... 4更多

javax.mail.MessagingException: IOException while sending message; nested exception is: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; boundary="----=_Part_0_10430987.1294298904906" at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:676) at javax.mail.Transport.send0(Transport.java:189) at javax.mail.Transport.send(Transport.java:118) at Gmailer.GMailSender.sendMailAttach(GMailSender.java:114) at SendMail.main(SendMail.java:22) Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; boundary="----=_Part_0_10430987.1294298904906" at javax.activation.ObjectDataContentHandler.writeTo(Unknown Source) at javax.activation.DataHandler.writeTo(Unknown Source) at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403) at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1745) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:636) ... 4 more

带附件代码的邮件：

public synchronized void sendMailAttach(String subject, String body,
    String sender, String recipients)  {
try {
    MimeMessage message = new MimeMessage(session);

    message.setSender(new InternetAddress(sender));
    message.setSubject(subject);

    // Create the message part 
    BodyPart messageBodyPart = new MimeBodyPart();

    // Fill the message
    messageBodyPart.setText("hi Demo");

    Multipart multipart = new MimeMultipart();
    multipart.addBodyPart(messageBodyPart);

    // Part two is attachment
    messageBodyPart = new MimeBodyPart();
    String filename = "mail.txt";
    DataSource source = new FileDataSource(filename);
    messageBodyPart.setDataHandler(new DataHandler(source));
    messageBodyPart.setFileName(filename);
    multipart.addBodyPart(messageBodyPart);

    // Put parts in message
    message.setContent(multipart);

    if (recipients.indexOf(',') > 0)
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(recipients));
    else
        message.setRecipient(Message.RecipientType.TO,
                new InternetAddress(recipients));
    Transport.send(message);

}
catch (MessagingException e) {
    System.out.println("MessagingException" + e.getMessage());
}
catch (Exception e) {
    System.out.println("Mail Send Exception " + e.getMessage());
}
 }

文本邮件发送代码：

public synchronized void sendMail(String subject, String body,
    String sender, String recipients) throws Exception {
try {
    MimeMessage message = new MimeMessage(session);
    DataHandler handler = new DataHandler(new ByteArrayDataSource(
            body.getBytes(), "text/plain"));
    message.setSender(new InternetAddress(sender));
    message.setSubject(subject);
    message.setDataHandler(handler);
    if (recipients.indexOf(',') > 0)
        message.setRecipients(Message.RecipientType.TO,
                InternetAddress.parse(recipients));
    else
        message.setRecipient(Message.RecipientType.TO,
                new InternetAddress(recipients));
    Transport.send(message);
} catch (Exception e) {

}
}

推荐答案

首先，您可以使用 MimeBodyPart.attachFile（）而不是纠缠 DataSource / DataHandler 自己编码。

Firstly, you could make your code a little more concise by using MimeBodyPart.attachFile() instead of wrangling the DataSource/DataHandler code yourself.

其次，尝试设置附件部分上的 Content-Type 和 Content-Disposition 标头，并带有适当的值。 （默认情况下， attachFile 会为您设置Content-Disposition。）例如，

Secondly, try setting the Content-Type and Content-Disposition headers on your attachment part with appropriate values. (attachFile will set the Content-Disposition for you by default.) For instance,

messageBodyPart = new MimeBodyPart();
messageBodyPart.attachFile(new File("mail.txt"));
messageBodyPart.setHeader("Content-Type", "text/plain; charset=\"us-ascii\"; name=\"mail.txt\"");

---

编辑：

在思考了一下之后，这必须是类加载的问题。请查看此其他SO主题以查看是否补救你的情况。 （一般问题：你的类路径中可能还有一个额外的activation.jar;还有一些其他的可能性也会导致它。）

After thinking a bit, this has to be something amiss with class loading. Please check this other SO thread to see if it remedies your situation. (General issue: Probably an extra activation.jar in your classpath; a few other possibilities also thought to cause it.)

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