Question

我使用以下代码发送mail.Text消息发送工作正常但邮件附件不起作用它给Exception.How解决这个

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; 边界= “---- = _ Part_0_10430987.1294298904906” at com.sun.mail.smtp.SMTPTransport.sendMessage（SMTPTransport.java:676）在javax.mail.Transport.send0（Transport.java:189）在javax.mail.Transport.send（Transport.java:118）在Gmailer.GMailSender.sendMailAttach（GMailSender.java:114）在SendMail.main（SendMail.java:22）引起：javax.activation.UnsupportedDataTypeException：没有MIME类型multipart / mixed的对象DCH; 边界= “---- = _ Part_0_10430987.1294298904906” 在javax.activation.ObjectDataContentHandler.writeTo（未知来源）在javax.activation.DataHandler.writeTo（未知来源）在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1403）在javax.mail.internet.MimeMessage.writeTo（MimeMessage.java:1745） at com.sun.mail.smtp.SMTPTransport.sendMessage（SMTPTransport.java:636） ......还有4个

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) {

}
}

Answer 1

首先，您可以使用MimeBodyPart.attachFile()而不是自己处理DataSource / DataHandler代码，使代码更简洁。

其次，尝试使用适当的值设置附件中的Content-Type和Content-Disposition标题。（attachFile默认情况下会为您设置Content-Disposition。）例如，

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

<小时/> 修改

在思考了一下之后，这必须是类加载的问题。请检查this other SO thread，看看它是否可以解决您的情况。（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。）

Answer 2

使用该代码放置该代码，然后检查它是否真的有用。首先，导入该包

import javax.activation.CommandMap;
import javax.activation.MailcapCommandMap;

MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
        mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
        mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
        mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
        mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
        mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
        CommandMap.setDefaultCommandMap(mc);

Answer 3

我认为您的程序无法找到mail.txt文件。请给出正确/完整的路径。异常堆栈跟踪可以提供更多的想法。如果可能的话回复。 e.printStacktrace（）;

Answer 4

这可能源于类加载问题（activation.jar的重复版本）。请参阅示例http://forum.springsource.org/archive/index.php/t-69180.html

或谷歌更多

Answer 5

设置此值：

message.setContent(body, "text/html; charset=UTF-8");    
messageBodyPart.setContent(body, "text/html; charset=UTF-8");

同时检查文件路径，或者在日志中写下完整路径

Answer 6

static {
     // add handlers for main MIME types
    MailcapCommandMap mcap = new MailcapCommandMap();
    mcap.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
    mcap.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
    mcap.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
    mcap.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed; x-java-fallback-entry=true");
    mcap.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
    CommandMap.setDefaultCommandMap(mcap);
}

Answer 7

尝试定义文件的确切路径mail.txt 例如，如果它在C:中，那么继续并包括整个路径，如

 String filename = ("c:\\users\\mail.txt");

并且请注意，有时您可能会遇到("c:\users\mail.txt")有单个反斜杠的问题，所以为了安全起见，请将它们设为双反斜杠

同时始终确保使用.printStackTrace()方法，因为它可以帮助您确定问题的确切位置，以便在您搜索该问题时，您将能够准确了解您将要查找的内容对

Answer 8

请参阅此链接：http://forum.spring.io/forum/osgi-related/dm-server-general/61205-problems-sending-mime-multipart-mails

它解释了问题的可能原因，并且通常建议解决问题。

我在jboss保险丝上使用apache camel时遇到了同样的问题。我不得不修改我的pom.xml ...请参阅下面的代码段：

    <!-- add a depency on javax.mail, in addition to the dependency on camel-mail -->

    <dependency>
        <groupId>org.apache.camel</groupId>
        <artifactId>camel-mail</artifactId>
        <version>2.10.0</version>
    </dependency>
    <dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
        <version>1.5.1</version>
    </dependency>

    <!-- explicitly import the com.sun.mail.handlers package under the Import-Package section of the pom.xml -->

    <Import-Package>com.sun.mail.handlers, *</Import-Package>

在java中发送消息时是否有MessagingExceptionIOException？

8 个答案: