如何获得邮件文件的附件，比如有一个eml的邮件文件，里面带有附件，一个或者多个，如何获得这些附件？需要程序实现，给个方法，Java、C都可
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发送带有附件的邮件
发送带有附件的邮件的过程有些类似转发邮件，我们需要建立一个完整邮件的各个邮件体部分，在第一个部分（即我们的邮件内容文字）后，增加一个具有DataHandler的附件而不是在转发邮件时那样复制第一个部分的DataHandler。
如果我们将文件作为附件发送，那么要建立FileDataSource类型的对象作为附件数据源；如果从URL读取数据作为附件发送，那么将要建立URLDataSource类型的对象作为附件数据源。
然后将这个数据源（FileDataSource或是URLDataSource）对象作为DataHandler类构造方法的参数传入，从而建立一个DataHandler对象作为数据源的DataHandler。
接着将这个DataHandler设置为邮件体部分的DataHandler。这样就完成了邮件体与附件之间的关联工作，下面的工作就是BodyPart的setFileName()方法设置附件名为原文件名。
最后将两个邮件体放入到Multipart中，设置邮件内容为这个容器Multipart，发送邮件。
- Java code
// Define messageMessage message = new MimeMessage(session);message.setFrom(new InternetAddress(from));message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));message.setSubject("Hello JavaMail Attachment");// Create the message part BodyPart messageBodyPart = new MimeBodyPart();// Fill the messagemessageBodyPart.setText("Pardon Ideas");Multipart multipart = new MimeMultipart();multipart.addBodyPart(messageBodyPart);// Part two is attachmentmessageBodyPart = new MimeBodyPart();DataSource source = new FileDataSource(filename);messageBodyPart.setDataHandler(new DataHandler(source));messageBodyPart.setFileName(filename);multipart.addBodyPart(messageBodyPart);// Put parts in messagemessage.setContent(multipart);// Send the messageTransport.send(message);
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没做过，但是感觉可以自己解析。打开邮件文件，可以看到基本的邮件结构，其中附件肯定是以BASE64编码放在后面的，把它读出来解析，按照邮件中的文件名存储就可以了。
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学习
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我编过一个从邮箱里获取邮件附件的程序，供楼主参考吧
- Java code
import javax.mail.Authenticator;import javax.mail.Flags;import javax.mail.Folder;import javax.mail.Message;import javax.mail.Multipart;import javax.mail.Part;import javax.mail.PasswordAuthentication;import javax.mail.Session;import javax.mail.URLName;......public static Folder getMailFolder(String serverString, String username, String password) throws Exception { Folder folder = null; URLName server = new URLName(serverString); session = Session.getInstance(new Properties(), new MailAuthenticator(username, password)); folder = session.getFolder(server); System.out.println("\n\n\nFolder retrieved for " + serverString + ", with " + folder.getMessageCount() + " messages"); return folder; } public static void getEmailWithSubjectContaining(String emailUrl, String username, String password, String regex, String filepath, boolean addPrefix, boolean delete) throws Exception { Folder folder = getMailFolder(emailUrl, username, password); if (folder == null) return; folder.open(Folder.READ_WRITE); Message[] msgs = folder.getMessages(); System.out.println("Totally there are " + msgs.length); for (int i = 0; i < msgs.length; i++) { String pathToSave = filepath; String subject = msgs[i].getSubject(); System.out.println("Email subject: " + subject); if (!subject.matches(regex)) { System.out.println("Email subject doesn't match regex: " + regex + ", this email is ignored."); continue; } Part p = (Part) msgs[i]; if (addPrefix) { pathToSave = pathToSave + "/" + getFilenamePrefix(subject); } dumpAttachment(p, pathToSave); msgs[i].setFlag(Flags.Flag.DELETED, delete); //得到邮件后删除 } folder.expunge(); //清除邮箱里DELETE的邮件 folder.close(false); } public static void dumpAttachment(Part part, String filepath) throws Exception{ if (part.isMimeType("text/plain")) { System.out.println("This is plain text"); } else if (part.isMimeType("multipart/*")) { System.out.println("This is a Multipart, trying to dig into the attachment now"); Multipart mp = (Multipart) part.getContent(); int count = mp.getCount(); for (int i = 0; i < count; i++) dumpAttachment(mp.getBodyPart(i), filepath); } else if (part.isMimeType("message/rfc822")) { System.out.println("This is a Nested Message"); dumpAttachment((Part) part.getContent(), filepath); } else { Object o = part.getContent(); String attachmentFilename = "no_name"; if (part.getFileName() != null && !part.getFileName().equals("")) { attachmentFilename = part.getFileName(); } if (o instanceof String) { System.out.println("This is a string"); } else if (o instanceof InputStream) { System.out.println("This is just an input stream"); InputStream is = (InputStream) o; FileOutputStream fos = new FileOutputStream(filepath + formatFileExtension(attachmentFilename)); int c; int count = 0; System.out.print("Saving attachment: " + formatFileExtension(attachmentFilename)); while ((c = is.read()) != -1) { fos.write(c); if (count % 1000000 == 0) { System.out.print("\n"); } else if (count % 5000 == 0) { System.out.print("."); } count ++; } System.out.println("\nAttachment " + (format.format((double)count/1024)) + " Kilobytes saved as '" + filepath + formatFileExtension(attachmentFilename) + "'\n"); } else { System.out.println("This is an unknown type"); System.out.println(o.toString()); } } }......