如何获得邮件文件的附件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
如何获得邮件文件的附件
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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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()); } } }......
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- Java code
package com.me.util.mail;/** * @author Zhangkun aistill@msn.com * @version 1.0 */import java.util.*;import javax.mail.*;import javax.mail.internet.*;import java.util.Date;import javax.activation.*;import java.io.*;import com.me.util.*;public class sendMail { private MimeMessage mimeMsg; //MIME邮件对象 private Session session; //邮件会话对象 private Properties props; //系统属性 private boolean needAuth = false; //smtp是否需要认证 private String username = ""; //smtp认证用户名和密码 private String password = ""; private Multipart mp; //Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象 /** * */ public sendMail() { setSmtpHost(getConfig.mailHost);//如果没有指定邮件服务器,就从getConfig类中获取 createMimeMessage(); } public sendMail(String smtp){ setSmtpHost(smtp); createMimeMessage(); } /** * @param hostName String */ public void setSmtpHost(String hostName) { System.out.println("设置系统属性：mail.smtp.host = "+hostName); if(props == null)props = System.getProperties(); //获得系统属性对象 props.put("mail.smtp.host",hostName); //设置SMTP主机 } /** * @return boolean */ public boolean createMimeMessage() { try{ System.out.println("准备获取邮件会话对象！"; session = Session.getDefaultInstance(props,null); //获得邮件会话对象 } catch(Exception e){ System.err.println("获取邮件会话对象时发生错误！"+e); return false; } System.out.println("准备创建MIME邮件对象！"; try{ mimeMsg = new MimeMessage(session); //创建MIME邮件对象 mp = new MimeMultipart(); return true; } catch(Exception e){ System.err.println("创建MIME邮件对象失败！"+e); return false; } } /** * @param need boolean */ public void setNeedAuth(boolean need) { System.out.println("设置smtp身份认证：mail.smtp.auth = "+need); if(props == null)props = System.getProperties(); if(need){ props.put("mail.smtp.auth","true"; }else{ props.put("mail.smtp.auth","false"; } } /** * @param name String * @param pass String */ public void setNamePass(String name,String pass) { username = name; password = pass; } /** * @param mailSubject String * @return boolean */ public boolean setSubject(String mailSubject) { System.out.println("设置邮件主题！"; try{ mimeMsg.setSubject(mailSubject); return true; } catch(Exception e) { System.err.println("设置邮件主题发生错误！"; return false; } } /** * @param mailBody String */ public boolean setBody(String mailBody) { try{ BodyPart bp = new MimeBodyPart(); bp.setContent("<meta http-equiv=Content-Type content=text/html; charset=gb2312>"+mailBody,"text/html;charset=GB2312"; mp.addBodyPart(bp); return true; } catch(Exception e){ System.err.println("设置邮件正文时发生错误！"+e); return false; } } /** * @param name String * @param pass String */ public boolean addFileAffix(String filename) { System.out.println("增加邮件附件："+filename); try{ BodyPart bp = new MimeBodyPart(); FileDataSource fileds = new FileDataSource(filename); bp.setDataHandler(new DataHandler(fileds)); bp.setFileName(fileds.getName()); mp.addBodyPart(bp); return true; } catch(Exception e){ System.err.println("增加邮件附件："+filename+"发生错误！"+e); return false; } } /** * @param name String * @param pass String */ public boolean setFrom(String from) { System.out.println("设置发信人！"; try{ mimeMsg.setFrom(new InternetAddress(from)); //设置发信人 return true; } catch(Exception e) { return false; } } /** * @param name String * @param pass String */ public boolean setTo(String to){ if(to == null)return false; try{ mimeMsg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to)); return true; } catch(Exception e) { return false; } } /** * @param name String * @param pass String */ public boolean setCopyTo(String copyto) { if(copyto == null)return false; try{ mimeMsg.setRecipients(Message.RecipientType.CC,(Address[])InternetAddress.parse(copyto)); return true; } catch(Exception e) { return false; } } /** * @param name String * @param pass String */ public boolean sendout() { try{ mimeMsg.setContent(mp); mimeMsg.saveChanges(); System.out.println("正在发送邮件...."; Session mailSession = Session.getInstance(props,null); Transport transport = mailSession.getTransport("smtp"; transport.connect((String)props.get("mail.smtp.host",username,password); transport.sendMessage(mimeMsg,mimeMsg.getRecipients(Message.RecipientType.TO)); //transport.send(mimeMsg); System.out.println("发送邮件成功！"; transport.close(); return true; } catch(Exception e) { System.err.println("邮件发送失败！"+e); return false; } } /** * Just do it as this */ public static void main(String[] args) { String mailbody = "<meta http-equiv=Content-Type content=text/html; charset=gb2312>"+ "<div align=center><a href=http://www.csdn.net> csdn </a></div>"; sendMail themail = new sendMail("smtp.msn.com"; themail.setNeedAuth(true); if(themail.setSubject("标题" == false) return; if(themail.setBody(mailbody) == false) return; if(themail.setTo("gates@msn.com" == false) return; if(themail.setFrom("bill@msn.com" == false) return; if(themail.addFileAffix("c:\\boot.ini" == false) return; themail.setNamePass("user","password"; if(themail.sendout() == false) return; }}
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