【背景】

近日在研究domino web邮件下载功能，下载的邮件能够导入foxmail、outlook邮件client，下载的邮件格式为eml。

【參考代码】（须要下载jmail.jar包）

private void makeEml(String unid) {

		Document memo=null;

		RichTextItem body=null;

		try {

			memo = maildb.getDocumentByUNID(unid);

			String mailtime=((String) memo.getCreated().getLocalTime());

			String d_email = memo.getItemValueString("From");

			Vector v_to = memo.getItemValue("SendTo");

			Vector v_cc = memo.getItemValue("CopyTo");

			Vector v_bcc = memo.getItemValue("BlindCopyTo");

			String m_subject = memo.getItemValueString("Subject");

			String m_text = memo.getItemValueString("Body");

			Properties props = new Properties();

			Session session = Session.getInstance(props, null);

			//System.out.println("-----00000000------");

			try {

				MimeMessage msg = new MimeMessage(session);

				msg.setSubject(m_subject);

				//msg.setFrom(new InternetAddress(javax.mail.internet.MimeUtility.encodeText(d_email,"UTF-8", "B").replaceAll(" ", "")));

				msg.setFrom(new InternetAddress(javax.mail.internet.MimeUtility.encodeText((String)d_email,"UTF-8", "B").replaceAll(" ", "")));

				//System.out.println("-----111111------");

				for (int i=0; i<v_to.size(); i++){

					System.out.println("-----111111---0000---="+javax.mail.internet.MimeUtility.encodeText((String) v_to.elementAt(i),"UTF-8", "B").replaceAll(" ", ""));

					InternetAddress[] toaddress = InternetAddress.parse(javax.mail.internet.MimeUtility.encodeText((String) v_to.elementAt(i),"UTF-8", "B").replaceAll(" ", ""));

					msg.addRecipients(Message.RecipientType.TO, toaddress);

					//msg.addRecipients(Message.RecipientType.TO, toaddress);

					//System.out.println("-----111111---1111--222-");

				}

				for (int i=0; i<v_cc.size(); i++){

					InternetAddress[] ccaddress = InternetAddress.parse(javax.mail.internet.MimeUtility.encodeText((String) v_cc.elementAt(i),"UTF-8", "B").replaceAll(" ", ""));

					msg.addRecipients(Message.RecipientType.CC, ccaddress);

				}	

				//System.out.println("-----111111--333----");

				for (int i=0; i<v_bcc.size(); i++){

					InternetAddress[] bccaddress = InternetAddress.parse(javax.mail.internet.MimeUtility.encodeText((String) v_bcc.elementAt(i),"UTF-8", "B").replaceAll(" ", ""));

					msg.addRecipients(Message.RecipientType.BCC, bccaddress);

				}				

				MimeBodyPart p1 = new MimeBodyPart();

				p1.setText(m_text);

				Multipart mp = new MimeMultipart();

				mp.addBodyPart(p1);

				String extractMimePath=extractPath+memo.getNoteID()+"/";

				File extractDir2 = new File(extractMimePath);

				extractDir2.mkdirs();

				MIMEEntity mime = memo.getMIMEEntity();

				if (mime != null) {

					MimeBodyPart p2 = new MimeBodyPart(mime.getInputStream());

					mp.addBodyPart(p2);

				} else {

                         //System.out.println("Body="+m_text);

                         //System.out.println("Body="+memo.getFirstItem("Body").getType())

				     body = (RichTextItem) memo.getFirstItem("Body");

					Vector v = body.getEmbeddedObjects();

					Enumeration e = v.elements();

					while (e.hasMoreElements()) {

						eo = (EmbeddedObject) e.nextElement();

						filename = eo.getName();

						eo.extractFile(extractMimePath + filename);

						FileDataSource fds = new FileDataSource(extractMimePath

								+ filename);

						MimeBodyPart p2 = new MimeBodyPart();

						p2.setDataHandler(new DataHandler(fds));

						p2.setHeader("Content-Transfer-Encoding", "Base64");

						p2.setFileName(MimeUtility.encodeText(filename));

						mp.addBodyPart(p2);

					}

				}

				msg.setContent(mp);

				File emlFile = new File(extractPath+StringFilter(m_subject+" "+mailtime)+".eml");

		    	//File emlFile = new File(extractPath+memo.getNoteID()+".eml");

				emlFile.createNewFile();

				FileOutputStream outFile = new FileOutputStream(emlFile);

				msg.writeTo(outFile);

				outFile.close();

				deleteDir(extractDir2);

			} catch (MessagingException mex) {

				deleteDir(extractDir2);

				mex.printStackTrace();

			}

		} catch (Exception e) {

			e.printStackTrace();

		}finally{

			recycleRes(eo);

			recycleRes(body);

			recycleRes(memo);

			}

	}

	public static boolean deleteDir(File dir) {

		if (dir.isDirectory()) {

			String[] children = dir.list();

			for (int i = 0; i < children.length; i++) {

				boolean success = deleteDir(new File(dir, children[i]));

				if (!success) {

					return false;

				}

			}

		}

		return dir.delete();

	}

	public   static   String StringFilter(String   str)     {

	    	String regEx="[`~!@#$%^&*()+=|{}':;',\\[\\]\\\\.<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？]";

	    	Pattern   p   =   Pattern.compile(regEx);

	    	Matcher   m   =   p.matcher(str);

          //m=m.replaceAll("\\\\","");

	    	return   m.replaceAll("").trim();

	  } 

jar包下载地址：jar包下载