利用JavaMail通过POP3协议、IMAP协议收取Gmail邮箱

POP3和IMAP的区别到处都有，这里不再敖述，只通过例子说明如下：

                  Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";// Get a Properties objectProperties props = System.getProperties();props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);props.setProperty("mail.pop3.socketFactory.fallback", "false");props.setProperty("mail.pop3.port", "995");props.setProperty("mail.pop3.socketFactory.port", "995");props.setProperty("mail.pop3.disabletop", "true");props.setProperty("mail.pop3.ssl.enable", "true");props.setProperty("mail.pop3.useStartTLS", "true");// 以下步骤跟一般的JavaMail操作相同Session session = Session.getDefaultInstance(props, null);URLName urln = new URLName("pop3", "pop.gmail.com", 995, null, username, password);Store store = session.getStore(urln);store.connect();

 

Folder inbox = null;try {store.connect();inbox = store.getFolder("INBOX");inbox.open(Folder.READ_ONLY);FetchProfile profile = new FetchProfile();profile.add(FetchProfile.Item.ENVELOPE);//profile.add(FetchProfile.Item.CONTENT_INFO);//profile.add(FetchProfile.Item.FLAGS);profile.add(UIDFolder.FetchProfileItem.UID);Message[] messages = inbox.getMessages();inbox.fetch(messages, profile);System.out.println("收件箱的邮件数：" + messages.length);for (int i = 0; i < messages.length; i++) {// 邮件发送者String from = decodeText(messages[i].getFrom()[0].toString());InternetAddress ia = new InternetAddress(from);System.out.println("FROM:" + ia.getPersonal() + '(' + ia.getAddress() + ')');// 邮件标题System.out.println("TITLE:" + messages[i].getSubject());// 邮件大小System.out.println("SIZE:" + messages[i].getSize());// 邮件发送时间System.out.println("DATE:" + messages[i].getSentDate());//邮件IDString uid = ((POP3Folder)inbox).getUID(messages[i]);System.out.println("UID:"+ uid);//收件人String to = decodeText(messages[i].getAllRecipients()[0].toString());InternetAddress iaTo = new InternetAddress(to);System.out.println("TO:" + iaTo.getPersonal() + '(' + iaTo.getAddress() + ')');//内容//String disposition; //Multipart mp = (Multipart) messages[i].getContent(); //int mpCount = mp.getCount(); //System.out.println("");//for (int m = 0; m < mpCount; m++){ ////BodyPart part = mp.getBodyPart(m); //disposition = part.getDisposition(); //if (disposition != null && disposition.equals(Part.ATTACHMENT)){ ////saveAttach(part,Constant.ZIP_DIR); //} else{ ////System.out.println(part.getContent()); //} //}File f = new File("/mail/test"+uid+".eml");messages[i].writeTo(new FileOutputStream(f)); }} finally {try {inbox.close(false);} catch (Exception e) {}try {store.close();} catch (Exception e) {}}

IMAP的见另一篇