java 獲取郵件數據

有時候我們需要去讀取指定郵箱裏面的郵件數據，這就需要使用到獲取郵件的方法了

public static void main(String args[]) throws MessagingException,
            IOException, javax.mail.MessagingException {
    	Properties props = new Properties();
        props.setProperty("mail.store.protocol", "pop3");
        props.setProperty("mail.pop3.host", "pop.163.com");
        Session session = Session.getDefaultInstance(props);
        Store store = session.getStore("pop3");
        store.connect("******", "******");		//郵箱帳號，郵箱的pop3/imap密碼不是郵箱的登錄密碼
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_WRITE);

        // 全部郵件數
        int messageCount = folder.getMessageCount();
        System.out.println("郵件總數："+messageCount);
        Message[] messages = folder.getMessages();
        for (int i = 0; i < messages.length; i++) {
            MimeMessage message = (MimeMessage) messages[i];
            // 刪除郵件
            // message.setFlag(Flags.Flag.DELETED, true);
            // 標記爲已讀
            // message.setFlag(Flags.Flag.SEEN, true);

            //pop3沒有判斷郵件是否爲已讀的功能，要使用Imap纔可以
            /*Flags flags = message.getFlags();
            if (flags.contains(Flags.Flag.SEEN))
                System.out.println("這是一封已讀郵件");
            else {
                System.out.println("未讀郵件");
                message.setFlag(Flags.Flag.SEEN, true);
            }*/
            if(message.getFrom() == null)
        		continue;
        	javax.mail.Address addr = message.getFrom()[0];
        	if(addr == null)
        		continue;
            String str_addr = addr.toString();

            System.out.println("發件郵箱：" + str_addr.substring(str_addr.indexOf("<")+1, str_addr.indexOf(">")));
            System.out.println("內容：" + message.getContent());
            System.out.println("郵件ID：" + message.getMessageID());


            //解析郵件內容
            Object content = message.getContent();
            if (content instanceof MimeMultipart) {
                MimeMultipart multipart = (MimeMultipart) content;
                parseMultipart(multipart);
            }
            System.out
                    .println("========================================================");
            System.out
                    .println("========================================================");

        }

        folder.close(true);
        store.close();


    }

    public static void parseMultipart(Multipart multipart) throws MessagingException, IOException, javax.mail.MessagingException {
        int count = multipart.getCount();
        String html = null;
        for (int idx=0;idx<count;idx++) {
            BodyPart bodyPart = multipart.getBodyPart(idx);
            if (bodyPart.isMimeType("text/plain")) {
                html = (String) bodyPart.getContent();
            } else if(bodyPart.isMimeType("text/html")) {
     //           System.out.println("html..................."+bodyPart.getContent());
                html = (String) bodyPart.getContent();
            } else if(bodyPart.isMimeType("multipart/*")) {
                Multipart mpart = (Multipart)bodyPart.getContent();
                parseMultipart(mpart);
            } else if (bodyPart.isMimeType("application/octet-stream")) {
                System.out.println("application/octet-stream...");
                String disposition = bodyPart.getDisposition();
                System.out.println(disposition);
                if (disposition.equalsIgnoreCase(BodyPart.ATTACHMENT)) {
                    String fileName = bodyPart.getFileName();
                    InputStream is = bodyPart.getInputStream();
                    copy(is, new FileOutputStream("D:\\"+fileName));
                }
            }
        }
        if(html == null)
        	return ;
        Document doc = Jsoup.parse(html);

    }

  

通過parseMultipart解析函數也能看出來，我們獲取到的郵件內容是一個html頁面，至於還需要怎麼去獲取想要的數據、信息，這就用自己的方法咯