JavaMail獲取已發送郵件

public static void main(String args[]) {
        Properties props = new Properties(); // 參數配置
        props.setProperty("mail.transport.protocol", "smtp"); // 使用的協議(JavaMail規範要求)
        props.setProperty("mail.smtp.host", "smtp.exmail.qq.com"); // 發件人的郵箱的SMTP服務器地址
        props.setProperty("mail.smtp.auth", "true"); // 須要請求認證
        // PS:某些郵箱服務器要求SMTP鏈接須要使用SSL安全認證(爲了提升安全性,郵箱支持SSL鏈接,也能夠本身開啓),
        // 若是沒法鏈接郵件服務器,仔細查看控制檯打印的 log,若是有有相似"鏈接失敗,要求 SSL安全鏈接"等錯誤,
        // 開啓 SSL安全鏈接
        // SMTP服務器的端口(非 SSL鏈接的端口通常默認爲 25,能夠不添加,若是開啓了SSL鏈接,
        // 須要改成對應郵箱的SMTP服務器的端口,具體可查看對應郵箱服務的幫助,
        // QQ郵箱的SMTP(SLL)端口爲465或587
        final String smtpPort = "465";
        props.setProperty("mail.smtp.port", smtpPort);
        props.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.setProperty("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.smtp.socketFactory.port", smtpPort);
        Session session = Session.getDefaultInstance(props);
        session.setDebug(false);
        try {
            Store store = session.getStore("imap");
            store.connect("imap.exmail.qq.com", "it01@tofba.com", "*****");// change the user and password accordingly
            Folder folder = store.getFolder("inbox");
            if (!folder.exists()) {
                System.out.println("inbox not found");
                System.exit(0);
            }
            folder.open(Folder.READ_ONLY);
            Message[] messages = folder.getMessages();
            if (messages == null || messages.length <= 0) {
                System.out.println("this inbox no messages");
                System.exit(0);
            }
            for (Message message : messages) {
                String subject = message.getSubject();
                if (StringUtils.isNotBlank(subject)) {
                    System.out.println("subject:" + subject);
                }
                /*
                 * 解析郵件內容
                 */
                Object content = message.getContent();
                if (null != content) {
                    if (content instanceof MimeMultipart) {
                        MimeMultipart multipart = (MimeMultipart)content;
                        parseMultipart(multipart);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 對複雜郵件的解析
     * 
     * @param multipart
     * @throws MessagingException
     * @throws IOException
     */
    public static void parseMultipart(Multipart multipart) throws MessagingException, IOException {
        int count = multipart.getCount();
        for (int idx = 0; idx < count; idx++) {
            BodyPart bodyPart = multipart.getBodyPart(idx);
            System.out.println(bodyPart.getContentType());
            if (bodyPart.isMimeType("text/plain")) {
                System.out.println(bodyPart.getContent());
            } else if (bodyPart.isMimeType("text/html")) {
                System.out.println(bodyPart.getContent());
            } else if (bodyPart.isMimeType("multipart/*")) {
                Multipart mpart = (Multipart)bodyPart.getContent();
                parseMultipart(mpart);
            } else if (bodyPart.isMimeType("application/octet-stream")) {
                String disposition = bodyPart.getDisposition();
                System.out.println(disposition);
                if (StringUtils.isNotBlank(disposition) && disposition.equalsIgnoreCase(BodyPart.ATTACHMENT)) {
                    String fileName = bodyPart.getFileName();
                    InputStream is = bodyPart.getInputStream();
                    copy(is, new FileOutputStream("D:\\tofba\\email\\" + fileName));
                }
            }
        }
    }
    
    /**
     * 文件拷貝,在用戶進行附件下載的時候,能夠把附件的InputStream傳給用戶進行下載
     * 
     * @param is
     * @param os
     * @throws IOException
     */
    public static void copy(InputStream is, OutputStream os)
        throws IOException {
        byte[] bytes = new byte[1024];
        int len = 0;
        while ((len = is.read(bytes)) != -1) {
            os.write(bytes, 0, len);
        }
        if (os != null)
            os.close();
        if (is != null)
            is.close();
    }