private static String numToIP(int addr) {
        return (addr & 0x000000FF) + "."
                + ((addr & 0x0000FFFF) >>> 8) + "."
                + ((addr & 0x00FFFFFF) >>> 16) + "."
                + (addr >>> 24);
    }

    private static void upload(long uin, byte[] ukey, byte[] pic, byte[] md5, String addr, int port, int appid) throws IOException {
        PbPack pbPack = new PbPack();
        pbPack.setVarint("1.1", 1);
        pbPack.setString("1.2", String.valueOf(uin));
        pbPack.setString("1.3", "PicUp.DataUp");
        pbPack.setVarint("1.4", new Random().nextInt(9999) + 10000);
        pbPack.setVarint("1.5", 0);
        pbPack.setVarint("1.6", appid);
        pbPack.setVarint("1.7", 4096);
        pbPack.setVarint("1.8", 1);

        pbPack.setVarint("2.2", pic.length);
        pbPack.setVarint("2.3", 0);
        pbPack.setVarint("2.4", pic.length);

        pbPack.setBytes("2.6", ukey);
        pbPack.setBytes("2.8", md5);
        pbPack.setBytes("2.9", md5);
        byte[] array = pbPack.array();
        Packet packet = new Packet();
        packet.setByte(0x28);

        packet.setInt(array.length);
        packet.setInt(pic.length);
        packet.setBytes(array);
        packet.setBytes(pic);

        packet.setByte(0x29);

        byte[] body = packet.array();

        Socket socket = new Socket(addr, port);
        OutputStream os = socket.getOutputStream();
        os.write(body);
        os.flush();
        InputStream is = socket.getInputStream();
        byte[] buf = new byte[1024];
        int len = 0;
        while ((len = is.read(buf)) != -1) {
            System.out.println(HexUtil.bin2hex(buf, 0, len));
        }

        socket.close();
    }