try{  URL url = new URL(address);  HttpURLConnection conn = (HttpURLConnection)url.openConnection();  conn.setUseCaches(false);  conn.setInstanceFollowRedirects(true);  conn.setConnectTimeout(waitMilliSecond);  conn.setReadTimeout(waitMilliSecond);  //HTTP connect  try {    conn.connect();  } catch(Exception e) {    e.printStackTrace();    return false;  }  int code = conn.getResponseCode();  if ((code >= 100) && (code < 400)){    return true;  }  return false;}catch (Exception e){  e.printStackTrace();  return false;}

try {  URL url = new URL(address);  String host = url.getHost();  int port = url.getPort();  if (port == -1) {    port = 80;  }  Socket socket = new Socket();  InetSocketAddress isa = new InetSocketAddress(InetAddress.getByName(host), port);  socket.connect(isa, timeout);  if (socket.isConnected()) {    return true;  } else {    return false;  }} catch (Exception e) {  e.printStackTrace();} finally {  if (socket != null) {    try {      socket.close();    } catch (IOException e) {      e.printStackTrace();    }  }}