学习了：http://blog.csdn.net/tterminator/article/details/52494141

http://blog.csdn.net/fw0124/article/details/41227543

整理如下：

Socket client = null;    // 创建一个流套接字,连接到指定主机上的指定端口号        //    client = new Socket(IP, PORT);    client = new Socket();    SocketAddress socketAddress = new InetSocketAddress(IP, PORT);    int timeout = 10000;    client.connect(socketAddress, timeout);    client.setSoTimeout(timeout);