Java 如何使用 Socket 连接到指定主机

import java.net.InetAddress;
import java.net.Socket;

public class WebPing {
   public static void main(String[] args) {
      try {
         InetAddress addr;
         Socket sock = new Socket("www.manong.com", 80);
         addr = sock.getInetAddress();
         System.out.println("连接到 " + addr);
         sock.close();
      } catch (java.io.IOException e) {
         System.out.println("无法连接 " + args[0]);
         System.out.println(e);
      }
   }
}