网络编程 IP地址

import java.net.*;

public class IPDemo {

          public static void main(String[] args) throws Exception  

                {

                        InetAddress i=InetAddress.getLocalHost();  

                          /*                            * 输出本机的主机名和IP地址                            */

                        //System.out.println(i.toString());

                          /*                            * 输出本机IP地址                              */ 

                       //System.out.println("address:"+i.getHostAddress());

                          /*                            * 输出本机的主机名                            */

                       //System.out.println("name:"+i.getHostName());

                          /*                            * 任意主机IP地址                            */

                       InetAddress ia=InetAddress.getByName("192.168.3.125");   

                          /*                            * 输出该本机的IP地址                            */

                        System.out.println("address:"+i.getHostAddress()); 

                          /*                            * 输出该本机的主机名                            */

                       System.out.println("name:"+i.getHostName()); 

                 }

}