使用java获取计算机的IP和hostname

import java.util.*;
import java.net.*;

public class TestIP
{
        public static void main(String[] args)
        {
                String IP = null;
                String host = null;

                try
                {
                        InetAddress ia = InetAddress.getLocalHost(); 
                        host = ia.getHostName();//获取计算机主机名
                        IP= ia.getHostAddress();//获取计算机IP
                }
                catch(UnknownHostException e)
                {
                        e.printStackTrace();
                }

                System.out.println(host);
                System.out.println(IP);
        }
}