获取主机名和IP

import java.net.InetAddress;
import java.net.UnknownHostException;


public class Test
{
    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);  
    }  
}