java.lang.Object
  |
+--java.net.InetAddress

● byte[] getAddress()
● static InetAddress[] getAllByName(String host)
● static InetAddress getByAddr(byte[] addr)
● static InetAddress getByAddr(String host, byte[] addr)
● static InetAddress getByName(String host)
● String getHostAddress()
● static InetAddress getLocalHost()
… …

//IPAddressDemo.java
import java.net.*;
public class IPAddressDemo
{
    InetAddress localIPAddress = null;
    InetAddress ccidnetIPAddress = null;
    public  static void main( String args[])
    {
        IPAddressDemo  ipInstance;
        ipInstance = new IPAddressDemo();
        System.out.println("本机IP地址 : " + ipInstance.getLocalIP());
        System.out.println("赛迪网服务器IP地址 : " + 
ipInstance.getCCIDNETIP("www.ccidnet.com.cn"));
        System.out.println("赛迪网服务器域名 : " + 
ipInstance.getCCIDNETName());
     }
     //取得本机IP地址成员方法
     public InetAddress getLocalIP() 
     {
       try
       {
          localIPAddress = InetAddress.getLocalHost();
       }
       catch (UnknownHostException e) 
       {}
       return ( localIPAddress );
     }  
     //取得赛迪网服务器的IP地址成员方法
     public InetAddress getCCIDNETIP( String strServerName )
     {
        try
        {
           ccidnetIPAddress = InetAddress.getByName( strServerName );
        }  
        catch (UnknownHostException e)
        {}
        return ( ccidnetIPAddress );
     }
     //通过IP地址封装对象取得计算机系统域名成员方法
     public String getCCIDNETName()
     {
     	String strServerName = null;
        try
        {
           strServerName = ccidnetIPAddress.getHostName();
        }  
        catch (SecurityException e)
        {}
        return ( strServerName );
     }
}

本机IP地址 : support/192.168.19.251
赛迪网服务器IP地址 : www.ccidnet.com.cn/210.51.0.73
赛迪网服务器域名 : www.ccidnet.com.cn