import java.net.InetAddress;

 import java.net.NetworkInterface;

 import java.util.Enumeration;

 public class Test {

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

         java.net.InetAddress address=InetAddress.getByName("www.baidu.com");

         System.out.println(address.getHostName());

         System.out.println(address.getHostAddress());

         InetAddress[] addresss=InetAddress.getAllByName("www.baidu.com");

         for(InetAddress a : addresss){

             System.out.println(a);

         }

         InetAddress localAddress=InetAddress.getLocalHost();

         System.out.println(localAddress);

         //判断IP地址

         byte[] addressByte=localAddress.getAddress();

         if(addressByte.length==4){

             System.out.println("这个是ip4地址!");

         }else if(addressByte.length==16){

             System.out.println("这个是ip6地址!");

         }else{

             System.out.println("未知地址...");

         }

         NetworkInterface netInterface=NetworkInterface.getByInetAddress(localAddress);

         System.out.println(netInterface);

         //获取所有的网络接口

         Enumeration<NetworkInterface> netInNetworkInterface=NetworkInterface.getNetworkInterfaces();

         while(netInNetworkInterface.hasMoreElements()){

             NetworkInterface ni=netInNetworkInterface.nextElement();

             System.out.println(ni);

         }

     }

 }