java网络基本类使用(一)

1.怎么获取ip相关信息

 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);
         }
     }

 }