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);
        }
    }
    
}