java网络基本类使用(一)

1.怎么获取ip相关信息

 1 import java.net.InetAddress;
 2 import java.net.NetworkInterface;
 3 import java.util.Enumeration;
 4
 5
 6
 7 public class Test {
 8
 9     public static void main(String[] args) throws Exception{
10
11         java.net.InetAddress address=InetAddress.getByName("www.baidu.com");
12         System.out.println(address.getHostName());
13         System.out.println(address.getHostAddress());
14
15         InetAddress[] addresss=InetAddress.getAllByName("www.baidu.com");
16         for(InetAddress a : addresss){
17             System.out.println(a);
18         }
19
20         InetAddress localAddress=InetAddress.getLocalHost();
21         System.out.println(localAddress);
22
23         //判断IP地址
24         byte[] addressByte=localAddress.getAddress();
25         if(addressByte.length==4){
26             System.out.println("这个是ip4地址!");
27         }else if(addressByte.length==16){
28             System.out.println("这个是ip6地址!");
29         }else{
30             System.out.println("未知地址...");
31         }
32
33         NetworkInterface netInterface=NetworkInterface.getByInetAddress(localAddress);
34         System.out.println(netInterface);
35
36         //获取所有的网络接口
37         Enumeration<NetworkInterface> netInNetworkInterface=NetworkInterface.getNetworkInterfaces();
38         while(netInNetworkInterface.hasMoreElements()){
39             NetworkInterface ni=netInNetworkInterface.nextElement();
40             System.out.println(ni);
41         }
42     }
43
44 }