3.ip地址

 1 package com.Inet.lesson1;
 2 
 3 import java.net.InetAddress;
 4 import java.net.UnknownHostException;
 5 
 6 //测试IP
 7 public class TestInetAddress {
 8     public static void main(String[] args) {
 9         try {
10             //查询本机地址
11             InetAddress inetAddress1 = InetAddress.getByName("127.0.0.1");
12             System.out.println(inetAddress1);
13             InetAddress inetAddress3 = InetAddress.getByName("localhost");
14             System.out.println(inetAddress3);
15             InetAddress inetAddress4 = InetAddress.getLocalHost();
16             System.out.println(inetAddress4);
17 
18             //查询网站地址
19             InetAddress inetAddress2 = InetAddress.getByName("www.baidu.com");
20             System.out.println(inetAddress2);
21 
22             //常用方法
23             System.out.println(inetAddress2.getHostAddress());//ip
24             System.out.println(inetAddress2.getHostName());//域名，或者自己的电脑的名字
25 
26         } catch (UnknownHostException e) {
27             e.printStackTrace();
28         }
29     }
30 }
31 结果：
32 /127.0.0.1
33 localhost/127.0.0.1
34 LAPTOP-TM88SOE4/169.254.67.166
35 www.baidu.com/39.156.66.17
36 39.156.66.17
37 www.baidu.com