网络编程

import java.net.InetAddress;

/**

 * 网络通信的一个要素：IP地址，通过IP地址，唯一的定位互联网上一台主机

 * 

 * InetAddress位于java.net包下

 *InetAddress用来代表IP地址，一个该对象就代表一个IP地址

 *1.如何创建InetAddress的对象，getByName(String host);

 *2.getHostName();获取了域名

 *3.getHostAddress()；获取了IP地址

 * 

 */

public class TestInetAddress {

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

InetAddress inet = InetAddress.getByName("www.atguigu.com");

System.out.println("inet==>"+inet);

//两个方法

System.out.println("inet.getHostName()==>"+inet.getHostName());

System.out.println("inet.getHostAddress()==>"+inet.getHostAddress());

//获取本机ip：getLocalhost();

InetAddress inet1 = InetAddress.getLocalHost();

System.out.println("inet1==>"+inet1);

System.out.println("inet1.getHostName()==>"+inet1.getHostName());

System.out.println("inet1.getHostAddress()==>"+inet1.getHostAddress());

}

}

打印结果是：

inet==>www.atguigu.com/42.121.6.2

inet.getHostName()==>www.atguigu.com

inet.getHostAddress()==>42.121.6.2

inet1==>lixiumingdeMacBook-Air.local/192.168.2.102

inet1.getHostName()==>lixiumingdeMacBook-Air.local

inet1.getHostAddress()==>192.168.2.102