0 序

1 java.net包概述

2 关键类及源码分析

2.1 java.net.InetAddress

public static void main(String[] args) throws UnknownHostException {
	// 1.获取本机的InetAddress对象
	InetAddress localHost = InetAddress.getLocalHost();
	System.out.println(localHost); // LAPTOP-RVFFB7FM/192.168.23.1

	// 2.根据机器的名字获取InetAddress对象
	InetAddress inetAddress = InetAddress.getByName("C345678");
	System.out.println(inetAddress);// LAPTOP-RVFFB7FM/192.168.23.1

	// 3.根据域名返回InetAddress对象，比如www.baidu.com
	InetAddress inetAddress1 = InetAddress.getByName("www.baidu.com");
	System.out.println(inetAddress1);// www.baidu.com/120.232.145.185

	// 4.根据InetAddress对象，获取对应的ip地址
	String address = inetAddress1.getHostAddress();
	System.out.println(address);// 120.232.145.185

	// 5.通过InetAddress对象，获取对应的主机名
	String hostName = inetAddress1.getHostName();
	System.out.println(hostName);// www.baidu.com
}