IP
ip地址：InetAddress
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唯一定位一台网络上计算机
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127.0.0.1 本机localhost
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ip地址分类
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ipv4/ipv6
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IPV4 127.0.0.1, 4个字节组成。
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IPV6 八个字节组成
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公网（互联网） 私网（局域网）
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ABCD类地址
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192.168.xx.xx专门给组织内部使用
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域名：记忆IP问题
package com.shushu.net;
import java.net.InetAddress;
import java.net.UnknownHostException;
//测试IP
public class TestInetAddress {
public static void main(String[] args) throws UnknownHostException {
//查询本机地址：127.0.0.1/localhost
InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
System.out.println(inetAddress);
InetAddress inetAddress2 = InetAddress.getByName("localhost");
System.out.println(inetAddress2);
//查询网站ip地址
InetAddress inetAddress1 = InetAddress.getByName("www.baidu.com");
System.out.println(inetAddress1);
//常用方法
System.out.println(inetAddress1.getAddress());
System.out.println(inetAddress1.getCanonicalHostName());//规范名
System.out.println(inetAddress1.getHostAddress());//ip
System.out.println(inetAddress1.getHostName());//域名
}
}
