InetAddress类及Inet4Address/Inet6Address的使用方法
InetAddress类及Inet4Address/Inet6Address的使用方法
了解域名系统(DNS)原理,掌握InetAddress类及Inet4Address/Inet6Address的使用方法。
编写一个可重用的域名解析程序模块,使之能够将用户输入的域名解析为IP地址。
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIyZuBnL5MzNxMTM0gTM0EDNwkTMwIzLc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Scanner;
public class GetIP {
public static void main(String[]args)
{
try {
System.out.print("请输入需要解析的域名:");
Scanner in=new Scanner(System.in);
String domainname=in.nextLine();//输入要解析的域名(网站名)
System.out.println("使用InetAddress类的方法获取网站"+domainname+"的IP地址...");
System.out.println("总共ip个数:"
+ InetAddress.getAllByName(domainname).length);
InetAddress[] inetaddress = InetAddress.getAllByName(domainname);
for (int i = 0; i < inetaddress.length; i++) {
System.out.println("第" + (i + 1) + "个IP:" + inetaddress[i].getHostAddress());
String add = inetaddress[i].getHostAddress();
int length=add.length();
if(length <= 16)
System.out.println("根据byte数组长度判断此IP地址是IPv4地址!");
if(length > 16)
System.out.println("根据byte数组长度判断此IP地址是IPv6地址!");
}
} catch (UnknownHostException e) {
System.out.println("获取失败,没有对应的IP!");
}
}
}