java网络编程-获取域名和ip地址

package com.zhiru;

import java.net.InetAddress;
import java.net.UnknownHostException;

/*
 * 域名和ip地址获取
 * Java中用InetAddress类获取域名和ip地址.
 */
public class DNSAndIPAddress {
	public DNSAndIPAddress(){

	}
	//根据域名获取ip地址
	public static InetAddress getIP(String dns) throws UnknownHostException{
		return InetAddress.getByName(dns);
	}
	//根据ip地址获取域名
	public static InetAddress getDNS(String ip) throws UnknownHostException{
		return InetAddress.getByName(ip);
	}
	//获取本机的域名和ip地址
	public static String getHostAddress() throws UnknownHostException{
		return InetAddress.getLocalHost().toString();
	}
	public static void main(String[] args) throws UnknownHostException{
		System.out.println(getIP("www.upc.edu.cn").toString());
		System.out.println(getDNS("www.baidu.com").toString());
		System.out.println(getDNS("www.csdn.net").toString());
		System.out.println(getDNS("www.cnblogs.com").toString());
		System.out.println(getDNS("www.importnew.com").toString());
		System.out.println(getDNS("zhirublog.lingw.net").toString());
		//System.out.println(getDNS("blog.csdn.net/zhiruchen").toString());
		System.out.println(getHostAddress());
	}
}

www.upc.edu.cn/121.251.255.36
www.baidu.com/119.75.218.77
www.csdn.net/117.79.157.225
www.cnblogs.com/42.121.252.58
www.importnew.com/106.186.122.244
zhirublog.lingw.net/60.191.221.85