如何通过java自带的库查看一个域名的IP地址？

package ip;

import java.net.InetAddress; import java.net.UnknownHostException; import java.util.Arrays;

/** * java 中提供的两个类 * InetAddress 获取ip 能获取端口？不能 * InetSocketAddress 获取ip 和端口 * @author superdrew */ public class TestInetAddress {

public static void main(String[] args) throws UnknownHostException {
    //获取本机的ip地址和域名   
    InetAddress ia = InetAddress.getLocalHost();
    System.out.println(ia.toString());
    System.out.println(ia.getHostName());//域名               127 
    System.out.println(ia.getHostAddress());//ip地址           192.168.201.254
    System.out.println(Arrays.toString(ia.getAddress()));//-64, -88, 6, -2(最高位是1)
    
    //获取固定网址的ip和域名
    InetAddress ia2 = InetAddress.getByName("www.baidu.com");
    System.out.println(ia2.toString());
    System.out.println(ia2.getHostName());//域名               127 
    System.out.println(ia2.getHostAddress());//ip地址    

}

}

最方便的是java.net.InetAddress.getByName("URL");