networkresolverdemo.java

Java网络编程与分布式计算, 主要分析java网络各方面的编程, 提供许多实用安全

import java.net.*;

// Chapter 3, Listing 2
public class NetworkResolverDemo 
{
	public static void main(String args[])
	{
		if (args.length != 1)
		{
                        System.err.println ("Syntax - NetworkResolverDemo host");
			System.exit(0);
		}

		System.out.println ("Resolving " + args[0]);

		try
		{
			// Resolve host and get InetAddress
			InetAddress addr = InetAddress.getByName ( args[0] );

			System.out.println ("IP address : " +
				                addr.getHostAddress() );

                        System.out.println ("Hostname : " + addr.getHostName() );
		}
		catch (UnknownHostException uhe)
		{
			System.out.println ("Error - unable to resolve hostname");
		}
	}
}