lightbulbclient.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.rmi.*;

// Chapter 11, Listing 4
public class LightBulbClient 
{
	public static void main(String args[])
	{
		System.out.println ("Looking for light bulb service");

		try
		{
			// Check to see if a registry was specified
			String registry = "localhost";
			if (args.length >=1)
			{
				registry = args[0];
			}

			// Registration format //registry_hostname (optional):port /service
			String registration = "rmi://" + registry + "/RMILightBulb";

			// Lookup the service in the registry, and obtain a remote service
			Remote remoteService = Naming.lookup ( registration );
			
			// Cast to a RMILightBulb interface
			RMILightBulb bulbService = (RMILightBulb) remoteService;
	
			// Turn it on
			System.out.println ("Invoking bulbservice.on()");
			bulbService.on();
			
			// See if bulb has changed
			System.out.println ("Bulb state : " + bulbService.isOn()  );

			// Conserve power
			System.out.println ("Invoking bulbservice.off()");
			bulbService.off();

			// See if bulb has changed
			System.out.println ("Bulb state : " + bulbService.isOn() );
		}
		catch (NotBoundException nbe)
		{
			System.out.println ("No light bulb service available  in registry!");
		}
		catch (RemoteException re)
		{
			System.out.println ("RMI Error - " + re);
		}
		catch (Exception e)
		{
			System.out.println ("Error - " + e);
		}
	}
}