设计模式8：Proxy

Server.java:

package gendwang.cisco.com;

public interface Server 
{
	public void handleRequest(String request);
}

AAAServer.java:

package gendwang.cisco.com;

public class AAAServer implements Server
{
	public void handleRequest(String request)
	{
		if(request.indexOf("user:gendwang password:123456") != -1)
		{
			System.out.println("This is an authorized user");
		}
		else
		{
			System.out.println("This is not an authorized user");
		}
	}
}

Proxy.java:

package gendwang.cisco.com;

public class Proxy implements Server 
{
	private Server server = null;
	
	public void handleRequest(String request)
	{
		System.out.println("Authenticating is started.");
		if(server == null)
		{
			server = new AAAServer();
		}
		server.handleRequest(request);
		System.out.println("Authenticating is finished");
	}
}

Test.java:

package gendwang.cisco.com;

public class Test 
{
	public static void main(String[] args) 
	{
		Server proxy = new Proxy();
		proxy.handleRequest("user:gendwang password:111111");
		System.out.println();
		proxy.handleRequest("user:gendwang password:123456");
	}

}