JDP-[代理模式]-一个例子

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
public interface Service 
{
    public void offerService();
}

 

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
public class PrintService implements Service
{
	@Override
	public void offerService()
    {
    	System.out.println("Printing now!");
    }
}

 

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
public class ScanService implements Service 
{
	@Override
	public void offerService() 
	{
		System.out.println("Scaning now!");
	}
}

 

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
public class StaticProxy implements Service 
{
    Service service;
    public StaticProxy(Service service)
    {
    	this.service = service;
    }
    public void setServiceProxy(Service service)
    {
    	this.service = service;
    }
	@Override
	public void offerService() 
	{
	    this.beforeCall();
		this.service.offerService();
		this.afterCall();
	}
	public void beforeCall()
	{
		System.out.println("--BeforeCall--");
	}
	public void afterCall()
	{
		System.out.println("--AfterCall--");
	}
}

 

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
public class StaticClient 
{
    public static void main(String[] args) 
    {
	    Service servicePrint = new PrintService();	
	    Service scanPrint = new ScanService();
	    StaticProxy serviceProxy = new StaticProxy(servicePrint);
	    serviceProxy.offerService();
	    serviceProxy.setServiceProxy(scanPrint);
	    serviceProxy.offerService();
	}
}

 

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class DynamicProxy implements InvocationHandler 
{
    private Object object;
    public DynamicProxy (Object object)
    {
    	super();
    	this.object = object;
    }
	@Override
	public Object invoke(Object obj, Method method, Object[] args) throws Throwable 
	{
        this.beforeCall();
        method.invoke(object, args);
        this.afterCall();
        return null;
	}
	public void beforeCall()
	{
		System.out.println("--BeforeCall--");
	}
	public void afterCall()
	{
		System.out.println("--AfterCall--");
	}

}

 

 

/*
 * @author junin
 * @date   2102-11-21
 * @email  [email protected]
 */
package Proxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
public class DynamicClient
{
    public static void main(String[] args) 
    {
    	DynamicProxy dynamicProxy = new DynamicProxy(new PrintService());
    	Service service  = (Service)Proxy.newProxyInstance(Service.class.getClassLoader(), new Class[]{Service.class}, dynamicProxy);
	    service.offerService();
	    
	    dynamicProxy = new DynamicProxy(new ScanService());
    	service  = (Service)Proxy.newProxyInstance(Service.class.getClassLoader(), new Class[]{Service.class}, dynamicProxy);
	    service.offerService();
    }
}