JDP-[代理模式]-一个例子-优快云博客

本文介绍了Java中的静态代理和动态代理模式的应用，通过实例展示了如何在实际项目中使用这些代理模式来增强代码的功能性和灵活性。

/*
 * @author junin
 * @date   2102-11-21
 * @email  junife@163.com
 */
package Proxy;
public interface Service 
{
    public void offerService();
}

/*
 * @author junin
 * @date   2102-11-21
 * @email  junife@163.com
 */
package Proxy;
public class PrintService implements Service
{
	@Override
	public void offerService()
    {
    	System.out.println("Printing now!");
    }
}

/*
 * @author junin
 * @date   2102-11-21
 * @email  junife@163.com
 */
package Proxy;
public class ScanService implements Service 
{
	@Override
	public void offerService() 
	{
		System.out.println("Scaning now!");
	}
}

/*
 * @author junin
 * @date   2102-11-21
 * @email  junife@163.com
 */
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  junife@163.com
 */
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  junife@163.com
 */
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  junife@163.com
 */
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();
    }
}