学步园

package DomancyProxy;

public interface Subject {
 void request();
}

package DomancyProxy;

public interface Subject1 {
 void response();
}

package DomancyProxy;

public class RealSubject implements Subject,Subject1 {
	@Override
	public void request() {
		// TODO Auto-generated method stub
		System.out.println("real subject request");
	}

	@Override
	public void response() {
		// TODO Auto-generated method stub
		System.out.println("real subject response");
	}
}

package DomancyProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class DomancyInvohandler implements InvocationHandler {

	RealSubject rs;
	public DomancyInvohandler(RealSubject rs)
	{
		this.rs=rs;
	}
	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		System.out.println("before request");
		if(rs!=null)
		{
			method.invoke(rs, args);
		}
		System.out.println("end request");
		return null;
	}
}

package DomancyProxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

public class Client {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		RealSubject rs=new RealSubject();
		InvocationHandler ih=new DomancyInvohandler(rs);
		Subject1 s1=(Subject1) Proxy.newProxyInstance(ih.getClass().getClassLoader(), new Class[]{Subject1.class}, ih);
		s1.response();
		System.out.println("-------------------------------------------------------");
		Subject s2=(Subject) Proxy.newProxyInstance(ih.getClass().getClassLoader(), new Class[]{Subject1.class,Subject.class}, ih);
		s2.request();
		System.out.println("-------------------------------------------------------");
		Subject s=(Subject) Proxy.newProxyInstance(ih.getClass().getClassLoader(), rs.getClass().getInterfaces(), ih);
		s.request();
		System.out.println("-------------------------------------------------------");
		System.out.println(s.getClass());
		System.out.println(s1.getClass());
		System.out.println(s2.getClass());
	}

}

运行结果：

before request
real subject response
end request
-------------------------------------------------------
before request
real subject request
end request
-------------------------------------------------------
before request
real subject request
end request
-------------------------------------------------------
class $Proxy2
class $Proxy0
class $Proxy1