动态代理

DynamicProxy.java

import static com.mceiba.util.Print.*;
import java.lang.reflect.*;
import java.lang.reflect.Proxy;

interface Something{
	void doSomething();
	void somethingElse(String arg);
}
class RealObjects implements Something{
	public void doSomething() { println("doSomething"); }
	public void somethingElse(String arg) { println("somethingElse "+arg); }
}
class DynamicProxyHandler implements InvocationHandler{
	private Object proxied;
	public DynamicProxyHandler(Object proxied) { this.proxied = proxied; }
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable{
		println("**** proxy: "+proxy.getClass()+", method: "+method+", args: "+args);
		if(args != null)
			for(Object arg : args) println("  "+arg);
		return method.invoke(proxied, args);
	}
}
public class DynamicProxy{
	public static void consumer(Something iface){
		iface.doSomething();
		iface.somethingElse("bonn");
	}
	public static void main(String[] args){
		RealObjects real = new RealObjects();
		consumer(real);
		Something proxy = (Something)Proxy.newProxyInstance(
			Something.class.getClassLoader(),
			new Class[]{ Something.class },
			new DynamicProxyHandler(real));
		consumer(proxy);
	}
}