jdk 动态代理使用

public interface User {
	
	void save();

}

public class UserImpl implements User {

	public void save() {
		System.out.println("save");
	}
	
	public static void main(String[] args) {
		UserHandler handler=new UserHandler();
		User service=(User) handler.bind(new UserImpl());
		service.save();
	}

}

 

public class UserHandler implements InvocationHandler {
	private Object target;
	
	public Object bind(Object target){
		this.target=target;
		return Proxy.newProxyInstance(target.getClass().getClassLoader(),
				target.getClass().getInterfaces(),this);
	}

	public Object invoke(Object proxy, Method method, Object[] args)throws Throwable {
		Object result = null;
		long start = System.currentTimeMillis();
		result = method.invoke(target, args);
		long end=System.currentTimeMillis();
		System.out.println("方法耗时=="+(end-start)/1000);
		return result;
	}

}

 PS：原理还没彻底搞懂，主要反射那块，抽空再深入研究一下，先记录。