JAVA AOP 实现 （简版）

=============Java实现代码

package org.rain.aop;

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

interface SmallRainTargetInterface {
	void doThing();
}

class SmallRainTargetImplementation implements SmallRainTargetInterface {
	@Override
	public void doThing() {
		System.out.println("逻辑代码调用");
	}
}

class SmallRainInvocationHandler implements InvocationHandler {
	private Object target;

	public SmallRainInvocationHandler(Object target) {
		this.target = target;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		long smallrainStart = System.currentTimeMillis();
		System.out.println("代码开始时间：" + smallrainStart);

		Object result = method.invoke(target, args);

		long smallrainStop = System.currentTimeMillis();
		System.out.println("代码结束时间：" + smallrainStop);

		System.out.println("代码执行时间：" + (smallrainStop - smallrainStart));

		return result;
	}
}

public class SmallRainAOP {
	public static void main(String[] args) {
		SmallRainTargetInterface smallraintarget = new SmallRainTargetImplementation();

		SmallRainTargetInterface smallrainproxy = (SmallRainTargetInterface) Proxy.newProxyInstance(
				smallraintarget.getClass().getClassLoader(), smallraintarget.getClass().getInterfaces(),
				new SmallRainInvocationHandler(smallraintarget));
		smallrainproxy.doThing();
	}
}