体现AOP思想的一个例子（InvocationHandler）

HelloWorld类：

public class HelloWorld implements HelloWorldInterface{

	@Override
	public void say(String con) {
		System.out.println(con);
	}
	
}

 HelloWorldInterface接口：

public interface HelloWorldInterface {
	public void say(String con);
}

 

LogProxy类：

//代理实现接口InvocationHandler
//Java动态代理

public class LogProxy implements InvocationHandler {

	private Logger logger = Logger.getLogger(this.getClass().getName());
	private Object delegate;

	// 绑定代理对象
	public Object bind(Object delegate) {
		this.delegate = delegate;
		return Proxy.newProxyInstance(delegate.getClass().getClassLoader(),
				delegate.getClass().getInterfaces(), this);
	}

	// 针对接口编程
	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		Object result = null;
		try {
			logger.log(Level.INFO, args[0] + "开始打出日志");
			result = method.invoke(delegate, args);
			logger.log(Level.INFO, args[0] + "结束日志");
		} catch (Exception e) {
			logger.log(Level.INFO, e.toString());
		}
		return result;
	}

}

 TestHelloWorld类：

public class TestHelloWorld {
	
	public static void main(String[] args) {
		LogProxy logProxy = new LogProxy();
		HelloWorldInterface hf = (HelloWorldInterface)logProxy.bind(new HelloWorld());
		hf.say("你好");
	}
}