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三个类，一个接口，不费话：500)this.width=500'> 程序代码public interface IHello { public void hello(String name); } --------------------------------------------------------------------------------public class HelloSpeaker implements IHello { public void hello(String name) { System.out.println("Hello, " + name); }} -------------------------------------------------------------------------------- import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;import java.util.logging.Level;import java.util.logging.Logger;public class LogHandler implements InvocationHandler { private Object delegate; private Logger logger = Logger.getLogger(this.getClass().getName()); public Object bind(Object delegate) { this.delegate = delegate; return Proxy.newProxyInstance(delegate.getClass().getClassLoader(), delegate.getClass().getInterfaces(), this); } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { Object result = null; try { log("method starts..." + method); result = method.invoke(delegate, args); logger.log(Level.INFO, "method ends..." + method); } catch (Exception e) { log(e.toString()); } return result; } private void log(String message) { logger.log(Level.INFO, message); }} --------------------------------------------------------------------------------public class ProxyDemo { public static void main(String[] args) { LogHandler logHandler = new LogHandler(); IHello helloProxy = (IHello) logHandler.bind(new HelloSpeaker()); helloProxy.hello("Justin"); }』好了，拷贝上面的自己运行看看就知道了，原来切面就是这么回事。 |
