三個類，一個接口，不費話：
程序代碼
public interface IHello {
public void hello(String name);
}
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public class HelloSpeaker implements IHello {
public void hello(String name) {
System.out.println("Hello, " + name);
}
}
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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);
}
}
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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，拷貝上面的自己運行看看就知道了，原來切面就是這么回事。