package com.sheting.reflect.proxy;
/**
* created by zheTing on 2018-03-06 06:04
*/
public interface IHello {
void hello(String name);
}
package com.sheting.reflect.proxy;
/**
* created by zheTing on 2018-03-06 06:06
*/
public class HelloSpeaker implements IHello {
@Override
public void hello(String name) {
System.out.println("Hello " + name);
}
}
package com.sheting.reflect.proxy;
import java.lang.reflect.*;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* created by zheTing on 2018-03-06 06:07
*/
public class LogHandler implements InvocationHandler {
private Logger logger = Logger.getLogger(this.getClass().getName());
private Object delegate;
public Object bind(Object delegate) {
this.delegate = delegate;
Class<?> proxyClass = Proxy.getProxyClass(delegate.getClass().getClassLoader(), delegate.getClass().getInterfaces());
Object proxyInstance = null;
try {
Constructor<?> constructor = proxyClass.getConstructor(new Class[]{InvocationHandler.class});
proxyInstance = constructor.newInstance(new Object[]{this});
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return proxyInstance;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
logger.log(Level.INFO, "method start..." + method.getName());
Object result = method.invoke(delegate, args);
logger.log(Level.INFO, "method end..." + method.getName());
return result;
}
public static void main(String[] args) {
LogHandler handler = new LogHandler();
IHello helloSpeaker = new HelloSpeaker();
IHello speakerProxy = (IHello) handler.bind(helloSpeaker);
speakerProxy.hello("sheting");
}
}