Java的代理机制

//LogProxy.java

package com.wdf.proxy;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;

public class LogProxy implements InvocationHandler{
private Logger logger=Logger.getLogger(this.getClass().getName());
private Object delegate;
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 {
// TODO Auto-generated method stub
Object result=null;
SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
format.setLenient(false);
String currentDate=format.format(new Date());
logger.log(Level.INFO, currentDate);
result=method.invoke(delegate, args);
logger.log(Level.INFO, "end----");
return result;
}

}

//TimeBookInterface.java

package com.wdf.book;

public interface TimeBookInterface {
public void doAuditing(String name);
}
TimeBook.java

package com.wdf.book;

public class TimeBook implements TimeBookInterface{

public void doAuditing(String name) {
// TODO Auto-generated method stub
System.out.println(name);
}

}

//test.java

package com.wdf.book;

import com.wdf.proxy.LogProxy;

public class test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
LogProxy logproxy=new LogProxy();
TimeBookInterface tbi=(TimeBookInterface)logproxy.bind(new TimeBook());
tbi.doAuditing("wonderful");

}

}