使用Java的代理机制进行日志输出

package proxy;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

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
public Object invoke(Object proxy,Method method, Object[] args) throws InvocationTargetException, IllegalAccessException {
Object result=null;
logger.log(Level.INFO,args[0]+"开始审核数据");
try {
result=method.invoke(delegate,args);
logger.log(Level.INFO,args[0]+"审核结束");
}catch(Exception e){
logger.log(Level.INFO,e.toString());
}
return result;
}
}
interface TimeBookInterface{
public void doAuditing(String name);
}
class TimeBook implements TimeBookInterface{
public void doAuditing(String name){
System.out.println("业务逻辑");
}
}
class test{
public static void main(String args[]){
LogProxy logProxy=new LogProxy();
TimeBookInterface timeBookInterface = (TimeBookInterface)logProxy.bind(new TimeBook());
timeBookInterface.doAuditing("张三");
}
}

输出信息：

业务逻辑
log4j:WARN No appenders could be found for logger (proxy.LogProxy).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.