Spring 关于动态代理

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动态代理机制主要实现是一个代理类java.lang.reflect.Proxy类和java.lang.reflect.InvocationHandler接口。

例如有一个业务接口类

import org.apache.log4j.Level;

public interface TimeBookInterface {
public void doAuditing(String name);

}

//接口实现类

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

import com.gc.impl.TimeBookInterface;

public class TimeBook implements TimeBookInterface {
private Logger logger = Logger.getLogger(this.getClass().getName());
   public void doAuditing(String name){

//   logger.log(Level.INFO,name+" 开始审核数据....");


    logger.log(Level.INFO,name+" 正在审核数据....");
   }
}

// 代理类

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

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

public class LogProxy implements InvocationHandler {
private Logger logger = Logger.getLogger(this.getClass().getName());
    private Object delegate;
public Object invoke(Object proxy, Method method, Object[] args)
   throws Throwable {
  // TODO Auto-generated method stub
  Object result = null;
  try
  {
   logger.log(Level.INFO,args[0]+" 开始审核数据...");
            result = method.invoke(delegate, args);
            logger.log(Level.INFO,args[0]+" 审核数据结束...");
  }catch(Exception e){
   logger.log(Level.INFO,e.toString());

  }
  return result;
}
public Object bind(Object delegate){
  this.delegate = delegate;
  return Proxy.newProxyInstance(delegate.getClass().getClassLoader(), delegate.getClass().getInterfaces(), this);
}

}

//测试代码

import com.gc.action.TimeBook;
import com.gc.impl.TimeBookInterface;

public class TEST {
public static void main(String args[]){
   // 代理类
   LogProxy logProxy = new LogProxy();
   TimeBookInterface timBookInterface = (TimeBookInterface)logProxy.bind(new TimeBook());
   timBookInterface.doAuditing("张三");
}
}