debugproxy.java

此为java开发方面的算法

/****************************************************
 * 参考书籍：<<Java面向对象编程>>                   *
 * 技术支持网址：www.javathinker.org                *
 ***************************************************/

package reflect.sample;

import java.lang.reflect.*;

public class DebugProxy implements InvocationHandler
{
    protected Object targetObj;

    public DebugProxy(Object aTargetObject)
    {
        targetObj = aTargetObject;
    }

    public Object invoke(Object theProxy, Method method, Object[] params)
        throws Throwable
    {
        try
        {
// Print out the name of the method you are invoking
            System.out.print("invoking "+method.getName()+"(");

// Print out the parameters
            for (int i=0; i < params.length; i++)
            {
                if (i > 0) System.out.print(",");
                System.out.print(params[i]);
            }
            System.out.print(") -> ");

// Invoke the real method on the target object
            Object retval = method.invoke(targetObj, params);

// Print out the result
            System.out.println(retval);

            return retval;
        }
        catch (InvocationTargetException exc)
        {
// If the method threw an exception, get the exception
            Throwable error = exc.getTargetException();

// Print out the exception
            System.out.println("threw "+error.toString());

// Throw it back to the caller
            throw error;
        }
        catch (Exception exc)
        {
// If there's an error just trying to invoke the method, print it out
            System.out.println("Got error: "+exc.toString()+
                " while invoking method");
            throw exc;
        }
    }
}