获取代理bean的原始对象

最新推荐文章于 2024-08-19 14:00:46 发布

原创最新推荐文章于 2024-08-19 14:00:46 发布 · 2.7k 阅读

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本文介绍了一种实用的工具类AopTargetUtil，用于从Spring AOP代理对象中获取原始的目标对象。通过判断代理类型（JDK动态代理或CGLIB），该工具类提供了getTarget方法来提取实际的目标对象，这对于深入理解和操作AOP代理机制具有重要意义。

public class AopTargetUtil {

   /**
    * 获取 目标对象
    * @param proxy 代理对象
    * @return
    * @throws Exception
    */
   public static Object getTarget(Object proxy) throws Exception {

      if(!AopUtils.isAopProxy(proxy)) {
         return proxy;//不是代理对象
      }

      if(AopUtils.isJdkDynamicProxy(proxy)) {
         return getJdkDynamicProxyTargetObject(proxy);
      } else { //cglib
         return getCglibProxyTargetObject(proxy);
      }

   }


   private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
      Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
      h.setAccessible(true);
      Object dynamicAdvisedInterceptor = h.get(proxy);

      Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
      advised.setAccessible(true);

      Object target = ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();

      return target;
   }


   private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
      Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
      h.setAccessible(true);
      AopProxy aopProxy = (AopProxy) h.get(proxy);

      Field advised = aopProxy.getClass().getDeclaredField("advised");
      advised.setAccessible(true);

      Object target = ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();

      return target;
   }
}