如何获得spring代理对象的原对象

2024-04-02 19:55

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获得spring代理对象的原对象

看代码吧：


@SuppressWarnings({"unchecked"})
protected <T> T getTargetObject(Object proxy, Class<T> targetClass) throws Exception {
  if (AopUtils.isJdkDynamicProxy(proxy)) {
    return (T) ((Advised)proxy).getTargetSource().getTarget();
  } else {
    return (T) proxy; // expected to be cglib proxy then, which is simply a specialized class
  }
}


public class AopTargetUtils {
    
    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;
    }
    @SuppressWarnings({"unchecked"})
    protected <T> T getTargetObject(Object proxy, Class<T> targetClass) throws Exception {
        if (AopUtils.isJdkDynamicProxy(proxy)) {
            return (T) ((Advised)proxy).getTargetSource().getTarget();
        } else {
            return (T) proxy; // expected to be cglib proxy then, which is simply a specialized class
        }
    }
}

从Aop代理的对象中获取源对象



    @SuppressWarnings("unchecked")
    public static final <T> T getBeanFromProxy(T proxyObject) {
        Class<?> clazz = proxyObject.getClass();
        if(clazz.getName().startsWith("$Proxy")) {
            try {
                clazz = clazz.getSuperclass();
                Field hField = clazz.getDeclaredField("h");
                hField.setAccessible(true);
                Object hObject = hField.get(proxyObject);
 
                Class<?> dynamicProxyClass = hObject.getClass();
                Field advisedField = dynamicProxyClass.getDeclaredField("advised");
                advisedField.setAccessible(true);
                Object advisedObject = advisedField.get(hObject);
 
                Class<?> advisedSupportClass = advisedObject.getClass().getSuperclass().getSuperclass();
                Field targetField = advisedSupportClass.getDeclaredField("targetSource");
                targetField.setAccessible(true);
                Object targetObject = targetField.get(advisedObject);
 
                Class<?> targetSourceClass = targetObject.getClass();
                Field targetClassField = targetSourceClass.getDeclaredField("target");
                targetClassField.setAccessible(true);
                return (T) targetClassField.get(targetObject);
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。

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