0x01 从动态代理中获取
// 代码来自 http://jinnianshilongnian.iteye.com/blog/1613222
import java.lang.reflect.Field;
import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;
public class AopTargetUtils {
/**
* 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;
}
}
0x02 从Advised接口中获取
因为Spring的动态代理都实现了Advised接口，可以使用如下代码获取代理对象。
Advised advised = (Advised) proxy;
Object proxy = advised.getTargetSource().getTarget();
0x03 从ApplicationContext中获取
可以从ApplicationContext中获取相应类型的bean对象。