在spring中获取代理对象代理的目标对象工具类

经过此种方式获取目标对象是不可靠的，或者说任何获取目标对象的方式都是不可靠的，由于TargetSource，TargetSource中存放了目标对象，但TargetSource有不少种实现，默认咱们使用的是SingletonTargetSource ，但还有其余的好比ThreadLocalTargetSource、CommonsPoolTargetSource 等等

 

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;
	}
	
}