code: public static  Method findMethodByAnnotationTag(Object target,String tag)
  	{
  		Method[] methods=target.getClass().getDeclaredMethods();
  		for(Method m:methods)
  		{
  			AnnotationTag function=m.getAnnotation(AnnotationTag.class);
  			if(function!=null && function.tag().equals(tag))
  			{
  				return m;
  			}
  		}
  		return null;
  	}
docs: 根据 {@link net.jueb.util4j.proxy.methodProxy.AnnotationTag} 属性匹配方法
  @param target
  @param tag
  @return