code: public static Object invokeStatic(Class target, String methodName, Object[] paras) throws IllegalAccessException,
  			IllegalArgumentException, InvocationTargetException
  	{
  		return invoke(target, null, methodName, paras);
  
  	}
docs: 调用类的静态方法，只知道方法名和参数，beetl将自动匹配到能调用的方法
  @param target
  @param methodName
  @param paras
  @return
  @throws IllegalAccessException
  @throws IllegalArgumentException
  @throws InvocationTargetException