docs: public static Method getGetMethod(Class c, String methodName, Class... paras)
  	{
  
  		//需要优化
  		try
  		{
  
  			Method m = c.getMethod(methodName, paras);
  			m.setAccessible(true);
  			return m;
  		}
  		catch (SecurityException e)
  		{
  			return null;
  		}
  		catch (NoSuchMethodException e)
  		{
  			return null;
  		}
  	}