code: public static PropertyDescriptor getPropertyDescriptor(Class<?> clazz, final String fieldName, boolean ignoreCase) throws BeanException {
  		final Map<String, PropertyDescriptor> map = getPropertyDescriptorMap(clazz, ignoreCase);
  		return (null == map) ? null : map.get(fieldName);
  	}
docs: 获得Bean类属性描述
  
  @param clazz Bean类
  @param fieldName 字段名
  @param ignoreCase 是否忽略大小写
  @return PropertyDescriptor
  @throws BeanException 获取属性异常