code: public static Map<String, PropertyDescriptor> getPropertyDescriptorMap(Class<?> clazz, boolean ignoreCase) throws BeanException {
  		Map<String, PropertyDescriptor> map = BeanInfoCache.INSTANCE.getPropertyDescriptorMap(clazz, ignoreCase);
  		if (null == map) {
  			map = internalGetPropertyDescriptorMap(clazz, ignoreCase);
  			BeanInfoCache.INSTANCE.putPropertyDescriptorMap(clazz, map, ignoreCase);
  		}
  		return map;
  	}
docs: 获得字段名和字段描述Map，获得的结果会缓存在 {@link BeanInfoCache}中
  
  @param clazz Bean类
  @param ignoreCase 是否忽略大小写
  @return 字段名和字段描述Map
  @throws BeanException 获取属性异常