public static Object getFieldValue(final Object obj, final String fieldName) {
        if (Objects.isNull(obj) || StringUtils.isBlank(fieldName)) {
            return null;
        }
        return getFieldValue(obj, getField(obj.getClass(), fieldName));
    }
Get field value object.

@param obj       the obj
@param fieldName the field name
@return the object
shenyu-common/src/main/java/org/apache/shenyu/common/utils/ReflectUtils.java