golang-利用反射给结构体赋值

//将结构体里的成员按照json名字来赋值
func SetStructFieldByJsonName(ptr interface{}, fields map[string]interface{}) {
    logger.Debug("fields:", fields)

    v := reflect.ValueOf(ptr).Elem() // the struct variable

    for i := 0; i < v.NumField(); i++ {

        fieldInfo := v.Type().Field(i) // a reflect.StructField
        tag := fieldInfo.Tag           // a reflect.StructTag
        name := tag.Get("json")

        if name == "" {
            name = strings.ToLower(fieldInfo.Name)
        }
        //去掉逗号后面内容 如 `json:"voucher_usage,omitempty"`
        name = strings.Split(name, ",")[0]
        logger.Debug("JSONnAME:", name)

        if value, ok := fields[name]; ok {

            logger.Debug("fieldInfo.Name:", fieldInfo.Name)
            //给结构体赋值
            //保证赋值时数据类型一致
            logger.Debug("类型1：", reflect.ValueOf(value).Type(), "类型2：", v.FieldByName(fieldInfo.Name).Type())
            if reflect.ValueOf(value).Type() == v.FieldByName(fieldInfo.Name).Type() {
                v.FieldByName(fieldInfo.Name).Set(reflect.ValueOf(value))
            }

        }
    }

    return
}