根据JSON的Tag给结构体赋值

set value to struct by json tag

func JsonAssignTo(n interface{}, tagName, value string) {
	sv := reflect.ValueOf(n)
	if sv.Kind() == reflect.Ptr {
		//初始化空指针
		if sv.IsNil() && sv.CanSet() {
			sv.Set(reflect.New(sv.Type().Elem()))
		}
		sv = sv.Elem()
	}
	// 发现tag
	findJsonName := func(t reflect.StructTag, tag string) bool {
		if jt, ok := t.Lookup("json"); ok {
			return strings.Split(jt, ",")[0] == tag
		}
		return false
	}
	// 循环字段
	for i := 0; i < sv.NumField(); i++ {
		fv := sv.Field(i)
		if !fv.IsValid() || !fv.CanSet() {
			continue
		}
		ft := sv.Type().Field(i)
		find := findJsonName(ft.Tag, tagName)
		if !find {
			continue
		}
		// 根据结构体中的字段类型转换赋值
		switch sv.Field(i).Kind() {
		case reflect.String:
			fv.Set(reflect.ValueOf(value))
		case reflect.Int:
			if strings.Contains(value, ".") {
				vf, _ := strconv.ParseFloat(value, 64)
				fv.Set(reflect.ValueOf(int(vf)))
			} else {
				vi, _ := strconv.Atoi(value)
				fv.Set(reflect.ValueOf(vi))
			}
		}
	}
}

方法接收 结构体指针，tag，value

func TestNpcR(t *testing.T) {
	n := &NPCSheetRow{}
	JsonAssignTo(n, "type", "3")
	t.Logf("%+v\n", n)
	JsonAssignTo(n, "npc_id", "1")
	t.Logf("%+v\n", n)
	JsonAssignTo(n, "name_cn", "666hhh")
	t.Logf("%+v\n", n)
}