Golang 实现interface类型转string类型

看代码吧~

// Strval 获取变量的字符串值
// 浮点型 3.0将会转换成字符串3, "3"
// 非数值或字符类型的变量将会被转换成JSON格式字符串
func Strval(value interface{}) string {
var key string
if value == nil {
return key
}
switch value.(type) {
case float64:
ft := value.(float64)
key = strconv.FormatFloat(ft, 'f', -1, 64)
case float32:
ft := value.(float32)
key = strconv.FormatFloat(float64(ft), 'f', -1, 64)
case int:
it := value.(int)
key = strconv.Itoa(it)
case uint:
it := value.(uint)
key = strconv.Itoa(int(it))
case int8:
it := value.(int8)
key = strconv.Itoa(int(it))
case uint8:
it := value.(uint8)
key = strconv.Itoa(int(it))
case int16:
it := value.(int16)
key = strconv.Itoa(int(it))
case uint16:
it := value.(uint16)
key = strconv.Itoa(int(it))
case int32:
it := value.(int32)
key = strconv.Itoa(int(it))
case uint32:
it := value.(uint32)
key = strconv.Itoa(int(it))
case int64:
it := value.(int64)
key = strconv.FormatInt(it, 10)
case uint64:
it := value.(uint64)
key = strconv.FormatUint(it, 10)
case string:
key = value.(string)
case []byte:
key = string(value.([]byte))
default:
newValue, _ := json.Marshal(value)
key = string(newValue)
}
return key
}

补充：golang json 为map[string] interface{}

json字符串：

{"sn":1,"ls":false,"bg":0,"ed":0,"ws":[{"bg":0,"cw":[{"sc":0,"w":"还"}]},{"bg":0,"cw":[{"sc":0,"w":"有点"}]},{"bg":0,"cw":[{"sc":0,"w":"眼熟"}]}]}

需要将json格式中的w字段取出来，并且拼成结果串进行展示

1、从json数组中获取ws

2、ws是数组，数组元素为object

3、cw是数组，数组元素为object

4、w是string

5、从cw遍历获取w字段

解析代码：

func RecResultJsonToPlain() {
   var recResult string
   var dat map[string]interface{}
   json.Unmarshal([]byte(json_str), &dat)

if v, ok := dat["ws"]; ok {
       ws := v.([]interface{})
       for i, wsItem := range ws {
           wsMap := wsItem.(map[string]interface{})
           if vCw, ok := wsMap["cw"]; ok {
               cw := vCw.([]interface{})
               for i, cwItem := range cw {
                   cwItemMap := cwItem.(map[string]interface{})
                   if w, ok := cwItemMap["w"]; ok {
                       recResult = recResult + w.(string)
                   }
               }
           }
       }
   }
   fmt.Println(recResult)
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。如有错误或未考虑完全的地方，望不吝赐教。

来源：https://blog.csdn.net/github_39430096/article/details/102741661