Golang 实现interface类型转string类型

// 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 stringif 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{}

{'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

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)}

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