Go语言高级特性总结——Struct、Map与JSON之间的转化

Struct与Map之间互相转换

// Struct2Map convert struct to map
func Struct2Map(st interface{}) map[string]interface{} {
    vt := reflect.TypeOf(st)
    vv := reflect.ValueOf(st)
    var data = make(map[string]interface{})
    for i := 0; i < vt.NumField(); i++ {
        f := vt.Field(i)
        v := vv.Field(i)
        chKey := f.Tag.Get("json")
        switch v.Kind() {
        case reflect.String:
            if s, ok := v.Interface().(string); ok && s != "" {
                data[chKey] = s
            }
        case reflect.Int:
            if i, ok := v.Interface().(int); ok && i != 0 {
                data[chKey] = i
            }
        case reflect.Struct:
            if t, ok := v.Interface().(time.Time); ok && t != (time.Time{}) {
                data[chKey] = t
            }
        case reflect.Uint64:
            if u64, ok := v.Interface().(uint64); ok && u64 != 0 {
                data[chKey] = u64
            }
        case reflect.Uint:
            if u, ok := v.Interface().(uint); ok && u != 0 {
                data[chKey] = u
            }
        default:
            log.Error("unsupport common query type: " + string(chKey))
        }
    }
    return data
}

JSON与Map之间的转换

// JSONString2Map convert struct to map
func JSONString2Map(str string) (map[string]string, error) {
    result := make(map[string]string)
    err := json.Unmarshal([]byte(str), &result)
    return result, err
}

Map与JSON之间的转换

// Map2JSON conver map to json
func Map2JSON(jsonmap map[string]string) (string, error) {
    jbytes, err := json.Marshal(jsonmap)
    return string(jbytes), err
}