映射到 JSON，但保留键顺序

Question

我有一个地图对象，当使用json.Marshal(myMapObjct)Golang 对其进行序列化时，它会按字母顺序对键进行排序，这会导致数据处理方式出现问题。将 JSON 结构创建为字节切片后，保留键顺序很重要。是否可以以这种方式对其进行序列化，或者我是否需要为这种特定的边缘情况编写自己的序列化程序？这是负责生成 JSON 结构的代码片段：// serializedTraffic wraps around naturalTraffic and serializes map to string.func serializedTraffic(payload string) (string, error) {    trafficMap := naturalTraffic(string(payload))    traffic, err := json.Marshal(trafficMap)    return string(traffic), err}    // naturalTraffic obfuscates 'payload' into JSON-like structure.func naturalTraffic(payload string) map[string]string {    // Decide on how many keys there will be in the JSON structure.    indexChar := 0    maxChars := 126    minChars := 16    var jsonObject = make(map[string]string)    // Build the JSON structure.    for indexChar < len(payload) {        rand.Seed(time.Now().UnixNano())        chunkSize := rand.Intn(maxChars-minChars) + minChars        if len(payload) < indexChar+chunkSize {            chunkSize = len(payload) - indexChar        }        key := randomPopularWord()        jsonObject[key] = base64.StdEncoding.EncodeToString([]byte(payload[indexChar : indexChar+chunkSize]))        indexChar += chunkSize    }    return jsonObject}

Answer 1

根据建议，我提供了一种不同的结构来修复代码。

    type elem struct{ key, val string }

    type object []elem

    func (o object) MarshalJSON() (out []byte, err error) {

        if o == nil {

            return []byte(`null`), nil

        }

        if len(o) == 0 {

            return []byte(`{}`), nil

        }

        out = append(out, '{')

        for _, e := range o {

            key, err := json.Marshal(e.key)

            if err != nil {

                return nil, err

            }

            val, err := json.Marshal(e.val)

            if err != nil {

                return nil, err

            }

            out = append(out, key...)

            out = append(out, ':')

            out = append(out, val...)

            out = append(out, ',')

        }

        // replace last ',' with '}'

        out[len(out)-1] = '}'

        return out, nil

    }

    // serializedTraffic wraps around naturalTraffic and serializes map to string.

    func serializedTraffic(payload string) (string, error) {

        trafficMap := naturalTraffic(string(payload))

        traffic, err := trafficMap.MarshalJSON()

        return string(traffic), err

    }

    // naturalTraffic obfuscates 'payload' into JSON-like structure.

    func naturalTraffic(payload string) object {

        // Decide on how many keys there will be in the JSON structure.

        indexChar := 0

        maxChars := 126

        minChars := 16

        var jsonObject object

        // Build the JSON structure.

        for indexChar < len(payload) {

            rand.Seed(time.Now().UnixNano())

            chunkSize := rand.Intn(maxChars-minChars) + minChars

            if len(payload) < indexChar+chunkSize {

                chunkSize = len(payload) - indexChar

            }

            key := randomPopularWord()

            jsonObject = append(jsonObject, elem{

                key: key,

                val: base64.StdEncoding.EncodeToString([]byte(payload[indexChar : indexChar+chunkSize])),

            })

            indexChar += chunkSize

        }

        return jsonObject

    }