doudou3213 2019-06-19 10:31
浏览 125
已采纳

运行JSON Encode时是否可以排除已经为JSON的字段?

I am constructing a reply on a restAPI and using json.NewEncoder.Encode() to generate the JSON reply ( note : w is responsewriter).

u := Reply{Id: id, Status: "progress", Message: ""}
json.NewEncoder(w).Encode(u)

This works fine.

But I then have the other situation where Message will be populated with a string that is already in JSON format:

RetMessage := "{"debug": "on", "window": { "width": 500, "height": 500}}"
u := Reply{Id: id, Status: "progress", Message: RetMessage}
json.NewEncoder(w).Encode(u)

Then the reply will be the JSON with escaped quotations etc, which makes sense of course as it parses it as strings to JSON, but it of course breaks the concept as I would like the RetMessage to be passed on as it is, where the others I would like to be encoded to JSON.

Is there any way I can get around this in a smart way? The content in RetMessage is coming from a file so I can't change that the RetMessage sometimes do come as JSON encoded already.

  • 写回答

2条回答 默认 最新

  • duanchen7036 2019-06-19 11:17
    关注

    If Message is a complete, valid, JSON object, you can accomplish what you want by converting it to type json.RawMessage:

    type ReplyWithJSON struct {
        Id      int
        Status  string
        Message json.RawMessage
    }
    
    u := ReplyWithJSON{Id: id, Status: "progress", Message: json.RawMessage(RetMessage)}
    json.NewEncoder(w).Encode(u)
    

    This should generate the following output:

    {"Id":123,"Status":"progress","Message":{"debug":"on","window":{"width":500,"height":500}}}

    See it in action on the playground.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)
编辑
预览

报告相同问题?

手机看
程序员都在用的中文IT技术交流社区

程序员都在用的中文IT技术交流社区

专业的中文 IT 技术社区,与千万技术人共成长

专业的中文 IT 技术社区,与千万技术人共成长

关注【CSDN】视频号,行业资讯、技术分享精彩不断,直播好礼送不停!

关注【CSDN】视频号,行业资讯、技术分享精彩不断,直播好礼送不停!

客服 返回
顶部