duan00529 2016-08-10 08:11 采纳率: 100%
浏览 2022
已采纳

如何在 Golang 中解析 JSON 数组?

一个简单的问题:如何使用json包解析Go中的字符串(这是一个数组)?

type JsonType struct{
    Array []string
}

func main(){
    dataJson = `["1","2","3"]`
    arr := JsonType{}
    unmarshaled := json.Unmarshal([]byte(dataJson), &arr.Array)
    log.Printf("Unmarshaled: %v", unmarshaled)
}
  • 写回答

2条回答 默认 最新

  • douyan4958 2016-08-10 08:18
    关注

    The return value of Unmarshal is an err, and this is what you are printing out:

    // Return value type of Unmarshal is error.
    err := json.Unmarshal([]byte(dataJson), &arr)
    

    You can get rid of the JsonType as well and just use a slice:

    package main
    
    import (
        "encoding/json"
        "log"
    )
    
    func main() {
        dataJson := `["1","2","3"]`
        var arr []string
        _ = json.Unmarshal([]byte(dataJson), &arr)
        log.Printf("Unmarshaled: %v", arr)
    }
    
    // prints out:
    // 2009/11/10 23:00:00 Unmarshaled: [1 2 3]
    

    Code on play: https://play.golang.org/p/GNWlylavam

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
  • dsjuimtq920056 2016-08-10 08:16
    关注

    Note: This answer was written before the question was edited. In the original question &arr was passed to json.Unmarshal():

    unmarshaled := json.Unmarshal([]byte(dataJson), &arr)
    

    You pass the address of arr to json.Unmarshal() to unmarshal a JSON array, but arr is not an array (or slice), it is a struct value.

    Arrays can be unmarshaled into Go arrays or slices. So pass arr.Array:

    dataJson := `["1","2","3"]`
    arr := JsonType{}
    err := json.Unmarshal([]byte(dataJson), &arr.Array)
    log.Printf("Unmarshaled: %v, error: %v", arr.Array, err)
    

    Output (try it on the Go Playground):

    2009/11/10 23:00:00 Unmarshaled: [1 2 3], error: <nil>
    

    Of course you don't even need the JsonType wrapper, just use a simple []string slice:

    dataJson := `["1","2","3"]`
    var s []string
    err := json.Unmarshal([]byte(dataJson), &s)
    
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 我现在有一些关于提升机故障的专有文本数据,量也不多,我在label studio上进行了关系和实体的标注,完成了知识图谱的构造,那么我使用生成式模型的话,我能做哪些工作来写我的论文?
  • ¥15 电脑连不上无线网络如下诊断反馈应该如何操作
  • ¥15 telegram api 使用forward_messages方法转发消息时,目标群组里面会出现此消息来源,如何隐藏?
  • ¥15 在ubuntu中无法连接到远程服务器传输文件
  • ¥15 关于#tensorflow#的问题:有没有什么方法可以让机器自己学会像素风格的图片
  • ¥15 Oracle触发器字段变化时插入指定值
  • ¥15 docker无法进入容器内部
  • ¥15 qt https 依赖openssl 静态库
  • ¥15 python flask 报错
  • ¥15 改个密码引发的项目启动问题