如何解组未知字段名称的JSON以构造 [英] How to unmarshal JSON with unknown fieldnames to struct

问题描述

是否可以解组未知字段的JSON?该字段名称始终是不同的，但是结构是相同的. JSON是POST请求的结果.

Is it possible to unmarshal JSON with unknown field? That field name is always different, but the structure is the same. JSON is a result of POST request.

我的代码:

package main

import "fmt"
import "encoding/json"

var body = []byte(`{
    "unknown_field": {
            "known_field_1": [[1,2,3,4,5],[10,20,30,40,50],[100,200,300,400,500]],
            "known_field_2": [[11,21,31,41,51]],
            "known_field_3": [[12,22,32,42,52],[14,44,34,44,54]]
        }
}`)

type MyStruct struct {
    MainData map[string]mData `json:"-"`
}

type mData struct {
    knownField1 [][5]int `json:"known_field_1"`
    knownField2 [][5]int `json:"known_field_2"`
    knownField3 [][5]int `json:"known_field_3"`
}

func NewMyStruct() MyStruct {
    ms := MyStruct{}
    ms.MainData = make(map[string]mData)
    return ms
}

func main() {
    myStruct := NewMyStruct()
    if err := json.Unmarshal(body, &myStruct); err != nil {
        panic(err)
    }

    fmt.Println(myStruct) // gives {map[]}
}

推荐答案

如果您不知道键，只需使用一个映射，并且映射的值类型可能是描述该结构的结构:

Simply use a map if you don't know the key, and the value type of the map may be the struct describing the structure:

type mData struct {
    KnownField1 [][5]int `json:"known_field_1"`
    KnownField2 [][5]int `json:"known_field_2"`
    KnownField3 [][5]int `json:"known_field_3"`
}

请注意，您必须导出字段才能使其正常工作！

Note that you must export the fields for this to work!

以及解编代码:

var data map[string]mData
if err := json.Unmarshal(body, &data); err != nil {
    panic(err)
}

fmt.Println(data)
for k, v := range data {
    fmt.Println(k, v)
}

输出(在游乐场上尝试):

map[unknown_field:{[[1 2 3 4 5] [10 20 30 40 50] [100 200 300 400 500]] [[11 21 31 41 51]] [[12 22 32 42 52] [14 44 34 44 54]]}]
unknown_field {[[1 2 3 4 5] [10 20 30 40 50] [100 200 300 400 500]] [[11 21 31 41 51]] [[12 22 32 42 52] [14 44 34 44 54]]}

查看相关问题:

如何解析/反动态化Golang中的JSON

将未知字段的JSON封送

JSON嵌套动态结构进行解码

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