解组嵌套的JSON结构 [英] Unmarshal nested JSON structure

问题描述

http://play.golang.org/p/f6ilWnWTjm

我正在尝试解码以下字符串，但仅获取空值.

I am trying to decode the following string but only getting null values.

如何在Go中解码嵌套的JSON结构?

How do I decode nested JSON structure in Go?

我想将以下内容转换为地图数据结构.

I want to convert the following to map data structure.

package main

import (
  "encoding/json"
  "fmt"
)

func main() {
  jStr := `
{
    "AAA": {
        "assdfdff": ["asdf"],
        "fdsfa": ["1231", "123"]
    }
}
`
  type Container struct {
    Key string `json:"AAA"`
  }
  var cont Container

  json.Unmarshal([]byte(jStr), &cont)
  fmt.Println(cont)
}

推荐答案

在Go中使用嵌套结构以匹配JSON中的嵌套结构.

Use nested structs in Go to match the nested structure in JSON.

以下是如何处理示例JSON的一个示例:

Here's one example of how to handle your example JSON:

package main

import (
    "encoding/json"
    "fmt"
    "log"
)

func main() {
    jStr := `
    {
        "AAA": {
            "assdfdff": ["asdf"],
            "fdsfa": ["1231", "123"]
        }
    }
    `

    type Inner struct {
        Key2 []string `json:"assdfdff"`
        Key3 []string `json:"fdsfa"`
    }
    type Container struct {
        Key Inner `json:"AAA"`
    }
    var cont Container
    if err := json.Unmarshal([]byte(jStr), &cont); err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%+v\n", cont)
}

游乐场链接

您还可以对内部结构使用匿名类型:

You can also use an anonymous type for the inner struct:

type Container struct {
    Key struct {
        Key2 []string `json:"assdfdff"`
        Key3 []string `json:"fdsfa"`
    }  `json:"AAA"`
}

游乐场链接

或内部和外部结构:

var cont struct {
    Key struct {
        Key2 []string `json:"assdfdff"`
        Key3 []string `json:"fdsfa"`
    } `json:"AAA"`
}

游乐场链接

如果您不知道内部结构中的字段名称，请使用地图:

If you don't know the field names in the inner structure, then use a map:

type Container struct {
    Key map[string][]string `json:"AAA"`
}

http://play.golang.org/p/gwugHlCPLK

还有更多选择.希望这能使您走上正确的轨道.

There are more options. Hopefully this gets you on the right track.

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