如何在 Go 中解析 JSON 数组 [英] How to parse JSON array in Go

问题描述

如何使用 json 包在 Go 中解析字符串(即数组)?

How to parse a string (which is an array) in Go using json package?

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)
}

推荐答案

返回值<Unmarshal 的/a> 是一个 error，这是您正在打印的内容:

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

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

你也可以去掉 JsonType 并且只使用一个切片:

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]

播放代码:https://play.golang.org/p/GNWlylavam

背景:传入指针允许 Unmarshal 减少(或完全摆脱)内存分配.此外，在处理上下文中，调用者可能会重复使用相同的值 - 也可以节省分配.

Background: Passing in a pointer allows Unmarshal to reduce (or get entirely rid of) memory allocations. Also, in a processing context, the caller may reuse the same value to repeatedly - saving allocations as well.

这篇关于如何在 Go 中解析 JSON 数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！