如何解组转义的JSON字符串 [英] How to unmarshal an escaped JSON string

问题描述

我在Go中使用Sockjs，但是当JavaScript客户端将json发送到服务器时，它将转义它，并以[] byte的形式发送它.我试图弄清楚如何解析json，以便我可以读取数据.但我收到此错误.

I am using Sockjs with Go, but when the JavaScript client send json to the server it escapes it, and send's it as a []byte. I'm trying to figure out how to parse the json, so that i can read the data. but I get this error.

json:无法将字符串解组为main.Msg类型的Go值

json: cannot unmarshal string into Go value of type main.Msg

我该如何解决? html.UnescapeString()无效.

val, err := session.ReadMessage()
if err != nil {
break
}
var msg Msg

err = json.Unmarshal(val, &msg)

fmt.Printf("%v", val)
fmt.Printf("%v", err)

type Msg struct {
    Channel string
    Name    string
    Msg     string
}

//Output
"{\"channel\":\"buu\",\"name\":\"john\", \"msg\":\"doe\"}"
json: cannot unmarshal string into Go value of type main.Msg

推荐答案

您可能想使用 strconv.Unquote :)

You might want to use strconv.Unquote on your JSON string first :)

这是一个示例，由@gregghz提供:

Here's an example, kindly provided by @gregghz:

package main

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

type Msg struct {
    Channel string
    Name string
    Msg string
}

func main() {
    var msg Msg
    var val []byte = []byte(`"{\"channel\":\"buu\",\"name\":\"john\", \"msg\":\"doe\"}"`)

    s, _ := strconv.Unquote(string(val))

    err := json.Unmarshal([]byte(s), &msg)

    fmt.Println(s)
    fmt.Println(err)
    fmt.Println(msg.Channel, msg.Name, msg.Msg)
}

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