如何解码类型为从字符串转换为 float64 的 JSON [英] How to decode JSON with type convert from string to float64

问题描述

我需要解码一个带有浮点数的 JSON 字符串，例如:

I need to decode a JSON string with the float number like:

{"name":"Galaxy Nexus", "price":"3460.00"}

我使用下面的 Golang 代码:

I use the Golang code below:

package main

import (
    "encoding/json"
    "fmt"
)

type Product struct {
    Name  string
    Price float64
}

func main() {
    s := `{"name":"Galaxy Nexus", "price":"3460.00"}`
    var pro Product
    err := json.Unmarshal([]byte(s), &pro)
    if err == nil {
        fmt.Printf("%+v
", pro)
    } else {
        fmt.Println(err)
        fmt.Printf("%+v
", pro)
    }
}

当我运行它时，得到结果:

When I run it, get the result:

json: cannot unmarshal string into Go value of type float64
{Name:Galaxy Nexus Price:0}

我想知道如何使用类型转换来解码 JSON 字符串.

I want to know how to decode the JSON string with type convert.

推荐答案

答案要简单得多.只需添加告诉 JSON interpeter 这是一个带有 ,string 的字符串编码的 float64(请注意，我只更改了 Price 定义):

The answer is considerably less complicated. Just add tell the JSON interpeter it's a string encoded float64 with ,string (note that I only changed the Price definition):

package main

import (
    "encoding/json"
    "fmt"
)

type Product struct {
    Name  string
    Price float64 `json:",string"`
}

func main() {
    s := `{"name":"Galaxy Nexus", "price":"3460.00"}`
    var pro Product
    err := json.Unmarshal([]byte(s), &pro)
    if err == nil {
        fmt.Printf("%+v
", pro)
    } else {
        fmt.Println(err)
        fmt.Printf("%+v
", pro)
    }
}

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