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

问题描述

我需要使用以下浮点数对JSON字符串进行解码:

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\n", pro)
    } else {
        fmt.Println(err)
        fmt.Printf("%+v\n", 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convert类型的JSON字符串进行解码.

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

推荐答案

答案不那么复杂.只需添加告诉JSON中介程序，它是一个用,string编码的float64字符串(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\n", pro)
    } else {
        fmt.Println(err)
        fmt.Printf("%+v\n", pro)
    }
}

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