dsf12313
2012-02-26 12:05
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如何在Golang中将类型从字符串转换为float64解码JSON?

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

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

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)
    }
}

When I run it, get the result:

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

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

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4条回答 默认 最新

  • duanchun1852 2012-03-05 21:01
    最佳回答

    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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