dongyang2229
2016-03-20 20:40 阅读 151

从golang中的json文件中读取切片

How do I read a slice from a json file in golang? For example, the file data.json looks like this:

["a","b","c","d"]

I have tried using ioutil.ReadFile to do this, but this returns a string, not a slice. How can I read my slice?
NOTE: You can sub the brackets [] for braces {}
I have done this using structs, but I don't want the user to have to type in this complicated json stuff

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1条回答 默认 最新

  • 已采纳
    douxiang3978 douxiang3978 2016-03-20 22:12

    For example,

    package main
    
    import (
        "encoding/json"
        "fmt"
        "io/ioutil"
    )
    
    func main() {
        data, err := ioutil.ReadFile("data.json")
        if err != nil {
            fmt.Println(err)
            return
        }
        fmt.Print("data:  ",string(data))
        var slice []string
        err = json.Unmarshal(data, &slice)
        if err != nil {
            fmt.Println(err)
            return
        }
        fmt.Printf("slice: %q
    ",slice)
    }
    

    Output:

    $ cat data.json
    ["a","b","c","d"]
    $ go run data.go
    data:  ["a","b","c","d"]
    slice: ["a" "b" "c" "d"]
    $
    
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