how to serialize/deserialize a map in go

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问题内容

My instinct tells me that somehow it would have to be converted to a string or byte[] (which might even be the same things in Go?) and then saved to disk.

I found this package (http://golang.org/pkg/encoding/gob/), but it seems like its just for structs?

正确答案

There are multiple ways of serializing data, and Go offers many packages for this. Packages for some of the common ways of encoding:

encoding/gob
encoding/xml
encoding/json

encoding/gob handles maps fine. The example below shows both encoding/decoding of a map:

    package main

import (
    "fmt"
    "encoding/gob"
    "bytes"
)

var m = map[string]int{"one":1, "two":2, "three":3}

func main() {
    b := new(bytes.Buffer)

    e := gob.NewEncoder(b)

    // Encoding the map
    err := e.Encode(m)
    if err != nil {
        panic(err)
    }

    var decodedMap map[string]int
    d := gob.NewDecoder(b)

    // Decoding the serialized data
    err = d.Decode(&decodedMap)
    if err != nil {
        panic(err)
    }

    // Ta da! It is a map!
    fmt.Printf("%#v\n", decodedMap)
}

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