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Go言語でJSONを返すシンプルなAPIサーバーを作るメモ

Last updated at Posted at 2015-06-09

このライブラリを使うといい感じに作れるみたいです。
https://github.com/ant0ine/go-json-rest

Golang初心者すぎるのでまずは動かすところから。

goのバージョン

こんな感じです。

$ go version
go version go1.4 darwin/amd64

コピペでJSONサーバー

go getコマンドでライブラリをダウンロードしておきます。

$ go get github.com/ant0ine/go-json-rest/rest

パッケージが$GOPATH/src以下に入っていることが確認できます。

$ ls $GOPATH/src/github.com/ant0ine
go-json-rest

APIpサーバープログラムを記述します。

api.go
package main

import (
    "github.com/ant0ine/go-json-rest/rest"
    "log"
    "net/http"
)

func main() {
    api := rest.NewApi()
    api.Use(rest.DefaultDevStack...)
    api.SetApp(rest.AppSimple(func(w rest.ResponseWriter, r *rest.Request) {
        w.WriteJson(map[string]string{"Body": "Hello World!"})
    }))
    log.Fatal(http.ListenAndServe(":8080", api.MakeHandler()))
}

実行

go runで実行できます。 localhost:8080にアクセスするとJSONが返ってきていることがわかるとおもいます。

$ go run api.go

09/Jun/2015:18:32:19 +0900 200 92μs "GET / HTTP/1.1" - "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36"

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