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Golangでwebアップローダーを作る

Last updated at Posted at 2020-03-15

とりあえず作成したので、アップロード
https://github.com/karosuwindam/goupload

重要部分を抜き出し
アップロードの関数部分

upload.go
package main
import (
	"fmt"
	"net/http"
	"os"

)

const UPLOAD = "upload"

func upload(w http.ResponseWriter, r *http.Request) {
	var data []byte = make([]byte, 1024)
	var tmplength int64 = 0
	var output string
	urldata := ""
	searchdata := ""
	if r.Method == "POST" {
		file, fileHeader, e := r.FormFile("file")
		if e != nil {
			fmt.Fprintf(w, "アップロードに失敗しました。")
			return
		}
		writefilename := fileHeader.Filename
		fp, err := os.Create(UPLOAD + "/" + writefilename)
		if err != nil {
		}
		defer fp.Close()
		defer file.Close()
		for {
			n, e := file.Read(data)
			if n == 0 {
				break
			}
			if e != nil {
				return
			}
			fp.WriteAt(data, tmplength)
			tmplength += int64(n)
		}
		fmt.Printf("POST\n")
	} else {
		fmt.Printf("GET\n")
                fmt.Fprintf(w, "GET読み込み")
		return
	}
	fmt.Fprintf(w, "ファイルアップロード")
}

サーバのスタート部分

main.go
package main

import (
	"net/http"
	"fmt"
)

const Port = "8080"
const Ipdata = ""


func webstart() {
	http.HandleFunc("/upload/", upload)
	http.Handle("/", http.StripPrefix("/", http.FileServer(http.Dir("./html"))))
	http.ListenAndServe(Ipdata+":"+Port, nil)
}

func main() {
	fmt.Printf("%v:%v Webserver start\n", Ipdata, Port)
	webstart()
}

index部分ファイルアップロードはブラウザのPOST命令に任せる

index.html
<html>
    <head>
        <title>upload</title>
    </head>
    <body>
        <form action="/upload/" method="post" enctype="multipart/form-data">
        <input type="file" name="file" id="up_loadfile" multiple="multiple">
        <input type="submit" value="send">
        </form>
    </body>
</html>

メモ書き程度なので、githubのアップロードファイルをビルドした方が多機能かも

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