Go言語で画像をアップロードするサイト
1834 ワード
package main
import (
"io"
"log"
"net/http"
"os"
)
/*
uploads
*/
const (
UPLOAD_DIR = "./uploads"
)
func uploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
io.WriteString(w, "<html><body><form method=\"POST\" action=\"/upload\" "+
" enctype=\"multipart/form-data\">"+
"Choose an image to upload: <input name=\"image\" type=\"file\" />"+
"<input type=\"submit\" value=\"Upload\" />"+
"</form></body></html>")
return
}
if r.Method == "POST" {
f, h, err := r.FormFile("image")
if err != nil {
http.Error(w, err.Error(),
http.StatusInternalServerError)
return
}
filename := h.Filename
defer f.Close()
t, err := os.Create(UPLOAD_DIR + "/" + filename)
if err != nil {
http.Error(w, err.Error(),
http.StatusInternalServerError)
return
}
defer t.Close()
if _, err := io.Copy(t, f); err != nil {
http.Error(w, err.Error(),
http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/view?id="+filename,
http.StatusFound)
}
}
func viewHandler(w http.ResponseWriter, r *http.Request) {
imageId := r.FormValue("id")
imagePath := UPLOAD_DIR + "/" + imageId
w.Header().Set("Content-Type", "image")
http.ServeFile(w, r, imagePath)
}
func main() {
http.HandleFunc("/view", viewHandler)
http.HandleFunc("/upload", uploadHandler)
err := http.ListenAndServe(":8080", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err.Error())
}
}