golang檔案上傳

來源:互聯網
上載者:User
這是一個建立於 的文章,其中的資訊可能已經有所發展或是發生改變。

首先是上傳頁面upload.html:

<!doctype html><html><head><meta charset="utf-8"><title>Upload</title></head><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>

檔案上傳代碼:

package mainimport (    "html/template"    "io"    "log"    "net/http"    "os")const (    UPLOAD_DIR = "./uploads")func uploadHandler(w http.ResponseWriter, r *http.Request) {    if r.Method == "GET" {        t, err := template.ParseFiles("upload.html")        if err != nil {            http.Error(w, err.Error(), http.StatusInternalServerError)            return        }        t.Execute(w, nil)        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    if exists := isExists(imagePath); !exists {        http.NotFound(w, r)        return    }    w.Header().Set("Content-Type", "image")    http.ServeFile(w, r, imagePath)}func isExists(path string) bool {    _, err := os.Stat(path)    if err == nil {        return true    }    return os.IsExist(err)}func main() {    http.HandleFunc("/view", viewHandler)    http.HandleFunc("/upload", uploadHandler)    err := http.ListenAndServe(":8080", nil)    if err != nil {        log.Fatal("ListenAndServe: ", err.Error())    }}

 

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