golang学习之文件上传

caiyezi · · 1198 次点击 · · 开始浏览

这是一个创建于的文章，其中的信息可能已经有所发展或是发生改变。

首先是上传页面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>

文件上传代码：

package main import ( "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()) } }