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()) } }