我在访问上传w / golang的文件时遇到问题。我对这门语言很陌生并经历过多次尝试 - 无法在网上找到任何答案。
我做错了什么?在这段代码中,我从未到过列出上传文件数量的块。
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Println("handling req...")
if r.Method =="GET"{
fmt.Println("GET req...")
} else {
//parse the multipart stuff if there
err := r.ParseMultipartForm(15485760)
//
if err == nil{
form:=r.MultipartForm
if form==nil {
fmt.Println("no files...")
} else {
defer form.RemoveAll()
// i never see this actually occur
fmt.Printf("%d files",len(form.File))
}
} else {
http.Error(w,err.Error(),http.StatusInternalServerError)
fmt.Println(err.Error())
}
}
//fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
fmt.Println("leaving...")
}
我能够让上面的代码工作。哪个好。下面的答案显示了如何进行异步,这可能是比我更好的代码示例。
答案 0 :(得分:10)
回答 下载最新的golang版本。
我之前遇到过这个问题,使用旧的golang版本,我不知道发生了什么,但是最新的golang正在运行。 =)
我的上传处理程序代码如下...... 完整代码:http://noypi-linux.blogspot.com/2014/07/golang-web-server-basic-operatons-using.html
// parse request
const _24K = (1 << 10) * 24
if err = req.ParseMultipartForm(_24K); nil != err {
status = http.StatusInternalServerError
return
}
for _, fheaders := range req.MultipartForm.File {
for _, hdr := range fheaders {
// open uploaded
var infile multipart.File
if infile, err = hdr.Open(); nil != err {
status = http.StatusInternalServerError
return
}
// open destination
var outfile *os.File
if outfile, err = os.Create("./uploaded/" + hdr.Filename); nil != err {
status = http.StatusInternalServerError
return
}
// 32K buffer copy
var written int64
if written, err = io.Copy(outfile, infile); nil != err {
status = http.StatusInternalServerError
return
}
res.Write([]byte("uploaded file:" + hdr.Filename + ";length:" + strconv.Itoa(int(written))))
}
}
答案 1 :(得分:4)
如果你知道文件上传的密钥,你可以让它更简单一些(我没想过):
infile, header, err := r.FormFile("file")
if err != nil {
http.Error(w, "Error parsing uploaded file: "+err.Error(), http.StatusBadRequest)
return
}
// THIS IS VERY INSECURE! DO NOT DO THIS!
outfile, err := os.Create("./uploaded/" + header.Filename)
if err != nil {
http.Error(w, "Error saving file: "+err.Error(), http.StatusBadRequest)
return
}
_, err = io.Copy(outfile, infile)
if err != nil {
http.Error(w, "Error saving file: "+err.Error(), http.StatusBadRequest)
return
}
fmt.Fprintln(w, "Ok")