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Go語言在寫HTTP服務程序時，會經常用到文件上傳和文件下載，文件上傳和文件下載都可以用http包，默認的功能基本上夠用了。http包支持文件下載的斷點續傳和進度顯示，文件上傳貌似不支持斷點續傳，不知道是不是要web端來實現。
然后我自己配合web端實現了大文件分片上傳，來完成斷點續傳和進度顯示的功能。
基本思想是，在web端將上傳的文件進行分片處理，然后向服務端發送上傳請求（UploadRequest）包括文件名，MD5，文件大小，和文件總片數。
然后開始一片一片的上傳（Upload）。如果暫停了或者斷網失敗了，就記錄當前上傳片的片數，下一次上傳，重發UploadRequest，chunkPos為續傳位置片數，然后從這個記錄的片數開始接著上傳（Upload）。在服務端，記錄首次請求的文件名，MD5，文件大小，文件總片數，然后開始接收每一片，將每一個片保存為一個單獨的文件，在接收完最后一個片時，將所有的分片份文件進行合并。保存為對應的文件名。最后再校驗MD5碼。
對于不同用戶的請求，將文件上傳的信息存儲到session中，當前文件上傳暫停后，上傳其它文件時，向session增加新文件的信息。暫停后，接著上傳最開始的文件，則直接從session中取得該文件的信息，包括文件名，上傳到某一個片的信息等。
服務端實現代碼：
func UploadRequest(w http.ResponseWriter, r *http.Request) {
?? ?log.WithFields(log.Fields{
?? ??? ?"HTTP": r.Method,
?? ??? ?"FUNC": "UploadRequest",
?? ?}).Info("HTTP REQUEST")
?? ?header := w.Header()
?? ?header.Add("Content-Type", "application/json")
?? ?/* session authentication */
?? ?sess := session.GlobalSessions.SessionCheck(w, r)
?? ?if sess == nil {
?? ??? ?log.Error("sess check error")
?? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "session check error")
?? ??? ?return
?? ?}
?? ?defer r.Body.Close()
?? ?con, _ := ioutil.ReadAll(r.Body) //獲取post的body數據
?? ?log.Info("UploadRequest json: ", string(con))
?? ?var uploadReq uploadRequest
?? ?err := json.Unmarshal([]byte(con), &uploadReq) /* 解析json字符串數據到結構體中 */
?? ?if err != nil {
?? ??? ?log.Error("json unmarshal error")
?? ??? ?fmt.Fprintf(w, config.FmtStr, "2000", "error", "json unmarshal error")
?? ??? ?return
?? ?}
?? ?switch uploadReq.Option {
?? ?case "reUploadFile":
?? ??? ?{
?? ??? ??? ?sess.Set("currentFile", uploadReq)
?? ??? ??? ?err := os.Remove("./tmp/" + uploadReq.FileName + "/" + uploadReq.FileName + "_" + uploadReq.ChunkPos)
?? ??? ??? ?if err != nil {
?? ??? ??? ??? ?log.Error(err)
?? ??? ??? ?}
?? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "1000", "success", "reupload request success")
?? ??? ?}
?? ?case "uploadFile":
?? ??? ?{
?? ??? ??? ?err = os.Mkdir("./tmp/"+uploadReq.FileName, 0777)
?? ??? ??? ?if err != nil {
?? ??? ??? ??? ?log.Info(err)
?? ??? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "mkdir error")
?? ??? ??? ?} else {
?? ??? ??? ??? ?log.Infof("create dir %s ok\r\n", uploadReq.FileName)
?? ??? ??? ?}
?? ??? ??? ?// 文件上傳信息保存，保存到session中，用于分片續傳時使用
?? ??? ??? ?sess.Set(uploadReq.FileName, uploadReq)
?? ??? ??? ?sess.Set("currentFile", uploadReq)
?? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "1000", "success", "upload request success")
?? ??? ?}
?? ?case "uploadCancel":
?? ??? ?{
?? ??? ??? ?err = os.RemoveAll("./tmp/" + uploadReq.FileName)
?? ??? ??? ?if err != nil {
?? ??? ??? ??? ?log.Fatal(err)
?? ??? ??? ?}
?? ??? ??? ?sess.Delete(uploadReq.FileName)
?? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "1000", "success", "upload file success")
?? ??? ??? ?return
?? ??? ?}
?? ?default:
?? ??? ?{
?? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "2000", "error", "upload request option error")
?? ??? ?}
?? ?}
}
/* 分片上傳功能實現 */
func Upload(w http.ResponseWriter, r *http.Request) {
?? ?log.WithFields(log.Fields{
?? ??? ?"HTTP": r.Method,
?? ??? ?"FUNC": "Upload",
?? ?}).Info("HTTP REQUEST")
?? ?header := w.Header()
?? ?header.Add("Content-Type", "application/json")
?? ?/* session authentication */
?? ?sess := globalSessions.SessionCheck(w, r) //session 檢查的接口封裝
?? ?if sess == nil {
?? ??? ?log.Error("session check failed")
?? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "session check failed")
?? ??? ?return
?? ?}
?? ?current_dir := sess.Get("current_dir")
?? ?log.Info("current dir: ", current_dir)
?? ?up_dir := sess.Get("up_dir")
?? ?log.Info("up_dir: ", up_dir)
?? ?// var current_dir string = "./river/test"
?? ?/* 表單上傳文件 */
?? ?if r.Method == "GET" {
?? ??? ?crutime := time.Now().Unix()
?? ??? ?h := md5.New()
?? ??? ?io.WriteString(h, strconv.FormatInt(crutime, 10))
?? ??? ?token := fmt.Sprintf("%x", h.Sum(nil))
?? ??? ?t, _ := template.ParseFiles("upload.gtpl")
?? ??? ?t.Execute(w, token)
?? ?} else {
?? ??? ?r.ParseMultipartForm(32 << 20)
?? ??? ?file, _, err := r.FormFile("uploadfile")
?? ??? ?if err != nil {
?? ??? ??? ?log.Error(err)
?? ??? ??? ?return
?? ??? ?}
?? ??? ?defer file.Close()
?? ??? ?var uploadFileInfo uploadRequest
?? ??? ?uploadFileInfo = sess.Get("currentFile").(uploadRequest)
?? ??? ?// fmt.Fprintf(w, "%v", sess.Get("fileName"))
?? ??? ?var fileName string = uploadFileInfo.FileName + "_" + uploadFileInfo.ChunkPos
?? ??? ?/* 判斷上傳的文件是否已經存在，可能發生同名的情況 */
?? ??? ?log.Debug("fileName: ", fileName)
?? ??? ?_, err = os.Stat("./tmp/" + uploadFileInfo.FileName + "/" + fileName)
?? ??? ?var f *os.File
?? ??? ?if err == nil {
?? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "file is exsited")
?? ??? ??? ?return
?? ??? ?} else {
?? ??? ??? ?f, err = os.OpenFile("./tmp/"+uploadFileInfo.FileName+"/"+fileName, os.O_WRONLY|os.O_CREATE, 0666) // 此處假設當前目錄下已存在test目錄
?? ??? ?}
?? ??? ?defer f.Close()
?? ??? ?if err != nil {
?? ??? ??? ?log.Error(err)
?? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "create file error")
?? ??? ??? ?return
?? ??? ?}
?? ??? ?io.Copy(f, file) //這里進行大文件copy會導致內存占用過大。一段時候后會進行GC回收
?? ??? ?log.Info("copy ok")
?? ??? ?// 判斷是否單個文件是否上傳完畢，上傳完畢則合并文件到目標文件夾
?? ??? ?if uploadFileInfo.ChunkPos == uploadFileInfo.ChunkNum {
?? ??? ??? ?f.Close()
?? ??? ??? ?_, err = os.Stat(current_dir.(string) + uploadFileInfo.FileName)
?? ??? ??? ?var fii *os.File
?? ??? ??? ?if err == nil {
?? ??? ??? ??? ?// 如果已經存在這個文件了，則在當前文件名后增加日期
?? ??? ??? ??? ?time := time.Now().Format("2006-01-02_15-04-05")
?? ??? ??? ??? ?log.Debug("Time: ", time)
?? ??? ??? ??? ?var fileName []byte = []byte(current_dir.(string) + uploadFileInfo.FileName)
?? ??? ??? ??? ?var fileNameFinal []byte = fileName
?? ??? ??? ??? ?log.Debug("file_name: ", string(fileName))
?? ??? ??? ??? ?var preFileName []byte
?? ??? ??? ??? ?var sufFileName []byte
?? ??? ??? ??? ?for i := len(fileName) - 1; i > 0; i-- {
?? ??? ??? ??? ??? ?if fileName[i] == '.' {
?? ??? ??? ??? ??? ??? ?preFileName = fileName[:i] // 文件名前綴 test
?? ??? ??? ??? ??? ??? ?sufFileName = fileName[i:] // 文件名后綴 .txt
?? ??? ??? ??? ??? ??? ?fileNameFinal = []byte(string(preFileName) + "_" + time + string(sufFileName))
?? ??? ??? ??? ??? ??? ?log.Info("fileNameFile: ", fileNameFinal)
?? ??? ??? ??? ??? ??? ?break
?? ??? ??? ??? ??? ?}
?? ??? ??? ??? ?}
?? ??? ??? ??? ?fii, err = os.OpenFile(string(fileNameFinal), os.O_WRONLY|os.O_CREATE, 0777) // 此處假設當前目錄下已存在test目錄
?? ??? ??? ?} else {
?? ??? ??? ??? ?fii, err = os.OpenFile(current_dir.(string)+uploadFileInfo.FileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, os.ModePerm)
?? ??? ??? ?}
?? ??? ??? ?defer fii.Close()
?? ??? ??? ?if err != nil {
?? ??? ??? ??? ?log.Error(err)
?? ??? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "Open object file error")
?? ??? ??? ??? ?return
?? ??? ??? ?}
?? ??? ??? ?index, _ := strconv.Atoi(uploadFileInfo.ChunkNum)
?? ??? ??? ?for i := 1; i <= index; i++ {
?? ??? ??? ??? ?f11, err := os.OpenFile("./tmp/"+uploadFileInfo.FileName+"/"+uploadFileInfo.FileName+"_"+strconv.Itoa(int(i)), os.O_RDONLY, os.ModePerm)
?? ??? ??? ??? ?if err != nil {
?? ??? ??? ??? ??? ?log.Error(err)
?? ??? ??? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "Open slice file error")
?? ??? ??? ??? ??? ?return
?? ??? ??? ??? ?}
?? ??? ??? ??? ?b, err := ioutil.ReadAll(f11)
?? ??? ??? ??? ?if err != nil {
?? ??? ??? ??? ??? ?log.Error(err)
?? ??? ??? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "ioutil readall error")
?? ??? ??? ??? ??? ?return
?? ??? ??? ??? ?}
?? ??? ??? ??? ?fii.Write(b)
?? ??? ??? ??? ?f11.Close()
?? ??? ??? ?}
?? ??? ??? ?err = os.RemoveAll("./tmp/" + uploadFileInfo.FileName)
?? ??? ??? ?if err != nil {
?? ??? ??? ??? ?log.Error(err)
?? ??? ??? ?}
?? ??? ??? ?sess.Delete(uploadFileInfo.FileName)
?? ??? ??? ?fii.Close()
?? ??? ??? ?if uploadFileInfo.MD5 == FileMD5(fii.Name()) {
?? ??? ??? ??? ?err := os.Remove(current_dir.(string) + fii.Name())
?? ??? ??? ??? ?if err != nil {
?? ??? ??? ??? ??? ?log.Error(err)
?? ??? ??? ??? ?}
?? ??? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "3000", "error", "upload file md5 error")
?? ??? ??? ?} else {
?? ??? ??? ??? ?fmt.Fprintf(w, config.FmtStr, "1000", "success", "upload one file all slice success")
?? ??? ??? ?}
?? ??? ??? ?return
?? ??? ?}
?? ??? ?chunkPos, err := strconv.Atoi(uploadFileInfo.ChunkPos)
?? ??? ?if err != nil {
?? ??? ??? ?log.Error(err)
?? ??? ?}
?? ??? ?uploadFileInfo.ChunkPos = strconv.Itoa(chunkPos + 1)
?? ??? ?sess.Set(uploadFileInfo.FileName, uploadFileInfo)
?? ??? ?sess.Set("currentFile", uploadFileInfo)
?? ??? ?fmt.Fprintf(w, config.FmtStr, "1000", "success", "upload file success")
?? ?}
}
func FileMD5(file string) string {
?? ?f, err := os.Open(file)
?? ?defer f.Close()
?? ?if err != nil {
?? ??? ?log.Info(err)
?? ??? ?return ""
?? ?}?? ?buffer, _ := ioutil.ReadAll(f)
?? ?data := buffer
?? ?has := md5.Sum(data)
?? ?md5str := fmt.Sprintf("%x", has)
?? ?return md5str
}原文鏈接：https://blog.csdn.net/duapple/article/details/109739491
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