Go Gin實現文件上傳下載的示例代碼

router.POST("/resources/common/upload", service.UploadResource)

data:{
    “saveDir”:“保存的路徑”，
    “fileName”:“文件名稱不帶後綴”
  }

// 上傳文件
func UploadResource(c *gin.Context) {
 saveDirParam := c.PostForm("saveDir")  // 文件目錄
 fileNameParam := c.PostForm("fileName") // 文件名稱
 //目錄
 var saveDir = ""
 //名稱
 var saveName = ""
 //完整路徑
 var savePath = ""
 //獲取文件
 file, header, errFile := c.Request.FormFile("file")
 //處理獲取文件錯誤
 if errFile != nil || common.IsEmpty(header.Filename) {
   c.JSON(http.StatusOK, gin.H{
     "success": false,
     "message": "請選擇文件",
     "dir":   saveDir,
     "name":  saveName,
     "path":  savePath,
   })
   return
 }
 //目錄請求參數為空
 if common.IsEmpty(saveDirParam) {
   c.JSON(http.StatusOK, gin.H{
     "success": false,
     "message": "請求參數錯誤！",
     "dir":   saveDir,
     "name":  saveName,
     "path":  savePath,
   })
   return
 }
 //如果上傳的名稱為空，則自動生成名稱
 if common.IsEmpty(fileNameParam) {
   fileNameParam = GenerateResourceNo()
 }
 //獲取上傳文件的後綴(類型)
 uploadFileNameWithSuffix := path.Base(header.Filename)
 uploadFileType := path.Ext(uploadFileNameWithSuffix)
 //文件保存目錄
 saveDir = "/attachment" + saveDirParam
 //保存的文件名稱
 saveName = fileNameParam + uploadFileType
 savePath = saveDir + "/" + saveName
 //打開目錄
 localFileInfo, fileStatErr := os.Stat(saveDir)
 //目錄不存在
 if fileStatErr != nil || !localFileInfo.IsDir() {
   //創建目錄
   errByMkdirAllDir := os.MkdirAll(saveDir, 0755)
   if errByMkdirAllDir != nil {
     logs.Error("%s mkdir error.....", saveDir, errByMkdirAllDir.Error())
     c.JSON(http.StatusOK, gin.H{
       "success": false,
       "dir":   saveDir,
       "name":  saveName,
       "path":  savePath,
       "message": "創建目錄失敗",
     })
     return
   }
 }
 ////上傳文件前 先刪除該資源之前上傳過的資源文件
 ////（編輯-重新選擇文件-需要先刪除該資源之前上傳過的資源文件）
  ////該代碼執行的條件----上傳的名稱是唯一的，否則會出現誤刪
 ////獲取文件的前綴
 //fileNameOnly := fileNameParam
 //deleteFileWithName(fileNameOnly, saveDir)
 //deleteFileWithName(fileNameOnly, model.WebConfig.ResourcePath+"/"+
 // model.WebConfig.WebConvertToPath)

 out, err := os.Create(savePath)
 if err != nil {
   logs.Error(err)
 }
 defer out.Close()
 _, err = io.Copy(out, file)
 if err != nil {
   c.JSON(http.StatusOK, gin.H{
     "success": false,
     "dir":   saveDir,
     "name":  saveName,
     "path":  savePath,
     "message": err.Error(),
   })
   return
 }

 //沒有錯誤的情況下
 c.JSON(http.StatusOK, gin.H{
   "success": true,
   "dir":   saveDir,
   "name":  saveName,
   "path":  savePath,
   "message": "上傳成功",
 })
 return
}

//上傳文件
    $.ajaxFileUpload(
      {
        url: '/resources/common/upload', //用於文件上傳的服務器端請求地址
        secureuri: false, //是否需要安全協議，一般設置為false
        fileElementId: fileUploadDomId, //文件上傳域的ID
        data: {
          "saveDir":fileSaveDir,
          "fileName":fileSaveName
        },
        dataType: 'json', //返回值類型 一般設置為json
        contentType:'application/json',//提交的數據類型
        async: false,
        success: function (data, status) //服務器成功響應處理函數
        {
          if (data.success){
            fileSaveName=fileSaveDir+"/"+data.name;
            console.log("上傳成功，返回的文件的路徑：",fileSaveName)
          }else{
            console.log("上傳失敗，返回的文件的路徑：",fileSaveName)
            return
          }
        },
        error: function (data, status, e)//服務器響應失敗處理函數
        {
          console.log("e==",e);
          return
        }
      }
    );

router.GET("/pub/common/download", service.PubResFileStreamGetService)

//下載次數
func UserFileDownloadCommonService(c *gin.Context) {
  filePath := c.Query("url")
 //打開文件
 fileTmp, errByOpenFile := os.Open(filePath)
 defer fileTmp.Close()
  
  //獲取文件的名稱
  fileName:=path.Base(filePath)
 if common.IsEmpty(filePath) || common.IsEmpty(fileName) || errByOpenFile != nil {
    logs.Error("獲取文件失敗")
   c.Redirect(http.StatusFound, "/404")
   return
 } 
 c.Header("Content-Type", "application/octet-stream")
   //強制瀏覽器下載
 c.Header("Content-Disposition", "attachment; filename="+fileName)
 //瀏覽器下載或預覽
 c.Header("Content-Disposition", "inline;filename="+fileName)
 c.Header("Content-Transfer-Encoding", "binary")
  c.Header("Cache-Control", "no-cache")

 c.File(filePath)
  return
}

router.GET("/pub/common/file_stream", service.PubResFileStreamGetService)

//map for Http Content-Type Http 文件類型對應的content-Type
var HttpContentType = map[string]string{
 ".avi": "video/avi",
 ".mp3": "  audio/mp3",
 ".mp4": "video/mp4",
 ".wmv": "  video/x-ms-wmv",
 ".asf": "video/x-ms-asf",
 ".rm":  "application/vnd.rn-realmedia",
 ".rmvb": "application/vnd.rn-realmedia-vbr",
 ".mov": "video/quicktime",
 ".m4v": "video/mp4",
 ".flv": "video/x-flv",
 ".jpg": "image/jpeg",
 ".png": "image/png",
}

//根據文件路徑讀取返回流文件 參數url
func PubResFileStreamGetService(c *gin.Context) {
filePath := c.Query("url")
//獲取文件名稱帶後綴
fileNameWithSuffix := path.Base(filePath)
//獲取文件的後綴
fileType := path.Ext(fileNameWithSuffix)
//獲取文件類型對應的http ContentType 類型
fileContentType := HttpContentType[fileType]
if common.IsEmpty(fileContentType) {
 c.String(http.StatusNotFound, "file http contentType not found")
 return
}
c.Header("Content-Type", fileContentType)
c.File(filePath)
}