文件的上传下载

将文件转换成二进制保存到数据库。

protected void btnUpload_Click(object sender, EventArgs e)
        {
            string FileUploadPath = "../../Upload";
            HiddenSysNew.Value = "";
            List<SystemChangeFile> list = new List<SystemChangeFile>();

            System.Web.HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;
            System.Text.StringBuilder strmsg = new System.Text.StringBuilder("");
            string[] rd = Request.Form[1].Split(',');//获得图片描述的文本框字符串数组，为对应的图片的描述
            int ifile;
            int num = 0;
            for (ifile = 0; ifile < files.Count; ifile++)
            {
                if (files[ifile].FileName.Length > 0)
                {
                    System.Web.HttpPostedFile postedfile = files[ifile];
                    if (postedfile.ContentLength / 1024 > 1024 * 40)//单个文件不能大于1024*10k
                    {
                        strmsg.Append(Path.GetFileName(postedfile.FileName) + "---不能大于40M<br>");
                        break;
                    }
                    //string fex = Path.GetExtension(postedfile.FileName).ToUpper();
                    //if (fex != ".DOC" && fex != ".DOCX" && fex != ".XLSX" && fex != ".XLS" && fex != ".JPG")
                    //{
                    //    strmsg.Append(Path.GetFileName(postedfile.FileName) + "---文件格式不正确");
                    //    break;
                    //}
                    num = num + 1;
                }
            }
            //文件格式不对
            if (!string.IsNullOrEmpty(strmsg.ToString()))
            {
                ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('" + strmsg + "！');</script>");
                return;
            }
            if (num <= 0)
            {
                ClientScript.RegisterStartupScript(this.GetType(), "", "<script>AlertAndNewLoad('没有上传文件！');</script>");
                return;
            }

            if (strmsg.Length <= 0)//说明图片大小和格式都没问题
            {
                //以下为创建图库目录

                string dirpath = Server.MapPath(FileUploadPath);

                if (Directory.Exists(dirpath) == false)
                {
                    Directory.CreateDirectory(dirpath);
                }
                Random ro = new Random();
                int name = 1;
                for (int i = 0; i < files.Count; i++)
                {
                    System.Web.HttpPostedFile myFile = files[i];
                    string FileName = "";
                    string FileExtention = "";
                    FileName = System.IO.Path.GetFileName(myFile.FileName);
                    string stro = ro.Next(100, 100000000).ToString() + name.ToString();//产生一个随机数用于新命名的图片
                    string NewName = DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + stro;
                    string ppath = "";


                    if (FileName.Length > 0)//有文件才执行上传操作再保存到数据库
                    {
                        Stream fileStream = files[i].InputStream;      //用于读取上传的数据
                        FileExtention = System.IO.Path.GetExtension(myFile.FileName);
                        ppath = dirpath + @"\" + NewName + FileExtention;
                        //myFile.SaveAs(ppath);
                        Guid FileId = Guid.NewGuid();
                        int strFileLen = FileName.Length;//获取文件的大小
                        SystemChangeFile def = new SystemChangeFile();
                        def.FileId = FileId;
                        def.FileName = FileName;
                        def.FileDesc = rd[i];
                        //def.FilePath = FileUploadPath + "/" + NewName + FileExtention;
                        if (!string.IsNullOrEmpty(HfType.Value.Trim()))
                        {
                            def.ErpType = int.Parse(HfType.Value.Trim());
                        }
                        byte[] filebuffer = new byte[strFileLen];       //准备一个和文件大小一样的缓存 
                        BinaryReader br = new BinaryReader((Stream)fileStream);
                        filebuffer = br.ReadBytes((int)fileStream.Length);
                        def.FileType = files[i].ContentType;
                        def.FileContent = filebuffer;
                        list.Add(def);
                        HiddenSysNew.Value += ReturnTr(def);

                    }
                    name = name + 1;//用来重命名规则的变量

                }
                new Biz.Biz_SystemChanges().AddFile(list);
                ClientScript.RegisterStartupScript(this.GetType(), "", "<script>AlertAndNewLoad('上传成功！');</script>");
            }


        }

 

文件的下载

#region 下载附件
        /// <summary>
        /// 下载附件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void BtnDownFile_Click(object sender, EventArgs e)
        {
            Guid d;
            if (Guid.TryParse(HFileValue4.Value.Trim(), out d))
            {
                SystemChangeFile def = Biz_SystemChanges.Biz_SystemChanges.Biz_QuerySystemRightFile(new SystemChangeFile()
                {
                    FileId = d
                }).First();
                Byte[] fileBytes = def.FileContent;
                Response.Buffer = true;
                Response.ClearContent();
                Response.ClearHeaders();
                //指定http名称和值 
                Response.AddHeader("content-disposition", "attachment; filename=" + HttpUtility.UrlEncode(def.FileName, System.Text.Encoding.UTF8));
                //指定文件类型
                Response.ContentType = "application/octet-stream";
                //Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
                Response.BinaryWrite(fileBytes);
                Response.Flush();
                Response.End();
            }
        }

　　

 public void DownFile(string path)
        {
            string strFile = string.Format(@"{0}", path);

            using (FileStream fs = new FileStream(strFile, FileMode.Open))
            {
                byte[] bytes = new byte[(int)fs.Length];
                fs.Read(bytes, 0, bytes.Length);
                fs.Close();
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("data.xml", System.Text.Encoding.UTF8));
                Response.BinaryWrite(bytes);
                Response.Flush();
                Response.End();
            }
        }

 

#endregion