asp.net上传下载

HttpCookie getcookie = Request.Cookies["newcookie"];
string terminal = getcookie.Values["id"];
//文件上传 2011-12-24
            Boolean fileOK = false;
            DateTime now = DateTime.Now;
string UserDirectory = now.Year.ToString() + "-" + now.Month.ToString() + "-" + now.Day.ToString();
//DateTime.Now.ToString("yyyyMMdd");
//string UserDirectory = DateTime.Now.ToShortTimeString().ToString();//所要创建文件夹的名字，实际运用中可为用户注册ID
            string Path = Server.MapPath("~/Pic").ToString() + "\\" + UserDirectory+"\\";
if (!Directory.Exists(Path)) //如果文件夹不存在则创建
            {
                Directory.CreateDirectory(Path);
            }
            Random rd = new Random();//产生随机数

string UpLoadFileTime = DateTime.Now.ToString("yyyyMMddHHmmss") + terminal+"_1";//得到系统时间并加上随机数以便生成上传图片名称
//string NewUploadFileName = UpLoadFileTime + FileUpload1.FileName;//产生上传图片的名称
            string NewUploadFileName = UpLoadFileTime + System.IO.Path.GetExtension(FileUpload1.FileName).ToLower(); ;//产生上传图片的名称(lin)
            if (FileUpload1.HasFile)
            {
                String fileExtension =
                    System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
                String[] allowedExtensions = 
                { ".gif", ".png", ".jpeg", ".jpg" };
for (int i = 0; i < allowedExtensions.Length; i++)
                {
if (fileExtension == allowedExtensions[i])
                    {
                        fileOK = true;
                    }
                }
            }

if (fileOK)
            {
try
                {
                    FileUpload1.PostedFile.SaveAs(Path
                        + NewUploadFileName);
                    Label1.Text = "文件上传成功!";
                }
catch (Exception ex)
                {
                    Label1.Text = "文件不能上传.";
                }
            }
else
            {
                Label1.Text = "不能接受这种文件类型。";
            }

//文件上传 2011-12-24
            Boolean fileOK2 = false;
//String path2 = Server.MapPath("~/Pic/");  //设置服务器上传的路径，即文件上传的位置
            String path2=Server.MapPath("~/Pic").ToString() + "\\" + UserDirectory + "\\";

string UpLoadFileTime2 = DateTime.Now.ToString("yyyyMMddHHmmss") + terminal + "_2";//得到系统时间并加上随机数以便生成上传图片名称
//string NewUploadFileName2 = UpLoadFileTime2 + FileUpload2.FileName;//产生上传图片的名称
            string NewUploadFileName2 = UpLoadFileTime2 + System.IO.Path.GetExtension(FileUpload2.FileName).ToLower(); ;//产生上传图片的名称(lin)
            if (FileUpload2.HasFile)
            {
                String fileExtension =
                    System.IO.Path.GetExtension(FileUpload2.FileName).ToLower();
                String[] allowedExtensions = 
                { ".gif", ".png", ".jpeg", ".jpg" };
for (int i = 0; i < allowedExtensions.Length; i++)
                {
if (fileExtension == allowedExtensions[i])
                    {
                        fileOK = true;
                    }
                }
            }

if (fileOK)
            {
try
                {
                    FileUpload2.PostedFile.SaveAs(path2
                        + NewUploadFileName2);
                    Label2.Text = "文件上传成功!";
                }
catch (Exception ex)
                {
                    Label2.Text = "文件不能上传.";
                }
            }
else
            {
                Label2.Text = "不能接受这种文件类型。";
            }

前台是asp.net的控件！

服务器端下载的时候：HyperLink1.NavigateUrl = 数据库里面的字段值；        HyperLink2.NavigateUrl = 数据库里面的字段值！

如果知道位置：

/*using System.IO;*/
        SqlConnection conn = new SqlConnection("server=192.168.3.130;database=kaifashujuku;uid=kaifayonghu;pwd=123456;");
        SqlDataAdapter sda = new SqlDataAdapter("select * from t_provisional_sale where id=40028", conn);
        DataSet myds = new DataSet();
        sda.Fill(myds, "tb_terminal");
string str_filename = myds.Tables[0].Rows[0].ItemArray[13].ToString();
//Response.ContentType = "application/x-zip-compressed";
//Response.AddHeader("Content-Disposition", "attachment;filename='" + str_filename + "'");
//string filename = Server.MapPath("~/images/" + str_filename + "");绝对路径不能成功！
        DateTime now = DateTime.Now;
string UserDirectory = now.Year.ToString() + "-" + now.Month.ToString() + "-" + now.Day.ToString();
string filename = "E://client//Pic//"+UserDirectory+"//" +str_filename + "";
//Response.TransmitFile(filename);
        System.IO.FileStream r = new System.IO.FileStream(filename, System.IO.FileMode.Open); 
//设置基本信息 
        Response.Buffer = false; 
        Response.AddHeader("Connection", "Keep-Alive"); 
        Response.ContentType = "application/octet-stream";
        Response.AddHeader("Content-Disposition", "attachment;filename=" + System.IO.Path.GetFileName(filename)); 
        Response.AddHeader("Content-Length", r.Length.ToString()); 
while (true) 
        { 
//开辟缓冲区空间 
        byte[] buffer = new byte[1024]; 
//读取文件的数据 
        int leng = r.Read(buffer, 0, 1024); 
if (leng == 0)//到文件尾，结束 
        break; 
if (leng == 1024)//读出的文件数据长度等于缓冲区长度，直接将缓冲区数据写入 
        Response.BinaryWrite(buffer); 
else 
        { 
//读出文件数据比缓冲区小，重新定义缓冲区大小，只用于读取文件的最后一个数据块 
        byte[] b = new byte[leng]; 
for (int i = 0; i < leng; i++) 
        b[i] = buffer[i]; 
        Response.BinaryWrite(b); 
        } 
        } 
        r.Close();//关闭下载文件 
        Response.End();//结束文件下载
        }

 

转载于:https://www.cnblogs.com/daywrite/archive/2011/12/27/2303741.html