客户端文件下载

Question

我想在vs2005上做一个客户端文件下载功能我需要用什么控件来实现此功能啊！

Answer 1

上传  FileUpload控件 保存路径========文件上传===============================================
protected void Button1_Click(object sender, EventArgs e)
    {
        Boolean fileOk = false;
//获取文件物理路径
        string path = Server.MapPath("~/Account/");
//判断是否选择文件
        if (FileUpload1.HasFile)
        {
    //取得文件扩展名 
            string exName = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
    //限定文件类型
            string[] allowExtn = { ".jpg", ".txt", ".gif" };
            //对上传的文件的类型进行一个个匹对
            for (int i = 0; i < allowExtn.Length; i++)
            {
                if (exName == allowExtn[i])
                {
                    fileOk = true;
                    break;
                }
            }

            ////对上传文件的大小进行检测，限定文件最大不超过1M
            //if (FileUpload1.PostedFile.ContentLength > 1024000)
            //{
            //    fileOk = false;
            //}            if (!fileOk)
            {
                Response.Write("<script>alert('文件类型不对');</script>");
            }
            else
            {
                try
                {
                    FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                    Response.Write("<script>alert('上传成功');</script>");
                }
                catch
                {                    Response.Write("<script>alert('上传失败');</script>");
                }
            }        }
下载 <a href='文件路径'>下载 </a>       直接点击下载

Answer 2

//四种下载方未能
//你可以用以用个linkbutton放上去。。设置视图双击
//然后把代码放进去。
    protected void Button1_Click(object sender, EventArgs e)
        {
            //TransmitFile实现下载            /**/
            /*
             微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
             下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
             代码如下：
            */            Response.ContentType = "application/x-zip-compressed";
            Response.AddHeader("Content-Disposition", "attachment;filename=keji.rar");
            string filename = Server.MapPath("keji.rar");
            Response.TransmitFile(filename);
            Response.Write("<script language=\"javascript\" type=\"text/javascript\">");
            Response.Write("alert(\"下载成功\");");
            Response.Write("window.location.href=\"C_SC.aspx\";");
            Response.Write("</script>");
        }        protected void Button2_Click(object sender, EventArgs e)
        {            //WriteFile实现下载
            string fileName = "ceshi.rar";//客户端保存的文件名
            string filePath = Server.MapPath("keji.rar");//路径            FileInfo fileInfo = new FileInfo(filePath);
            Response.Clear();
            Response.ClearContent();
            Response.ClearHeaders();
            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
            Response.AddHeader("Content-Length", fileInfo.Length.ToString());
            Response.AddHeader("Content-Transfer-Encoding", "binary");
            Response.ContentType = "application/octet-stream";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            Response.WriteFile(fileInfo.FullName);
            Response.Flush();
            Response.End();
        }        protected void Button3_Click(object sender, EventArgs e)
        {
            //WriteFile分块下载            string fileName = "GhostXP.iso";//客户端保存的文件名
            string filePath = Server.MapPath("GhostXP7.7.iso");//路径            System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);            if (fileInfo.Exists == true)
            {
                const long ChunkSize = 409600;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
                byte[] buffer = new byte[ChunkSize];                Response.Clear();
                System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
                long dataLengthToRead = iStream.Length;//获取下载的文件总大小
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
                while (dataLengthToRead > 0 && Response.IsClientConnected)
                {
                    int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
                    Response.OutputStream.Write(buffer, 0, lengthRead);
                    Response.Flush();
                    dataLengthToRead = dataLengthToRead - lengthRead;
                }
                Response.Close();
            }
        }        //字符流方式下载文件
        protected void Button4_Click(object sender, EventArgs e)
        {
            string fileName = "ce2.rar";//客户端保存的文件名
            string filePath = Server.MapPath("keji.rar");//路径            //以字符流的形式下载文件
            FileStream fs = new FileStream(filePath, FileMode.Open);
            byte[] bytes = new byte[(int)fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();
            Response.ContentType = "application/octet-stream";
            //通知浏览器下载文件而不是打开
            Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
            Response.BinaryWrite(bytes);
            Response.Flush();
            Response.End();
        }

Answer 3

#region 文件下载
       public bool DownLoadFile(string localPath, string hostURL, int byteCount, string userID, long cruuent)
       {
           
           bool result = true;
           
           
           string tmpURL = hostURL;
          
           byteCount = byteCount * 1024;
           hostURL = tmpURL + "&npos=" + cruuent.ToString();
           
           System.IO.FileStream fs;  
           fs = new FileStream(localPath, FileMode.OpenOrCreate);
           if (cruuent > 0)
           {
               //偏移指针
               fs.Seek(cruuent, System.IO.SeekOrigin.Current); 
           }
           System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(hostURL);
           if (cruuent > 0)
           {
               request.AddRange(Convert.ToInt32(cruuent));    //设置Range值
           }           try
           {
               //向服务器请求，获得服务器回应数据流
               System.IO.Stream ns = request.GetResponse().GetResponseStream();               byte[] nbytes = new byte[byteCount];
               int nReadSize = 0;
               nReadSize = ns.Read(nbytes, 0, byteCount);
              
               while (nReadSize > 0)
               {
                   fs.Write(nbytes, 0, nReadSize);
                   nReadSize = ns.Read(nbytes, 0, byteCount);
                  
               }
               fs.Close();
               ns.Close();
           }
           catch(Exception ex)
           {
               LOG.Error("下载" + localPath + "的时候失败！" + "原因是:" + ex.Message);
               fs.Close();
               result = false;
           }
           return result;     
       }
       #endregion 上传
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string name = FileUpload1.FileName;//上传文件名字
        string size = FileUpload1.PostedFile.ContentLength.ToString();
        string type = FileUpload1.PostedFile.ContentType;
        string type2 = name.Substring(name.LastIndexOf(".") + 1);
        string ipath = Server.MapPath("upimg") + "\\" + name;
        string fpath = Server.MapPath("upfile") + "\\" + name;
        string path="F:\\aaa\\"+FileUpload1.FileName;
        string wpath = "upimg\\" + name;
        if (type2 == "jpg" || type2 == "gif" || type2 == "bmp" || type2 == "png")
        {
            FileUpload1.SaveAs("F:\\aaa\\"+FileUpload1.FileName);
           // Image1.ImageUrl="F:\\aaa\\"+FileUpload1.FileName;
            Label1.Text = "你传图片的名字是" + name + "<br>文件大小为" + size + "<br>文件类型为" + type2 + "<br>文件路径为" + ipath;
        }
        
        SqlConnection cn = new SqlConnection("server=.;database=Northwind;uid=sa;pwd=sa");
        SqlCommand cmd = new SqlCommand("insert into Image(imageName,imagepath) values('" + name + "','" + path + "')", cn);
        cn.Open();
        cmd.ExecuteNonQuery();
        cn.Close();
    }
    protected void Button2_Click(object sender, EventArgs e)
    {    SqlConnection cn = new SqlConnection("server=.;database=Northwind;uid=sa;pwd=sa");
    SqlCommand cmd = new SqlCommand("select imageName from Image where imageID='" + Convert.ToInt32(TextBox1.Text) + "'", cn);
    cn.Open();
    string a = cmd.ExecuteScalar().ToString();
    cn.Close();
    Image1.ImageUrl = "F:\\aaa\\" + a;
     }
}