ASP.NET MVC3.0下载功能实现
C#代码: #region 下载文件 /// <summary> /// 下载文件 /// </summary> /// <param name="url">文件存放的物流路径</param> public void DownloadText(string url) { if (System.IO.File.Exists(url)) { string fileName = Path.GetFileName(url); FileStream fs = new FileStream(url, 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(); } else { Response.Write("<script>alert(‘没有找到下载的文件,可能已丢失‘);location.href=‘/ToolsAndPlug/ToolsAndPlugView‘;</script>"); } } #endregion Javascirpt提交方法: function DownloadToolsAndPlug(id) { var urlvalue = $("#" + id).val(); window.location.href = ‘/ToolsAndPlug/DownloadText?url=‘ + urlvalue; }
页面: var id = 1; foreach (var item in Model) { <div class="TP_databg"> @if (string.IsNullOrEmpty(item.PlugOrToolsImage)) { <img src="../../Image/common/NoPictrue.jpg" /> } else { <img src="@item.PlugOrToolsImage" /> } <div class="TP_datafont"> <div class="TP_datafontbg TP_datatitle"> @item.PlugOrToolsName</div> <div class="TP_datafontbg TP_datasummary"> @item.PlugOrToolsSummary</div> <div class="TP_datafontbg TP_databutton"> <span class="smallbutton" onclick="DownloadToolsAndPlug(‘psthid@(id)‘)">下载</span> <input type="hidden" id="psthid@(id)" value="@item.PlugOrToolsUrl"/></div> </div> </div> id = id + 1; } 说明:页面使用一个隐藏控件记录要下载文件的物理路径,通过脚本赋值传递给后台代码。
其他下载方法参考: //TransmitFile实现下载 protected void Button1_Click(object sender, EventArgs e) { /* 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=z.zip"); string filename = Server.MapPath("DownLoad/aaa.zip"); Response.TransmitFile(filename); } //WriteFile实现下载 protected void Button2_Click(object sender, EventArgs e) { /* using System.IO; */ string fileName ="aaa.zip";//客户端保存的文件名 string filePath=Server.MapPath("DownLoad/aaa.zip");//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(); } //WriteFile分块下载 protected void Button3_Click(object sender, EventArgs e) { string fileName = "aaa.zip";//客户端保存的文件名 string filePath = Server.MapPath("DownLoad/aaa.zip");//路径 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath); if (fileInfo.Exists == true) { const long ChunkSize = 102400;//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(); } } //流方式下载 protected void Button4_Click(object sender, EventArgs e) { string fileName = "aaa.zip";//客户端保存的文件名 string filePath = Server.MapPath("DownLoad/aaa.zip");//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(); }
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