using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; public partial class DFile : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void LinBtnDFile_Click(object sender, EventArgs e) { // 创建一比特数组 byte[] buffer = new Byte[10240]; // 指定要下载文件的路径. string filePath = @"D:爱智旮旯.rar"; // 或取文件名包括扩展名 string fileName = Path.GetFileName(filePath); Stream fileStream = null; try { // 打开文件 fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read); Response.Clear(); // 获取文件的大小 long fileSize = fileStream.Length; long sum = 0; if (Request.Headers["Range"] != null) { Response.StatusCode = 206; // 表示返回到客户端的 HTTP 输出状态的整数。默认值为 200。 sum = long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", "")); } if (sum != 0) { Response.AddHeader("Content-Range", "bytes " + sum.ToString() + "-" + ((long)(fileSize)).ToString() + "/" + fileSize.ToString()); } // 获取部分http头信息 Response.AddHeader("Content-Length", ((long)(fileSize - sum)).ToString()); Response.ContentType = "application/octet-stream"; //获取文件来源 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(fileName))); // Response.Flush(); fileStream.Position = sum; //设置当前流位置 fileSize = fileSize - sum; // 当文件大小大于0是进入循环 while (fileSize > 0) { // 判断客户端是否仍连接在服务器 if (Response.IsClientConnected) { // 获取缓冲区中的总字节数. int length = fileStream.Read(buffer, 0, 10240); // 写入数据 Response.OutputStream.Write(buffer, 0, length); // 将缓冲区的输出发送到客户端 Response.Flush(); buffer = new Byte[10240]; fileSize = fileSize - length; } else { //当用户断开后退出循环 fileSize = -1; } } } catch (Exception ex) { Response.Write("Error : " + ex.Message); } finally { if (fileStream != null) { //关闭文件 fileStream.Close(); } Response.End(); } } }