1 using System; 2 using System.Data; 3 using System.Configuration; 4 using System.Web; 5 using System.Web.Security; 6 using System.Web.UI; 7 using System.Web.UI.WebControls; 8 using System.Web.UI.WebControls.WebParts; 9 using System.Web.UI.HtmlControls; 10 using System.IO; 11 12 public partial class _Default : System.Web.UI.Page 13 { 14 protected void Page_Load(object sender, EventArgs e) 15 { 16 17 } 18 19 //TransmitFile实现下载 20 protected void Button1_Click(object sender, EventArgs e) 21 { 22 23 24 Response.ContentType = "application/x-zip-compressed"; 25 Response.AddHeader("Content-Disposition", "attachment;filename=z.zip"); 26 string filename = Server.MapPath("DownLoad/z.zip"); 27 Response.TransmitFile(filename); 28 } 29 30 //WriteFile实现下载 31 protected void Button2_Click(object sender, EventArgs e) 32 { 33 34 35 string fileName ="asd.txt";//客户端保存的文件名 36 string filePath=Server.MapPath("DownLoad/aaa.txt");//路径 37 38 FileInfo fileInfo = new FileInfo(filePath); 39 Response.Clear(); 40 Response.ClearContent(); 41 Response.ClearHeaders(); 42 Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName); 43 Response.AddHeader("Content-Length", fileInfo.Length.ToString()); 44 Response.AddHeader("Content-Transfer-Encoding", "binary"); 45 Response.ContentType = "application/octet-stream"; 46 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); 47 Response.WriteFile(fileInfo.FullName); 48 Response.Flush(); 49 Response.End(); 50 } 51 52 //WriteFile分块下载 53 protected void Button3_Click(object sender, EventArgs e) 54 { 55 56 string fileName = "aaa.txt";//客户端保存的文件名 57 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径 58 59 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath); 60 61 if (fileInfo.Exists == true) 62 { 63 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 64 byte[] buffer = new byte[ChunkSize]; 65 66 Response.Clear(); 67 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath); 68 long dataLengthToRead = iStream.Length;//获取下载的文件总大小 69 Response.ContentType = "application/octet-stream"; 70 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName)); 71 while (dataLengthToRead > 0 && Response.IsClientConnected) 72 { 73 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小 74 Response.OutputStream.Write(buffer, 0, lengthRead); 75 Response.Flush(); 76 dataLengthToRead = dataLengthToRead - lengthRead; 77 } 78 Response.Close(); 79 } 80 } 81 82 //流方式下载 83 protected void Button4_Click(object sender, EventArgs e) 84 { 85 string fileName = "aaa.txt";//客户端保存的文件名 86 string filePath = Server.MapPath("DownLoad/aaa.txt");//路径 87 88 //以字符流的形式下载文件 89 FileStream fs = new FileStream(filePath, FileMode.Open); 90 byte[] bytes = new byte[(int)fs.Length]; 91 fs.Read(bytes, 0, bytes.Length); 92 fs.Close(); 93 Response.ContentType = "application/octet-stream"; 94 //通知浏览器下载文件而不是打开 95 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)); 96 Response.BinaryWrite(bytes); 97 Response.Flush(); 98 Response.End(); 99 100 } 101 }
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