private 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
/// <summary>
/// 下载文件
/// </summary>
/// <param name="context"></param>
public void ProcessRequest(HttpContext context)
{
SMT.Foundation.Log.Tracer.Debug("开始下载文件");
try
{
//\SMT\OA\考勤管理\2010121702324784503941.JPG
//string fileName = "123.jpg";//客户端保存的文件名
if (context.Request.QueryString["filename"] == null)
{
return;
}
String fileurl = HttpUtility.UrlDecode(context.Request.QueryString["filename"]);
SMT.Foundation.Log.Tracer.Debug("下载文件地址：" + fileurl);
// string filePath = string.Format(SavePath, fileName.Split('|')[0], fileName.Split('|')[1], fileName.Split('|')[2]+"\\"+fileName.Split('|')[3]); //context.Server.MapPath("Bubble.jpg");
string filePath = string.Format(FileConfig.GetCompanyItem(fileurl.Split('\\')[1]).SavePath, fileurl.Split('\\')[1], fileurl.Split('\\')[2], fileurl.Split('\\')[3] + "\\" + fileurl.Split('\\')[4]);
string NewfilePath = string.Format(FileConfig.GetCompanyItem(fileurl.Split('\\')[1]).SavePath, fileurl.Split('\\')[1], fileurl.Split('\\')[2], fileurl.Split('\\')[3] + "\\" + fileurl.Split('\\')[5]);
string saveFileName = fileurl.Split('\\')[5]; //保存文件名
string StrServicesFileName = fileurl.Split('\\')[4].Substring(0, 8); //取前面的作为解密字符串
System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
if (fileInfo.Exists == true)
{
//byte[] buffer = new byte[ChunkSize];
//context.Response.Clear();
//string Key = this.key;
string Key = StrServicesFileName;
//DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//des.Key = ASCIIEncoding.Default.GetBytes(Key);
//des.IV = ASCIIEncoding.Default.GetBytes(Key);
////Create a file stream to read the encrypted file back.
//FileStream fsread = new FileStream(filePath, FileMode.Open,FileAccess.Read);
////Create a DES decryptor from the DES instance.
//ICryptoTransform desdecrypt = des.CreateDecryptor();
//byte[] FileStreamArray = new byte[fsread.Length];
//fsread.Read(FileStreamArray, 0, FileStreamArray.Length);
//MemoryStream ms = new MemoryStream();
//CryptoStream FileCryptoStream = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read);
//FileCryptoStream.Write(FileStreamArray, 0, FileStreamArray.Length);
//FileCryptoStream.FlushFinalBlock();
//FileStream filOutStream = new FileStream(NewfilePath, FileMode.OpenOrCreate, FileAccess.Write);
////InputFileStream = File.OpenWrite(FileName);
//foreach (byte b in ms.ToArray())
//{
// filOutStream.WriteByte(b);
//}
//fsread.Close();
//ms.Close();
//filOutStream.Close();
//filOutStream.Dispose();
CryptoHelp.DecryptFile(filePath, NewfilePath, StrServicesFileName);
//System.IO.FileStream iStream = System.IO.File.OpenRead(NewfilePath);
long dataToRead;
int length;
byte[] buffer = new Byte[300000];
System.IO.FileStream iStream = new System.IO.FileStream(NewfilePath, System.IO.FileMode.Open,
System.IO.FileAccess.Read, System.IO.FileShare.Read);
// Total bytes to read:
dataToRead = iStream.Length;
context.Response.ContentType = "application/octet-stream";
context.Response.Charset = "UTF-8";
context.Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(saveFileName, System.Text.Encoding.UTF8));
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (context.Response.IsClientConnected)
{
// Read the data in buffer.
length = iStream.Read(buffer, 0, 300000);
// Write the data to the current output stream.
context.Response.OutputStream.Write(buffer, 0, length);
// Flush the data to the HTML output.
context.Response.Flush();
buffer = new Byte[300000];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
if (iStream != null)
{
//Close the file.
iStream.Close();
}
context.Response.Clear();
context.Response.End();
//long dataLengthToRead = iStream.Length;//获得下载文件的总大小
//context.Response.ContentType = "application/octet-stream";
////通知浏览器下载文件而不是打开
//context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(saveFileName, System.Text.Encoding.UTF8));
//while (dataLengthToRead > 0 && context.Response.IsClientConnected)
//{
// int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
// context.Response.OutputStream.Write(buffer, 0, lengthRead);
// //context.Response.Flush();
// dataLengthToRead = dataLengthToRead - lengthRead;
//}
//context.Response.Flush();
//iStream.Dispose();
//iStream.Close();
////context.Response.Close();
//context.Response.Clear();
////File.Delete(NewfilePath);
//context.Response.End();
}
else
{
System.Web.HttpContext.Current.Response.Write("<script>alert('该文件不存在！');</script>");
}
//context.Response.ContentType = "text/plain";
//context.Response.Write("Hello World");
}
catch (Exception ex)
{
SMT.Foundation.Log.Tracer.Debug("下载文件出错" + ex.ToString());
}
}
protected void Page_Load(object sender, EventArgs e)
{
SMT.Foundation.Log.Tracer.Debug("开始下载文件");
try
{
//\SMT\OA\考勤管理\2010121702324784503941.JPG
//string fileName = "123.jpg";//客户端保存的文件名
bool IsThum = false;//是否下载缩略图、不经过解密处理开关
if (Request["filename"] == null)
{
return;
}
if (Request["flag"] != null)
{
IsThum = true;
}
String fileurl = HttpUtility.UrlDecode(Request["filename"]);
SMT.Foundation.Log.Tracer.Debug("下载文件地址：" + fileurl);
string[] arrFilePath = fileurl.Split('\\');
// string filePath = string.Format(SavePath, fileName.Split('|')[0], fileName.Split('|')[1], fileName.Split('|')[2]+"\\"+fileName.Split('|')[3]); //context.Server.MapPath("Bubble.jpg");
string filePath = "";
if (arrFilePath.Length == 6)
{
filePath = string.Format(FileConfig.GetCompanyItem(arrFilePath[1]).SavePath, arrFilePath[1], arrFilePath[2], arrFilePath[3] + "\\" + arrFilePath[4]);
}
else
{
filePath = string.Format(FileConfig.GetCompanyItem(arrFilePath[1]).SavePath, arrFilePath[1], arrFilePath[2], arrFilePath[3] + "\\" + arrFilePath[4]) + "\\" + arrFilePath[arrFilePath.Length - 2];
}
string NewfilePath = "";
if (!IsThum)
{
NewfilePath = string.Format(FileConfig.GetCompanyItem(arrFilePath[1]).SavePath, arrFilePath[1], arrFilePath[2], arrFilePath[3] + "\\" + arrFilePath[5]);
}
else
{
//缩略图没有进行加密操作所以还是显示原图
NewfilePath = string.Format(FileConfig.GetCompanyItem(arrFilePath[1]).SavePath, arrFilePath[1], arrFilePath[2], arrFilePath[3] + "\\" + arrFilePath[4]) + "\\" + arrFilePath[arrFilePath.Length - 2];
}
SMT.Foundation.Log.Tracer.Debug("下载真实文件地址NewfilePath：" + NewfilePath);
string saveFileName = arrFilePath[arrFilePath.Length - 1]; //获取文件名
string StrServicesFileName = arrFilePath[arrFilePath.Length - 2].Substring(0, 8); //取前面的作为解密字符串
System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
if (fileInfo.Exists == true)
{
string Key = StrServicesFileName;
if (!IsThum)
{
CryptoHelp.DecryptFile(filePath, NewfilePath, StrServicesFileName);
}
Response.Charset = "utf-8";
Response.ContentEncoding = System.Text.Encoding.UTF8;
//ctx.Response.ContentEncoding
Response.AppendHeader("Content-Type", "text/html;charset=utf-8");
Response.AppendHeader("Content-Disposition", string.Format("attachment; filename={0}", HttpUtility.UrlEncode(saveFileName, System.Text.Encoding.UTF8)));
using (FileStream fs = new FileStream(NewfilePath, FileMode.Open, FileAccess.Read))
{
SMT.Foundation.Log.Tracer.Debug("下载文件路径NewfilePath：" + NewfilePath);
SMT.Foundation.Log.Tracer.Debug("下载文件大小：" + fs.Length);
byte[] fileData = new byte[fs.Length];
int numBytesToRead = (int)fs.Length;
int numBytesRead = 0;
while (numBytesToRead > 0)
{
// Read may return anything from 0 to numBytesToRead.
int n = fs.Read(fileData, numBytesRead, numBytesToRead);
// Break when the end of the file is reached.
if (n == 0)
{
break;
}
numBytesRead += n;
numBytesToRead -= n;
}
fs.Close();
SMT.Foundation.Log.Tracer.Debug("下载文件地址fileData：" + fileData.Length);
Response.BinaryWrite(fileData);
}
////System.IO.FileStream iStream = System.IO.File.OpenRead(NewfilePath);
//long dataToRead;
//int length;
//byte[] buffer = new Byte[300000];
//System.IO.FileStream iStream = new System.IO.FileStream(NewfilePath, System.IO.FileMode.Open,
//System.IO.FileAccess.Read, System.IO.FileShare.Read);
//// Total bytes to read:
//dataToRead = iStream.Length;
//Response.ContentType = "application/octet-stream";
//Response.Charset = "UTF-8";
//Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(saveFileName, System.Text.Encoding.UTF8));
//Response.AddHeader("Content-Length", dataToRead.ToString());
//// Read the bytes.
//while (dataToRead > 0)
//{
// // Verify that the client is connected.
// if (Response.IsClientConnected)
// {
// // Read the data in buffer.
// length = iStream.Read(buffer, 0, 300000);
// // Write the data to the current output stream.
// Response.OutputStream.Write(buffer, 0, length);
// // Flush the data to the HTML output.
// Response.Flush();
// buffer = new Byte[300000];
// dataToRead = dataToRead - length;
// }
// else
// {
// //prevent infinite loop if user disconnects
// dataToRead = -1;
// }
//}
//if (iStream != null)
//{
// //Close the file.
// iStream.Close();
// iStream.Dispose();
//}
//删除文件
if (!IsThum)
{
File.Delete(NewfilePath);
}
}
else
{
System.Web.HttpContext.Current.Response.Write("<script>alert('该文件不存在！');</script>");
}
//context.Response.ContentType = "text/plain";
//context.Response.Write("Hello World");
}
catch (Exception ex)
{
// Trap the error, if any.
Response.Write("下载出现异常Error : " + ex.Message);
Response.Clear();
Response.End();
}
finally
{
Response.End();
}
}
