上传大文件的asp.net代码

2010-1-31 07:47| 发布者: admin| 查看: 24| 评论: 0|原作者: 回梦游仙

handler 类为：
namespace CoolUpload
{
public class module : IHttpModule
{
private string path = @"d:\iis\";
public void Dispose()
{
}
public void Init(HttpApplication application)
{
application.BeginRequest += (new EventHandler(this.BeginRequest));
}
public void BeginRequest(Object sender, EventArgs e)
{
HttpApplication context = sender as HttpApplication;
if (context.Request.ContentType.ToLower().StartsWith("multipart/form-data"))
{
IServiceProvider provider = (IServiceProvider)HttpContext.Current;
HttpWorkerRequest wr = (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
if (!wr.HasEntityBody()) return;
int theOtherLength = 0;
int contentLength;
string contentType;
contentLength = Convert.ToInt32(wr.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentLength));
contentType = wr.GetKnownRequestHeader(HttpWorkerRequest.HeaderContentType);
FileStream fs = null;
... ... 写文件 ....

//处理第一次读取的内容
byte[] b1 = wr.GetPreloadedEntityBody();
fs.Write(b1, 0, b1.Length);
theOtherLength = contentLength - b1.Length;
b1 = null;
int n = 65536;
int i = 0;

//读取剩余的数据，接着写文件
while (theOtherLength > 0)
{
byte[] b = new byte[n];
int readbytes;
if (theOtherLength <= n)
{
readbytes = wr.ReadEntityBody(b, theOtherLength);
}
else
{
readbytes = wr.ReadEntityBody(b, n);
}
fs.Write(b, 0, readbytes);
b = null;
theOtherLength -= readbytes;
i++;
}
fs.Close();
fs = null;
}
}
}
}
----------------------
断点续传
Stream fileStream = null;
try
{
fileStream = new FileStream(file.FullName, FileMode.Open, FileAccess.Read, FileShare.Read); //以流的方式打开文件
file_size = fileStream.Length;
fileStream.Position = pos ; //设置断点续传的起点

DateTime lastTime = DateTime.Now ;
while(file_size > 0)
{
if(Response.IsClientConnected)
{
i++;
real_length = fileStream.Read(buffer, 0, 2048); //将数据读入缓冲区
Response.OutputStream.Write(buffer, 0, real_length); //将缓冲区中的数据输出
Response.Flush(); //立即输出
file_size -= real_length;
buffer = new Byte[2048];
}
else
{
file_size = -1;
}
}
}
catch(Exception ex)
{
Response.Write("下载文件时发生错误：" + ex.Message);
}
finally
{
if(fileStream != null)
fileStream.Close();
}

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上传大文件的asp.net代码

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