62,025
社区成员
发帖
与我相关
我的任务
分享
#region Web下载文件
/// <summary>
/// Web下载文件
/// </summary>
/// <param name="physicalPath">要下载文件的物理路径</param>
/// <param name="contentType">文件类型,如 excel是 application/vnd.ms-excel word 是application/msword</param>
public static void DownloadFile(string physicalPath, string contentType)
{
HttpContext.Current.Response.Clear();
// Buffer to read 10K bytes in chunk:
byte[] buffer = new Byte[10000];
// Length of the file:
int length;
// Total bytes to read:
long dataToRead;
string filename = Path.GetFileName(physicalPath);
using (Stream iStream = new FileStream(physicalPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
// Total bytes to read:
dataToRead = iStream.Length;
HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;
HttpContext.Current.Response.ContentType = contentType;
HttpContext.Current.Response.AddHeader("Content-Length", iStream.Length.ToString());
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, Encoding.UTF8));
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (HttpContext.Current.Response.IsClientConnected)
{
// Read the data in buffer.
length = iStream.Read(buffer, 0, 10000);
// Write the data to the current output stream.
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
// Flush the data to the HTML output.
//HttpContext.Current.Response.Flush();// 测试服务器无法在发送 HTTP 标头之后追加标头
buffer = new Byte[10000];
dataToRead = dataToRead - length;
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
}
#endregion
using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
namespace Asiastar.NR.Ajax
{
/// <summary>
/// $codebehindclassname$ 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Handler1 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string id = context.Request["id"].ToString();//获取资源的编号
System.IO.Stream iStream = null;
byte[] buffer = new Byte[10000];
int length;
long dataToRead;
NRBLL.File bf = new Asiastar.NRBLL.File();
Guid guid = new Guid(id);
if( bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"] != null )//判断数据库路径是否存在
{
string filepath = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString();//获取资源完整路径 D:\资源文件\600cc139-14cf-448e-9e50-daa972d35e01.jpg
string Oidfilename = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FileNam"].ToString();//旧文件名称
//string filename = System.IO.Path.GetFileName(filepath);//获取文件名称+后缀名 600cc139-14cf-448e-9e50-daa972d35e01.JPG
//int index = filepath.IndexOf(".");
//string filetype = filepath.Substring(index).ToLower();//后缀名
//string newfilename = Oidfilename;
//string filepath1 = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString().Substring(0,filepath.Length - 8);
try
{
string fileName = HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(Oidfilename));//解码(注意这里2层解码)
Oidfilename = Oidfilename.Replace("+","%20"); //将“+”替换成“空格”
iStream = new System.IO.FileStream(filepath,System.IO.FileMode.Open,System.IO.FileAccess.Read,System.IO.FileShare.Read);
dataToRead = iStream.Length;
context.Response.ContentType = "application/octet-stream";
context.Response.AddHeader("Content-Disposition","attachment; filename=" + HttpUtility.UrlEncode(Oidfilename,System.Text.Encoding.UTF8)); //下载的时候下载原来的文件名称
while( dataToRead > 0 )
{
if( context.Response.IsClientConnected )
{
length = iStream.Read(buffer,0,10000);
context.Response.OutputStream.Write(buffer,0,length);
context.Response.Flush();
buffer = new Byte[10000];
dataToRead = dataToRead - length;
}
else
{
dataToRead = -1;
}
}
}
catch( Exception ex )
{
NR.Error.Log.LogType(ex.ToString());
}
finally
{
if( iStream != null )
{
iStream.Close();
}
}
}
else
{
NR.Error.Log.LogType("找不到文件!");
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}