1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
//TransmitFile实现下载
protected
void
Button1_Click(
object
sender, EventArgs e)
{
/*
微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
代码如下:
*/
Response.ContentType =
"application/x-zip-compressed"
;
string
FileName =
"test.doc"
;
//使用UTF-8对文件名进行编码
Response.AppendHeader(
"Content-Disposition"
,
"attachment;filename=\""
+ HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) +
"\""
);
Response.ContentType =
"application/octet-stream"
;
Response.AddHeader(
"Content-Disposition"
,
"attachment;filename="
+ FileName);
string
filename = Server.MapPath(
"../ReportTemplate/test.doc"
);
Response.TransmitFile(filename);
}
//WriteFile实现下载
protected
void
Button2_Click(
object
sender, EventArgs e)
{
/*
using System.IO;
*/
string
fileName =
"test.doc"
;
//客户端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路径
FileInfo fileInfo =
new
FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader(
"Content-Disposition"
,
"attachment;filename=\""
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) +
"\""
);
Response.AddHeader(
"Content-Length"
, fileInfo.Length.ToString());
Response.AddHeader(
"Content-Transfer-Encoding"
,
"binary"
);
Response.ContentType =
"application/octet-stream"
;
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
}
//WriteFile分块下载
protected
void
Button3_Click(
object
sender, EventArgs e)
{
string
fileName =
"test.doc"
;
//客户端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路径
System.IO.FileInfo fileInfo =
new
System.IO.FileInfo(filePath);
if
(fileInfo.Exists ==
true
)
{
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
byte
[] buffer =
new
byte
[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
long
dataLengthToRead = iStream.Length;
//获取下载的文件总大小
Response.ContentType =
"application/octet-stream"
;
Response.AddHeader(
"Content-Disposition"
,
"attachment; filename="
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
while
(dataLengthToRead > 0 && Response.IsClientConnected)
{
int
lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
//读取的大小
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
}
//流方式下载
protected
void
Button4_Click(
object
sender, EventArgs e)
{
string
fileName =
"test.doc"
;
//客户端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路径
//以字符流的形式下载文件
FileStream fs =
new
FileStream(filePath, FileMode.Open);
byte
[] bytes =
new
byte
[(
int
)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
Response.ContentType =
"application/octet-stream"
;
//通知浏览器下载文件而不是打开
Response.AddHeader(
"Content-Disposition"
,
"attachment; filename="
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
}
|
注意:如果直接在aspx.cs上写以上的代码,response一定要手动关闭,否则就会把整个页面的HTML代码都给下载了。
还有一种方式就是把上面的代码放入一个一般处理程序中这样就可以很好的避免下载整个页面的HTML代码
代码如下
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
using
System.Web;
using
ECS.Biz.Common.Common;
using
ECS.Biz.DEPG1210Ds.ServiceModel;
namespace
ECS.Web.Handle
{
/// <summary>
/// DownLoad の概要の説明
/// </summary>
public
class
DownLoadHttpHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState
{
public
void
ProcessRequest(HttpContext context)
{
context.Response.ContentType =
"text/plain"
;
//因为用到了session传值,所以DownLoadHttpHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState
DEPG1210DsSvm l_svmDEPG1210Ds = (DEPG1210DsSvm)context.Session[ConstData.Session.DEPG1210_DEPG1210DsSvm];
string
l_strFileName = l_svmDEPG1210Ds.DEPG1210DsCtx.ConferenceInfoTbl.Entities[0].JournalsFileName;
byte
[] l_bytFileData = l_svmDEPG1210Ds.DEPG1210DsCtx.ConferenceInfoTbl.Entities[0].JournalsContent;
//HttpContext.Current.Response.Clear();
l_strFileName = System.Web.HttpUtility.UrlEncode(l_strFileName);
HttpContext.Current.Response.AppendHeader(
"Content-Disposition"
,
"attachment;filename="
+ l_strFileName);
if
(l_bytFileData.Length == 0)
{
l_bytFileData = System.Text.Encoding.Unicode.GetBytes(
" "
);
}
HttpContext.Current.Response.BinaryWrite(l_bytFileData);
//HttpContext.Current.Response.Flush();
//HttpContext.Current.Response.End();
}
public
bool
IsReusable
{
get
{
return
false
;
}
}
}
}
|
这个的传值我用的是Session来传值的所以画面调用的话就会很简单了
1
2
|
<asp:LinkButton ID=
"lbtnAttachFiles"
runat=
"server"
href=
"../Handle/DownLoadHttpHandler.ashx"
Width=
"160px"
CssClass=
"ShortNameShow"
></asp:LinkButton>
|
出处:http://www.cnblogs.com/WarBlog/p/5821948.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
//TransmitFile实现下载
protected
void
Button1_Click(
object
sender, EventArgs e)
{
/*
微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
代码如下:
*/
Response.ContentType =
"application/x-zip-compressed"
;
string
FileName =
"test.doc"
;
//使用UTF-8对文件名进行编码
Response.AppendHeader(
"Content-Disposition"
,
"attachment;filename=\""
+ HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) +
"\""
);
Response.ContentType =
"application/octet-stream"
;
Response.AddHeader(
"Content-Disposition"
,
"attachment;filename="
+ FileName);
string
filename = Server.MapPath(
"../ReportTemplate/test.doc"
);
Response.TransmitFile(filename);
}
//WriteFile实现下载
protected
void
Button2_Click(
object
sender, EventArgs e)
{
/*
using System.IO;
*/
string
fileName =
"test.doc"
;
//客户端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路径
FileInfo fileInfo =
new
FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader(
"Content-Disposition"
,
"attachment;filename=\""
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8) +
"\""
);
Response.AddHeader(
"Content-Length"
, fileInfo.Length.ToString());
Response.AddHeader(
"Content-Transfer-Encoding"
,
"binary"
);
Response.ContentType =
"application/octet-stream"
;
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
}
//WriteFile分块下载
protected
void
Button3_Click(
object
sender, EventArgs e)
{
string
fileName =
"test.doc"
;
//客户端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路径
System.IO.FileInfo fileInfo =
new
System.IO.FileInfo(filePath);
if
(fileInfo.Exists ==
true
)
{
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
byte
[] buffer =
new
byte
[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
long
dataLengthToRead = iStream.Length;
//获取下载的文件总大小
Response.ContentType =
"application/octet-stream"
;
Response.AddHeader(
"Content-Disposition"
,
"attachment; filename="
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
while
(dataLengthToRead > 0 && Response.IsClientConnected)
{
int
lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));
//读取的大小
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
}
//流方式下载
protected
void
Button4_Click(
object
sender, EventArgs e)
{
string
fileName =
"test.doc"
;
//客户端保存的文件名
string
filePath = Server.MapPath(
"../ReportTemplate/test.doc"
);
//路径
//以字符流的形式下载文件
FileStream fs =
new
FileStream(filePath, FileMode.Open);
byte
[] bytes =
new
byte
[(
int
)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
Response.ContentType =
"application/octet-stream"
;
//通知浏览器下载文件而不是打开
Response.AddHeader(
"Content-Disposition"
,
"attachment; filename="
+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
}
|
注意:如果直接在aspx.cs上写以上的代码,response一定要手动关闭,否则就会把整个页面的HTML代码都给下载了。
还有一种方式就是把上面的代码放入一个一般处理程序中这样就可以很好的避免下载整个页面的HTML代码
代码如下
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
using
System.Web;
using
ECS.Biz.Common.Common;
using
ECS.Biz.DEPG1210Ds.ServiceModel;
namespace
ECS.Web.Handle
{
/// <summary>
/// DownLoad の概要の説明
/// </summary>
public
class
DownLoadHttpHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState
{
public
void
ProcessRequest(HttpContext context)
{
context.Response.ContentType =
"text/plain"
;
//因为用到了session传值,所以DownLoadHttpHandler : IHttpHandler, System.Web.SessionState.IRequiresSessionState
DEPG1210DsSvm l_svmDEPG1210Ds = (DEPG1210DsSvm)context.Session[ConstData.Session.DEPG1210_DEPG1210DsSvm];
string
l_strFileName = l_svmDEPG1210Ds.DEPG1210DsCtx.ConferenceInfoTbl.Entities[0].JournalsFileName;
byte
[] l_bytFileData = l_svmDEPG1210Ds.DEPG1210DsCtx.ConferenceInfoTbl.Entities[0].JournalsContent;
//HttpContext.Current.Response.Clear();
l_strFileName = System.Web.HttpUtility.UrlEncode(l_strFileName);
HttpContext.Current.Response.AppendHeader(
"Content-Disposition"
,
"attachment;filename="
+ l_strFileName);
if
(l_bytFileData.Length == 0)
{
l_bytFileData = System.Text.Encoding.Unicode.GetBytes(
" "
);
}
HttpContext.Current.Response.BinaryWrite(l_bytFileData);
//HttpContext.Current.Response.Flush();
//HttpContext.Current.Response.End();
}
public
bool
IsReusable
{
get
{
return
false
;
}
}
}
}
|
这个的传值我用的是Session来传值的所以画面调用的话就会很简单了
1
2
|
<asp:LinkButton ID=
"lbtnAttachFiles"
runat=
"server"
href=
"../Handle/DownLoadHttpHandler.ashx"
Width=
"160px"
CssClass=
"ShortNameShow"
></asp:LinkButton>
|