C#.NET 网络操作类
using
System;
using
System.Web;
using
System.Text;
using
System.IO;
using
System.Net;
using
System.Runtime.InteropServices;
using
System.Web.UI;
namespace
Pub.Class
{
///
<summary>
///
网络操作类
///
</summary>
public
class
Net
{
private
static
object
lockHelper
=
new
object
();
#region
DownFile/ResponseFile/GetHttpFile
///
<summary>
///
下载文件
///
</summary>
///
<param name="fileFile">
文件路径（绝对路径）
</param>
///
<returns >
返回文件是否存在，存在下载成功
</returns>
public
static
bool
DownFile(
string
fileFile)
{
if
(System.IO.File.Exists(fileFile)) {
FileInfo _DownloadFile
=
new
FileInfo(fileFile);
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.Buffer
=
false
;
HttpContext.Current.Response.ContentType
=
"
application/octet-stream
"
;
HttpContext.Current.Response.AppendHeader(
"
Content-Disposition
"
,
"
attachment;filename=
"
+
HttpUtility.UrlEncode(_DownloadFile.FullName, System.Text.Encoding.UTF8));
HttpContext.Current.Response.AppendHeader(
"
Content-Length
"
, _DownloadFile.Length.ToString());
HttpContext.Current.Response.WriteFile(_DownloadFile.FullName);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
return
true
;
}
return
false
;
}
public
static
string
DownFile(
string
url,
string
fileName) {
WebClient wc
=
new
WebClient();
try
{
wc.DownloadFile(url,fileName);
}
catch
{
fileName
=
""
;
}
finally
{
wc.Dispose();
}
return
fileName;
}
///
<summary>
///
以指定的ContentType输出指定文件文件
///
</summary>
///
<param name="filepath">
文件路径
</param>
///
<param name="filename">
输出的文件名
</param>
///
<param name="filetype">
将文件输出时设置的ContentType
</param>
public
static
void
ResponseFile(
string
filepath,
string
filename,
string
filetype)
{
Stream iStream
=
null
;
//
缓冲区为10k
byte
[] buffer
=
new
Byte[
10000
];
//
文件长度
int
length;
//
需要读的数据长度
long
dataToRead;
try
{
//
打开文件
iStream
=
new
FileStream(filepath, FileMode.Open, FileAccess.Read,FileShare.Read);
//
需要读的数据长度
dataToRead
=
iStream.Length;
HttpContext.Current.Response.ContentType
=
filetype;
HttpContext.Current.Response.AddHeader(
"
Content-Disposition
"
,
"
attachment;filename=
"
+
filename.Trim().UrlEncode().Replace(
"
+
"
,
"
"
));
while
(dataToRead
>
0
) {
//
检查客户端是否还处于连接状态
if
(HttpContext.Current.Response.IsClientConnected) {
length
=
iStream.Read(buffer,
0
,
10000
);
HttpContext.Current.Response.OutputStream.Write(buffer,
0
, length);
HttpContext.Current.Response.Flush();
buffer
=
new
Byte[
10000
];
dataToRead
=
dataToRead
-
length;
}
else
{
//
如果不再连接则跳出死循环
dataToRead
=
-
1
;
}
}
}
catch
(Exception ex) {
HttpContext.Current.Response.Write(
"
Error :
"
+
ex.Message);
}
finally
{
if
(iStream
!=
null
) iStream.Close();
//
关闭文件
}
HttpContext.Current.Response.End();
}
///
<summary>
///
下载远程的文件
///
</summary>
///
<param name="sUrl">
URL
</param>
///
<param name="sSavePath">
保存到
</param>
///
<returns>
成功否
</returns>
///
<example>
///
<code>
///
TimeSpan oStartTime=DateTime.Now.TimeOfDay;
///
Response.Write(GetHttpFile("
http://www.spbdev.com/download/DotNetInfo1.0.rar
",Request.MapPath("RecievedFile.rar")));
///
Response.Write("<br><br>\r\n执行时间：" + DateTime.Now.TimeOfDay.Subtract(oStartTime).TotalMilliseconds.ToString() + " 毫秒");
///
</code>
///
</example>
public
bool
GetHttpFile(
string
sUrl,
string
sSavePath) {
string
sException
=
null
;
bool
bRslt
=
false
;
WebResponse oWebRps
=
null
;
WebRequest oWebRqst
=
WebRequest.Create(sUrl);
oWebRqst.Timeout
=
50000
;
try
{
oWebRps
=
oWebRqst.GetResponse();
}
catch
(WebException e){
sException
=
e.Message.ToString();
}
catch
(Exception e){
sException
=
e.ToString();
}
finally
{
if
(oWebRps
!=
null
){
BinaryReader oBnyRd
=
new
BinaryReader(oWebRps.GetResponseStream(),System.Text.Encoding.GetEncoding(
"
GB2312
"
));
int
iLen
=
Convert.ToInt32(oWebRps.ContentLength);
FileStream oFileStream;
try
{
if
(File.Exists( HttpContext.Current.Request.MapPath(
"
RecievedData.tmp
"
)))
oFileStream
=
File.OpenWrite(sSavePath);
else
oFileStream
=
File.Create(sSavePath);
oFileStream.SetLength((Int64)iLen);
oFileStream.Write(oBnyRd.ReadBytes(iLen),
0
,iLen);
oFileStream.Close();
}
finally
{
oBnyRd.Close();
oWebRps.Close();
}
bRslt
=
true
;
}
}
return
bRslt;
}
#endregion
#region
GetRemoteHtmlCode/GetRemoteHtmlCode2/GetRemoteHtmlCode3
///
<summary>
///
获取远程文件源代码 GetRemoteHtmlCode(@"
http://www.baidu.com
");
///
</summary>
///
<param name="Url">
远程url
</param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode2(
string
Url) {
return
GetRemoteHtmlCode2(Url, Encoding.Default);
}
///
<summary>
///
获取远程文件源代码
///
</summary>
///
<param name="Url"></param>
///
<param name="encoding"></param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode2(
string
Url, System.Text.Encoding encoding) {
lock
(lockHelper) {
Url
+=
(Url.IndexOf(
"
?
"
)
>=
0
?
"
&time=
"
:
"
?time=
"
)
+
Rand.RndDateStr();
string
s
=
""
; HttpWebResponse response
=
null
; StreamReader stream
=
null
;
try
{
HttpWebRequest request
=
(HttpWebRequest)WebRequest.Create(Url);
response
=
(HttpWebResponse) request.GetResponse();
stream
=
new
StreamReader(response.GetResponseStream(),encoding);
s
=
stream.ReadToEnd();
}
catch
{}
finally
{
if
(stream
!=
null
) stream.Close();
if
(response
!=
null
) response.Close();
}
return
s;
}
}
///
<summary>
///
获取远程文件源代码 GetRemoteHtmlCode(@"
http://www.baidu.com
");
///
</summary>
///
<param name="strUrl">
远程url
</param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode3(
string
strUrl) {
return
GetRemoteHtmlCode3(strUrl, Encoding.Default);
}
///
<summary>
///
获取远程文件源代码
///
</summary>
///
<param name="strUrl"></param>
///
<param name="encoding"></param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode3(
string
strUrl, System.Text.Encoding encoding)
{
lock
(lockHelper) {
strUrl
+=
(strUrl.IndexOf(
"
?
"
)
>=
0
?
"
&time=
"
:
"
?time=
"
)
+
Rand.RndDateStr();
StringBuilder Html
=
new
StringBuilder();
HttpWebResponse myRp
=
null
; StreamReader sr
=
null
; Stream mystr
=
null
;
try
{
HttpWebRequest myRq
=
(HttpWebRequest)HttpWebRequest.Create(strUrl);
myRq.AllowAutoRedirect
=
true
;
myRq.Timeout
=
1000
*
60
*
3
;
myRq.UserAgent
=
"
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
"
;
myRq.Referer
=
strUrl;
myRp
=
(HttpWebResponse)myRq.GetResponse();
mystr
=
myRp.GetResponseStream();
sr
=
new
StreamReader(mystr,encoding);
while
(sr.Peek()
!=-
1
) { Html.Append(sr.ReadToEnd()); }
}
catch
{
return
"
-1
"
;
}
finally
{
if
(sr
!=
null
) sr.Close();
if
(mystr
!=
null
) mystr.Close();
if
(myRp
!=
null
) myRp.Close();
}
return
Html.ToString();
}
}
///
<summary>
///
获取远程文件源代码 GetRemoteHtmlCode(@"
http://www.baidu.com
");
///
</summary>
///
<param name="strUrl">
远程url
</param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode4(
string
strUrl) {
return
GetRemoteHtmlCode4(strUrl, Encoding.Default);
}
///
<summary>
///
获取远程文件源代码
///
</summary>
///
<param name="Url"></param>
///
<param name="encoding"></param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode4(
string
Url, System.Text.Encoding encoding)
{
lock
(lockHelper) {
Url
+=
(Url.IndexOf(
"
?
"
)
>=
0
?
"
&time=
"
:
"
?time=
"
)
+
Rand.RndDateStr();
WebClient wc
=
new
WebClient();
wc.Credentials
=
CredentialCache.DefaultCredentials;
Byte[] pageData
=
wc.DownloadData(Url);
string
content
=
encoding.GetString(pageData);
wc.Dispose();
return
content;
}
}
///
<summary>
///
获取远程文件源代码 GetRemoteHtmlCode(@"
http://www.baidu.com
");
///
</summary>
///
<param name="strUrl">
远程url
</param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode5(
string
strUrl) {
return
GetRemoteHtmlCode5(strUrl, Encoding.Default);
}
///
<summary>
///
获取远程文件源代码
///
</summary>
///
<param name="Url"></param>
///
<param name="encoding"></param>
///
<returns></returns>
public
static
string
GetRemoteHtmlCode5(
string
Url, System.Text.Encoding encoding)
{
lock
(lockHelper) {
Url
+=
(Url.IndexOf(
"
?
"
)
>=
0
?
"
&time=
"
:
"
?time=
"
)
+
Rand.RndDateStr();
string
postString
=
""
;
WebClient webClient
=
new
WebClient();
webClient.Headers.Add(
"
Content-Type
"
,
"
application/x-www-form-urlencoded
"
);
byte
[] postData
=
Encoding.ASCII.GetBytes(postString);
byte
[] responseData
=
webClient.UploadData(Url,
"
POST
"
, postData);
string
srcString
=
encoding.GetString(responseData);
webClient.Dispose();
return
srcString;
}
}
#endregion
#region
TransHtml
///
<summary>
///
转换为静态html
///
</summary>
public
static
void
TransHtml(
string
path,
string
outpath,System.Text.Encoding encoding) {
lock
(lockHelper) {
FileStream stream
=
null
;
StringWriter writer
=
new
StringWriter();
try
{
Page page
=
new
Page();
page.Server.Execute(path, writer);
if
(File.Exists(outpath)) {
File.Delete(outpath);
stream
=
File.Create(outpath);
}
else
{
stream
=
File.Create(outpath);
}
byte
[] bytes
=
encoding.GetBytes(writer.ToString());
stream.Write(bytes,
0
, bytes.Length);
}
catch
{}
finally
{
if
(writer
!=
null
) { writer.Close(); writer.Dispose(); }
if
(stream
!=
null
) { stream.Close(); stream.Dispose(); }
}
}
}
#endregion
}
}