<!--main.aspx-->
<%@ page language="c#" %>
<%@ import namespace=system.io %>
<script runat="server">
protected override void oninit (eventargs e)
{
int id;
try
{
id = int.parse (request.querystring["id"]);
}
catch
{
throw (new exception ("頁面沒有指定id"));
}
string filename=server.mappath("statichtml_"+id+".html");
//嘗試讀取已有文件
stream s = getfilestream (filename);
if (s != null)//如果文件存在并且讀取成功
{
using (s)
{
stream2stream (s, response.outputstream);
response.end ();
}
}
//調用main_execute,并且獲取其輸出
stringwriter sw = new stringwriter ();
server.execute ("main_execute.aspx", sw);
string content = sw.tostring ();
//輸出到客戶端
response.write(content);
response.flush();
//寫進文件
try
{
using (filestream fs = new filestream (filename, filemode.create, fileaccess.write, fileshare.write))
{
using (streamwriter streamwriter = new streamwriter (fs, response.contentencoding))
{
streamwriter.write (content);
}
}
}
finally
{
//response.end ();
}
}
static public void stream2stream (stream src, stream dst)
{
byte[] buf = new byte[4096];
while (true)
{
int c = src.read (buf, 0, buf.length);
if(c==0)
return;
dst.write (buf, 0, c);
}
}
public stream getfilestream(string filename)
{
try
{
datetime dt = file.getlastwritetime (filename);
timespan ts=dt - datetime.now;
if(ts.totalhours>1)
return null; //1小時后過期
return new filestream (filename, filemode.open, fileaccess.read, fileshare.read);
}
catch
{
return null;
}
}
</script>
<!--main_execute.aspx-->
<%@ page language="c#" %>
<html>
<head runat="server">
<title>untitled page</title>
</head>
<body>
id:
<%=request.querystring["id"]%>
</body>
</html>
<!--main.aspx-->
<%@ page language="c#" %>
<%@ import namespace=system.io %>
<script runat="server">
protected override void oninit (eventargs e)
{
int id;
try
{
id = int.parse (request.querystring["id"]);
}
catch
{
throw (new exception ("頁面沒有指定id"));
}
string filename=server.mappath("statichtml_"+id+".html");
//嘗試讀取已有文件
stream s = getfilestream (filename);
if (s != null)//如果文件存在并且讀取成功
{
using (s)
{
stream2stream (s, response.outputstream);
response.end ();
}
}
//調用main_execute,并且獲取其輸出
stringwriter sw = new stringwriter ();
server.execute ("main_execute.aspx", sw);
string content = sw.tostring ();
//輸出到客戶端
response.write(content);
response.flush();
//寫進文件
try
{
using (filestream fs = new filestream (filename, filemode.create, fileaccess.write, fileshare.write))
{
using (streamwriter streamwriter = new streamwriter (fs, response.contentencoding))
{
streamwriter.write (content);
}
}
}
finally
{
//response.end ();
}
}
static public void stream2stream (stream src, stream dst)
{
byte[] buf = new byte[4096];
while (true)
{
int c = src.read (buf, 0, buf.length);
if(c==0)
return;
dst.write (buf, 0, c);
}
}
public stream getfilestream(string filename)
{
try
{
datetime dt = file.getlastwritetime (filename);
timespan ts=dt - datetime.now;
if(ts.totalhours>1)
return null; //1小時后過期
return new filestream (filename, filemode.open, fileaccess.read, fileshare.read);
}
catch
{
return null;
}
}
</script>
<!--main_execute.aspx-->
<%@ page language="c#" %>
<html>
<head runat="server">
<title>untitled page</title>
</head>
<body>
id:
<%=request.querystring["id"]%>
</body>
</html>
其中原理是這樣的。
main_execute.aspx是生成html的頁面。
現在用main.aspx來對它進行緩存.
過程如下:
首先根據頁面參數算出文件名。(這個例子只根據request.querystring["id"]來算)
嘗試讀取緩存的文件.如果成功,那么response.end();
如果不成功:
使用server.execute來調用main_execute.aspx,并且獲取它的結果內容。
得到內容后,立刻輸出到客戶端。
最后把內容寫進文件里,提供給下一次做為緩存度取。
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