<!--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 ("页面没有指定id")); } string filename=Server.MapPath("statichtml_"+id+".html"); //尝试读取已有文件 Stream s = GetFileStream (filename); if (s != null)//如果文件存在并且读取成功 { using (s) { Stream2Stream (s, Response.OutputStream); Response.End (); } } //调用Main_Execute,并且获取其输出 StringWriter sw = new StringWriter (); Server.Execute ("Main_Execute.aspx", sw); string content = sw.ToString (); //输出到客户端 Response.Write(content); Response.Flush(); //写进文件 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小时后过期 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>
其中原理是这样的.
Main_Execute.aspx是生成HTML的页面.
现在用Main.aspx来对它进行缓存.
过程如下:
首先根据页面参数算出文件名.(这个例子只根据Request.QueryString["id"]来算)
尝试读取缓存的文件.如果成功,那么Response.End();
如果不成功:
使用Server.Execute来调用Main_Execute.aspx,并且获取它的结果内容.
得到内容后,立刻输出到客户端.
最后把内容写进文件里,提供给下一次做为缓存度取.
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