ASP.NET Tutorial/File Directory/GZipStream
Содержание
Compressing a file using GZipStream (C#)
<source lang="csharp">
<%@ Page Language="C#" %> <%@ Import Namespace="System.IO" %> <%@ Import Namespace="System.IO.rupression" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">
protected void Page_Load(object sender, EventArgs e) { string filename = Server.MapPath("Data.txt"); FileStream infile = File.OpenRead(filename); byte[] buffer = new byte[infile.Length]; infile.Read(buffer, 0, buffer.Length); infile.Close(); FileStream outfile = File.Create(Path.ChangeExtension(filename, "zip")); GZipStream gzipStream = new GZipStream(outfile, CompressionMode.rupress); gzipStream.Write(buffer, 0, buffer.Length); gzipStream.Close(); }
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
</form>
</body> </html></source>
Compressing a file using GZipStream (VB)
<source lang="csharp">
<%@ Page Language="VB" %> <%@ Import Namespace="System.IO" %> <%@ Import Namespace="System.IO.rupression" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Dim filename As String = Server.MapPath("TextFile.txt") Dim infile As FileStream = File.OpenRead(filename) Dim buffer(infile.Length) As Byte infile.Read(buffer, 0, buffer.Length) infile.Close() Dim outfile As System.IO.FileStream = File.Create(Path.ChangeExtension(filename, "zip")) Dim gzipStream As New GZipStream(outfile, CompressionMode.rupress) gzipStream.Write(buffer, 0, buffer.Length) gzipStream.Close() End Sub
</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">
<title>Untitled Page</title>
</head> <body>
<form id="form1" runat="server">
</form>
</body> </html></source>
Compressing HTTP output with an HttpModule (C#)
<source lang="csharp">
using System; using System.Collections.Generic; using System.Text; using System.Web; using System.IO; using System.IO.rupression; namespace ClassLibrary1 {
public class Class1 : IHttpModule { void IHttpModule.Dispose() { throw new Exception("The method or operation is not implemented."); } void IHttpModule.Init(HttpApplication context) { context.BeginRequest += new EventHandler(context_BeginRequest); } void context_BeginRequest(object sender, EventArgs e) { HttpApplication app = (HttpApplication)sender; string encodings = app.Request.Headers.Get("Accept-Encoding"); if (encodings == null) return; Stream s = app.Response.Filter; encodings = encodings.ToLower(); if (encodings.Contains("gzip")) { app.Response.Filter = new GZipStream(s, CompressionMode.rupress); app.Response.AppendHeader("Content-Encoding", "gzip"); app.Context.Trace.Warn("GZIP Compression on"); } else { app.Response.Filter = new DeflateStream(s, CompressionMode.rupress); app.Response.AppendHeader("Content-Encoding", "deflate"); app.Context.Trace.Warn("Deflate Compression on"); } } }
}</source>
Compressing HTTP output with an HttpModule (VB)
<source lang="csharp">
Imports System Imports System.Collections.Generic Imports System.Text Imports System.Web Imports System.IO Imports System.IO.rupression Public Class Class1
Implements IHttpModule Public Sub Dispose() Implements System.Web.IHttpModule.Dispose Throw New Exception("The method or operation is not implemented.") End Sub Public Sub Init(ByVal context As System.Web.HttpApplication) _ Implements System.Web.IHttpModule.Init AddHandler context.BeginRequest, AddressOf context_BeginRequest End Sub Public Sub context_BeginRequest(ByVal sender As Object, ByVal e As EventArgs) Dim app As HttpApplication = CType(sender, HttpApplication) Dim encodings As String = app.Request.Headers.Get("Accept-Encoding") If (encodings = Nothing) Then Return End If Dim s As Stream = app.Response.Filter encodings = encodings.ToLower() If (encodings.Contains("gzip")) Then app.Response.Filter = New GZipStream(s, CompressionMode.rupress) app.Response.AppendHeader("Content-Encoding", "gzip") app.Context.Trace.Warn("GZIP Compression on") Else app.Response.Filter = _ New DeflateStream(s, CompressionMode.rupress) app.Response.AppendHeader("Content-Encoding", "deflate") app.Context.Trace.Warn("Deflate Compression on") End If End Sub
End Class</source>