.Net实现GZip压缩网页，C#设置开启GZip压缩

.Net实现GZip压缩网页，C#设置开启GZip压缩

以二进制输入缓冲器和GZIP编码输入

检查是否gzip是支持的客户端

using System;
using System.Web;
using System.IO;
using System.Text;
using System.IO.Compression;
using System.Text.RegularExpressions;
namespace yunjsonWeb
{
    public class GZipHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            HttpContext Context = HttpContext.Current;
            HttpRequest Request = Context.Request;
            HttpResponse Response = Context.Response;
            string AcceptEncoding = Request.Headers["Accept-Encoding"];
            // *** 首先检查是否gzip是支持的客户端
            bool UseGZip = false;
            if (!string.IsNullOrEmpty(AcceptEncoding) &&
                AcceptEncoding.ToLower().IndexOf("gzip") > -1)
                UseGZip = true;
            // *** 创建一个cachekey并检查是否存在
            string CacheKey = Request.QueryString.ToString() + UseGZip.ToString();
            byte[] Output = Context.Cache[CacheKey] as byte[];
            if (Output != null)
            {
                // *** 是的-读缓存和发送给客户端
                SendOutput(Output, UseGZip);
                return;
            }
            // ***加载脚本文件
            string Script = "";
            StreamReader sr = new StreamReader(context.Server.MapPath(Request["src"]));
            Script = sr.ReadToEnd();
            // *** 现在我们准备开始创建输出
            // *** 除非至少有8K不gzip
            if (UseGZip && Script.Length > 6000)
                Output = GZipMemory(Script);
            else
            {
                Output = Encoding.ASCII.GetBytes(Script);
                UseGZip = false;
            }
            // *** 添加到缓存中的一天
            Context.Cache.Add(CacheKey, Output, null, DateTime.UtcNow.AddDays(1), TimeSpan.Zero, System.Web.Caching.CacheItemPriority.High, null);
            // *** 写出合适的客户端缓存设置的响应对象
            this.SendOutput(Output, UseGZip);
        }
        /// <summary>
        /// 将输出发送到客户端使用适当的缓存设置。
        /// 内容应该已经准备好要发送的编码和二进制。
        /// </summary>
        /// <param name="Output"></param>
        /// <param name="UseGZip"></param>
        private void SendOutput(byte[] Output, bool UseGZip)
        {
            HttpResponse Response = HttpContext.Current.Response;
            Response.ContentType = "application/x-javascript";
            if (UseGZip)
                Response.AppendHeader("Content-Encoding", "gzip");
            //if (!HttpContext.Current.IsDebuggingEnabled)
            // {
            Response.ExpiresAbsolute = DateTime.UtcNow.AddYears(1);
            Response.Cache.SetLastModified(DateTime.UtcNow);
            Response.Cache.SetCacheability(HttpCacheability.Public);
            // }
            Response.BinaryWrite(Output);
            Response.End();
        }
        /// <summary>
        ///以二进制输入缓冲器和GZIP编码输入
        /// </summary>
        /// <param name="Buffer"></param>
        /// <returns></returns>
        public static byte[] GZipMemory(byte[] Buffer)
        {
            MemoryStream ms = new MemoryStream();
            GZipStream GZip = new GZipStream(ms, CompressionMode.Compress);
            GZip.Write(Buffer, 0, Buffer.Length);
            GZip.Close();
            byte[] Result = ms.ToArray();
            ms.Close();
            return Result;
        }
        public static byte[] GZipMemory(string Input)
        {
            return GZipMemory(Encoding.ASCII.GetBytes(Input));
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}