欧美bbbwbbbw肥妇,免费乱码人妻系列日韩,一级黄片

Asp.net程序優(yōu)化js、css實(shí)現(xiàn)合并與壓縮的方法

 更新時(shí)間:2014年12月17日 09:07:16   投稿:shichen2014  
這篇文章主要介紹了Asp.net程序優(yōu)化js、css實(shí)現(xiàn)合并與壓縮的方法,使用第三方組件實(shí)現(xiàn)訪(fǎng)問(wèn)時(shí)將js與css文件壓縮并緩存在客戶(hù)端的效果,非常具有實(shí)用價(jià)值,需要的朋友可以參考下

本文實(shí)例講述了Asp.net程序優(yōu)化js、css實(shí)現(xiàn)合并與壓縮的方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下:

訪(fǎng)問(wèn)時(shí)將js和css壓縮并且緩存在客戶(hù)端,
采用的是Yahoo.Yui.Compressor組件來(lái)完成的,用戶(hù)可以點(diǎn)擊此處本站下載。

創(chuàng)建一個(gè)IHttpHandler來(lái)處理文件

復(fù)制代碼 代碼如下:

public class CombineFiles : IHttpHandler
{
        private const string CacheKeyFormat = "_CacheKey_{0}_";

        private const bool IsCompress = true; //需要壓縮

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

        public void ProcessRequest(HttpContext context)
        {
            HttpRequest request = context.Request;
            HttpResponse response = context.Response;

            string cachekey = string.Empty;

            string type = request.QueryString["type"];
            if (!string.IsNullOrEmpty(type) && (type == "css" || type == "js"))
            {
                if (type == "js")
                {
                    response.ContentType = "text/javascript";

                }
                else if (type == "css")
                {
                    response.ContentType = "text/css";
                }

                cachekey = string.Format(CacheKeyFormat, type);

                CompressCacheItem cacheItem = HttpRuntime.Cache[cachekey] as CompressCacheItem;
                if (cacheItem == null)
                {
                    string content = string.Empty;
                    string path = context.Server.MapPath("");
                    //找到這個(gè)目錄下所有的js或css文件,當(dāng)然也可以進(jìn)行配置,需求請(qǐng)求壓縮哪些文件
                    //這里就將所的有文件都請(qǐng)求壓縮
                    string[] files = Directory.GetFiles(path, "*." + type);
                    StringBuilder sb = new StringBuilder();
                    foreach (string fileName in files)
                    {
                        if (File.Exists(fileName))
                        {
                            string readstr = File.ReadAllText(fileName, Encoding.UTF8);
                            sb.Append(readstr);
                        }
                    }

                    content = sb.ToString();

                    // 開(kāi)始?jí)嚎s文件
                    if (IsCompress)
                    {
                        if (type.Equals("js"))
                        {
                            content = JavaScriptCompressor.Compress(content);
                        }
                        else if (type.Equals("css"))
                        {
                            content = CssCompressor.Compress(content);
                        }
                    }

                    //輸入到客戶(hù)端還可以進(jìn)行Gzip壓縮 ,這里就省略了

                    cacheItem = new CompressCacheItem() { Type = type, Content = content, Expires = DateTime.Now.AddDays(30) };
                    HttpRuntime.Cache.Insert(cachekey, cacheItem, null, cacheItem.Expires, TimeSpan.Zero);
                }

                string ifModifiedSince = request.Headers["If-Modified-Since"];
                if (!string.IsNullOrEmpty(ifModifiedSince)
                    && TimeSpan.FromTicks(cacheItem.Expires.Ticks - DateTime.Parse(ifModifiedSince).Ticks).Seconds < 0)
                {
                    response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
                    response.StatusDescription = "Not Modified";
                }
                else
                {
                    response.Write(cacheItem.Content);
                    SetClientCaching(response, cacheItem.Expires);
                }
            }
        }

        private void SetClientCaching(HttpResponse response, DateTime expires)
        {
            response.Cache.SetETag(DateTime.Now.Ticks.ToString());
            response.Cache.SetLastModified(DateTime.Now);

            //public 以指定響應(yīng)能由客戶(hù)端和共享(代理)緩存進(jìn)行緩存。   
            response.Cache.SetCacheability(HttpCacheability.Public);

            //是允許文檔在被視為陳舊之前存在的最長(zhǎng)絕對(duì)時(shí)間。
            response.Cache.SetMaxAge(TimeSpan.FromTicks(expires.Ticks));

            response.Cache.SetSlidingExpiration(true);
        }
        private class CompressCacheItem
        {
            /// <summary>
            /// 類(lèi)型 js 或 css
            /// </summary>
            public string Type { get; set; } // js css 
            /// <summary>
            /// 內(nèi)容
            /// </summary>
            public string Content { set; get; }
            /// <summary>
            /// 過(guò)期時(shí)間
            /// </summary>
            public DateTime Expires { set; get; }
        }
}

最后在配置文件中配置一下CombineFiles.axd文件,具體配置略

引用如下

復(fù)制代碼 代碼如下:
<script type="text/javascript" src="/js/CombineFiles.axd?type=js"></script>
<link rel="stylesheet" type="text/css" href="/css/CombineFiles.axd?type=css" />

希望本文所述對(duì)大家的asp.net程序設(shè)計(jì)有所幫助。

相關(guān)文章

最新評(píng)論