Aspnet程序优化js、css实现合并与压缩方法

精品文档 A程序优化js、css实现合并与压缩方法本文实例讲述了A程序优化js、css实现合并与压缩的方法。分享给大家供大家参考。具体实现方法如下： 访问时将js和css压缩并且缓存在客户端, 采用的是Yahoo.Yui.Compressor组件来完成的,用户可以点击此处本站下载。 创建一个IHttpHandler来处理文件 代码如下:public class CombineFiles : IHttpHandler private const string CacheKeyFormat = “_CacheKey_0_”; private const bool IsCompress = true; /需要压缩 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.Cachecachekey as CompressCacheItem; if (cacheItem = null) string content = string.Empty; string path = context.Server.MapPath(“); /找到这个目录下所有的js或css文件，当然也可以进行配置，需求请求压缩哪些文件 /这里就将所的有文件都请求压缩 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(); / 开始压缩文件 if (IsCompress) if (type.Equals(“js”) content = JavaScriptCompressor.Compress(content); else if (type.Equals(“css”) content = CssCompressor.Compress(content); /输入到客户端还可以进行Gzip压缩 ,这里就省略了 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 以指定响应能由客户端和共享（代理）缓存进行缓存。 response.Cache.SetCacheability(HttpCacheability.Public); /是允许文档在被视为陈旧之前存在的最长绝对时间。 response.Cache.SetMaxAge(TimeSpan.FromTicks(expires.Ticks); response.Cache.SetSlidingExpiration(true); private class CompressCacheItem / <summary / 类型 js 或 css / </summary public string Type get; set; / js css / <summary / 内容 / </summary public string Content set; get; / <summary / 过期时间 / </summary public DateTime Expires set; get; 最后在配置文件中配置一下CombineFiles.axd文件，具体配置略 引用如下 复制代码 代码如下:<script type=“text/javascript” src=“/js/CombineFiles.axd?type=js”</s