Asp.net程序优化js、css实现合并与压缩的方法(2)

// 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"></script>
<link type="text/css" href="/css/CombineFiles.axd?type=css" />