private const bool IsCompress = true; //需要压缩
public void Compress(HttpContext context)
{
HttpRequest request = context.Request;
HttpResponse response = context.Response;
string cachekey = string.Empty;
string type = request.Url.Query.Substring(request.Url.Query.LastIndexOf(".")+1);
if (!string.IsNullOrEmpty(type) && (type == "css" || type == "js"))
{
if (type == "js")
{
response.ContentType = "text/javascript";
}
else if (type == "css")
{
response.ContentType = "text/css";
}
var paths = request.QueryString[0].Split(',');
cachekey = string.Format(CacheKeyFormat, paths[paths.Length-1].Split('-')[0]+"_"+type);
CompressCacheItem cacheItem = HttpRuntime.Cache[cachekey] as CompressCacheItem;
if (cacheItem == null)
{
string content = string.Empty;
//string[] files = Directory.GetFiles(path, "*." + type);
StringBuilder sb = new StringBuilder();
foreach (var item in paths)
{
string filename = context.Server.MapPath(item.Contains("."+type)?item:item+"."+type);
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 = new JavaScriptCompressor().Compress(content);
}
else if (type.Equals("css"))
{
content = new 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.AddMinutes(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);
}
}
}
