public void ProcessRequest(HttpContext Context)
{
#region Note
//<img src="${siteurl}Timthumb.ashx?src=${item.Images.Bigimg}&h=95&w=142&zc=1" width="142" height="95" alt="${item.title}" />
#endregion
Context.Response.Clear();
Context.Response.ClearHeaders();
Context.Response.ClearContent();
Context.Response.ContentType = "image/jpeg";
string static_cache = "/cache/cache_images/";
string static_random = "/common/images/random/tb";
//宽度
int w = VTSRequest.GetQueryInt("w");
//高度
int h = VTSRequest.GetQueryInt("h");
//预留
int zc = VTSRequest.GetQueryInt("zc");
//图片地址
string src = VTSRequest.GetQueryString("src");
//原始 URL --一张图片一个唯一的URL地址
string url = VTSRequest.GetRawUrl();
//图片名字
string md5 = MD5Encrypt.DataToMD5(url);
//////////////开始分文件夹/////////////////
string folderName = md5.Substring(0, 2);
string imageDir = Context.Server.MapPath(static_cache + folderName);
if (!Directory.Exists(imageDir))
{
Directory.CreateDirectory(imageDir);
}
//////////////结束分文件夹/////////////////
//物理地址
string imageSavePath = string.Concat(imageDir, "\\", md5, ".jpg"); //Context.Server.MapPath("/cache/cache_images/" + md5 + ".jpg");
//VTS.Log.LogOut.Info(string.Format("ManagedThreadId:{0} src:{1},url:{2}", System.Threading.Thread.CurrentThread.ManagedThreadId, src, url));
/*******************************************************************************************************************************************************/
byte[] b = null;
if (File.Exists(imageSavePath))
{
#region 图片已存在
#region 缓存策略
//正确显示图片 才设置图片缓存策略
//配置成一个星期 168小时
Context.Response.Cache.SetExpires(DateTime.Now.AddHours(168));
//下面的代码示例演示如何设置 Cache-Control: max-age 标题，为 0 小时，30 分钟和 0 秒。
TimeSpan ts = new TimeSpan(168, 0, 0);
Context.Response.Cache.SetMaxAge(ts);
#endregion
b = VTSCommon.GetPictureData(imageSavePath);
Context.Response.OutputStream.Write(b, 0, b.Length);
#endregion
}
else
{
#region 图片不存在
#region 线程池生成
ImagePackage image = new ImagePackage();
image.Src = src;
image.SavePath = imageSavePath;
image.Width = w;
image.Height = h;
//线程池生成
WaitCallback callBack = new WaitCallback(GeneratePicture);
ThreadPool.QueueUserWorkItem(callBack, image);
//直接生成
//GeneratePicture(image);
#endregion
#region 响应 随机
imageSavePath = Context.Server.MapPath(string.Concat(static_random, ImageRandom.GetRandomInt().ToString(), ".jpg"));
b = VTSCommon.GetPictureData(imageSavePath);
#endregion
//清除缓存头策略
Context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
Context.Response.Cache.SetNoStore();
Context.Response.OutputStream.Write(b, 0, b.Length);
#endregion
}
Context.ApplicationInstance.CompleteRequest();
}