[转载]asp.net mvc3的静态化实现 - TerryLiang - 博客园

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[转载]asp.net mvc3的静态化实现 – TerryLiang – 博客园.

静态化处理,可以大大提高客户的访问浏览速度,提高用户体验,同时也降低了服务器本身的压力。在ASP.NET mvc3中,可以相对容易地处理静态化问题,不用过多考虑静态网页的同步,生成等等问题。我提供这个方法很简单,就需要在需要静态化处理的 Controller或Action上加一个Attribute就可以。下面是我写的一个生成静态文件的ActionFilterAttribute。

using System;
using System.IO;
     using System.Text;
     using System.Web;
     using System.Web.Mvc;
     using NLog;

     /// <summary>
     /// 生成静态文件
     /// </summary>
     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = true)]
     public class GenerateStaticFileAttribute : ActionFilterAttribute
     {
         #region 私有属性

         private static readonly Logger logger = LogManager.GetCurrentClassLogger();

         #endregion

         #region 公共属性

         /// <summary>
         /// 过期时间,以小时为单位
         /// </summary>
         public int Expiration { get; set; }

         /// <summary>
         /// 文件后缀名
         /// </summary>
         public string Suffix { get; set; }

         /// <summary>
         /// 缓存目录
         /// </summary>
         public string CacheDirectory { get; set; }

         /// <summary>
         /// 指定生成的文件名
         /// </summary>
         public string FileName { get; set; }

         #endregion

         #region 构造函数

         /// <summary>
         /// 默认构造函数
         /// </summary>
         public GenerateStaticFileAttribute()
         {
             Expiration = 1;
             CacheDirectory = AppDomain.CurrentDomain.BaseDirectory;
         }

         #endregion

         #region 方法

         public override void OnResultExecuted(ResultExecutedContext filterContext)
         {
             var fileInfo = GetCacheFileInfo(filterContext);

             if ((fileInfo.Exists && fileInfo.CreationTime.AddHours(Expiration) < DateTime.Now) || !fileInfo.Exists)
             {
                 var deleted = false;

                 try
                 {
                     if (fileInfo.Exists)
                     {
                         fileInfo.Delete();
                     }

                     deleted = true;
                 }
                 catch (Exception ex)
                 {
                     logger.Error("删除文件:{0}发生异常:{1}", fileInfo.FullName, ex.StackTrace);
                 }

                 var created = false;

                 try
                 {
                     if (!fileInfo.Directory.Exists)
                     {
                         fileInfo.Directory.Create();
                     }

                     created = true;
                 }
                 catch (IOException ex)
                 {
                     logger.Error("创建目录:{0}发生异常:{1}", fileInfo.DirectoryName, ex.StackTrace);
                 }

                 if (deleted && created)
                 {
                     FileStream fileStream = null;
                     StreamWriter streamWriter = null;

                     try
                     {
                         var viewResult = filterContext.Result as ViewResult;
                         fileStream = new FileStream(fileInfo.FullName, FileMode.CreateNew, FileAccess.Write, FileShare.None);
                         streamWriter = new StreamWriter(fileStream);
                         var viewContext = new ViewContext(filterContext.Controller.ControllerContext, viewResult.View, viewResult.ViewData, viewResult.TempData, streamWriter);
                         viewResult.View.Render(viewContext, streamWriter);
                     }
                     catch (Exception ex)
                     {
                         logger.Error("生成缓存文件:{0}发生异常:{1}", fileInfo.FullName, ex.StackTrace);
                     }
                     finally
                     {
                         if (streamWriter != null)
                         {
                             streamWriter.Close();
                         }

                         if (fileStream != null)
                         {
                             fileStream.Close();
                         }
                     }
                 }
             }
         }

         /// <summary>
         /// 生成文件Key
         /// </summary>
         /// <param name="controllerContext">ControllerContext</param>
         /// <returns>文件Key</returns>
         protected virtual string GenerateKey(ControllerContext controllerContext)
         {
             var url = controllerContext.HttpContext.Request.Url.ToString();

             if (string.IsNullOrWhiteSpace(url))
             {
                 return null;
             }

             var th = new TigerHash();
             var data = th.ComputeHash(Encoding.Unicode.GetBytes(url));
             var key = Convert.ToBase64String(data, Base64FormattingOptions.None);
             key = HttpUtility.UrlEncode(key);

             return key;
         }

         /// <summary>
         /// 获取静态的文件信息
         /// </summary>
         /// <param name="controllerContext">ControllerContext</param>
         /// <returns>缓存文件信息</returns>
         protected virtual FileInfo GetCacheFileInfo(ControllerContext controllerContext)
         {
             var fileName = string.Empty;

             if (string.IsNullOrWhiteSpace(FileName))
             {
                 var key = GenerateKey(controllerContext);

                 if (!string.IsNullOrWhiteSpace(key))
                 {
                     fileName = Path.Combine(CacheDirectory, string.IsNullOrWhiteSpace(Suffix) ? key : string.Format("{0}.{1}", key, Suffix));
                 }
             }
             else
             {
                 fileName = Path.Combine(CacheDirectory, FileName);
             }

             return new FileInfo(fileName);
         }

         #endregion
     }

如果大家对于生成的文件和目录有特殊的要求,那可以重写GetCacheFileInfo方法,比如按照日期生成目录等等更复杂的目录和文件结构。当然以上代码只是提供了生成静态页的方法,但是访问如何解决呢? 访问静态文件和规则就需要在HttpApplication的Application_BeginRequest实现了。首先可以设置需要静态化访问的路由地址以html结尾。下面的是一个用于首页的静态化访问的实现,很简单,当然你可以实现比较复杂的逻辑,比如根据文件时间来判断是否应该访问静态文件等等。

protected void Application_BeginRequest(object sender, EventArgs e)
         {
             StaticContentRewrite();
         }

         /// <summary>
         /// 处理静态发布内容
         /// </summary>
         private void StaticContentRewrite()
         {
             if (Context.Request.FilePath == "/" || Context.Request.FilePath.StartsWith("/index.html", StringComparison.OrdinalIgnoreCase))
             {
                 if (File.Exists(Server.MapPath("index.html")))
                 {
                     Context.RewritePath("index.html");
                 }
             }
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