asp.net mvc 静态化

静态化的基本理解就是,常用的资源以文本形式保存,客户端访问时无需经过程序处理,直接下载

但是不存在的文件需要经过程序处理,文件内容如果需要有更动或删除,则直接删除文件本身

1.IIS Express 添加对json mine文件支持

在IIS Express文件夹里 运行以下命令

 appcmd set config /section:staticContent /+[fileExtension='.json',mimeType='application/json']

2.IIS里添加 json mine文件支持

 点击添加 

 这样 iis 和 iis express都可以直接访问已存在的静态资源(*.json)

3. 添加路由(如果不存在的文件如何处理)

在 routeConfig.cs文件里 添加 

routes.MapRoute(
name: "H5Jsonp",
url: "Content/H5/{filename}.json",
defaults: new { controller = "H5", action = "JosnpFile" });

 注意:文件路径一定要放在 {WebRoot}/Content/H5/下面

4.添加 controller

/// <summary>
    /// Json文件
    /// </summary>
    [StaticJsonFile("H5")]
    public class H5Controller : Controller
    {
     
        /// <summary>
        /// JsonpFile
        /// </summary>
        /// <param name="filename">json文件名</param>
        /// <returns></returns>
        public ActionResult JosnpFile(string filename)
        {
            return Content("");
        }
    }

5.核心代码

/// <summary>
    /// 文件静态化特性类
    /// </summary>
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = true)]
    public class StaticJsonFileAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// 文件名
        /// </summary>
        private string FileName { get; set; }

        /// <summary>
        /// 文件扩展名
        /// </summary>
        private string Suffix { get; set; }

        /// <summary>
        /// 静态化文件存放路径
        /// </summary>
        private string FileDirectory { get; set; }

        /// <summary>
        /// 类型
        /// </summary>
        private string Type { get; set; }

        /// <summary>
        /// 文件扩展字典
        /// </summary>
        private static readonly Dictionary<string, string> FileSuffixByTypeDirectory;

        /// <summary>
        /// 文件扩展字典
        /// </summary>
        private static Dictionary<string, object> LockDict = new Dictionary<string, object>();

        /// <summary>
        /// .ctor
        /// </summary>
        static StaticJsonFileAttribute()
        {

            FileSuffixByTypeDirectory = new Dictionary<string, string>()
            {
                { "H5", ".json" },
            };
        }

        /// <summary>
        /// .ctor
        /// </summary>
        public StaticJsonFileAttribute()
            : this("H5")
        {

        }

        /// <summary>
        /// .ctor
        /// </summary>
        /// <param name="type"></param>
        public StaticJsonFileAttribute(string type)
        {
            Type = type;
            FileDirectory = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, Type);
            if (FileSuffixByTypeDirectory.ContainsKey(type))
            {
                Suffix = FileSuffixByTypeDirectory[type];
            }
        }

        /// <summary>
        /// Action执行前过滤器
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (string.IsNullOrEmpty(Suffix))
            {
                return;
            }

            string parmaValue = null;
            //获取参数值

            var parameterInfo = filterContext.Controller.ValueProvider.GetValue("filename");
            if (parameterInfo == null)
            {
                return;
            }

            parmaValue = parameterInfo.AttemptedValue;
            if (string.IsNullOrEmpty(parmaValue))
            {
                return;
            }

            FileName = parmaValue;
            var lockKey = Type + ":" + FileName;
            if (!LockDict.ContainsKey(lockKey))
            {
                LockDict.Add(lockKey, new object());
            }

            var fileInfo = GetFileInfoByRequestUrl(filterContext);
            if (fileInfo == null)
            {
                return;
            }
//在实用时,这里应当调用相应的服务,获取数据
//建议在类里设置一个IGetData 字段,由autofac自动注入,在这里直接调用即可
            var dict = new Dictionary<string, string>();
            dict.Add("H5.App.AdText", "你是个大笨蛋!");
            var content = dict.ToJsonNoneFormat();
            System.Threading.Tasks.Task.Run(() =>
            {
                if (!fileInfo.Exists)
                {
                    lock (LockDict[lockKey])
                    {   //下面其实应当再加上 if(!fileInfo.exiests)的判断
                        FileStream fileStream = null;

                        try
                        {
                            fileStream = new FileStream(fileInfo.FullName, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None);
                            var bytes = Encoding.UTF8.GetBytes(content);
                            fileStream.Write(bytes, 0, bytes.Length);
                        }
                        finally
                        {
                            if (fileStream != null) fileStream.Close();
                        }
                    }
                }
            });

            filterContext.Result = new JsonpResult("callback")
            {
                JsonRequestBehavior = JsonRequestBehavior.AllowGet,
                Data = dict,
            };
        }

        /// <summary>
        /// 根据请求定义文件路径
        /// </summary>
        /// <param name="controllerContext"></param>
        /// <returns></returns>
        protected virtual FileInfo GetFileInfoByRequestUrl(ControllerContext controllerContext)
        {
            if (!string.IsNullOrWhiteSpace(FileName))
            {
                var key = FileName.Replace(Suffix, "");
                var fileName = Path.Combine(FileDirectory, string.Format("{0}{1}", key, Suffix));

                return new FileInfo(fileName);
            }

            return null;
        }
    }

6. jsonp类

/// <summary>
    /// Jsonp 的结果
    /// </summary>
    public class JsonpResult : JsonResult
    {
        /// <summary>
        /// .ctor
        /// Jsonp
        /// </summary>
        public JsonpResult()
        {
            this.Callback = "callback";
        }

        /// <summary>
        /// .ctor
        /// Jsonp
        /// </summary>
        /// <param name="callback">callback</param>
        public JsonpResult(string callback)
        {
            this.Callback = callback;
        }

        /// <summary>
        /// Jsonp 回调的 function 名称，默认为 callback
        /// </summary>
        public string Callback { get; set; }

        /// <summary>
        /// ExecuteResult
        /// </summary>
        /// <param name="context">context</param>
        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }

            var request = context.HttpContext.Request;
            var response = context.HttpContext.Response;
            string jsoncallback = (context.RouteData.Values[this.Callback] as string) ?? request[this.Callback];
            if (string.IsNullOrEmpty(jsoncallback))
            {
                jsoncallback = "callback" + DateTime.Now.Ticks.ToString();
            }

            if (string.IsNullOrEmpty(base.ContentType))
            {
                base.ContentType = "application/x-javascript";
            }

            response.Write(string.Format("{0}(", jsoncallback));

            response.Headers.Add("P3P", "CP=CAO PSA OUR");
            response.Headers.Add("Access-Control-Allow-Origin", "*");

            base.ExecuteResult(context);
            if (!string.IsNullOrEmpty(jsoncallback))
            {
                response.Write(")");
            }
        }
    }

7.调用

如

http://localhost:6248/content/H5/58b92c3f2213028b202298209.json?_=1488857755563&callback=fn_58b92c3f2213028b22298209