.Net使用HttpModule过滤请求

要实现HttpModule，必须实现接口IHttpModule。

using System;
namespace System.Web
{
    public interface IHttpModule
    {
        //   销毁不再被HttpModule使用的资源
        void Dispose();
        // 初始化一个Module,为捕获HttpRequest做准备
        void Init(HttpApplication context);
    }
}

下面是自己的HttpModule

    /// <summary>
    /// 需要在网站的 Web.config 文件中配置此模块,向 IIS 注册它，然后才能使用它。
    /// </summary>
    public class MyHttpModule : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.PreRequestHandlerExecute += new EventHandler(Application_PreRequestHandlerExecute);
            context.BeginRequest += new EventHandler(Application_BeginRequest);
            context.EndRequest += new EventHandler(Application_EndRequest);
        }
        public void Application_PreRequestHandlerExecute(object sender, EventArgs e)
        {
            HttpApplication application = sender as HttpApplication;
            string url = application.Request.RawUrl;
            if (url.Contains("HttpModule_HtmlTest"))
            {
                application.Response.Redirect("~/HttpModule_Index.html");
                application.Response.End();
            }
            else if (url.Contains("HttpModule_JsonTest"))
            {
                dynamic obj = new System.Dynamic.ExpandoObject();
                obj = new
                {
                    res = 0,
                    msg = "请求被拦截！",
                };
                string jsonRes = Newtonsoft.Json.JsonConvert.SerializeObject(obj);

                application.Response.Write(jsonRes);
                application.Response.ContentType = "text/html;charset=UTF-8";
                application.Response.End();
            }
        }
        public void Application_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = sender as HttpApplication;
            HttpContext context = application.Context;
            HttpResponse response = context.Response;
            response.Write("这是来自自定义HttpModule中有BeginRequest");
        }
        public void Application_EndRequest(object sender, EventArgs e)
        {
            HttpApplication application = sender as HttpApplication;
            HttpContext context = application.Context;
            HttpResponse response = context.Response;
            response.Write("这是来自自定义HttpModule中有EndRequest");
        }

        public void Dispose()
        {
        }
    }

web.config

 1 <!--自定义过滤器IIS6(对IIS7的经典模式起作用)      -->
 2 <system.web>
 3     <httpModules>
 4       <add name="myHttpModule" type="namespace.MyHttpModule, namespace" />
 5     </httpModules>
 6   </system.web>
 7   <system.webServer>
 8     <!--  在IIS7的集成模式下，加上了preCondition="managedHandler"这个配置项后，就不会去处理静态文件（.html .css .js .jpeg等）的请求了，只会处理托管文件（aspx， ascx 及 MVC等）的请求
 9       <add name="webServerHttpModule" type="namespace.MyHttpModule, namespace" preCondition="managedHandler" />
10     -->
11     <modules>
12       <add name="webServerHttpModule" type="namespace.MyHttpModule, namespace" />
13     </modules>
14   </system.webServer>

View Code