在asp.net程序中,我们可以通过配置url的path路径的方式,将某个path路径下的请求交给指定的IHttpHandler去处理,这便是对request请求进行编程。
一、新建一个framework类库
该类库中包含我们需要的IHttpHandler处理程序。
新建一个名为ApiHttpHandler的类,并继承IHttpHandler接口。如下代码:
namespace MyHttpHandler { public class ApiHttpHandler : IHttpHandler { public bool IsReusable => true; public void ProcessRequest(HttpContext context) { context.Response.Write("ApiHttpHandler"); } } }
二、新建一个空的项目
将IHttpHandler配置到web.config的handlers节点,如下所示:
<system.webServer> <handlers> <!--使用单个IHttpHandler--> <add name="apiHttpHandler" type="MyHttpHandler.ApiHttpHandler,MyHttpHandler" path="/api/*" verb="*"/> </handlers> </system.webServer>
name:在配置文件中对当前handler自定义的名称;
type:组成格式 "handler类名,handler所在的程序集名称";
path:当前handler需要处理的请求的path路径;
verb:请求的方式,如:Post,Get等。
新建一些html页面来测试,web项目程序结构如下:
Login.html就是默认的首页,在项目的属性中配置:
Login.html页面内容如下:
启动程序,查看结果:
三、使用IHttpHandlerFactory配置多个IHttpHandler
新建一个MultiHandler类,继承IHttpHandlerFactory。如下代码:
namespace MyHttpHandler { //使用IHttpHandlerFactory来集中管理多个HttpHandler的处理 public class MultiHandler : IHttpHandlerFactory { //自定义的字典,key为路径,value为对应的IHttpHandler处理器 protected IDictionary<string, IHttpHandler> handlers = new Dictionary<string, IHttpHandler> { { "book",new BookHttpHandler()}, { "student",new StudentHttpHandler()} }; //返回一个实现了IHttpHandler接口的实例; public IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated) { IHttpHandler rc = null; //根据第一级路径名来区分 //如 /apis/book/* 需要BookHttpHandler来处理 var path = context.Request.Path?.Split(new string[] { "/"},StringSplitOptions.RemoveEmptyEntries)?.Skip(1)?.Take(1)?.FirstOrDefault()??""; if (handlers.Keys.Contains(path.ToLower())) rc = handlers[path]; else rc = new DefaultHandler(); return rc; } //使得Factory可以重复使用一个已经存在Handler实例。 public void ReleaseHandler(IHttpHandler handler) { // throw new NotImplementedException(); } } }
web项目的web.config如下配置:
<system.webServer> <handlers> <!--使用单个IHttpHandler--> <add name="apiHttpHandler" type="MyHttpHandler.ApiHttpHandler,MyHttpHandler" path="/api/*" verb="*"/> <add name="fileHttpHandler" type="MyHttpHandler.FileHttpHandler,MyHttpHandler" path="/file/*" verb="POST"/> <!--使用IHttpHandlerFactory来集中管理多个HttpHandler的处理--> <add name="multiHandlers" type="MyHttpHandler.MultiHandler,MyHttpHandler" path="/apis/*" verb="*"/> </handlers> </system.webServer>
Login.html的内容如下:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> </head> <body> <div id="app"> apiResp:{{apiResp}} <br /> fileResp: {{fileResp}} <br /> bookResp: {{bookResp}} <br /> studentResp: {{studentResp}} <br /> defaultResp: {{defaultResp}} <br /> <button @click.self.prevent="turnToHome">转到home页面</button> </div> <script src="js/vue.js"></script> <script src="js/jquery-3.3.1.min.js"></script> <script> var app = new Vue({ el: "#app", data: { apiResp: "", fileResp: "", bookResp: "", studentResp: "", defaultResp:"" }, methods: { turnToHome: function (event) { window.location.href = "html/Home.html"; } }, created: function () { //this.resp = "hello"; var that = this; $.ajax({ type: "post", url: "/api/hello", data: null, contentType: "text/plain", success: function (data) { if (data) that.apiResp = data; else that.apiResp = "no data"; }, error: function (err) { that.apiResp = "error"; } }); $.ajax({ type: "post", url: "/file/hello", data: null, contentType: "text/plain", success: function (data) { if (data) that.fileResp = data; else that.fileResp = "no data"; }, error: function (err) { that.fileResp = "error"; } }); $.ajax({ type: "post", url: "/apis/book/hello", data: null, contentType: "text/plain", success: function (data) { if (data) that.bookResp = data; else that.bookResp = "no data"; }, error: function (err) { that.bookResp = "error"; } }); $.ajax({ type: "post", url: "/apis/student/hello", data: null, contentType: "text/plain", success: function (data) { if (data) that.studentResp = data; else that.studentResp = "no data"; }, error: function (err) { that.studentResp = "error"; } }); $.ajax({ type: "post", url: "/apis/default/hello", data: null, contentType: "text/plain", success: function (data) { if (data) that.defaultResp = data; else that.defaultResp = "no data"; }, error: function (err) { that.defaultResp = "error"; } }); } }); </script> </body> </html>
启动程序后的结果如下图所示:
我们可以使用IHttpHandler来实现图片的防盗链和其他的功能,用处多多!
参考文档:http://www.cnblogs.com/JimmyZhang/archive/2007/09/15/894124.html
原文地址:https://www.cnblogs.com/williamwsj/p/10264520.html
时间: 2024-10-08 15:20:33