.NET中怎么利用HttpListener实现Http服务-创新互联
今天就跟大家聊聊有关.NET中怎么利用HttpListener实现Http服务,可能很多人都不太了解,为了让大家更加了解,小编给大家总结了以下内容,希望大家根据这篇文章可以有所收获。
创新互联建站一直秉承“诚信做人,踏实做事”的原则,不欺瞒客户,是我们最起码的底线! 以服务为基础,以质量求生存,以技术求发展,成交一个客户多一个朋友!为您提供成都网站制作、网站设计、成都网页设计、小程序定制开发、成都网站开发、成都网站制作、成都软件开发、app软件开发公司是成都本地专业的网站建设和网站设计公司,等你一起来见证!1.创建一个HTTP侦听器对象并初始化
2.添加需要监听的URI 前缀
3.开始侦听来自客户端的请求
4.处理客户端的Http请求
5.关闭HTTP侦听器
例如:我们要实现一个简单Http服务,进行文件的下载,或者进行一些其他的操作,例如要发送邮件,使用HttpListener监听,处理邮件队列,避免在网站上的同步等待。以及获取一些缓存的数据等等行为
using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Text; using System.Threading; using System.Web; using System.IO; using Newtonsoft.Json; namespace HttpListenerApp { ////// HttpRequest逻辑处理 /// public class HttpProvider { private static HttpListener httpFiledownload; //文件下载处理请求监听 private static HttpListener httOtherRequest; //其他超做请求监听 ////// 开启HttpListener监听 /// public static void Init() { httpFiledownload = new HttpListener(); //创建监听实例 httpFiledownload.Prefixes.Add("http://10.0.0.217:20009/FileManageApi/Download/"); //添加监听地址 注意是以/结尾。 httpFiledownload.Start(); //允许该监听地址接受请求的传入。 Thread ThreadhttpFiledownload = new Thread(new ThreadStart(GethttpFiledownload)); //创建开启一个线程监听该地址得请求 ThreadhttpFiledownload.Start(); httOtherRequest = new HttpListener(); httOtherRequest.Prefixes.Add("http://10.0.0.217:20009/BehaviorApi/EmailSend/"); //添加监听地址 注意是以/结尾。 httOtherRequest.Start(); //允许该监听地址接受请求的传入。 Thread ThreadhttOtherRequest = new Thread(new ThreadStart(GethttOtherRequest)); ThreadhttOtherRequest.Start(); } ////// 执行文件下载处理请求监听行为 /// public static void GethttpFiledownload() { while (true) { HttpListenerContext requestContext = httpFiledownload.GetContext(); //接受到新的请求 try { //reecontext 为开启线程传入的 requestContext请求对象 Thread subthread = new Thread(new ParameterizedThreadStart((reecontext) => { Console.WriteLine("执行文件处理请求监听行为"); var request = (HttpListenerContext)reecontext; var image = HttpUtility.UrlDecode(request.Request.QueryString["imgname"]); //接受GET请求过来的参数; string filepath = AppDomain.CurrentDomain.BaseDirectory + image; if (!File.Exists(filepath)) { filepath = AppDomain.CurrentDomain.BaseDirectory + "default.jpg"; //下载默认图片 } using (FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read)) { byte[] buffer = new byte[fs.Length]; fs.Read(buffer, 0, (int)fs.Length); //将文件读到缓存区 request.Response.StatusCode = 200; request.Response.Headers.Add("Access-Control-Allow-Origin", "*"); request.Response.ContentType = "image/jpg"; request.Response.ContentLength74 = buffer.Length; var output = request.Response.OutputStream; //获取请求流 output.Write(buffer, 0, buffer.Length); //将缓存区的字节数写入当前请求流返回 output.Close(); } })); subthread.Start(requestContext); //开启处理线程处理下载文件 } catch (Exception ex) { try { requestContext.Response.StatusCode = 500; requestContext.Response.ContentType = "application/text"; requestContext.Response.ContentEncoding = Encoding.UTF8; byte[] buffer = System.Text.Encoding.UTF8.GetBytes("System Error"); //对客户端输出相应信息. requestContext.Response.ContentLength74 = buffer.Length; System.IO.Stream output = requestContext.Response.OutputStream; output.Write(buffer, 0, buffer.Length); //关闭输出流,释放相应资源 output.Close(); } catch { } } } } ////// 执行其他超做请求监听行为 /// public static void GethttOtherRequest() { while (true) { HttpListenerContext requestContext = httOtherRequest.GetContext(); //接受到新的请求 try { //reecontext 为开启线程传入的 requestContext请求对象 Thread subthread = new Thread(new ParameterizedThreadStart((reecontext) => { Console.WriteLine("执行其他超做请求监听行为"); var request = (HttpListenerContext)reecontext; var msg = HttpUtility.UrlDecode(request.Request.QueryString["behavior"]); //接受GET请求过来的参数; //在此处执行你需要进行的操作>>比如什么缓存数据读取,队列消息处理,邮件消息队列添加等等。 request.Response.StatusCode = 200; request.Response.Headers.Add("Access-Control-Allow-Origin", "*"); request.Response.ContentType = "application/json"; requestContext.Response.ContentEncoding = Encoding.UTF8; byte[] buffer = System.Text.Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(new { success = true, behavior = msg })); request.Response.ContentLength74 = buffer.Length; var output = request.Response.OutputStream; output.Write(buffer, 0, buffer.Length); output.Close(); })); subthread.Start(requestContext); //开启处理线程处理下载文件 } catch (Exception ex) { try { requestContext.Response.StatusCode = 500; requestContext.Response.ContentType = "application/text"; requestContext.Response.ContentEncoding = Encoding.UTF8; byte[] buffer = System.Text.Encoding.UTF8.GetBytes("System Error"); //对客户端输出相应信息. requestContext.Response.ContentLength74 = buffer.Length; System.IO.Stream output = requestContext.Response.OutputStream; output.Write(buffer, 0, buffer.Length); //关闭输出流,释放相应资源 output.Close(); } catch { } } } } } }
调用方式:注意这里启动程序必须以管理员身份运行,因为上午的监听需要开启端口,所有需要以管理员身份运行。
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace HttpListenerApp { class Program { static void Main(string[] args) { //开启请求监听 HttpProvider.Init(); } } }
执行后的结果为:
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