基于Redis的ASP.NET与js(AJAX)的聊天程序

首先是安装Redis, 此处略过n步...

然后，新建一个ASP.NET的MVC2的工程《MvcMessage》，需要下载ServiceStack.Redis并把dll复制到工程下，并正确引用。

好，下面开始贴代码了：

1. 在工程目录《Models》下新建类：Message.cs

using System; using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Globalization; using System.Linq; using System.Web; using System.Web.Mvc; using System.Web.Security; namespace MvcMessage.Models { //model public class Message { public long Id { get; set; } public string SendName { get; set; } public string SendTo { get; set; } public DateTime SendTime { get; set; } public string Msg { get; set; } public int SendType { get; set; } } }
2. 在工程目录《Controllers》下新建控制器：MessageController.cs

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using System.Threading; using ServiceStack.Redis; using MvcMessage.Models; namespace MvcMessage.Controllers { public class MessageController : AsyncController { static private Mutex mutex = new Mutex();//不了解的可以去看资料，这里不说了 static RedisClient redisClient = new RedisClient("172.18.1.240");//redis的IP,端口默认的则不用写 public ActionResult Index() { return View(); } public void SendMessageAsync() { mutex.WaitOne(); try { using (var msgs = redisClient.GetTypedClient<Message>())//Redis消息对象 { var m = new Message { Id = msgs.GetNextSequence(), Msg = HttpContext.Request["msg"], SendTime = Convert.ToDateTime(HttpContext.Request["time"]), SendType = Convert.ToInt32(HttpContext.Request["type"]), SendTo = HttpContext.Request["to"], SendName = HttpContext.Request["from"] }; if (m.SendType == 1) { m.SendTo = "All"; } msgs.Store(m);//保存到Redis msgs.ExpireAt(m.Id, DateTime.Now.AddSeconds(60 * 1000));//redis记录的过期 AsyncManager.Parameters["ret"] = new//构造返回对象格式 { code = 200, ret = "Send OK!", what = "" }; AsyncManager.OutstandingOperations.Decrement();//触发SendMessageCompleted的执行 } } catch (Exception ex) {//错误处理 AsyncManager.Parameters["ret"] = new { code = 500, ret = "", what = "Send error:"+ex.Message }; AsyncManager.OutstandingOperations.Decrement(); } mutex.ReleaseMutex(); } public ActionResult SendMessageCompleted(object ret) {//返回JSON对象 return Json(ret, JsonRequestBehavior.AllowGet); } public void GetMessageAsync() { mutex.WaitOne(); try { DateTime lastTime = Convert.ToDateTime(HttpContext.Request["time"]); string user = HttpContext.Request["sendName"]; using (var msgs = redisClient.GetTypedClient<Message>()) { var msgFromRedis = msgs.GetAll().Where<Message>( msg => msg.SendTime > lastTime && (msg.SendTo == user|| msg.SendType == 1) && msg.SendName != user );//从Redis取数据，并设置查询条件 var list = msgFromRedis.ToList<Message>();//查询结果 IDictionary<string, object> ret = new Dictionary<string, object>(); ret.Add("code", 200);//成功码 ret.Add("ret", list);//返回结果 ret.Add("what", ""); AsyncManager.Parameters["ret"] = ret;//返回对象格式 AsyncManager.OutstandingOperations.Decrement();//触发GetMessageCompleted的执行 } } catch (Exception ex) {//错误处理 IDictionary<string, object> ret = new Dictionary<string, object>(); ret.Add("code", 500);//失败码 ret.Add("ret", ""); ret.Add("what", ex.Message);//错误内容 AsyncManager.Parameters["ret"] = ret; AsyncManager.OutstandingOperations.Decrement(); } mutex.ReleaseMutex(); } public ActionResult GetMessageCompleted(IDictionary<string, object> ret) {//返回JSON对象 return Json(ret, JsonRequestBehavior.AllowGet); } } }
3. 在《Global.asax.cs》文件中注册Routes方法改为：

public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", // 路由名称 "{controller}/{action}/{id}", // 带有参数的 URL new { controller = "Message", action = "Index", id = UrlParameter.Optional } // 参数默认值 ); }4. 为Message控制器创建视图：《/Views/Message/Index.aspx》
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<dynamic>" %> <asp:Content ID="Content3" ContentPlaceHolderID="HeaderContent" runat="server"> <script src="../../Scripts/jquery-1.4.1.js" type="text/javascript"></script> <script src="../../Scripts/Message.js" type="text/javascript"></script> <style type="text/css"> #logs { width: 360px; height: 200px; } </style> </asp:Content> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Index </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Index</h2> <textarea id="logs"> waiting... </textarea> <div id="sendBox"> <br /> 昵称:<input type="text" id="sendName" name="sendName" value="" /> 发送给:<input type="radio" id="sendType1" name="sendType" checked="checked" value="1" />所有人 发送给:<input type="radio" id="sendType2" name="sendType" value="0" /><input type="text" id="sendTo" name="sendTo" value="" /> 内容:<input type="text" id="message" name="message" value="" /> <br /> <input type="submit" id="send" value="发送" onclick="sendMsg()"/> </div> </asp:Content> 5. 《Message.js》的内容：

//var i = 0; var lastTime = new Date();//首次打开网页时会以此时间开始取消息 $(document).ready(function () { $.ajaxSetup({ cache: false }); setInterval('long_polling(false)',5000);//每隔5秒取一次消息 }); //接收 function long_polling(s) { if (s) i++; var sendname = $('#sendName').val(); var sendtype = $('#sendType1').attr("checked") ? 1 : 0; var sendto = $('#sendTo').val(); var msg = $('#message').val(); var t = DateToString(lastTime); $.ajax({ url: '/Message/GetMessage', data: { 'sendName': sendname, 'time': t }, dataType: 'json', error: function () { long_polling(false); }, success: function (data) { if (data.code == 200) { var d; for (var item in data.ret) { if (data.ret[item].Msg) { d = ConvertJSONDateToJSDateObject(data.ret[item].SendTime); $('#logs').val(data.ret[item].SendName + "[" + DateToString(d) + "]对[" + (data.ret[item].SendType == 1 ? '所有人' : data.ret[item].SendTo) + "]说: " + data.ret[item].Msg + "\n" + $("#logs").val()); lastTime = d;//更新最后一个消息的时间 } } } else { $("#logs").val('error:' + data.what + '\n' + $("#logs").val()); } } }); } //发送 function sendMsg() { var sendname = $('#sendName').val(); var sendtype = $('#sendType1').attr("checked") ? 1 : 0; var sendto = $('#sendTo').val(); var msg = $('#message').val(); var d = new Date(); var t = DateToString(d); $.ajax({ url: '/Message/SendMessage', data: { 'from': sendname, 'type': sendtype, 'to': sendto, 'msg': msg, 'time': t }, dataType: 'json', success: function (data) { if (data.code == 200) { $("#logs").val(data.ret + '\n' + $("#logs").val()); } else { $("#logs").val(data.what + '\n' + $("#logs").val()); } } }); } //时间转换 function ConvertJSONDateToJSDateObject(JSONDateString) { var date = new Date(parseInt(JSONDateString.replace("/Date(", "").replace(")/", ""), 10)); return date; } function DateToString(d) { var t = d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate() + ' ' + d.getHours() + ':' + d.getMinutes() + ':' + d.getSeconds(); return t; }
ServiceStack.Redis的资料，实在是太少了，这篇文章算是研究Redis与C#应用的一个实例吧！