基于Redis的ASP.NET与js(AJAX)的聊天程序[js长连接][伪推送]
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！
改成了长轮询方式，js也加了连接超时保护，下载地址：
http://download.csdn.net/detail/cjy37/4004949