上一篇文章中,我们提到使用IHttpAsyncHandler来进行UDP的收发操作。由于UDP模型比较简单,所以运行没什么问题。这一篇我主要是使用IHttpAsyncHandler来进行TCP的收发操作。由于TCP的模型比较复杂,所以在设计的时候,稍微麻烦了一些。
核心讲解
首先,我贴上代码,然后来逐一讲解:
using System;
using System.Web;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.IO; namespace SocketViaWeb
{
#region 写日志 public static class Logger
{
//写日志
public static void WriteLog(string content)
{
try
{
string timeStamp = DateTime.Now.ToString("yyyyMMdd");
string filePath = "C:\\TestLog." + timeStamp + ".txt";
string contentAll = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss ") + ":" + content + Environment.NewLine;
byte[] b = Encoding.Default.GetBytes(contentAll);
using (FileStream fs = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
{
fs.Write(b, , b.Length);
fs.Flush();
}
}
catch (Exception ex) { }
}
}
#endregion #region 返回异步执行结果
public class MyAsyncResult : IAsyncResult
{
public HttpContext contex;
public AsyncCallback cb;
public object extraData; public bool isCompleted = false; public MyAsyncResult(HttpContext contex, AsyncCallback cb, object extraData)
{
this.contex = contex;
this.cb = cb;
this.extraData = extraData;
} public void send(string resultStr)
{
this.contex.Response.Output.Write(resultStr);
} public object AsyncState
{
get { return null; }
} public System.Threading.WaitHandle AsyncWaitHandle
{
get { return null; }
} public bool CompletedSynchronously
{
//在网络连接或者流读取中,这里需要设置为True,否则前台是不能显示接收数据的。
get { return true; }
} public bool IsCompleted
{
get { return isCompleted; }
}
}
#endregion #region 异步执行对象
public static class myAsyncFunction
{
private static string resultResponse = string.Empty; //获取客户端数据
private static TcpListener tcpListener; private static MyAsyncResult asyncResult; //通知回传对象 // 把一个异步的请求对象传入以便于供操作
public static void Init(MyAsyncResult result,int port)
{
asyncResult = result;
if (tcpListener == null)
{
try
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("192.168.0.100"),port);
tcpListener = new TcpListener(endPoint);
tcpListener.Start();
}
catch (System.Net.Sockets.SocketException ex)
{
tcpListener = null;
throw new Exception(ex.Message);
}
}
} //接收客户端数据并将数据打印到前台
public static void AcceptClients()
{
TcpClient client = tcpListener.AcceptTcpClient();
byte[] bufferResult = new byte[];
NetworkStream readStream = client.GetStream();
readStream.Read(bufferResult, , bufferResult.Length);
resultResponse = System.Text.Encoding.Default.GetString(bufferResult); Logger.WriteLog("Receiving TCP Client Message: " + resultResponse);
asyncResult.send(resultResponse);
}
}
#endregion #region 异步执行请求
public class AsyncSocketHandler : IHttpAsyncHandler
{
private static object obj = new object(); public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
{
lock (obj)
{
int port = Int32.Parse(context.Request.QueryString["port"].ToString());
MyAsyncResult asyncResult = new MyAsyncResult(context, cb, extraData); //实例
myAsyncFunction.Init(asyncResult, port); //接收所有传入的异步对象
myAsyncFunction.AcceptClients(); //处理所有传入的异步对象
asyncResult.isCompleted = true;
return asyncResult;
}
} public void EndProcessRequest(IAsyncResult result)
{
MyAsyncResult asyncResult = result as MyAsyncResult;
if (asyncResult != null)
{
asyncResult.send(string.Empty);
}
} public bool IsReusable
{
get { return false; }
} public void ProcessRequest(HttpContext context)
{ }
}
#endregion
}
对于WriteLog函数,我就不讲了,主要是用来写日志的。
对于MyAsyncResult类,主要是用来接收处理状态并返回,在EndProcessRequest(IAsyncResult result)中可以还原对象,然后做一些善后的工作,比如关闭数据库,清空缓存等等。
对于myAsyncFunction类,这是我们执行的主体,里面的AcceptClients函数是我们执行的核心。
对于AsyncSocketHandler类,它继承自异步handler:IHttpAsyncHandler,主要是用来进行异步处理的。
在下面的代码中:
public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
{
lock (obj)
{
int port = Int32.Parse(context.Request.QueryString["port"].ToString());
MyAsyncResult asyncResult = new MyAsyncResult(context, cb, extraData); //实例
myAsyncFunction.Init(asyncResult, port); //接收所有传入的异步对象
myAsyncFunction.AcceptClients(); //处理所有传入的异步对象
asyncResult.isCompleted = true;
return asyncResult;
}
}
首先实例化MyAsyncResult对象,以便创建返回参数;然后初始化调用对象;初始化之后,开始调用我们的核心对象,也就是利用TCP接收Client的连接。最后返回执行对象。
public void EndProcessRequest(IAsyncResult result)
{
MyAsyncResult asyncResult = result as MyAsyncResult;
if (asyncResult != null)
{
asyncResult.send(string.Empty);
}
}
当异步执行完毕之后,就会进入EndProcessRequest函数,这个函数主要通过还原MyAsyncResult对象,实现清理等操作,这里我就不再赘述。
那么如何调用呢?
调用其实很简单,通过Ajax请求这个异步Handler,然后利用其Success方法打印出获取的对象就可以了。 需要注意的是,在Success方法中,我们可以再调用Ajax请求来实现循环获取Client Sockets。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Server.aspx.cs" Inherits="SocketViaWeb.Server" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>TCP服务器端</title>
<style type="text/css">
body
{
font-size:12px;
}
</style>
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$("#btnListen").bind("click", function () {
//setInterval(TriggerAjax, 1000);
TriggerAjax();
});
}); var array = new Array(); var TriggerAjax = function () {
var port = $("#txtPort").val();
$.ajax({
type: "GET",
url: "AsyncSocketHandler.ashx?port=" + port,
dataType: "text",
success: function (result) {
if (result != "") {
var myDate = new Date();
var message = myDate.toLocaleString() + " : " + result;
if (!array.contains(result)) {
$("#msg").append(message).append("<br>");
}
}
TriggerAjax(); //循环调用
},
error: function (result) {
TriggerAjax(); //循环调用
}
});
} Array.prototype.contains = function (elem) {
for (var i = 0; i < this.length; i++) {
if (this[i] == elem) {
return true;
}
}
return false;
} </script>
</head>
<body>
<div style="height: 390px; width: 435px;float:left;border:1px solid #B7D6BF;">
<div style="height:30px;width:100%;float:left;background:url('images/navEx.gif') repeat-x;line-height:30px;text-align:center;"><strong>服务端接收数据</strong></div>
<div style="float:left;width:100%;height:310px;border-bottom:1px solid #B7D6BF; overflow-x:auto;" id="msg"></div>
<div style="float:left;width:100%;height:50px;text-align:right;line-height:50px;">
绑定的本机端口:<input id="txtPort" type="text" style="width:40px;border:none;border-bottom:1px solid black;" value="10004" />
<input id="btnListen" type="button" value="监听" style="border:none;background:url('images/btn.gif') no-repeat;width:50px;height:20px;color:White;" />
<input id="btnStop" type="button" value="停止" style="border:none;background:url('images/btn.gif') no-repeat;width:50px;height:20px;color:White;" onclick="return btnStop_onclick()" />
</div>
</div>
</body>
</html>
实现效果
最后看看我们实现的效果吧:
源码下载
由于源码中有SignalR的示例,附件过大,我已经删除了相关的Signr附件,编译的时候,请首先运行 Install-Package Microsoft.AspNet.SignalR -version 1.0
来获取相关的版本。我百度网盘放了全版本的:http://pan.baidu.com/s/15SDGG
解决方案中的SocketViaWeb项目下的Server.aspx 为服务端,Client.aspx为客户端。