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C#网络编程系列文章(七)之UdpClient实现异步UDP服务器

时间:2015-03-16 12:53:51      阅读:187      评论:0      收藏:0      [点我收藏+]

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原创性声明

本文作者:小竹zz 本文地址http://blog.csdn.net/zhujunxxxxx/article/details/44258719 转载请注明出处

本文介绍

UdpClient 类在同步阻塞模式中为发送和接收无连接的 UDP 数据包而提供了简单的方法。因为 UDP 是一种无连接的传输协议,所以你不需要在发送和接收数据之前建立任何远程主机连接。你只需要按照下列方式来建立默认的远程主机选项:
使用远程主机名称和端口号作为参数来创建 UdpClient 类的实例。
创建 UdpClient 类的实例然后调用 Connect 方法。
你可以使用任何由 UdpClient 所提供的发送方法把数据发送给远程设备。然后使用 Receive 方法来接收来自于远程主机的数据。
提示:如果你已经指定了一个默认的远程主机,就不要使用主机名称或者 IPEndPoint 来调用 Send 方法。如果你这样做,那么 UdpClient 将会抛出一个异常。
UdpClient 方法同样允许你发送和接收多点传送的数据包。而使用 JoinMulticastGroup 方法可以把 UdpClient 订阅到多点传送分组。也可以使用 DropMulticastGroup 方法把 UdpClient 从多点传送分组的订阅中取消。

本节介绍使用UdpClient实现一个异步的高性能UDP服务器

UdpClient异步UDP服务器

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace NetFrame.Net.UDP.Listener.Asynchronous
{
    /// <summary>
    /// UdpClient 实现异步UDP服务器
    /// </summary>
    public class AsyncUDPServer
    {
        #region Fields
        /// <summary>
        /// 服务器程序允许的最大客户端连接数
        /// </summary>
        private int _maxClient;

        /// <summary>
        /// 当前的连接的客户端数
        /// </summary>
        //private int _clientCount;

        /// <summary>
        /// 服务器使用的异步UdpClient
        /// </summary>
        private UdpClient _server;

        /// <summary>
        /// 客户端会话列表
        /// </summary>
        //private List<AsyncUDPState> _clients;

        private bool disposed = false;

        /// <summary>
        /// 数据接受缓冲区
        /// </summary>
        private byte[] _recvBuffer;

        #endregion

        #region Properties

        /// <summary>
        /// 服务器是否正在运行
        /// </summary>
        public bool IsRunning { get; private set; }
        /// <summary>
        /// 监听的IP地址
        /// </summary>
        public IPAddress Address { get; private set; }
        /// <summary>
        /// 监听的端口
        /// </summary>
        public int Port { get; private set; }
        /// <summary>
        /// 通信使用的编码
        /// </summary>
        public Encoding Encoding { get; set; }

        #endregion

        #region 构造函数

        /// <summary>
        /// 异步UdpClient UDP服务器
        /// </summary>
        /// <param name="listenPort">监听的端口</param>
        public AsyncUDPServer(int listenPort)
            : this(IPAddress.Any, listenPort,1024)
        {
        }

        /// <summary>
        /// 异步UdpClient UDP服务器
        /// </summary>
        /// <param name="localEP">监听的终结点</param>
        public AsyncUDPServer(IPEndPoint localEP)
            : this(localEP.Address, localEP.Port,1024)
        {
        }

        /// <summary>
        /// 异步UdpClient UDP服务器
        /// </summary>
        /// <param name="localIPAddress">监听的IP地址</param>
        /// <param name="listenPort">监听的端口</param>
        /// <param name="maxClient">最大客户端数量</param>
        public AsyncUDPServer(IPAddress localIPAddress, int listenPort, int maxClient)
        {
            this.Address = localIPAddress;
            this.Port = listenPort;
            this.Encoding = Encoding.Default;

            _maxClient = maxClient;
            //_clients = new List<AsyncUDPSocketState>();
            _server = new UdpClient(new IPEndPoint(this.Address, this.Port));

            _recvBuffer=new byte[_server.Client.ReceiveBufferSize];
        }

        #endregion

        #region Method
        /// <summary>
        /// 启动服务器
        /// </summary>
        /// <returns>异步TCP服务器</returns>
        public void Start()
        {
            if (!IsRunning)
            {
                IsRunning = true;
                _server.EnableBroadcast = true;
                _server.BeginReceive(ReceiveDataAsync, null);
            }
        }

        /// <summary>
        /// 停止服务器
        /// </summary>
        public void Stop()
        {
            if (IsRunning)
            {
                IsRunning = false;
                _server.Close();
                //TODO 关闭对所有客户端的连接

            }
        }

        /// <summary>
        /// 接收数据的方法
        /// </summary>
        /// <param name="ar"></param>
        private void ReceiveDataAsync(IAsyncResult ar)
        {
            IPEndPoint remote=null;
            byte[] buffer = null;
            try
            {
                buffer = _server.EndReceive(ar, ref remote);

                //触发数据收到事件
                RaiseDataReceived(null);
            }
            catch (Exception)
            {
                //TODO 处理异常
                RaiseOtherException(null);
            }
            finally
            {
                if (IsRunning && _server != null)
                    _server.BeginReceive(ReceiveDataAsync, null);
            }
        }

        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="remote"></param>
        public void Send(string msg, IPEndPoint remote)
        {
            byte[] data = Encoding.Default.GetBytes(msg);
            try
            {
                RaisePrepareSend(null);
                _server.BeginSend(data, data.Length, new AsyncCallback(SendCallback), null);
            }
            catch (Exception)
            {
                //TODO 异常处理
                RaiseOtherException(null);
            }
        }

        private void SendCallback(IAsyncResult ar)
        {
            if (ar.IsCompleted)
            {
                try
                {
                    _server.EndSend(ar);
                    //消息发送完毕事件
                    RaiseCompletedSend(null);
                }
                catch (Exception)
                {
                    //TODO 数据发送失败事件
                    RaiseOtherException(null);
                }
            }

        }
        #endregion

        #region 事件
        /// <summary>
        /// 接收到数据事件
        /// </summary>
        public event EventHandler<AsyncUDPEventArgs> DataReceived;

        private void RaiseDataReceived(AsyncUDPState state)
        {
            if (DataReceived != null)
            {
                DataReceived(this, new AsyncUDPEventArgs(state));
            }
        }

        /// <summary>
        /// 发送数据前的事件
        /// </summary>
        public event EventHandler<AsyncUDPEventArgs> PrepareSend;

        /// <summary>
        /// 触发发送数据前的事件
        /// </summary>
        /// <param name="state"></param>
        private void RaisePrepareSend(AsyncUDPState state)
        {
            if (PrepareSend != null)
            {
                PrepareSend(this, new AsyncUDPEventArgs(state));
            }
        }

        /// <summary>
        /// 数据发送完毕事件
        /// </summary>
        public event EventHandler<AsyncUDPEventArgs> CompletedSend;

        /// <summary>
        /// 触发数据发送完毕的事件
        /// </summary>
        /// <param name="state"></param>
        private void RaiseCompletedSend(AsyncUDPState state)
        {
            if (CompletedSend != null)
            {
                CompletedSend(this, new AsyncUDPEventArgs(state));
            }
        }

        /// <summary>
        /// 网络错误事件
        /// </summary>
        public event EventHandler<AsyncUDPEventArgs> NetError;
        /// <summary>
        /// 触发网络错误事件
        /// </summary>
        /// <param name="state"></param>
        private void RaiseNetError(AsyncUDPState state)
        {
            if (NetError != null)
            {
                NetError(this, new AsyncUDPEventArgs(state));
            }
        }

        /// <summary>
        /// 异常事件
        /// </summary>
        public event EventHandler<AsyncUDPEventArgs> OtherException;
        /// <summary>
        /// 触发异常事件
        /// </summary>
        /// <param name="state"></param>
        private void RaiseOtherException(AsyncUDPState state, string descrip)
        {
            if (OtherException != null)
            {
                OtherException(this, new AsyncUDPEventArgs(descrip, state));
            }
        }
        private void RaiseOtherException(AsyncUDPState state)
        {
            RaiseOtherException(state, "");
        }
        #endregion

        #region Close
        /// <summary>
        /// 关闭一个与客户端之间的会话
        /// </summary>
        /// <param name="state">需要关闭的客户端会话对象</param>
        public void Close(AsyncUDPState state)
        {
            if (state != null)
            {
                //_clients.Remove(state);
                //_clientCount--;
                //TODO 触发关闭事件
            }
        }
        /// <summary>
        /// 关闭所有的客户端会话,与所有的客户端连接会断开
        /// </summary>
        public void CloseAllClient()
        {
            //foreach (AsyncUDPSocketState client in _clients)
            //{
            //    Close(client);
            //}
            //_clientCount = 0;
            //_clients.Clear();
        }

        #endregion

        #region 释放
        /// <summary>
        /// Performs application-defined tasks associated with freeing, 
        /// releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        /// <summary>
        /// Releases unmanaged and - optionally - managed resources
        /// </summary>
        /// <param name="disposing"><c>true</c> to release 
        /// both managed and unmanaged resources; <c>false</c> 
        /// to release only unmanaged resources.</param>
        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    try
                    {
                        Stop();
                        if (_server != null)
                        {
                            _server = null;
                        }
                    }
                    catch (SocketException)
                    {
                        //TODO
                        RaiseOtherException(null);
                    }
                }
                disposed = true;
            }
        }
        #endregion
    }
}

客户端信息封装了类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace NetFrame.Net.UDP.Listener.Asynchronous
{
    public class AsyncUDPState
    {
        // Client   socket.
        public UdpClient udpClient = null;
        // Size of receive buffer.
        public const int BufferSize = 1024;
        // Receive buffer.
        public byte[] buffer = new byte[BufferSize];
        // Received data string.
        public StringBuilder sb = new StringBuilder();

        public IPEndPoint remote = new IPEndPoint(IPAddress.Any, 0);
    }
}
服务器事件参数类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace NetFrame.Net.UDP.Listener.Asynchronous
{
    /// <summary>
    /// UdpClient 异步UDP服务器事件参数类
    /// </summary>
    public class AsyncUDPEventArgs : EventArgs
    {
        /// <summary>
        /// 提示信息
        /// </summary>
        public string _msg;

        /// <summary>
        /// 客户端状态封装类
        /// </summary>
        public AsyncUDPState _state;

        /// <summary>
        /// 是否已经处理过了
        /// </summary>
        public bool IsHandled { get; set; }

        public AsyncUDPEventArgs(string msg)
        {
            this._msg = msg;
            IsHandled = false;
        }
        public AsyncUDPEventArgs(AsyncUDPState state)
        {
            this._state = state;
            IsHandled = false;
        }
        public AsyncUDPEventArgs(string msg, AsyncUDPState state)
        {
            this._msg = msg;
            this._state = state;
            IsHandled = false;
        }
    }
}



C#网络编程系列文章(七)之UdpClient实现异步UDP服务器

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原文地址:http://blog.csdn.net/zhujunxxxxx/article/details/44303743

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