利用C#實(shí)現(xiàn)一個(gè)客戶端之間的通信

利用C#實(shí)現(xiàn)一個(gè)客戶端之間的通信？針對(duì)這個(gè)問(wèn)題，這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答，希望可以幫助更多想解決這個(gè)問(wèn)題的小伙伴找到更簡(jiǎn)單易行的方法。

首先在服務(wù)端新建一個(gè)serverSocket，對(duì)其進(jìn)行初始化（一般包含AddressFamily:IP地址類型，SocketType:Socket傳輸數(shù)據(jù)方式，ProtoType:傳輸協(xié)議）; 

接著我們要設(shè)置server端要綁定的IP:port;然后開(kāi)始監(jiān)聽(tīng)，并設(shè)置最多同時(shí)監(jiān)聽(tīng)多少個(gè)Client.

這時(shí)，服務(wù)端就在等待狀態(tài)，直到某一個(gè)Client連接到這個(gè)ip:port上，這時(shí)serverSocket.Accept()工作，獲得這個(gè)連接。（此時(shí)的連接是有地址信息的哦！記得保存） 

獲得連接之后，server就可以和這個(gè)Client進(jìn)行通信了,當(dāng)加入第二個(gè)Client（我們稱其為ClientB）時(shí)，Server接收到ClientB的消息，可以將這個(gè)消息轉(zhuǎn)發(fā)給前一個(gè)Client（我們稱其為ClientA），當(dāng)受到ClientA的消息，也可以轉(zhuǎn)發(fā)給ClientB。這樣就實(shí)現(xiàn)了Clients之間的通信了。（重點(diǎn)在保存連接信息?。。?br/>

那么現(xiàn)在貼上代碼講解：

Server端代碼 

namespace SocketServer
{
  class Program
  {
    private static byte[] result = new byte[1024];
   
    static Socket serverSocket;
    private static string client;
    private static Socket clientSocket;
    //我這里存了兩個(gè)Client，因?yàn)樽约弘娔X開(kāi)了兩個(gè)Client，不會(huì)有多的
    //理論上應(yīng)該開(kāi)一個(gè)Socket[]來(lái)保存信息，最好用一個(gè)二元組將client的信息和連接綁定起來(lái)
    //這樣就可以實(shí)現(xiàn)斷開(kāi)連接后下次登陸還是可以識(shí)別是這個(gè)Client
    private static Socket clientSocketA=null;
    private static Socket clientSocketB=null;
    
    static void Main(string[] args)
    {
      Program.SetPort(8885);
    }
    private static void SetPort(int port)
    {
      IPAddress ip = IPAddress.Parse("127.0.0.1");//set ip
      serverSocket = new Socket(AddressFamily.InterNetwork,
        SocketType.Stream, ProtocolType.Tcp);//initialize
      serverSocket.Bind(new IPEndPoint(ip, port));//bind
      serverSocket.Listen(10);
      //進(jìn)入監(jiān)聽(tīng)狀態(tài)
      Console.WriteLine("監(jiān)聽(tīng){0}成功", serverSocket.LocalEndPoint.ToString());
      //開(kāi)啟一個(gè)線程來(lái)監(jiān)聽(tīng)客戶端連接
      Thread myThread = new Thread(ListenClientConnect);
      myThread.Start();
      Console.ReadLine();

    }
    /// <summary>
    /// 監(jiān)聽(tīng)客戶端連接
    /// </summary>
    private static void ListenClientConnect()
    {
      while (true)
      {
        //Client連接上后 得到這個(gè)連接
        clientSocket = serverSocket.Accept();

        //這里我因?yàn)橹挥袃蓚€(gè)Client，所以就簡(jiǎn)單寫(xiě)了
        if (clientSocketA == null)
        {
          clientSocketA = clientSocket;
        }
        else if (clientSocketB == null)
        {
          clientSocketB = clientSocket;
        }
        else
        {
          //當(dāng)其中一個(gè)斷開(kāi)了，又重新連接時(shí)，需要再次保存連接
          if (clientSocketB.IsBound)
          {
            clientSocketA = clientSocketB;
            clientSocketB = clientSocket;
          }
          else
          {
            clientSocketB = clientSocketA;
            clientSocketA = clientSocket;
          }
          
        }
        clientSocket.Send(Encoding.ASCII.GetBytes("say hello"));
        //開(kāi)個(gè)線程接收Client信息
        Thread receivedThread = new Thread(ReceiveMessage);
        receivedThread.Start(clientSocket);

      }
    }
   
    private static void ReceiveMessage(object clientSocket)
    {
      Socket myClientSocket = (Socket) clientSocket;
      
      while (true)
      {
        try
        {
          int revceiveNumber = myClientSocket.Receive(result);
          //Console.WriteLine("接受客戶端{(lán)0}消息{1}", myClientSocket.RemoteEndPoint.ToString()
          //  , Encoding.ASCII.GetString(result, 0, revceiveNumber));
          Console.WriteLine(Encoding.ASCII.GetString(result, 0, revceiveNumber));
          if (myClientSocket == clientSocketA)
          {
            Console.WriteLine("receive from A");
            if (clientSocketB!=null&&clientSocketB.IsBound)
            {
              Console.WriteLine("a IS BOUND");
              clientSocketB.Send(result, 0, revceiveNumber, SocketFlags.None);
            }
            else
            {
              myClientSocket.Send(Encoding.ASCII.GetBytes("the people is not online! Send Failed!"));
              Console.WriteLine("對(duì)方不在線上，發(fā)送失??！");
            }
          }
          else
          {
            Console.WriteLine("receive from B");
            if (clientSocketA != null && clientSocketA.IsBound)
            {
              Console.WriteLine("a IS BOUND");
              clientSocketA.Send(result, 0, revceiveNumber, SocketFlags.None);
            }  
            else
            {
              myClientSocket.Send(Encoding.ASCII.GetBytes("the people is not online! Send Failed!"));
              Console.WriteLine("對(duì)方不在線上，發(fā)送失??！");
            }

          }
          
        }
        catch(Exception ex)
        {
          Console.WriteLine(ex.Message);
          myClientSocket.Shutdown(SocketShutdown.Both);
          myClientSocket.Close();
          break;

        }
      }

    }
  }
}

Client端代碼(因?yàn)槎疾畈欢?就只貼一個(gè)了) 

namespace SocketClient
{
  class Program
  {
    private static byte[] result = new byte[1024];
    private static Socket clientSocket;
    private static void ListenServer()
    {
      while (true)
      {
        result = new byte[1024];
        int receiveLength = clientSocket.Receive(result);
        
        Console.WriteLine("{0}", Encoding.ASCII.GetString(result, 0, receiveLength));
      }
      
    }
    static void Main(string[] args)
    {

      IPAddress ip = IPAddress.Parse("127.0.0.1");
      clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
      try
      {
        clientSocket.Connect(ip, 8885);
        Console.WriteLine("連接成功！");

      }
      catch (Exception e)
      {
        Console.WriteLine("連接失??！");
        return;
      }
      Thread threadRead = new Thread(ListenServer);
      threadRead.Start();
     

      while(true)
      {
        try
        {
          Thread.Sleep(1000);
          string sendMessage = Console.ReadLine();
          clientSocket.Send(Encoding.ASCII.GetBytes("Sylvia:"+sendMessage));
          
        }
        catch (Exception ex)
        {
          clientSocket.Shutdown(SocketShutdown.Both);
          clientSocket.Close();
          break;
        }

      }
      Console.WriteLine("發(fā)送完畢 按回車退出");
      Console.ReadKey();
    }
  }
}

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