我正在制作一个分为两部分的程序。

第 1 部分:在 PC 上运行的 C# 服务器套接字应用程序，监听命令并执行相应操作。

第 2 部分:在手机上运行的 Java 客户端套接字应用程序，它会在按下按钮时向 pc 发送命令。

目前，我可以从客户端向服务器发送命令，一切正常。 但我的问题是:当我向服务器发送特定命令时，我希望服务器回复客户端，而客户端读取该回复。

只是，当客户端尝试读取时，它会超时。

Java 客户端程序:

class ClientThread implements Runnable 
{   
    public void run() 
    {
        try 
        {
            Socket socket = new Socket(serverIpAddress, serverPort);
            socket.setSoTimeout(5000);

            while (true) 
            {
                try 
                {
                    PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
                    Log.d("Nicklas", "Out it goes");
                    out.println(Command);

                    if (Command == "CMD:GetOptions<EOF>")
                    {
                        Log.d("Nicklas", "Getting options");
                        try
                        {
                            Log.d("Nicklas", "Line 1");
                            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                            Log.d("Nicklas", "Line 2");
                            String answer = in.readLine();
                            Log.d("Nicklas", "answer = " + answer );
                        }
                        catch (Exception ee)
                        {
                            Log.d("Nicklasasasas", ee.toString());
                        }
                    }
                    break;

                } 

                catch (Exception e) 
                {
                    Log.d("Nicklas", "CAE = " + e.toString());
                    break;

                } 
            }
            socket.close();
        } 
        catch (ConnectException ee)
        {
            Log.d("Nicklas", "Kunne ikke forbinde");

        }
        catch (Exception e) 
        {
            Log.d("Nicklasssssss", e.toString());
        }
    }
}

这被称为:

Thread cThread = new Thread(new ClientThread());
        cThread.start();

并使用全局变量“Command”，它将包含不同的信息，具体取决于按下的按钮。

程序在“String answer = in.readline();”行失败除了“java.net.SocketTimeoutException”。

这是程序的 C# 服务器部分:

private void ListenForClients()
    {
        this.tcpListener.Start();

        while (true)
        {
            //blocks until a client has connected to the server
            TcpClient client = this.tcpListener.AcceptTcpClient();

            //create a thread to handle communication
            //with connected client
            Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
            clientThread.Start(client);
        }
    }

    private void HandleClientComm(object client)
    {
        TcpClient tcpClient = (TcpClient)client;
        NetworkStream clientStream = tcpClient.GetStream();

        byte[] message = new byte[4096];
        int bytesRead;

        while (true)
        {
            bytesRead = 0;

            try
            {
                //blocks until a client sends a message
                bytesRead = clientStream.Read(message, 0, 4096);
            }
            catch
            {
                //a socket error has occured
                break;
            }

            if (bytesRead == 0)
            {
                //the client has disconnected from the server
                break;
            }

            //message has successfully been received
            ASCIIEncoding encoder = new ASCIIEncoding();
            //System.Diagnostics.Debug.WriteLine(encoder.GetString(message, 0, bytesRead));
            string Input = (encoder.GetString(message, 0, bytesRead));
            Input = Input.Trim();
            object[] obj = new object[1];
            obj[0] = Input;
            if (Input == "CMD:GetOptions<EOF>")
            {
                try
                {
                    byte[] buffer = encoder.GetBytes("CMD:Accepted");
                    clientStream.Write(buffer, 0, buffer.Length);
                    clientStream.Flush();
                    MessageBox.Show("Client program asked for reply");
                }
                catch (Exception e)
                {
                    MessageBox.Show("Oh it no work!: " + e.ToString());
                }
            }
            else
            {
                Udfor(Input);
            }


        }

        tcpClient.Close();
    }

在 Form1() 中调用以下内容

this.tcpListener = new TcpListener(IPAddress.Any, 4532);
this.listenThread = new Thread(new ThreadStart(ListenForClients));
this.listenThread.Start();

C# 服务器似乎工作正常，并显示消息框“客户端程序要求回复”

谁能发现错误？

最佳答案

我想通了! 问题是 C#。当服务器发回命令“CMD:Accepted”时，它从未关闭套接字，因此 android 应用程序不知道它是否已完成读取!冲洗后立即关闭套接字 + 当然，如果我已经关闭了，就不再关闭它，成功了!

关于c# - 套接字 - Java 客户端，C# 服务器，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11154367/