套接字问题 - readline无法正常工作 [英] Socket problem - readline won't work properly

问题描述

我尝试使用套接字编写客户端和服务器连接。问题是我的客户端无法从服务器读取响应（它挂在readline上）。

I try to code a client and server connection using socket. The problem is my client can't read the response from the server (it hangs on the readline).

以下是一些代码。

    try {
        // Create the server socket.
        portNumber = Integer.parseInt(myParam.get("socket.portNumber"));
        System.out.println(portNumber);
        mainSocket = new ServerSocket(portNumber);

    } catch (IOException ioe) {
        System.out.println("Error Message : "+ioe.getMessage());
    }

    while(true)
    {     
        try
        {
            // Accept connections
            Socket clientSocket = mainSocket.accept();
            SocketServerThread st = new SocketServerThread (clientSocket);
            st.start();
        }
        catch(IOException ioe)
        {
            System.out.println("Error message :"+ioe.getMessage());
        }
    }

线程：

The Thread:

public void run() {

    BufferedReader in = null;
    PrintWriter out = null;
    String clientResponse = null;

    try {
        in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        out = new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream()));

        //Read The Message
        String clientRequest = in.readLine();
        System.out.println("Message recieved : " + clientRequest);

        //Process the message

        // Send response
        out.println(clientResponse+"\n");
        out.flush();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // Clean up
        try {
            in.close();
            out.close();
            clientSocket.close();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }

客户：

The client:

    try {
        // Create the server socket.
        simSocket = new Socket("192.168.52.27", portNumber);
    } catch (IOException ioe) {
        System.out.println("Error Message : " + ioe.getMessage());
    }
    BufferedReader in = null;
    PrintWriter out = null;
    try {
        in = new BufferedReader(new InputStreamReader(simSocket.getInputStream()));
        out = new PrintWriter(new OutputStreamWriter(simSocket.getOutputStream()));

            out.write("My message");
            out.flush();

            do{
            response = in.readLine(); //This is where the code hang
            }while (response.length()<= 0);

            System.out.print(response);

    } catch (IOException ioe) {
        System.out.println("Error message :" + ioe.getMessage());
    } finally {
        try {
            in.close();
            out.close();
            simSocket.close();
        } catch (IOException ioException) {
            ioException.printStackTrace();
        }
    }

你能告诉我这是什么问题吗？非常感谢你的帮助

Could you guys tell me what's the problem? Thank you very much for any help

推荐答案

好的，我已经把这个问题搞定了。它不是挂起的客户端，而是服务器。它尝试从客户端读取一行文本，但客户端不发送行分隔符：

Okay, I've figured this one out. It's not the client that hangs, it's the server. It tries to read a line of text from the client, but the client doesn't send the line separator:

    out.write("My message");
    out.flush();

在这里用println（）替换write（）。

Replace write() with println() here.

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