Question

我正在尝试实现一个简单的客户端服务器程序，该程序将持续交换消息，直到客户端决定停止。我找到了很多关于这个主题的教程，但是我正在努力正确地实现循环。服务器处理第一个请求但不处理其他请求。

这可能是一些愚蠢的错误，所以请原谅我提出这样一个基本问题 - 我是套接字的新手。我很乐意提供任何帮助。我提供了所有代码（基于我发现的一些示例）：

客户端：

public class Client {
    public static void main(String argv[]) throws Exception {

        talkWithServer();
    }

    private static void talkWithServer() throws UnknownHostException, IOException {
        String sentence;
        String serverResponse;
        BufferedReader brClient = new BufferedReader(new InputStreamReader(System.in));

        Socket clientSocket = new Socket("localhost", 9000);
        DataOutputStream out = new DataOutputStream(clientSocket.getOutputStream());
        BufferedReader brServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

        while(true) {
            sentence = brClient.readLine();
            out.writeBytes(sentence + '\n');
            serverResponse = brServer.readLine();
            System.out.println(serverResponse);

            if (serverResponse.contains("<BYE>")) {
                break;
            }
        }

        clientSocket.close();
    }
}

服务器：

public class Server {
    public static void main(String args[]) throws Exception {
        String clientSentence;
        ServerSocket welcomeSocket = new ServerSocket(9000);

        Protocol protocol = new Protocol();

        while (true) {
            Socket connectionSocket = welcomeSocket.accept();
            BufferedReader inFromClient = new BufferedReader(
                    new InputStreamReader(connectionSocket.getInputStream()));
            DataOutputStream outToClient = new DataOutputStream(
                    connectionSocket.getOutputStream());

            clientSentence = inFromClient.readLine();

            String response = protocol.processInput(clientSentence);

            outToClient.writeBytes(response + '\n');
        }
    }
}

协议：

public class Protocol {

    public String processInput(String theInput) {
        String theOutput = "> " + theInput;


        return theOutput;
    }
}

为简化调试，我简化了示例。感谢您的任何提示！

Answer 1

我的猜测是“Socket connectionSocket = welcomeSocket.accept（）;” 如果我没记错的话，这将尝试每次接受新的客户端，并且由于你只连接一个，它将在第二次迭代中永远等待该行。我建议你在while循环之前粘贴该行。

Answer 2

尝试以下

Socket connectionSocket = welcomeSocket.accept();
while (true) {

        BufferedReader inFromClient = new BufferedReader(
                new InputStreamReader(connectionSocket.getInputStream()));
        DataOutputStream outToClient = new DataOutputStream(
                connectionSocket.getOutputStream());

        clientSentence = inFromClient.readLine();
        String response = protocol.processInput(clientSentence);

        outToClient.writeBytes(response + '\n');
        outToClient.flush();

    }

带有循环消息传递的简单客户端

2 个答案: