Java套接字通信“死锁”

Question

嗨，我正在尝试实现服务器与多个客户端一起工作问题是服务器未从inputstream接收消息，一直等到它发生为止。 如果客户端在写入流后没有关闭流，则服务器将继续等待。 客户端发送消息后，他尝试从输入流中读取以等待响应，但是服务器正在等待请求。 所以..僵局

这是我的客户班

public class Client implements Runnable{

...

@Override
public void run() {

    BufferedReader is = null;
    BufferedWriter os = null;

    try(Socket socket = new Socket(address.getHostName(), address.getPort());){

        String request = String.format("%s-%d-%s",this.destination, this.desiredPlace, this.paymentMethod.toString());
        os = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
        is = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        PrintWriter pw = new PrintWriter(os, true);
        pw.write(request);
        pw.flush();
// if I close the stream here the request will be send, but this will close the socket so the I will not receive response.

        String response;
        while ((response = is.readLine()) != null){
            System.out.println(response);
        }

    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

}

这是我的服务器类

 public void perform() throws IOException, DestionationProcessingException, InterruptedException {
    try (ServerSocket server = new ServerSocket(port);) {
        StandalonePayDesk offLinePayDesk = new StandalonePayDesk(ticketManager);
        this.threadPool.submit(offLinePayDesk);

        while (true) {
            Socket socket = server.accept();
            RequestHandler handler = new RequestHandler(this.threadPool, offLinePayDesk, this.ticketManager);
            handler.process(socket);
        }
    }
}

和RequestHandler类，用于处理每个客户端

try (BufferedReader reader = new BufferedReader(new InputStreamReader(client.getInputStream()));
            PrintWriter writer = new PrintWriter(client.getOutputStream(), true)) {

        writer.println("hello");
        writer.flush();

        String line;
        while ((line = reader.readLine()) != null) {

            String[] lineTokens = line.split("-");
              ...

谁能帮我解决这个问题？

Answer 1

pw.write(request);

您的客户正在写一个请求，而不是一行。 您的服务器正在使用readLine()读取一行，并且将阻塞直到行终止符到达为止（这永远不会发生），因此它将永远不会发送答复，因此您的客户端将永远不会收到它，因此它将永远阻塞。

将以上更改为：

pw.println(request);