关闭套接字时的SocketException

Question

因此，我有一个客户机wich连续发送和接收数据消息，wich工作正常，然而，当我关闭/停止客户机时，我会得到以下单行错误：

java.net.SocketException: Socket closed

尽管我试图关闭插座--最终封闭了。现在我的问题是为什么我会收到这个错误，这个行为是否正常，以及如何正确处理这个错误。下面是我的代码：

public static void main(String[] args) throws UnknownHostException, IOException {
    
    Socket socket = null;
    
    try {
        socket = new Socket("localhost", 9101);
         
        PrintWriter out = new PrintWriter(socket.getOutputStream());
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        
        Thread thread = new Thread(new Runnable() {

            @Override
            public void run() {

                while(true) {
                    try {
                        System.out.println(in.readLine());
                    } catch (IOException e) {
                        e.printStackTrace();
                        System.out.println("error");
                    }
                }
            }
        });
        thread.start();
        
        System.out.println("Write to server:");
        
        Scanner scanner = new Scanner(System.in);

        while (scanner.hasNextLine()) {
            String message = scanner.nextLine(); 

            out.println(message);
            out.flush();

        };
    } finally {
        socket.close();
    }
}

Answer 1

if(socket.isClosed())
   System.out.println(in.readLine());