Question

我有一个Java电子表格应用程序，它提供的功能之一（我开发的）是工作表共享。基本上，任何人都可以是客户端或服务器，因为该应用程序同时具有服务器和客户端代码。作为服务器的用户创建共享，指定IP，然后创建并激活共享（最佳情况场景），服务器在其IP和选定端口上侦听客户端。

对于自动发现，我通过UDP广播使用DatagramSockets，而'真实通信'是基于TCP的（在客户端已经连接之后）。

我已经有了这个代码来从服务器向客户端发送活动共享列表（它发送List InetSocketAddress）。

服务器：

public class BroadcastList implements Runnable {
        private final int BROADCAST_PORT = 8888;

        public BroadcastList() {
        }

        @Override
        public void run() {
            try {
                ActiveShareList asl = new ActiveShareList();
                List<InetSocketAddress> shareList = asl.getActiveShareList();
                DatagramSocket broadcast = new DatagramSocket(BROADCAST_PORT);
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                ObjectOutputStream outputStream = new ObjectOutputStream(out);
                outputStream.writeObject(shareList);
                outputStream.close();

                byte[] listData = out.toByteArray();
                byte[] message = new byte[10];

                DatagramPacket listPacket = new DatagramPacket(listData, listData.length);
                DatagramPacket messagePacket = new DatagramPacket(message, message.length);

                broadcast.receive(messagePacket);
                broadcast.send(listPacket);

            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

客户：

public void getShareList() {
        DatagramSocket socket;
        try {
            InetSocketAddress address = new InetSocketAddress("255.255.255.255", 8888);
            socket = new DatagramSocket();

            byte[] buffer = new byte[10];
            List<InetSocketAddress> shareList = new ArrayList<InetSocketAddress>();
            byte[] listData = new byte[65535];
            DatagramPacket messagePacket = new DatagramPacket(buffer, buffer.length, address.getAddress(), address.getPort());
            DatagramPacket listPacket = new DatagramPacket(listData, listData.length);

            socket.send(messagePacket);
            socket.receive(listPacket);
            ObjectInputStream inputStream = new ObjectInputStream(new ByteArrayInputStream(listData));

            try {
                shareList = (List<InetSocketAddress>) inputStream.readObject();
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(JoinShareAction.class.getName()).log(Level.SEVERE, null, ex);
            }

}

问题出在客户端，它在这一行上给出了java.io.IOException: Can't assign requested address错误：socket.send(messagePacket);。

任何人都知道这是什么问题？

java.io.IOException：无法使用DatagramSockets分配请求的地址

0 个答案: