Question

我有一个托管HTTP服务器的Android设备并且是NATed（在路由器后面）。我想从没有NAT的公共服务器访问它。我在一个线程中的端口8080上运行Android设备上的HTTP服务器，一段时间后，我启动了一个客户端线程，尝试从android上的本地端口号8080连接到远程公共服务器。出于某种原因，我在端口8080上启动服务器后，android客户端将无法连接。它也不会产生任何异常。这是我的代码：

Thread server = new Thread(new Runnable() {
public void run() {
    super.run();

    try {
        ServerSocket serverSocket = new ServerSocket();
        serverSocket.setReuseAddress(true);
        serverSocket.bind(new InetSocketAddress("192.168.1.102", 8080));

        while(isRunning){
            try {
                System.out.println("Listening for new connection");
                Socket socket = serverSocket.accept();
                System.out.println("incoming connection accepted");
                new Thread(new ConnectionHandler(socket)).start();    
            } catch (IOException e) {
                e.printStackTrace();
            }                             
        }
        serverSocket.close();
    } 
    catch (IOException e) {
        e.printStackTrace();
    }
}
});
server.start();



// sleep several seconds before launch of client
Thread.currentThread().sleep(5 * 1000);


Thread client = new Thread(new Runnable() {
public void run() {
    super.run();
    try {
        /* .. */
        Inet4Address localaddr = (Inet4Address) InetAddress
                .getByName("192.168.1.102");
        // Inet4Address remoteaddr = (Inet4Address)
        // InetAddress.getByName("122.176.73.10");
        System.out.println("connecting to 122.176.73.10");

        Socket socket = new Socket();

        socket.setReuseAddress(true);
        System.out.println("[Client]socket.isBound():" + socket.isBound());
        socket.bind(new InetSocketAddress("192.168.1.102", 8080));

        for (int i = 1; i < 5; i++) {
            try {
                socket.connect(new InetSocketAddress("122.176.73.10", 4040));
                System.out.println("connected to 122.176.73.10");
                break;
            } catch (Exception e) {
                System.out.println("[Client]fail to connect ");
                Thread.currentThread().sleep(i * 2 * 1000);
            }
        }
    }
}
});
client.start();

Answer 1

端口号不能用于侦听传入连接和进行传出连接。您8080上的侦听套接字会阻止使用该端口的任何其他内容。

TCP打孔，不能在android上重用地址

1 个答案: