java - "Network is unreachable"在可穿戴设备上使用 FTP 主动模式时

Question

我目前正在尝试开发一款可穿戴应用程序，它可以通过 FTP 将带有加速度计和陀螺仪数据的文件上传到我的 PC。

我使用以下代码在我的 PC 上的 Eclipse 中运行一个 FTP 服务器:

public static void main(String[] args) throws FtpException {

    ListenerFactory listenerFactory = new ListenerFactory();
    listenerFactory.setPort(2221);

    PropertiesUserManagerFactory userManagerFactory = new PropertiesUserManagerFactory();
    UserManager userManager = userManagerFactory.createUserManager();
    BaseUser user = new BaseUser();
    user.setName("Anonymous");
    user.setPassword("");
    user.setHomeDirectory("C:\\temp");  

    List<Authority> authorities = new ArrayList<Authority>();
    authorities.add(new WritePermission());
    user.setAuthorities(authorities);
    userManager.save(user);

    FtpServerFactory factory = new FtpServerFactory();
    factory.setUserManager(userManager);
    factory.addListener("default", listenerFactory.createListener());

    FtpServer server = factory.createServer();
    server.start();
}

我正在使用这种方法连接到 FTP 服务器:

public void connectToFTPServer() throws IOException {
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

    StrictMode.setThreadPolicy(policy);
    Log.i("CONNECT FTP SERVER", "Connecting to FTP Server");
    ftpClient.connect(server, port);
    ftpClient.login(user, pass);
    ftpClient.enterLocalActiveMode();
    ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
}

以及上传传感器数据的方法:

public void uploadFileTest()throws IOException {
    try
    {
        if (ftpClient.login("Anonymous", ""))
        {
            String data = this.getFilesDir() + "/" + "SensorData.txt";

            FileInputStream in = new FileInputStream(new File(data));
            boolean result = ftpClient.storeFile("SensorData.txt", in);
            in.close();
            if (result) Log.v("upload result", "succeeded");
            ftpClient.logout();
            ftpClient.disconnect();
        }
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

可穿戴设备正在 Android Studio 的模拟器上运行，即使看起来已建立 FTP 服务器连接，但当我尝试上传传感器数据时，我在 FTP 服务器上遇到以下错误消息。

[main] INFO org.apache.ftpserver.impl.DefaultFtpServer - FTP server started
[NioProcessor-3] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CREATED
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - OPENED
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 220 Service ready for new user.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: USER Anonymous
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 331 User name okay, need password for Anonymous.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: PASS *****
[pool-3-thread-1] INFO org.apache.ftpserver.command.impl.PASS - Login success - Anonymous
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 230 User logged in, proceed.

[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: TYPE I
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 200 Command TYPE okay.

[NioProcessor-4] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CREATED
[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - OPENED
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 220 Service ready for new user.

[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: USER Anonymous
[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 331 User name okay, need password for Anonymous.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: PASS *****
[pool-3-thread-1] INFO org.apache.ftpserver.command.impl.PASS - Login success - Anonymous
[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 230 User logged in, proceed.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: TYPE I
[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 200 Command TYPE okay.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: PORT 10,0,2,15,157,216
[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 200 Command PORT okay.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - RECEIVED: STOR SensorData.txt
[pool-3-thread-1] WARN org.apache.ftpserver.impl.IODataConnectionFactory - FtpDataConnection.getDataSocket()
java.net.SocketException: Network is unreachable: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at org.apache.ftpserver.impl.IODataConnectionFactory.createDataSocket(IODataConnectionFactory.java:312)
    at org.apache.ftpserver.impl.IODataConnectionFactory.openConnection(IODataConnectionFactory.java:258)
    at org.apache.ftpserver.command.impl.STOR.execute(STOR.java:133)
    at org.apache.ftpserver.impl.DefaultFtpHandler.messageReceived(DefaultFtpHandler.java:211)
    at org.apache.ftpserver.listener.nio.FtpHandlerAdapter.messageReceived(FtpHandlerAdapter.java:62)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:858)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:542)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:48)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:947)
    at org.apache.ftpserver.listener.nio.FtpLoggingFilter.messageReceived(FtpLoggingFilter.java:85)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:542)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:48)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:947)
    at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:74)
    at org.apache.mina.filter.logging.MdcInjectionFilter.filter(MdcInjectionFilter.java:135)
    at org.apache.mina.filter.util.CommonEventFilter.messageReceived(CommonEventFilter.java:70)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:542)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:48)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:947)
    at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:398)
    at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:234)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:542)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:48)
    at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:947)
    at org.apache.mina.core.filterchain.IoFilterEvent.fire(IoFilterEvent.java:74)
    at org.apache.mina.core.session.IoEvent.run(IoEvent.java:63)
    at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTask(OrderedThreadPoolExecutor.java:770)
    at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.runTasks(OrderedThreadPoolExecutor.java:762)
    at org.apache.mina.filter.executor.OrderedThreadPoolExecutor$Worker.run(OrderedThreadPoolExecutor.java:704)
    at java.lang.Thread.run(Unknown Source)
[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 150 File status okay; about to open data connection.

[pool-3-thread-1] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - SENT: 425 Can't open data connection.

[pool-3-thread-2] INFO org.apache.ftpserver.listener.nio.FtpLoggingFilter - CLOSED

请指导我，我已经寻找了几个小时的可能解决方案。我已经允许 Windows 防火墙中的端口并尝试了不同的其他方法。

谢谢大家

Answer 1

主动模式在移动/可穿戴设备上工作的可能性几乎为零。主动模式下的 FTP 需要启用到设备的传入连接，这反过来需要在客户端(或客户端网络)配置防火墙和 NAT。通常，移动设备上的应用程序位于许多此类防火墙和 NAT 之后(都在设备本身上，但主要在运营商网络内)。您无法(或几乎无法)控制这些。

改用被动模式。

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有关详细信息，请阅读我在 network configuration needed for FTP active and passive modes 上的文章.

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我知道您评论过，被动模式也不适合您。但这不是尝试 Activity 模式的理由。您应该尝试修复被动模式(这是一种更有可能工作的方式)，而不是浪费时间尝试修复主动模式。因此，请考虑发布一个关于被动模式的新问题，以及具体的错误消息和您拥有的任何其他调试信息。