java - FTP 客户端类未连接

Question

FTPClient client = new FTPClient();
FileInputStream fis = null;


try {
    client.connect("32.178.10.121");
    client.login("XXX", "XXX");

    //
    // Create an InputStream of the file to be uploaded
    //
    String filename = "Touch.dat";
    fis = new FileInputStream(filename);

    //
    // Store file to server
    //
    client.storeFile(filename, fis);
    client.logout();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        if (fis != null) {
            fis.close();
        }
        client.disconnect();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

我已经尝试过了，但每次它都会给出超时异常，并且通过其他方式我成功地建立了连接，但从这里开始可能是什么原因。

这是堆栈跟踪:

java.net.ConnectException: Connection timed out: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(Unknown Source)
    at java.net.PlainSocketImpl.connectToAddress(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 java.net.Socket.<init>(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at org.apache.commons.net.DefaultSocketFactory.createSocket(DefaultSocketFactory.java:53)
    at org.apache.commons.net.SocketClient.connect(SocketClient.java:162)
    at org.apache.commons.net.SocketClient.connect(SocketClient.java:250)
    at forTesting.FileUploadDemo.main(FileUploadDemo.java:15)

Answer 1

首先尝试像下面这样设置代理详细信息

FTPClient ftp = new FTPHTTPClient(proxyHost, proxyPort, proxyUser, proxyPassword);

然后尝试连接，如果错误消失，请告诉我。
如果错误仍然存​​在，则检查 FTP 服务器的防火墙设置。还尝试使用一些 GUI 工具(如 Filezilla)从系统连接到服务器。