Apache Commons FTPClient 登录

Question

我正在使用 org.apache.commons.net.ftp.FTPSClient 将文件上传到 FTPS 服务器（超过 TLS/SSL）。

注意FTP服务器位于Windows服务器上，证书是自签的，在我接受了警告后可以通过FileZilla连接成功上传文件证书无效。

但是 java 处理相同内容的代码不起作用。我在代码中分别检查了连接步骤和登录步骤，发现错误发生在连接步骤 (ftps.connect(server,port)) 之后 - 日志 "Connected to server:port" 已打印在控制台中。我很困惑应该在已经完成的连接步骤中处理 getRemoteAddress。

String ftpsServer = "host";
    int ftpsPort = 21;
    String ftpsUser = "domain\username";
    String ftpsPass = "password";

    try{
        FTPSClient ftpClient = new FTPSClient();
        ftpClient.connect(ftpsServer,ftpsPort);
        // check FTP connection
        int reply = ftpClient.getReplyCode();
        if (!FTPReply.isPositiveCompletion(reply)){
            ftpClient.disconnect();
            System.err.println("FTP server refused connection.");
            System.exit(1);
            } else {
                System.out.println("Connected to " + ftpsServer + ":" + ftpsPort + ".");
            }
        // check FTP login
        if (ftpClient.login(ftpsUser, ftpsPass)){
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
            System.out.println("Logged into FTP server successfully");
        } else {
            System.out.println("Failed log into FTP server");
            ftpClient.logout();
            ftpClient.disconnect();
        }

        File localFile = new File("C:/test/history.txt");
        InputStream inputStream = new FileInputStream(localFile);
        boolean uploaded = ftpClient.storeFile("/wwwroot/preview/history.txt", inputStream);
        System.out.println("uploaded successful? " + uploaded);

        inputStream.close();
        ftpClient.logout();
        ftpClient.disconnect();

    }catch(Exception e){
        LOG.error("Exception when merging Reminderlist is: ", e);

    }

控制台打印的完整日志是：

Connected to 10.20.254.xx:21.
Failed log into FTP server
ERROR 2017-10-13 15:27:15,322 [main] 
com.redwood.contentmanagement.UnzipFiles: Exception when merging 
Reminderlist is: 
java.lang.NullPointerException
at 
org.apache.commons.net.SocketClient.getRemoteAddress(SocketClient.java:553) ~[commons-net-2.2.jar:2.2]
at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:509) ~[commons-net-2.2.jar:2.2]
at org.apache.commons.net.ftp.FTPClient.__storeFile(FTPClient.java:425) ~[commons-net-2.2.jar:2.2]
at org.apache.commons.net.ftp.FTPClient.storeFile(FTPClient.java:1548) ~[commons-net-2.2.jar:2.2]
at com.redwood.contentmanagement.TransferOverFTPS.myTransform(TransferOverFTPS.java:55) ~[classes/:?]
at com.redwood.contentmanagement.TransferOverFTPS.main(TransferOverFTPS.java:110) ~[classes/:?]

非常感谢@devpuh的回复，我在用户名中将\改为/后登录成功，但是上传文件还是失败，也没有详细说明失败的地方，下面是完整的登录控制台：

Connected to 10.20.254.10:21.
Logged into FTP server successfully
uploaded successful? false

Answer 1

对于原题

您的登录凭据不正确，但您仍在尝试上传文件。

您必须妥善处理错误登录。例如：

// check FTP login
if (ftpClient.login(ftpsUser, ftpsPass)){
    ftpClient.enterLocalPassiveMode();
    ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
    System.out.println("Logged into FTP server successfully");
} else {
    System.out.println("Failed log into FTP server");
    ftpClient.logout();
    ftpClient.disconnect();
    return;
}

对于已编辑的问题

要找出上传失败的原因，您可以使用 getReplyString() 获得服务器的最后回复。例如：

boolean uploaded = ftpClient.storeFile("/wwwroot/preview/history.txt", inputStream);
if(!uploaded) {
    System.err.println("Can't upload File! Reply from Server: " + ftpClient.getReplyString());
} else {
    System.out.println("Upload successful");
}

PS: FTPClient 很少显示错误或警告消息，因此最好添加一个PrintCommandListener 进行调试。

ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out), true));

Apache Commons FTPClient 登录

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