Apache Commons FTPClient Loggin

Question

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

请注意FTP服务器位于Windows服务器上，证书是自签名证书，可以连接并通过FileZilla成功上传文件，之后我接受证书无效的警告。

但是，处理相同内容的java代码不起作用。我已经在代码中单独检查了连接步骤和登录步骤，并且发现在连接步骤（ftps.connect（服务器，端口））后发生了错误 - 在控制台中打印了“连接到服务器：端口”日志。我很困惑getRemoteAddress应该在已经完成的连接步骤中处理。

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); 

    } 

完整的日志在控制台打印的是：

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的答复，我已成功登录的用户名更改\至/后，但仍未能上传文件，并有失败的地方没有详细的信息，下面是完整的日志中控制台：

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

Answer 1

对于原来的问题

您的登录凭据不正确，但您仍在尝试上载文件。

您必须处理不正确的登录。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; 
} 

---

所编辑的问题

要找出为什么上传不工作，你可以从服务器获取最后的答复与getReplyString()。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：在FTPClient很少显示错误或警告消息，因此最好是一个PrintCommandListener添加到调试。

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