Apache Commons FTPClient Loggin

Question

我正在使用org.apache.commons.net.ftp.FTPSClient將文件上傳到FTPS服務器（通過TLS/SSL）。

請注意FTP服務器位於Windows服務器上，證書是自簽名證書，可以連接並通過FileZilla成功上傳文件，之後我接受證書無效的警告。

但是，處理相同內容的java代碼不起作用。我已經在代碼中單獨檢查了連接步驟和登錄步驟，並且發現在連接步驟（ftps.connect（服務器，端口））後發生了錯誤 - 在控制檯中打印了「連接到服務器：端口」日誌。我很困惑getRemoteAddress應該在已經完成的連接步驟中處理。

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); 

    } 

完整的日誌在控制檯打印的是：

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/:?] 

非常感謝@ devpuh的答覆，我已成功登錄的用戶名更改\至/後，但仍未能上傳文件，並有失敗的地方沒有詳細的信息，下面是完整的日誌中控制檯：

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

Answer 1

對於原來的問題

您的登錄憑據不正確，但您仍在嘗試上載文件。

您必須處理不正確的登錄。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; 
} 

---

所編輯的問題

要找出爲什麼上傳不工作，你可以從服務器獲取最後的答覆與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很少顯示錯誤或警告消息，因此最好是一個PrintCommandListener添加到調試。

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