Apache FTPClient在retrieveFileStream期间挂起

Question

Dear all I have a problem with my code. My ftp client is sometimes hanging when it is retrieving a file with "ftpClient.retrieveFileStream()". Any idea what I can do? I am using apache commons FTP client v3.4.

• I tried also with "ftpClient.retrieveFile()" but it did not make any difference.
• setting the connection and scoket timeout did not help
• setting the passive mode did not help

• increasing the buffer did not help

    ftpClient = new FTPClient(); ftpClient.setBufferSize(1024 * 1024); ftpClient.setConnectTimeout(10000); ftpClient.connect(serverAddress); ftpClient.login(userName,password); ftpClient.setFileType(FTP.BINARY_FILE_TYPE); ftpClient.enterLocalPassiveMode(); ftpClient.setSoTimeout(10000); log("retriving file " + remoteFilePath + "..."); OutputStream output = new FileOutputStream(localFilePath); InputStream inputStream = ftpClient.retrieveFileStream(remoteFilePath); // here it is sometimes hanging. try { IOUtils.copy(inputStream, output); output.flush(); } finally { IOUtils.closeQuietly(output); IOUtils.closeQuietly(inputStream); ftpClient.completePendingCommand(); } 

the last message I retrieve are looking usually like this:

19:58:21.145 [main] INFO  FTPDAO: retrieving file /Modell/5250/Artikel/25777/lg_keh68bgh_1.jpg...
19:58:21.145 [main] INFO  Log4JFTPCommandListener - >> PASV
19:58:21.462 [main] INFO  Log4JFTPCommandListener - << 227 Entering Passive Mode (195,216,65,165,168,240)
19:58:21.476 [main] INFO  Log4JFTPCommandListener - >> RETR /Modell/5250/Artikel /25777/lg_keh68bgh_1.jpg
19:58:21.490 [main] INFO  Log4JFTPCommandListener - << 150 Connection accepted

When I suspend the programm with the debugger, then it looks that is hanging at

 java.net.SocketInputStream.socketRead0(FileDescriptor, byte[], int, int, int) 
 java.net.SocketInputStream.socketRead(FileDescriptor, byte[], int, int, int) line: 116 
 java.net.SocketInputStream.read(byte[], int, int, int) line: 170   
 java.net.SocketInputStream.read(byte[], int, int) line: 141    

regards Mark

Answer 1

I had this problem too. I changed retrieveFileStream to retrieveFile . and it doesn't hang there anymore.