Apache Commons Net - Retrieve File - Extension, Compare , Move - FTP Server

Dear All,
I am using Apache Commons net FTP Library for FTP Operations. I had a few doubts
1) I like to retrieve ftp files only with some extensions like *.txt or *.jpg etc. How can we retrieve files with specifying file extension?
2) I need to compare the FTP Files with the local files before downloading from the FTP Server?
3) I need to move files from the ftp server to local directory. Is there is anyway to move the files rather than first retrieve files from the FTP Server and then deleting the file in the FTP Server using FTP delete()
Thanks,
J.Kathiresan

1) I like to retrieve ftp files only with some
extensions like *.txt or *.jpg etc. How can we
retrieve files with specifying file extension?
List the files and then filter the list to those that you want to process.
2) I need to compare the FTP Files with the local
files before downloading from the FTP Server?Think about this one! To compare two files you nead to read both. If you do this on the client then you will have to copy the file from the server first!
>
3) I need to move files from the ftp server to local
directory. Is there is anyway to move the files
rather than first retrieve files from the FTP Server
and then deleting the file in the FTP Server using
FTP delete()What is wrong with copy then delete?

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import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
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at MyTest.main(MyTest.java:23)
loging out
java.lang.NullPointerException
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at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:583<ftp://FTP.java:583>)
at org.apache.commons.net.ftp.FTP.quit(FTP.java:794<ftp://FTP.java:794>)
at org.apache.commons.net.ftp.FTPClient.logout(FTPClient.java:697)
at MyTest.main(MyTest.java:39)
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import it.sauronsoftware.ftp4j.connectors.SOCKS4Connector;
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e.printStackTrace();
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try {
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ftpClient.disconnect(true);
catch (Exception e) {
e.printStackTrace();
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Hello everybody!
I�m starting to use commons net library in a java project, and I have this doubt: I need to list files in a ftp server, for instance, like this �action*/slot*-qual*.txt�
i.e., I want to list all the files like �slot (something) � qual (something) .txt�, in all directories beginning with �action (something)�.
When I put this path in a variable named �path� and pass it to the listFiles method, it returns me a list of zero files. But, for instance, if I only pass the path �action*�, the listFiles returns me all the directories beginning with �action�, like action01, action02, etc. The same happens if I pass only �slot*-qual*.txt�, giving me all the files that respect the command, within a certain directory, like slot1-qual101010.txt, slot2-qual10.txt, slot3-qual1.txt, etc.
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Apache Commons Net - Retrieve File - Extension, Compare , Move - FTP Server

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