Error During Ftp Transfer Java.net.unknownhostexception Ftp.apache.org
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for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > Reason for getting UnKnown host exception FTP http://stackoverflow.com/questions/21985467/java-net-unknownhostexception-not-able-to-connect-to-ftp in a java program Want to Advertise Here? Solved Reason for getting UnKnown host exception FTP in a java program Posted on 2011-12-27 Linux Networking 1 Verified Solution 4 Comments 937 Views Last Modified: 2012-05-12 While trying to connect FTP through a java program, we got the below exception. java.net.UnknownHostException: HOSTNAME https://www.experts-exchange.com/questions/27510041/Reason-for-getting-UnKnown-host-exception-FTP-in-a-java-program.html at java.net.PlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.
FTPClient java.lang.Object org.apache.commons.net.SocketClient org.apache.commons.net.ftp.FTP org.apache.commons.net.ftp.FTPClient All Implemented Interfaces: Configurable Direct Known Subclasses: FTPHTTPClient, FTPSClient public class FTPClient extends FTP implements Configurable FTPClient encapsulates all the functionality necessary to store and retrieve https://commons.apache.org/net/apidocs/org/apache/commons/net/ftp/FTPClient.html files from an FTP server. This class takes care of all low level https://www.daniweb.com/programming/software-development/threads/331804/connect-to-ftp-using-java details of interacting with an FTP server and provides a convenient higher level interface. As with all classes derived from SocketClient, you must first connect to the server with connect before doing anything, and finally disconnect after you're completely finished interacting with the server. Then you need to check the FTP error during reply code to see if the connection was successful. For example: FTPClient ftp = new FTPClient(); FTPClientConfig config = new FTPClientConfig(); config.setXXX(YYY); // change required options // for example config.setServerTimeZoneId("Pacific/Pitcairn") ftp.configure(config ); boolean error = false; try { int reply; String server = "ftp.example.com"; ftp.connect(server); System.out.println("Connected to " + server + "."); System.out.print(ftp.getReplyString()); // After connection attempt, you should check the reply code to error during ftp verify // success. reply = ftp.getReplyCode(); if(!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); System.err.println("FTP server refused connection."); System.exit(1); } ... // transfer files ftp.logout(); } catch(IOException e) { error = true; e.printStackTrace(); } finally { if(ftp.isConnected()) { try { ftp.disconnect(); } catch(IOException ioe) { // do nothing } } System.exit(error ? 1 : 0); } Immediately after connecting is the only real time you need to check the reply code (because connect is of type void). The convention for all the FTP command methods in FTPClient is such that they either return a boolean value or some other value. The boolean methods return true on a successful completion reply from the FTP server and false on a reply resulting in an error condition or failure. The methods returning a value other than boolean return a value containing the higher level data produced by the FTP command, or null if a reply resulted in an error condition or failure. If you want to access the exact FTP reply code causing a success or failure, you must call getReplyCode after a success or failure. The default settings for FTPClient are for it to use FTP.ASCII_FILE_TYPE , FTP.NON_
and get the names of the files... But am getting an UnknownHostException when i gave the ip.. Following is my code import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.io.FileUtils; import java.io.IOException; public class FtpTest { public static void main(String[] args) { try{ FTPClient client = new FTPClient(); client.connect("ftp.111.111.111.111"); client.disconnect(); } catch(Exception e){ e.printStackTrace(); } } } My IP is different than what i mentioned above.. Am getting the following error... java.net.UnknownHostException: ftp.111.111.111.111 at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:525) at java.net.Socket.connect(Socket.java:475) at java.net.Socket.