Annotation Configuration for uploading files to server using Spring Integration FTP adapter - ftp

Question

I'm unable to upload files to a server using annotation based configuration for Spring Integration FTP Adapter. The code that I have used is:
#SuppressWarnings({ "unchecked", "rawtypes" })
#Bean
public IntegrationFlow ftpOut()
{
DefaultFtpSessionFactory defSession=new DefaultFtpSessionFactory();
defSession.setUsername("chh7kor");
defSession.setPassword("Geetansh71!!");
defSession.setPort(21);
defSession.setHost("10.47.116.158");
String remoteDirectory=DefaultFtpSessionFactory.DEFAULT_REMOTE_WORKING_DIRECTORY;
File localDirectory=new File("C:\\FTP_Default");
return IntegrationFlows.from(Ftp.outboundAdapter(defSession, FileExistsMode.REPLACE).remoteDirectory(remoteDirectory)).get();
}
#Bean
public MessageChannel outputChannel()
{
File f=new File(PATH_FOR_FILES_FROM_SERVER);
File[] allSubFiles=f.listFiles();
DirectChannel dC=new DirectChannel();
for(File iterateFiles:allSubFiles)
{
final Message<File> messageFile = MessageBuilder.withPayload(iterateFiles).build();
dC.send(messageFile);
}
return dC;
}
I'm trying to read the files from a local folder and push it into a channel but the IntegrationFlow doesn't allow me to attach a channel to it.Please advise how to achieve the same as this snippet is not helping.

Answer 1

You seem to have completely misunderstood Spring Java configuration. #Bean is for defining beans - you should not be sending messages like you are doing in the for loop - the application context is not ready to accept messages yet, it is only defining beans at this point.
You should also configure the session factory as a #Bean - not declaring it within the integration flow #Bean.
Finally, starting a flow with an outbound adapter makes no sense; you need...
#Bean
public IntegrationFlow ftpOut() {
String remoteDirectory=DefaultFtpSessionFactory.DEFAULT_REMOTE_WORKING_DIRECTORY;
File localDirectory=new File("C:\\FTP_Default");
return IntegrationFlows.from(outputChannel())
.handle(Ftp.outboundAdapter(defSession, FileExistsMode.REPLACE).remoteDirectory(remoteDirectory)))
.get();
}
Then, after you create the context, send messages to the output channel.

Answer 2

A working example for people's reference to the above mentioned question is:
#Bean
public DefaultFtpSessionFactory sessionFactory()
{
DefaultFtpSessionFactory defSession=new DefaultFtpSessionFactory();
defSession.setUsername("chh7kor");
defSession.setPassword("Geetansh71!!");
defSession.setPort(21);
defSession.setHost("10.47.116.158");
return defSession;
}
#Bean
public IntegrationFlow ftpOut()
{
String remoteDirectory=sessionFactory().DEFAULT_REMOTE_WORKING_DIRECTORY;
return IntegrationFlows.from(messageChannel())
.handle(Ftp.outboundAdapter(sessionFactory(), FileExistsMode.REPLACE).remoteDirectory(remoteDirectory+"/F").autoCreateDirectory(true))
.get();
}
public static void main(String args[])
{
File f=new File(PATH_FOR_FILES_FROM_SERVER);
File[] allSubFiles=f.listFiles();
for (File file : allSubFiles) {
if(file.isDirectory())
{
System.out.println(file.getAbsolutePath()+" is directory");
//Steps for directory
}
else
{
System.out.println(file.getAbsolutePath()+" is file");
//steps for files
}
}
PollableChannel pC=ctx.getBean("pollableChannel", PollableChannel.class);
for(File iterateFiles:allSubFiles)
{
final Message<File> messageFile = MessageBuilder.withPayload(iterateFiles).build();
pC.send(messageFile);
Thread.sleep(2000);
}
}