How to upload multiple files to FTP

[annuk]

Hi,

I want to upload files to FTP using SI.
There may be more than one file.
Currently i am using this approach:

for(File fileToBeUploaded:filesList)
	{
		Message<File> fileMessage = MessageBuilder.withPayload(fileToBeUploaded).build();
		ftpChannel.send(fileMessage);
	}

This way the FTP channel copies the file to my FTP.
Cant i send a List?
Tried using this:

Message<List<File>> fileMessage = MessageBuilder.withPayload(filesList).build();
ftpChannel.send(fileMessage);

But gave the following error:

org.springframework.integration.MessageDeliveryException: Failed to create sendable file.
	at org.springframework.integration.file.remote.handler.FileTransferringMessageHandler.redeemForStorableFile(FileTransferringMessageHandler.java:195)
	at org.springframework.integration.file.remote.handler.FileTransferringMessageHandler.handleMessageInternal(FileTransferringMessageHandler.java:126)
	at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
	at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:110)
	at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97)
	at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:61)
	at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:157)
	at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:128)
	at com.ftptest.test.FtpTest.main(FtpTest.java:49)
Caused by: java.lang.IllegalArgumentException: Unsupported payload type. The only supported payloads are java.io.File, java.lang.String, and byte[]
	at org.springframework.integration.file.remote.handler.FileTransferringMessageHandler.redeemForStorableFile(FileTransferringMessageHandler.java:189)

Please help.
Thanks in advance.
Regards,
Annuk

[Gary Russell]

Just add a <splitter/> component to the flow

<splitter input-channel="in" outpur-channel="toFTP"/>

By default, a <splitter/> will split a payload of Collection<SomeObject> to a set of messages, each containing a payload of SomeObject. So, a list of files will be split into messages, each containing a File from the List.

[annuk]

Hey Gary,

Tried adding the splitter and it worked.
Thanks for your quick reply.

Regards,
Annuk

[annuk]

Hi,
I am uploading files using SI FTP.
It is a two step process.
1.Upload file using ftp:outbound-channel-adapter
2.Check if the file is uploaded or not using ftp:outbound-gateway command="ls"
This process is a scheduled process.

How do i tell the schedular to start listening to a specific channel?

<task:scheduled-tasks>
<task:scheduled ref="ftpService" method="startFTP"
cron="0 * * * * ?" />
</task:scheduled-tasks>


Thanks in advance.
Regards,
Annuk.

[Mark Fisher]

Why not use the FTP inbound adapter instead of a scheduled task?

Then your cron expression would go into that adapter's poller.