如何使用Java Config将提供文件名的文件从一个文件夹移动到远程sftp服务器上的另一个文件夹？

Question

I am stuck with the problem. I have a folder om my sftp server with a file in it: folder/file.txt . What i'm trying to do is simply to move this file to another directory : folder/subfolder/file.txt . In documentation it was written that you simply need to use OutboundGateway with the MV command. That's ok but the main problem is that i don`t know exactly what would be the name of the file, so i need to provide this name dynamically. How can i do that?

@Bean
@InboundChannelAdapter(value = "toSftpChannel",
        poller = @Poller(fixedDelay = "60000", maxMessagesPerPoll = "-1"))
public MessageSource<File> sftpMessageSource() {
    SftpInboundFileSynchronizingMessageSource source =
            new SftpInboundFileSynchronizingMessageSource(sftpInboundFileSynchronizer());
    source.setLocalDirectory(new File(localDirectory));
    source.setAutoCreateLocalDirectory(true);
    source.setLocalFilter(new AcceptOnceFileListFilter<File>());
    return source;
}

@Bean
public SftpInboundFileSynchronizer sftpInboundFileSynchronizer() {
    SftpInboundFileSynchronizer fileSynchronizer = new SftpInboundFileSynchronizer(getSftpSessionFactory());
    fileSynchronizer.setDeleteRemoteFiles(false);
    fileSynchronizer.setRemoteDirectory("/folder");
    fileSynchronizer.setFilter(new FtpSimplePatternFileListFilter("*.txt"));
    return fileSynchronizer;
}

@Bean
@ServiceActivator(inputChannel = "toSftpChannel")
public SftpOutboundGateway moveFileHandler() {
     SftpOutboundGateway sftpOutboundGateway = new SftpOutboundGateway(getSftpSessionFactory(), "mv", "'folder/" + "file.txt" + "'");                                                  
        sftpOutboundGateway.setRenameExpression(new LiteralExpression("/folder/subfolder/" + "file.txt"));
        return sftpOutboundGateway;
    }

Answer 1

Instead of using literal expressions, use a dynamic expression.

eg instead of

"'folder/" + "file.txt" + "'"

use

"'folder/' + headers['file_relativePath']"

and

sftpOutboundGateway.setRenameExpression(parser.parseExpression("'/folder/subfolder/' + headers['file_relativePath']";

(The relative path header is set up by the inbound adapter).