使用Spring Integration SFTP DSL递归读取文件

我试图从所有子文件夹递归地从远程服务器中读取Spring Integration SFTP读取文件（.txt） . 远程文件夹类似于“/ tmp / remoteFolder”，所有子文件夹都是日期文件夹，如“/ tmp / remoteFolder / 20180830”，“/ tmp / remoteFolder / 20170902” .

这是我到目前为止的代码

@Bean
@InboundChannelAdapter(value = "sftpMgetInputChannel",
    poller = @Poller(fixedDelay = "5000"))
public IntegrationFlow sftpMGetFlow() {
    return IntegrationFlows.from("sftpMgetInputChannel")
            .handleWithAdapter(h -> h.sftpGateway(this.sftpSessionFactory,
             Command.MGET, "'/tmp/remoteDirectory/*'")
            .options(Option.RECURSIVE)
            .regexFileNameFilter("((\\d{8})|*\\.txt)")
            .localDirectoryExpression("sftp-inbound" + "/" + "#remoteDirectory"))
            .channel(remoteFileOutputChannel())
            .get();
}

@Bean
public MessageChannel sftpMgetInboundChannel(){
   return new DirectChannel();
}

@Bean
public PollableChannel remoteFileOutputChannel() {
    return new QueueChannel();
}

如何将sftp mget的根远程目录指定为/ tmp / remoteFolder？为什么这不起作用？为什么我需要指定输出通道？

更新：我没有调用channel（remoteFileOutputChannel（））而是调用这样的处理程序

@Bean
public MessageHandler messageHandler(){
 return new MessageHandler() { ... }
}

代码更新：

@InboundChannelAdapter(value = "sftpMgetInputChannel",
        poller = @Poller(fixedDelay = "5000"))
    public String filesForMGET(){
      return "'/tmp/input/remoteDirectory/*'";
    }

    @Bean
    public IntegrationFlow sftpMGetFlow() {
        return IntegrationFlows.from("sftpMgetInputChannel")
                .handleWithAdapter(h -> h.sftpGateway(this.sftpSessionFactory,
                 Command.MGET, "payload")
                .options(Option.RECURSIVE)
                .regexFileNameFilter("((\\d{8})|*\\.txt)")
                .localDirectoryExpression("'sftp-inbound/'" + "#remoteDirectory"))
                .handler(messageHandler())
                .get();
    }

    @Bean
    public MessageChannel sftpMgetInboundChannel(){
       return new DirectChannel();
    }

    @Bean
    public MessageHandler messageHandler(){
     return new MessageHandler() { ... }
    }

使用此更新的代码，我收到以下错误：

rg.springframework.core.NestedIOException: failed to read file; nested exception is 2: No such file
        at org.springframework.integration.sftp.session.SftpSession.read(SftpSession.java:100)
        at org.springframework.integration.file.remote.session.CachingSessionFactory$CachedSession.read(CachingSessionFactory.java:137)
        at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.copyFileToLocalDirectory(AbstractInboundFileSynchronizer.java:176)
        at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer.synchronizeToLocalDirectory(AbstractInboundFileSynchronizer.java:138)
        at org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizingMessageSource.receive(AbstractInboundFileSynchronizingMessageSource.java:144)
        at org.springframework.integration.endpoint.SourcePollingChannelAdapter.doPoll(SourcePollingChannelAdapter.java:89)
        at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:146)
        at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:144)
        at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller$1.run(AbstractPollingEndpoint.java:207)
        at org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:52)
        at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:48)
        at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:49)
        at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:202)
        at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:51)
        at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)
    Caused by: 2: No such file
        at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:2289)
        at com.jcraft.jsch.ChannelSftp._stat(ChannelSftp.java:1741)
        at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:1011)
        at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:986)
        at org.springframework.integration.sftp.session.SftpSession.read(SftpSession.java:96)
        ... 22 more