如何在Java1.7中通过Spring DSL将消息从文件入站适配器传输到Sftp出站适配器

Question

@Bean
public IntegrationFlow fileReadingFlow() {          
    return IntegrationFlows
            .from(fileMessageSource(),
                    new Consumer<SourcePollingChannelAdapterSpec>() {

                        @Override
                        public void accept(SourcePollingChannelAdapterSpec e) {
                            e.autoStartup(true).poller(Pollers.fixedRate(6000)
                                            .maxMessagesPerPoll(1));
                        }
                    }).transform(Transformers.fileToByteArray())
            .channel(MessageChannels.queue("fileReadingResultChannel"))
            .get();
}

@Bean
public MessageSource<File> fileMessageSource() {

    FileReadingMessageSource source = new FileReadingMessageSource();
    source.setDirectory(new File(localDir));    
    source.setAutoCreateDirectory(true);        
    return source;
}

@Bean
public IntegrationFlow sftpOutboundFlow() {
    System.out.println("enter out  bound flow.....");
    return IntegrationFlows
            .from("toSftpChannel")
            .handle(Sftp.outboundAdapter(this.sftpSessionFactory)
                    .remoteFileSeparator("\\")
                    .useTemporaryFileName(false)
                    .remoteDirectory(remDir)).get();
}

Answer 1

您不需要将文件读入内存；sftp适配器将读取它并直接发送。

@Bean
public IntegrationFlow transferFlow() {
    return IntegrationFlows.from(Files.inboundAdapter(new File("/tmp/foo")),
                new Consumer<SourcePollingChannelAdapterSpec>() {

                    @Override
                    public void accept(SourcePollingChannelAdapterSpec e) {
                        e
                        .autoStartup(true)
                        .poller(Pollers
                            .fixedDelay(5000)
                            .maxMessagesPerPoll(1));
                    }
                })
            .handle(Sftp.outboundAdapter(this.sftpSessionFactory)
                    .useTemporaryFileName(false)
                    .remoteDirectory("destDir"))
            .get();
}

如果您希望将其保持为两个独立的流，只需使用通道bean将它们连接起来：

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

第一个以.channel(foo())结束，第二个以.from(foo())开始。