问题描述

我已经使用 spring-integration java dsl 定义了一个流程来 ftp 传输文件，处理它，然后将其传输回存档"目录，最后将其移动到本地存档目录中.这是很容易"的事情:

I've defined a flow using spring-integration java dsl to ftp transfer a file, handle it, then transfer it back in an "archive" dir, and at last move it in a local archive dir. Which is something "quite easy" as:

@Bean
public IntegrationFlow ftpInboundFlow() {
    if (ftpProperties.getEnabled() == false) {
        return null;
    }
    logger.trace("Starting ftp flow");
    return IntegrationFlows
            .from(source -> source.ftp(ftpSessionFactory()).deleteRemoteFiles(true).preserveTimestamp(true)
                    .filter(compositeWithAcceptOnceFilter())                        .remoteDirectory(ftpProperties.getRemoteDirectory())
                    .localDirectory(new File(ftpProperties.getLocalDirectory())).autoCreateLocalDirectory(true),
            consumer -> consumer.id("ftpInboundAdapter")) /* Fine from() */
            .handle(new GenericHandler<File>() {

                @Override
                @Transactional
                public Object handle(File payload, Map<String, Object> headers) {
                    logger.debug("Data arrived {} {}", payload, payload.getClass().getName());
                    return payload;
                }

            }) /* Fine GenericHandler */
            .handleWithAdapter(a -> a.ftp(ftpSessionFactory())
                    .remoteDirectory(ftpProperties.getRemoteArchiveDirectory()).autoCreateDirectory(true))              
            .get();
}

如果我追加

.handleWithAdapter(a -> a.file("'" + ftpProperties.getLocalArchiveDirectory() + "'")
.autoCreateDirectory(true).deleteSourceFiles(true))

在 ftp 适配器配置后，bean 初始化程序回复以下错误消息:

after the ftp adapter configuration the bean initializer replies with the following error message:

Caused by: org.springframework.beans.factory.BeanCreationException: The 'currentComponent' (org.springframework.integration.file.remote.handler.FileTransferringMessageHandler@80bfa9d) is a one-way 'MessageHandler' and it isn't appropriate to configure 'outputChannel'. This is the end of the integration flow.

我应该如何解决它?

推荐答案

作为一种解决方法，我重构了我的代码，放弃了文件适配器:

As a workaround I refactored my code in giving up with the file adapter:

@Bean
public IntegrationFlow ftpInboundFlow() {
    return IntegrationFlows
        .from(source -> source.ftp(ftpSessionFactory()).deleteRemoteFiles(true).preserveTimestamp(true)
                .filter(compositeWithAcceptOnceFilter())                        .remoteDirectory(ftpProperties.getRemoteDirectory())
                .localDirectory(new File(ftpProperties.getLocalDirectory())).autoCreateLocalDirectory(true),
        consumer -> consumer.id("ftpInboundAdapter")) /* Fine from() */
        .handle(new GenericHandler<File>() {

            @Override
            @Transactional
            public Object handle(File payload, Map<String, Object> headers) {
                logger.debug("Data arrived {} {}", payload, payload.getClass().getName());
                /* handle file content here ... */
                /* ... then move it to archive */
                File dstFile = new File("archive", payload);
                FileUtils.moveFile(payload, dstFile);
                return dstFile;
            }

        }) /* Fine GenericHandler */
        /* Archive the remote file */
        .handleWithAdapter(a -> a.ftp(ftpSessionFactory())
                .remoteDirectory(ftpProperties.getRemoteArchiveDirectory()).autoCreateDirectory(true))              
        .get();

}

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