Spring :无法重命名.writing文件

Question

我正在使用Spring集成来传输文件，而且很多时候我都遇到了这个错误。看起来两个线程试图传输同一个文件，并且相互冲突。

2020-08-03 08:31:55,766 INF任务-调度程序-8 o.s.i.ftp.session.FtpSession -文件已从./abc.ext.200803成功传输

2020-08-03 08:31:55,849 INF任务-调度程序-7 o.s.i.ftp.session.FtpSession -文件已从./abc.ext.200803成功传输

2020-08-03 08:31:55,850 INF任务-调度程序-7 .s.i.f.i.FtpInboundFileSynchronizer -不能重命名'/ local /download/abc.ext.200803‘在删除后写入本地文件’/local/download/abc.ext.200803‘。本地文件可能在其他进程中很忙.

有没有办法让两个线程不应该互相干扰？

我用的是以下代码-

@Bean
public SftpInboundFileSynchronizer ftpInboundFileSynchronizer() {
    isFTPSessionOK();
    SftpInboundFileSynchronizer fileSynchronizer = new SftpInboundFileSynchronizer(sftpSessionFactory());

    fileSynchronizer.setPreserveTimestamp(true);
    fileSynchronizer.setRemoteDirectory(remoteDirectory);
    fileSynchronizer.setDeleteRemoteFiles(false);

    fileSynchronizer.setFilter(new SFTPLastModifiedFileFilter(remoteFileFilter));
    return fileSynchronizer;
}

private boolean isFTPSessionOK() {
    try {
        SessionFactory<LsEntry> ftpSessionFactory = sftpSessionFactory();
        boolean open = ftpSessionFactory.getSession().isOpen();
        LOG.info("FTPSession is good ? " + open);
        return open;
    } catch (Exception e) {
        LOG.error("FTPSession is not good because of error : " + e);
    }
    return false;
}

@Bean
public SessionFactory<LsEntry> sftpSessionFactory() {
    DefaultSftpSessionFactory sf = new DefaultSftpSessionFactory();
    sf.setHost(server);
    sf.setPort(port);
    sf.setUser(username);
    sf.setPassword(password);
    sf.setAllowUnknownKeys(true);
    return new CachingSessionFactory<LsEntry>(sf);
}

@Bean
@InboundChannelAdapter(channel = "sftpChannel", poller = @Poller(fixedDelay = "${${project.name}.ftp.poller.delay:600000}", maxMessagesPerPoll = "1"))
public MessageSource<File> ftpMessageSource() {
    SftpInboundFileSynchronizingMessageSource source = new SftpInboundFileSynchronizingMessageSource(ftpInboundFileSynchronizer());
    source.setLocalDirectory(new File(localFtpDirectory));
    source.setAutoCreateLocalDirectory(true);       
    return source;
}

@Bean
@ServiceActivator(inputChannel = "sftpChannel")
public MessageHandler ftpHandler() {
    return new MessageHandler() {

        @Override
        public void handleMessage(Message<?> message) throws MessagingException {
            LOG.info("File '{}' is ready for reading after SFTP", message.getPayload());
        }
    };
}

Answer 1

您只有这一项用于过滤：

fileSynchronizer.setFilter(new SFTPLastModifiedFileFilter(remoteFileFilter));

但是，在接下来的投票中，防止重复的过滤器又该怎么办呢？

见AcceptOnceFileListFilter。和那个SFTPLastModifiedFileFilter一起使用一个ChainFileListFilter。

有关更多信息，请参见文档：

https://docs.spring.io/spring-integration/docs/current/reference/html/sftp.html#sftp-inbound

https://docs.spring.io/spring-integration/docs/current/reference/html/file.html#file-reading