我会期望ftp同步机制更新一个更改的文件.但是,从这里可以看到,仅当文件不存在时才下载该文件.至于现在,即使时间戳记/内容已经更改,文件也不会在本地保存.
所以这是我到目前为止发现的
类org.springframework.integration.file.remote.synchronizer.AbstractInboundFileSynchronizer
@Override
public void synchronizetoLocalDirectory(final File localDirectory) {
final String remoteDirectory = this.remoteDirectoryExpression.getValue(this.evaluationContext,String.class);
try {
int transferred = this.remoteFileTemplate.execute(new SessionCallback<F,Integer>() {
@Override
public Integer doInSession(Session<F> session) throws IOException {
F[] files = session.list(remoteDirectory);
if (!ObjectUtils.isEmpty(files)) {
List<F> filteredFiles = filterFiles(files);
for (F file : filteredFiles) {
try {
if (file != null) {
copyFiletoLocalDirectory(
remoteDirectory,file,localDirectory,session);
}
}
catch (RuntimeException e) {
if (AbstractInboundFileSynchronizer.this.filter instanceof reversibleFileListFilter) {
((reversibleFileListFilter<F>) AbstractInboundFileSynchronizer.this.filter)
.rollback(file,filteredFiles);
}
throw e;
}
catch (IOException e) {
if (AbstractInboundFileSynchronizer.this.filter instanceof reversibleFileListFilter) {
((reversibleFileListFilter<F>) AbstractInboundFileSynchronizer.this.filter)
.rollback(file,filteredFiles);
}
throw e;
}
}
return filteredFiles.size();
}
else {
return 0;
}
}
});
if (this.logger.isDebugEnabled()) {
this.logger.debug(transferred + " files transferred");
}
}
catch (Exception e) {
throw new MessagingException("Problem occurred while synchronizing remote to local directory",e);
}
}
过滤要下载的文件.我想使用org.springframework.integration.ftp.filters.FtpPersistentAcceptOnceFileListFilter,它比较文件名和最后修改的日期.
然后,它将使用已过滤的文件(待复制)调用copyFiletoLocalDirectory函数.
protected void copyFiletoLocalDirectory(String remoteDirectoryPath,F remoteFile,File localDirectory,Session<F> session) throws IOException { String remoteFileName = this.getFilename(remoteFile); String localFileName = this.generateLocalFileName(remoteFileName); String remoteFilePath = remoteDirectoryPath != null ? (remoteDirectoryPath + this.remoteFileSeparator + remoteFileName) : remoteFileName; if (!this.isFile(remoteFile)) { if (this.logger.isDebugEnabled()) { this.logger.debug("cannot copy,not a file: " + remoteFilePath); } return; } File localFile = new File(localDirectory,localFileName); if (!localFile.exists()) { String tempFileName = localFile.getAbsolutePath() + this.temporaryFileSuffix; File tempFile = new File(tempFileName); OutputStream outputStream = new bufferedoutputstream(new FileOutputStream(tempFile)); try { session.read(remoteFilePath,outputStream); } catch (Exception e) { if (e instanceof RuntimeException) { throw (RuntimeException) e; } else { throw new MessagingException("Failure occurred while copying from remote to local directory",e); } } finally { try { outputStream.close(); } catch (Exception ignored2) { } } if (tempFile.renameto(localFile)) { if (this.deleteRemoteFiles) { session.remove(remoteFilePath); if (this.logger.isDebugEnabled()) { this.logger.debug("deleted " + remoteFilePath); } } } if (this.preserveTimestamp) { localFile.setLastModified(getModified(remoteFile)); } } }
但是,如果该文件已经存在于本地磁盘上,则此方法将仅检查(仅基于文件名),如果该文件不存在则仅下载.所以基本上没有机会下载更新的文件(带有新的时间戳).
我玩的时候试图改变FtpInboundFileSynchronizer,但它变得太复杂了.什么是“定制”Synchron- / copyToLocalDirectory方法的最佳方式？
解决方法
可以更新AbstractInboundFileSynchronizer以识别更新的文件,但它很脆弱,您遇到其他问题.
更新13 / Nov / 2016：找出如何在几秒钟内获得修改时间戳.
更新AbstractInboundFileSynchronizer的主要问题是它具有setter方法,但没有(protected)getter方法.如果将来,setter方法做得很聪明,这里介绍的更新版本会中断.
在本地目录中更新文件的主要问题是并发性：如果正在接收更新的同时处理本地文件,则可能会遇到各种麻烦.简单的方法是将本地文件移动到(临时)处理目录,以便可以接收更新作为新文件,从而无需更新AbstractInboundFileSynchronizer.另见骆驼时间戳remarks.
默认情况下,FTP服务器会在几分钟内提供修改时间戳.对于测试,我更新了FTP客户端以使用MLSD命令,该命令在几秒钟内提供修改时间戳(如果幸运的话,则为毫秒),但并不是所有的FTP服务器都支持这一点.
如Spring FTP reference所述,本地文件过滤器需要是FileSystemPersistentAcceptOnceFileListFilter,以确保修改时间戳更改时本地文件被拾取.
在我更新的AbstractInboundFileSynchronizer的版本之下,然后是我使用的一些测试类.
public class FtpUpdatingFileSynchronizer extends FtpInboundFileSynchronizer {
protected final Log logger = LogFactory.getLog(this.getClass());
private volatile Expression localFilenameGeneratorExpression;
private volatile EvaluationContext evaluationContext;
private volatile boolean deleteRemoteFiles;
private volatile String remoteFileSeparator = "/";
private volatile boolean preserveTimestamp;
public FtpUpdatingFileSynchronizer(SessionFactory<FTPFile> sessionFactory) {
super(sessionFactory);
setPreserveTimestamp(true);
}
@Override
public void setLocalFilenameGeneratorExpression(Expression localFilenameGeneratorExpression) {
super.setLocalFilenameGeneratorExpression(localFilenameGeneratorExpression);
this.localFilenameGeneratorExpression = localFilenameGeneratorExpression;
}
@Override
public void setIntegrationEvaluationContext(EvaluationContext evaluationContext) {
super.setIntegrationEvaluationContext(evaluationContext);
this.evaluationContext = evaluationContext;
}
@Override
public void setDeleteRemoteFiles(boolean deleteRemoteFiles) {
super.setDeleteRemoteFiles(deleteRemoteFiles);
this.deleteRemoteFiles = deleteRemoteFiles;
}
@Override
public void setRemoteFileSeparator(String remoteFileSeparator) {
super.setRemoteFileSeparator(remoteFileSeparator);
this.remoteFileSeparator = remoteFileSeparator;
}
@Override
public void setPreserveTimestamp(boolean preserveTimestamp) {
// updated
Assert.isTrue(preserveTimestamp,"for updating timestamps must be preserved");
super.setPreserveTimestamp(preserveTimestamp);
this.preserveTimestamp = preserveTimestamp;
}
@Override
protected void copyFiletoLocalDirectory(String remoteDirectoryPath,FTPFile remoteFile,Session<FTPFile> session) throws IOException {
String remoteFileName = this.getFilename(remoteFile);
String localFileName = this.generateLocalFileName(remoteFileName);
String remoteFilePath = (remoteDirectoryPath != null
? (remoteDirectoryPath + this.remoteFileSeparator + remoteFileName)
: remoteFileName);
if (!this.isFile(remoteFile)) {
if (this.logger.isDebugEnabled()) {
this.logger.debug("cannot copy,not a file: " + remoteFilePath);
}
return;
}
// start update
File localFile = new File(localDirectory,localFileName);
boolean update = false;
if (localFile.exists()) {
if (this.getModified(remoteFile) > localFile.lastModified()) {
this.logger.info("Updating local file " + localFile);
update = true;
} else {
this.logger.info("File already exists: " + localFile);
return;
}
}
// end update
String tempFileName = localFile.getAbsolutePath() + this.getTemporaryFileSuffix();
File tempFile = new File(tempFileName);
OutputStream outputStream = new bufferedoutputstream(new FileOutputStream(tempFile));
try {
session.read(remoteFilePath,outputStream);
} catch (Exception e) {
if (e instanceof RuntimeException) {
throw (RuntimeException) e;
}
else {
throw new MessagingException("Failure occurred while copying from remote to local directory",e);
}
} finally {
try {
outputStream.close();
}
catch (Exception ignored2) {
}
}
// updated
if (update && !localFile.delete()) {
throw new MessagingException("Unable to delete local file [" + localFile + "] for update.");
}
if (tempFile.renameto(localFile)) {
if (this.deleteRemoteFiles) {
session.remove(remoteFilePath);
if (this.logger.isDebugEnabled()) {
this.logger.debug("deleted " + remoteFilePath);
}
}
// updated
this.logger.info("Stored file locally: " + localFile);
} else {
// updated
throw new MessagingException("Unable to rename temporary file [" + tempFile + "] to [" + localFile + "]");
}
if (this.preserveTimestamp) {
localFile.setLastModified(getModified(remoteFile));
}
}
private String generateLocalFileName(String remoteFileName) {
if (this.localFilenameGeneratorExpression != null) {
return this.localFilenameGeneratorExpression.getValue(this.evaluationContext,remoteFileName,String.class);
}
return remoteFileName;
}
}
遵循我使用的一些测试类.
我使用依赖关系org.springframework.integration：spring-integration-ftp：4.3.5.RELEASE和org.apache.ftpserver：ftpserver-core：1.0.6(加上通常的日志和测试依赖项).
public class TestFtpSync {
static final Logger log = LoggerFactory.getLogger(TestFtpSync.class);
static final String FTP_ROOT_DIR = "target" + File.separator + "ftproot";
// org.apache.ftpserver:ftpserver-core:1.0.6
static FtpServer server;
@BeforeClass
public static void startServer() throws FtpException {
File ftpRoot = new File (FTP_ROOT_DIR);
ftpRoot.mkdirs();
TestUserManager userManager = new TestUserManager(ftpRoot.getAbsolutePath());
FtpServerFactory serverFactory = new FtpServerFactory();
serverFactory.setUserManager(userManager);
ListenerFactory factory = new ListenerFactory();
factory.setPort(4444);
serverFactory.addListener("default",factory.createListener());
server = serverFactory.createServer();
server.start();
}
@AfterClass
public static void stopServer() {
if (server != null) {
server.stop();
}
}
File ftpFile = Paths.get(FTP_ROOT_DIR,"test1.txt").toFile();
File ftpFile2 = Paths.get(FTP_ROOT_DIR,"test2.txt").toFile();
@Test
public void syncDir() {
// org.springframework.integration:spring-integration-ftp:4.3.5.RELEASE
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
try {
ctx.register(FtpSyncConf.class);
ctx.refresh();
PollableChannel msgChannel = ctx.getBean("inputChannel",PollableChannel.class);
for (int j = 0; j < 2; j++) {
for (int i = 0; i < 2; i++) {
storeFtpFile();
}
for (int i = 0; i < 4; i++) {
fetchMessage(msgChannel);
}
}
} catch (Exception e) {
throw new AssertionError("FTP test Failed.",e);
} finally {
ctx.close();
cleanup();
}
}
boolean tswitch = true;
void storeFtpFile() throws IOException,InterruptedException {
File f = (tswitch ? ftpFile : ftpFile2);
tswitch = !tswitch;
log.info("Writing message " + f.getName());
Files.write(f.toPath(),("Hello " + System.currentTimeMillis()).getBytes());
}
Message<?> fetchMessage(PollableChannel msgChannel) {
log.info("Fetching message.");
Message<?> msg = msgChannel.receive(1000L);
if (msg == null) {
log.info("No message.");
} else {
log.info("Have a message: " + msg);
}
return msg;
}
void cleanup() {
delFile(ftpFile);
delFile(ftpFile2);
File d = new File(FtpSyncConf.LOCAL_DIR);
if (d.isDirectory()) {
for (File f : d.listFiles()) {
delFile(f);
}
}
log.info("Finished cleanup");
}
void delFile(File f) {
if (f.isFile()) {
if (f.delete()) {
log.info("Deleted " + f);
} else {
log.error("Cannot delete file " + f);
}
}
}
}
public class MlistFtpSessionFactory extends AbstractFtpSessionFactory<MlistFtpClient> {
@Override
protected MlistFtpClient createClientInstance() {
return new MlistFtpClient();
}
}
public class MlistFtpClient extends FTPClient {
@Override
public FTPFile[] listFiles(String pathname) throws IOException {
return super.mlistDir(pathname);
}
}
@EnableIntegration
@Configuration
public class FtpSyncConf {
private static final Logger log = LoggerFactory.getLogger(FtpSyncConf.class);
public static final String LOCAL_DIR = "/tmp/received";
@Bean(name = "ftpMetaData")
public ConcurrentMetadataStore ftpMetaData() {
return new SimpleMetadataStore();
}
@Bean(name = "localMetaData")
public ConcurrentMetadataStore localMetaData() {
return new SimpleMetadataStore();
}
@Bean(name = "ftpFileSyncer")
public FtpUpdatingFileSynchronizer ftpFileSyncer(
@Qualifier("ftpMetaData") ConcurrentMetadataStore MetadataStore) {
MlistFtpSessionFactory ftpSessionFactory = new MlistFtpSessionFactory();
ftpSessionFactory.setHost("localhost");
ftpSessionFactory.setPort(4444);
ftpSessionFactory.setUsername("demo");
ftpSessionFactory.setPassword("demo");
FtpPersistentAcceptOnceFileListFilter fileFilter = new FtpPersistentAcceptOnceFileListFilter(MetadataStore,"ftp");
fileFilter.setFlushOnUpdate(true);
FtpUpdatingFileSynchronizer ftpFileSync = new FtpUpdatingFileSynchronizer(ftpSessionFactory);
ftpFileSync.setFilter(fileFilter);
// ftpFileSync.setDeleteRemoteFiles(true);
return ftpFileSync;
}
@Bean(name = "syncFtp")
@InboundChannelAdapter(value = "inputChannel",poller = @Poller(fixedDelay = "500",maxMessagesPerPoll = "1"))
public MessageSource<File> syncChannel(
@Qualifier("localMetaData") ConcurrentMetadataStore MetadataStore,@Qualifier("ftpFileSyncer") FtpUpdatingFileSynchronizer ftpFileSync) throws Exception {
FtpInboundFileSynchronizingMessageSource messageSource = new FtpInboundFileSynchronizingMessageSource(ftpFileSync);
File receiveDir = new File(LOCAL_DIR);
receiveDir.mkdirs();
messageSource.setLocalDirectory(receiveDir);
messageSource.setLocalFilter(new FileSystemPersistentAcceptOnceFileListFilter(MetadataStore,"local"));
log.info("Message source bean created.");
return messageSource;
}
@Bean(name = "inputChannel")
public PollableChannel inputChannel() {
QueueChannel channel = new QueueChannel();
log.info("Message channel bean created.");
return channel;
}
}
/**
* copied from https://github.com/spring-projects/spring-integration-samples/tree/master/basic/ftp/src/test/java/org/springframework/integration/samples/ftp/support
* @author Gunnar Hillert
*
*/
public class TestUserManager extends AbstractUserManager {
private BaseUser testUser;
private BaseUser anonUser;
private static final String TEST_USERNAME = "demo";
private static final String TEST_PASSWORD = "demo";
public TestUserManager(String homeDirectory) {
super("admin",new ClearTextPasswordEncryptor());
testUser = new BaseUser();
testUser.setAuthorities(Arrays.asList(new Authority[] {new ConcurrentLoginPermission(1,1),new WritePermission()}));
testUser.setEnabled(true);
testUser.setHomeDirectory(homeDirectory);
testUser.setMaxIdleTime(10000);
testUser.setName(TEST_USERNAME);
testUser.setPassword(TEST_PASSWORD);
anonUser = new BaseUser(testUser);
anonUser.setName("anonymous");
}
public User getUserByName(String username) throws FtpException {
if(TEST_USERNAME.equals(username)) {
return testUser;
} else if(anonUser.getName().equals(username)) {
return anonUser;
}
return null;
}
public String[] getAllUserNames() throws FtpException {
return new String[] {TEST_USERNAME,anonUser.getName()};
}
public void delete(String username) throws FtpException {
throw new UnsupportedOperationException("Deleting of FTP Users is not supported.");
}
public void save(User user) throws FtpException {
throw new UnsupportedOperationException("Saving of FTP Users is not supported.");
}
public boolean doesExist(String username) throws FtpException {
return (TEST_USERNAME.equals(username) || anonUser.getName().equals(username)) ? true : false;
}
public User authenticate(Authentication authentication) throws AuthenticationFailedException {
if(UsernamePasswordAuthentication.class.isAssignableFrom(authentication.getClass())) {
UsernamePasswordAuthentication upAuth = (UsernamePasswordAuthentication) authentication;
if(TEST_USERNAME.equals(upAuth.getUsername()) && TEST_PASSWORD.equals(upAuth.getpassword())) {
return testUser;
}
if(anonUser.getName().equals(upAuth.getUsername())) {
return anonUser;
}
} else if(AnonymousAuthentication.class.isAssignableFrom(authentication.getClass())) {
return anonUser;
}
return null;
}
}
更新15 / Nov / 2016：xml配置注意事项.
通过spring-integration-ftp-4.3.5.RELEASE.jar！/ meta-inf / spring,通过FtpNamespaceHandler通过org.springframework.integration.ftp.config.FtpInboundChannelAdapterParser将xml-element入站通道适配器直接链接到FtpInboundFileSynchronizer .handlers.
遵循xml-custom参考指南,在本地meta-inf / spring.handlers文件中指定自定义FtpNamespaceHandler应允许您使用FtpUpdatingFileSynchronizer而不是FtpInboundFileSynchronizer.它并没有为我的单元测试工作,一个正确的解决方案可能涉及创建额外的/修改的xsd文件,以便常规入站通道适配器正在使用常规FtpInboundFileSynchronizer和一个特殊的入站更新通道适配器是使用FtpUpdatingFileSynchronizer.正确地做这个是有点超出了这个答案的范围.
一个快速的黑客可以让你开始.您可以通过在本地项目中创建包org.springframework.integration.ftp.config和类FtpNamespaceHandler来覆盖默认的FtpNamespaceHandler.内容如下：
package org.springframework.integration.ftp.config; public class FtpNamespaceHandler extends org.springframework.integration.config.xml.AbstractIntegrationNamespaceHandler { @Override public void init() { System.out.println("Initializing FTP updating file synchronizer."); // one updated line below,rest copied from original FtpNamespaceHandler registerBeanDeFinitionParser("inbound-channel-adapter",new MyFtpInboundChannelAdapterParser()); registerBeanDeFinitionParser("inbound-streaming-channel-adapter",new FtpStreamingInboundChannelAdapterParser()); registerBeanDeFinitionParser("outbound-channel-adapter",new FtpOutboundChannelAdapterParser()); registerBeanDeFinitionParser("outbound-gateway",new FtpOutboundGatewayParser()); } } package org.springframework.integration.ftp.config; import org.springframework.integration.file.remote.synchronizer.InboundFileSynchronizer; import org.springframework.integration.ftp.config.FtpInboundChannelAdapterParser; public class MyFtpInboundChannelAdapterParser extends FtpInboundChannelAdapterParser { @Override protected Class<? extends InboundFileSynchronizer> getInboundFileSynchronizerClass() { System.out.println("Returning updating file synchronizer."); return FtpUpdatingFileSynchronizer.class; } }
另外在xml文件中添加preserve-timestamp =“true”,以防止新的IllegalArgumentException：必须保留更新时间戳.
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