我有一个要求，我需要在unix位置连续查找文件。一旦它可用，那么我需要解析它并转换为一些json格式。这需要使用Spring集成 - DSL完成。 以下是我从Spring网站获得的一段代码，但它显示以下异常：
o.s.integration.handler.LoggingHandler: org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'application.processFileChannel'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
以下是代码：
@SpringBootApplication
public class FileReadingJavaApplication {
public static void main(String[] args) {
new SpringApplicationBuilder(FileReadingJavaApplication.class)
.web(false)
.run(args);
}
@Bean
public IntegrationFlow fileReadingFlow() {
return IntegrationFlows
.from(s -> s.file(new File("Y://"))
.patternFilter("*.txt"),
e -> e.poller(Pollers.fixedDelay(1000)))
.transform(Transformers.fileToString())
.channel("processFileChannel")
.get();
}
}
新守则：
@SpringBootApplication 公共类SpringIntegration {
public static void main(String[] args) {
new SpringApplicationBuilder(SpringIntegration.class)
.web(false)
.run(args);
}
@Bean
public SessionFactory<LsEntry> sftpSessionFactory() {
DefaultSftpSessionFactory factory = new DefaultSftpSessionFactory(true);
factory.setHost("ip");
factory.setPort(port);
factory.setUser("username");
factory.setPassword("pwd");
factory.setAllowUnknownKeys(true);
return new CachingSessionFactory<LsEntry>(factory);
}
@Bean
public SftpInboundFileSynchronizer sftpInboundFileSynchronizer() {
SftpInboundFileSynchronizer fileSynchronizer = new SftpInboundFileSynchronizer(sftpSessionFactory());
fileSynchronizer.setDeleteRemoteFiles(false);
fileSynchronizer.setRemoteDirectory("remote dir");
fileSynchronizer.setFilter(new SftpSimplePatternFileListFilter("*.txt"));
return fileSynchronizer;
}
@Bean
@InboundChannelAdapter(channel = "sftpChannel", poller = @Poller(fixedDelay = "1000", maxMessagesPerPoll = "1"))
public MessageSource ftpMessageSource() {
SftpInboundFileSynchronizingMessageSource source =
new SftpInboundFileSynchronizingMessageSource(sftpInboundFileSynchronizer());
source.setLocalFilter(new AcceptOnceFileListFilter<File>());
source.setLocalDirectory(new File("Local directory"));
return source;
}
@Bean
@ServiceActivator(inputChannel = "fileInputChannel")
public MessageHandler handler() {
return new MessageHandler() {
@Override
public void handleMessage(Message<?> message) throws MessagingException {
System.out.println("File Name : "+message.getPayload());
}
};
}
@Bean public static StandardIntegrationFlow processFileFlow（）{ 返回IntegrationFlows 。从（＆＃34; fileInputChannel＆＃34）分裂（）。 .handle（＆＃34; fileProcessor＆＃34;，＆＃34; process＆＃34;）。get（）;
}
@Bean
@InboundChannelAdapter(value = "fileInputChannel", poller = @Poller(fixedDelay = "1000"))
public MessageSource<File> fileReadingMessageSource() {
AcceptOnceFileListFilter<File> filters =new AcceptOnceFileListFilter<>();
FileReadingMessageSource source = new FileReadingMessageSource();
source.setAutoCreateDirectory(true);
source.setDirectory(new File("Local directory"));
source.setFilter(filters);
return source;
}
@Bean
public FileProcessor fileProcessor() {
return new FileProcessor();
}
@Bean
@ServiceActivator(inputChannel = "fileInputChannel")
public AmqpOutboundEndpoint amqpOutbound(AmqpTemplate amqpTemplate) {
AmqpOutboundEndpoint outbound = new AmqpOutboundEndpoint(amqpTemplate);
outbound.setExpectReply(true);
outbound.setRoutingKey("foo"); // default exchange - route to queue 'foo'
return outbound;
}
@MessagingGateway(defaultRequestChannel = "amqpOutboundChannel")
public interface MyGateway {
String sendToRabbit(String data);
}
}
FileProcessor：
public class FileProcessor {
public void process(Message<String> msg) {
String content = msg.getPayload();
JSONObject jsonObject ;
Map<String, String> dataMap = new HashMap<String, String>();
for(int i=0;i<=content.length();i++){
String userId = content.substring(i+5,i+16);
dataMap = new HashMap<String, String>();
dataMap.put("username", username.trim());
i+=290; //each record of size 290 in file
jsonObject = new JSONObject(dataMap);
System.out.println(jsonObject);
}
}
}