ApplicationConfig.java for Simple spring integration with springboot

ApplicationConfig.java

package com.javaxp;

import java.io.File;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.InboundChannelAdapter;
import org.springframework.integration.annotation.Poller;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.core.MessageSource;
import org.springframework.integration.file.filters.SimplePatternFileListFilter;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;

@Configuration
@EnableIntegration
public class ApplicationConfig {

	public static final String POLLING_LOCATION = "D:\\pollingLocation";
	public static final String FILE_PATTERN = "*.txt";
	public static final String OUTPUT_LOCATION = "D:\\outputLocation";

	@Bean
	public MessageChannel fileChannel() {
		return new DirectChannel();
	}
	@Bean
	@InboundChannelAdapter(value = "fileChannel", poller = @Poller(fixedDelay = "1000"))
	public MessageSource<File> fileReadingMessageSource() {
		File directory = new File(POLLING_LOCATION);
		SimplePatternFileListFilter filter = new SimplePatternFileListFilter(FILE_PATTERN);
		return new FilePoller(directory, filter);
	}
	@Bean
	@ServiceActivator(inputChannel = "fileChannel")
	public MessageHandler fileWritingMessageHandler() {
		return new FileHandler(OUTPUT_LOCATION);
	}
}