当我将File dir传递给messageChannel和InboundFileAdapter并从中读取文件时，如何执行要调用的集成流？

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.dsl.IntegrationFlow;
import org.springframework.integration.dsl.IntegrationFlows;
import org.springframework.integration.file.dsl.Files;
import org.springframework.integration.transformer.GenericTransformer;

@Configuration
public class FileIntegrationConfig {

    @Bean
    public IntegrationFlow fileReadingFlow() {
        return IntegrationFlows.from(Files.inboundAdapter(new File("inputDir"))
                .autoCreateDirectory(true)
                .filter(compositeFileListFilter()
                        .includePatterns("*.txt")
                        .maxSize(100000)),
                c -> c.poller(p -> p.fixedDelay(1000)))
                .transform(fileMessage -> {
                    // 处理文件消息
                    return processFile(fileMessage.getPayload());
                })
                .channel("fileProcessingChannel")
                .get();
    }

    @Bean
    public IntegrationFlow fileProcessingFlow() {
        return IntegrationFlows.from("fileProcessingChannel")
                .handle(message -> {
                    // 处理文件消息
                    System.out.println("Processing file: " + message.getPayload());
                })
                .get();
    }

    private String processFile(File file) {
        // 文件处理逻辑
        return file.getName();
    }
}