SpringBoot项目中如何对指定目录下的文件变动进行监听

1. 引入maven依赖

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.17.0</version>
</dependency>

2. 编写demo程序

package com.demo.fileListener;

import jakarta.annotation.PostConstruct;
import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.apache.commons.io.monitor.FileAlterationObserver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import java.io.File;

@Component
public class DirObserverTest {

    Logger log = LoggerFactory.getLogger(this.getClass());

    @PostConstruct
    public void init() throws Exception {

        // 观察指定目录：F:\dirObserverTest下的，以.json和.txt结尾的文件变动。
        FileAlterationObserver observer = new FileAlterationObserver("F:\\dirObserverTest", pathname -> pathname.getName().endsWith(".json") || pathname.getName().endsWith(".txt"));

        DirListener listener = new DirListener();
        observer.addListener(listener);

        FileAlterationMonitor monitor = new FileAlterationMonitor();
        monitor.addObserver(observer);

        monitor.start();
        log.info("目录监听已启动................");
    }

}

/**
 * 自定义监听器
 */
class DirListener extends FileAlterationListenerAdaptor {

    Logger log = LoggerFactory.getLogger(this.getClass());

    @Override
    public void onFileCreate(File file) {
        log.info("文件被创建：{}", file.getAbsoluteFile());
        super.onFileCreate(file);
    }

    @Override
    public void onFileChange(File file) {
        log.info("文件变化：{}", file.getAbsoluteFile());
        super.onFileChange(file);
    }

    @Override
    public void onFileDelete(File file) {
        log.info("文件被删除：{}", file.getAbsoluteFile());
        super.onFileDelete(file);
    }

    @Override
    public void onDirectoryChange(File directory) {
        log.info("目录变化：{}", directory.getAbsoluteFile());
        super.onDirectoryChange(directory);
    }

    @Override
    public void onDirectoryCreate(File directory) {
        log.info("目录新增：{}", directory.getAbsoluteFile());
        super.onDirectoryCreate(directory);
    }

    @Override
    public void onDirectoryDelete(File directory) {
        log.info("目录删除：{}", directory.getAbsoluteFile());
        super.onDirectoryDelete(directory);
    }

    @Override
    public void onStart(FileAlterationObserver observer) {
        // 周期(默认10s一次)性检测-开始
        log.info("onStart：{}", observer.getDirectory().getAbsoluteFile());
        super.onStart(observer);
    }

    @Override
    public void onStop(FileAlterationObserver observer) {
        // 周期(默认10s一次)性检测-结束
        log.info("onStop：{}", observer.getDirectory().getAbsoluteFile());
        super.onStop(observer);
    }
}

3. 测试

启动程序后，在对应目录下创建、修改、删除以.json、.txt为后缀的文件，都将看到控制台输出对应事件的日志。