Java實現紀錄檔檔案監聽並讀取相關資料的方法實踐

<dependency>
 <groupId>commons-io</groupId>
 <artifactId>commons-io</artifactId>
 <version>2.7</version>
</dependency>

/**
 * 檔案監聽類
 * @author Greenarrow
 * @date 2022-05-12 14:43
 **/
public class FileListener extends FileAlterationListenerAdaptor {

    private static Logger logger = LoggerFactory.getLogger(FileListener.class);
    @Override
    public void onStart(FileAlterationObserver observer) {
        super.onStart(observer);
        logger.info("onStart");
    }

    @Override
    public void onDirectoryCreate(File directory) {
        logger.info("[新建]:" + directory.getAbsolutePath());
    }

    @Override
    public void onDirectoryChange(File directory) {
        logger.info("[修改]:" + directory.getAbsolutePath());
    }

    @Override
    public void onDirectoryDelete(File directory) {
        logger.info("[刪除]:" + directory.getAbsolutePath());
    }

    @Override
    public void onFileCreate(File file) {
        String compressedPath = file.getAbsolutePath();
        logger.info("[新建]:" + compressedPath);
        List<String> contentList = null;
        try {
            if (file.canRead()){
                // 將檔案按行讀取為字串集合
                contentList = FileUtils.readLines(new File(compressedPath), StandardCharsets.UTF_8);
                if (CollectionUtil.isNotEmpty(contentList)){
                    // 獲取對應格式的資料並輸出，這裡可自行新增業務處理
                    List<String> dirtyRecord  = contentList.stream().filter(s -> s.startsWith("{") && s.endsWith("}")).collect(Collectors.toList());
                    dirtyRecord.forEach(System.out::println);
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
            logger.error("讀取檔案內容失敗",e);
        }
    }

    @Override
    public void onFileChange(File file) {
        String compressedPath = file.getAbsolutePath();
        logger.info("[修改]:" + compressedPath);
    }

    @Override
    public void onFileDelete(File file) {
        logger.info("[刪除]:" + file.getAbsolutePath());
    }

    @Override
    public void onStop(FileAlterationObserver observer) {
        super.onStop(observer);
        logger.info("onStop");
    }
}

/**
 * 檔案監聽測試 demo
 * @author Greenarrow
 * @date 2022-05-12 14:45
 **/
public class FileMonitor {

    FileAlterationMonitor monitor = null;

    public FileMonitor(long interval) throws Exception {
        monitor = new FileAlterationMonitor(interval);
    }

    /**
     * 給檔案新增監聽
     * @param path
     * @param listener
     */
    public void monitor(String path, FileAlterationListener listener) {
        FileAlterationObserver observer = new FileAlterationObserver(new File(path));
        monitor.addObserver(observer);
        observer.addListener(listener);
    }

    public void stop() throws Exception {
        monitor.stop();
    }

    public void start() throws Exception {
        monitor.start();

    }
}

/**
 * 專案啟動之後開啟檔案監聽功能
 * @author Greenarrow
 * @date 2022-05-12 10:02
 **/
@Component
// @Order(Integer.MIN_VALUE)
public class DirtyRecordRunner implements CommandLineRunner {

    private static Logger logger = LoggerFactory.getLogger(DirtyRecordRunner.class);

    @Value("${test}")
    private String path;

    @Override
    public void run(String... args) throws Exception {
        logger.info(this.getClass().getName()+"[開啟資料夾監聽功能]");
        FileMonitor fileMonitor = new FileMonitor(1000);
        fileMonitor.monitor(path,new FileListener());
        fileMonitor.start();
    }
}