Java Apache Commons IO文件监视子文件夹中的捕获事件

我使用以下代码捕获给定文件夹中的事件。它工作正常，但我的问题是如何在给定文件夹的子文件夹中捕获事件

  import java.io.File;
  import java.io.IOException;

  import org.apache.commons.io.monitor.FileAlterationListener;
  import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
  import org.apache.commons.io.monitor.FileAlterationMonitor;
  import org.apache.commons.io.monitor.FileAlterationObserver;

  public class Monitor {

public Monitor() {

}

//path to a folder you are monitoring .

public static final String FOLDER = MYPATH;


public static void main(String[] args) throws Exception {
    System.out.println("monitoring started");
    // The monitor will perform polling on the folder every 5 seconds
    final long pollingInterval = 5 * 1000;

    File folder = new File(FOLDER);

    if (!folder.exists()) {
        // Test to see if monitored folder exists
        throw new RuntimeException("Directory not found: " + FOLDER);
    }

    FileAlterationObserver observer = new FileAlterationObserver(folder);
    FileAlterationMonitor monitor =
            new FileAlterationMonitor(pollingInterval);
    FileAlterationListener listener = new FileAlterationListenerAdaptor() {
        // Is triggered when a file is created in the monitored folder
        @Override
        public void onFileCreate(File file) {

                // "file" is the reference to the newly created file
                System.out.println("File created: "+ file.getCanonicalPath());


        }

        // Is triggered when a file is deleted from the monitored folder
        @Override
        public void onFileDelete(File file) {
            try {
                // "file" is the reference to the removed file
                System.out.println("File removed: "+ file.getCanonicalPath());
                // "file" does not exists anymore in the location
                System.out.println("File still exists in location: "+ file.exists());
            } catch (IOException e) {
                e.printStackTrace(System.err);
            }
        }
    };

    observer.addListener(listener);
    monitor.addObserver(observer);
    monitor.start();
}
} 

---

我在这里读到过，这段代码也应该捕获子文件夹中的事件，但我不工作

您在代码之后对超链接所做的声明不准确。中的代码确实捕获了主/根目录和子文件夹中的某些事件（文件创建、文件删除）。它不监视文件修改或文件夹操作（创建、删除、重命名等）

我刚刚在3个级别（嵌套子文件夹）上测试了它。因此，您引用的代码实现了您的要求。如果你需要一些不同的东西，请重新措辞你的问题

如果你需要关于这个主题的更多信息，你可能会发现这个链接：有用。它确实帮助了我