java - Apache Commons IO 文件监控捕获子文件夹中的事件

Question

我使用以下代码来捕获给定文件夹中的事件。它工作正常，但我的问题是如何捕获给定文件夹中子文件夹中的事件？

  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();
}
} 

我读过这里enter link description here该代码应该也捕获子文件夹中的事件，但我不起作用。

Answer 1

您对代码后的超链接所做的声明不准确。 Capture events happening inside a directory中的代码确实捕获主/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 层以下(嵌套子文件夹)上对其进行了测试。因此，您所指的代码可以完成您所要求的任务。如果您需要不同的内容，请重新措辞/重新措辞您的问题。

如果您需要有关该主题的更多信息，您可以找到此链接:https://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/monitor/FileAlterationListenerAdaptor.html有用。这绝对对我有帮助。