java - 如何跟踪除 nio 之外的文件夹/文件

Question

除了nio之外，还有什么有用的文件夹/文件跟踪器吗？为什么除了nio？因为当我创建和更新文件时它给出相同的输出。我需要更清晰的观察者来查看所有更新(创建、更新、删除)。

下面是主要内容:

try {
            Path trackFolder = Paths.get("C:\\Users\\folder_to_watch");
            WatchService watchService = FileSystems.getDefault().newWatchService();
            trackFolder.register(watchService, StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_MODIFY, StandardWatchEventKinds.ENTRY_DELETE);



            boolean valid = true;
            do {
                WatchKey watchKey = watchService.take();


                    for (WatchEvent event : watchKey.pollEvents()) {
                        //WatchEvent.Kind kind = event.kind();


                        if (StandardWatchEventKinds.ENTRY_CREATE.equals(event.kind())) {
                            String createdFileName = event.context().toString();
                            Date date = new Date();

                            System.out.println("FILE CREATED:  " + createdFileName +" "+ date );

                        } else if (StandardWatchEventKinds.ENTRY_MODIFY.equals(event.kind())) {
                            String updatedFileName = event.context().toString();
                            Date date = new Date();

                            System.out.println("FILE UPDATED:  " + updatedFileName +" "+ date);

                        }

                        else if (StandardWatchEventKinds.ENTRY_DELETE.equals(event.kind())) {
                            String deletedFileName = event.context().toString();
                            Date date = new Date();

                            System.out.println("FILE DELETED:  " + deletedFileName +" "+ date);

                        }

                }
                valid = watchKey.reset();

            } while (valid);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

谢谢。 ------------------------

Answer 1

怎么样WatchService API来自java.nio ？更改的类型(在 StandardWatchEventKinds 中列出)可以从 WatchEvent.Kind<?> 获取