Java File Watch Service(생성, 변경, 삭제 감지)

Java File Watch Service

WatchService를 이용한 디렉토리 변경 감지

1. WatchService를 사용해서 디렉토리 내의 file 삭제, 생성, 변경 감지.

• watchservice 의 create, modify, delete 감지

• 간단한 설명은 주석으로 .....

  WatchService watchService = FileSystems.getDefault().newWatchService();  
  Path path = FileSystems.getDefault().getPath("D:/watchTestDir");  
  path.register(watchService,  
       // Create Event
       StandardWatchEventKinds.ENTRY_CREATE,  
       // Delete Event
       StandardWatchEventKinds.ENTRY_DELETE,  
       // Modify Event
       StandardWatchEventKinds.ENTRY_MODIFY  
  );  
  while (true) {  
   // Service 실행
   WatchKey key = watchService.take();  
   List<WatchEvent<?>> watchEventList = key.pollEvents();  
   // List에서 WatchEvent를 하나씩 꺼내서 Event의 종류와 path 처리
   for (WatchEvent<?> event : watchEventList) {  
       // Event 종류
       WatchEvent.Kind<?> kind = event.kind();  
       // 감지된 file path
       Path filePath = (Path) event.context();  
  
       if (kind.equals(StandardWatchEventKinds.ENTRY_CREATE)) {  
           // Create됬을 때 실행
           System.out.println("Create : " + filePath.getFileName());  
       } else if (kind.equals(StandardWatchEventKinds.ENTRY_DELETE)) { 
           // Delete됬을 때 실행 
           System.out.println("Delete : " + filePath.getFileName());  
       } else if (kind.equals(StandardWatchEventKinds.ENTRY_MODIFY)) { 
           // Modify됬을 때 실행 
           System.out.println("Modify : " + filePath.getFileName());  
       } else if (kind.equals(StandardWatchEventKinds.OVERFLOW)) {  
           System.out.println("OVERFLOW");  
       }  
   }  
   if (!key.reset())  
       break;  
  }  
  watchService.close();