Java NIO2 - Watching a directory for changes. FileWatcherService.
File Watch Service
The NIO2 WatchService API provides the ability for java code to
watch for file modifications in a directory in the filesystem. A WatchService
object watches the folder it is registered with and signals the changes
detected through event notifications.
Steps to create a WatchService
- Create a WatchService object (FileSystem.newWatchService())
- Register the directories to be watched with the WatchService (WatchService.register())
- Watch for file change events (poll()/take() methods)
- Retrieve the event keys and process them
- Rest the key and got to step 3 to watch again.
Example code
Below is a simple working code.
import java.io.IOException; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.StandardWatchEventKinds; import java.nio.file.WatchEvent; import java.nio.file.WatchKey; import java.nio.file.WatchService; import java.util.List; import java.util.concurrent.TimeUnit; public class FileWatcherTest { private static void watchDir(Path dirPath) throws IOException, InterruptedException{ WatchService watchService = dirPath.getFileSystem().newWatchService(); dirPath.register(watchService, StandardWatchEventKinds.ENTRY_CREATE,StandardWatchEventKinds.ENTRY_DELETE,StandardWatchEventKinds.ENTRY_MODIFY); for(;;){ WatchKey key = watchService.take(); //WatchKey key = watchService.poll(25,TimeUnit.SECONDS); System.out.println("watch at :" + new java.util.Date() + " - key :" + key); if(key == null) continue; List<watchevent> events = key.pollEvents(); for(WatchEvent event : events){ System.out.println("Event :" + event.kind() + " " + event.context().toString()); } if(!key.reset()){ System.out.println("Breaking ..."); break; } } } public static void main(String[] args) throws IOException, InterruptedException { Path path = Paths.get("C:\\watchtest"); watchDir(path); } }A sample run gives following output.
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