New Input/Output 2 - Beginning Java 8 Language Features - page 469

public class Watcher {
public static void main(String[] args) {
try (WatchService ws = FileSystems.getDefault().newWatchService()) {
// Get a Path object for C:\kishori directory to watch
Path dirToWatch = Paths.get("C:\\kishori");
// Register the path with the watch service for create,
// modifiy and delete events
dirToWatch.register(ws, ENTRY_CREATE, ENTRY_MODIFY, ENTRY_DELETE);
System.out.println("Watching " + dirToWatch + " for events.");
// Keep watching for events on the dirToWatch
while(true) {
// Retrieve and remove the next available WatchKey
WatchKey key = ws.take();
for(WatchEvent<?> event : key.pollEvents()) {
Kind<?> eventKind = event.kind();
if (eventKind == OVERFLOW) {
System.out.println("Event overflow occurred");
continue;
}
// Get the context of the event, which is the directory
// entry on which the event occurred.
WatchEvent<Path> currEvent = (WatchEvent<Path>)event;
Path dirEntry = currEvent.context();
// Print the event details
System.out.println(eventKind +
" occurred on " + dirEntry);
}
// Reset the key
boolean isKeyValid = key.reset();
if (!isKeyValid) {
System.out.println("No longer watching " + dirToWatch);
break;
}
}
}
catch (IOException | InterruptedException e) {
e.printStackTrace();
}
}
}