Watch for an image folder - Java File Path IO

Java examples for File Path IO:File Watcher

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Description

Watch for an image folder

Demo Code

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardWatchEventKinds;
import java.nio.file.WatchEvent;
import java.nio.file.WatchEvent.Kind;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.TimeUnit;

public class Main {
  public static void main(String[] args) throws Exception {
    final Path path = Paths.get("C:/security");
    WatchService watchService = FileSystems.getDefault().newWatchService();
    path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE);
    OUTERMOST: while (true) {
      WatchKey key = watchService.poll(11, TimeUnit.SECONDS);
      if (key == null) {
        System.out.println("canceled!");
        break;/*www .j  av  a2 s.c o m*/
      } else {
        for (WatchEvent<?> watchEvent : key.pollEvents()) {
          Kind<?> kind = watchEvent.kind();
          if (kind == StandardWatchEventKinds.OVERFLOW) {
            continue;
          }
          if (kind == StandardWatchEventKinds.ENTRY_CREATE) {
            WatchEvent<Path> watchEventPath = (WatchEvent<Path>) watchEvent;
            Path filename = watchEventPath.context();
            Path child = path.resolve(filename);
            if (Files.probeContentType(child).equals("image/jpeg")) {
              SimpleDateFormat dateFormat = new SimpleDateFormat(
                  "yyyy-MMM-dd HH:mm:ss");
              System.out.println("event: " + dateFormat.format(new Date()));
            } else {
              System.out.println("not an image");
              break OUTERMOST;
            }
          }
        }
        boolean valid = key.reset();
        if (!valid) {
          break;
        }
      }
    }
    watchService.close();
  }
}

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