Eventer.java

package com.horitaku1124.java.event;

import java.io.IOException;
import java.nio.file.*;
import java.util.function.Consumer;

public class Eventer {
    public static void getEvent(String filPath, Consumer<Path> callback)  {
        try {
            Path filePath = Paths.get(filPath);

            String fileName = filePath.getFileName().toString();
            Path parentDir = filePath.getParent();
            System.out.println("FileName: " + fileName);
//            System.out.println("Parent: " + parentDir);
            WatchService watchService = FileSystems.getDefault().newWatchService();
            parentDir.register(watchService, StandardWatchEventKinds.ENTRY_CREATE,
                    StandardWatchEventKinds.ENTRY_DELETE,
                    StandardWatchEventKinds.ENTRY_MODIFY);

            WatchKey key = watchService.take();

            while (true) {
                for (WatchEvent<?> event : key.pollEvents()) {
                    WatchEvent.Kind<?> kind = event.kind();
                    Object context = event.context();
                    if (context instanceof Path) {
                        Path path = (Path)context;
                        String fileName2 = path.getFileName().toString();
//                        System.out.println(kind);
//                        System.out.println("kind "+ kind.type().getName());
//                        System.out.println(path.toAbsolutePath());
//                        System.out.println(path.getFileName());
                        if (fileName2.equals(fileName)) {
//                            System.out.println("catch");
                            callback.accept(path);
                        }
                    } else {
                        System.err.println("context error");
                        System.err.println(context);
                    }
                }
            }
        } catch (IOException | InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}