Watch Service 사용법 ( 1.7 버전 )

 자바 Watch Service

특정 디렉토리를 감지 하고 있다가 그


디렉토리에 이벤트 발생시 알려 준다.

 

import java.io.IOException;

import java.nio.file.FileSystems;

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;

 

public class WatchServiceTest {

final static Kind<Path> ENTRY_CREATE =


StandardWatchEventKinds.ENTRY_CREATE;

final static Kind<Path> ENTRY_DELETE =


StandardWatchEventKinds.ENTRY_DELETE;

final static Kind<Path> ENTRY_MODIFY =


StandardWatchEventKinds.ENTRY_MODIFY;

final static Kind<Object> OVERFLOW     =


StandardWatchEventKinds.OVERFLOW;

public static void main(String[] args) {

try {

WatchService watcher = FileSystems.getDefault()

.newWatchService();

Path dir = Paths.get("감시할 폴더 경로");

dir.register(watcher,ENTRY_CREATE,


ENTRY_DELETE,ENTRY_MODIFY,OVERFLOW);

while (true) {

    WatchKey key;

    try {

        // wait for a key to be available

        key = watcher.take();

    } catch (InterruptedException ex) {

        return;

    }

 

    for (WatchEvent<?> event : key.pollEvents()) {

        // get event type

        WatchEvent.Kind<?> kind = event.kind();

 

        // get file name

        @SuppressWarnings("unchecked")

        WatchEvent<Path> ev = (WatchEvent<Path>) event;

        Path fileName = ev.context();

       

        System.out.println(kind.name() + ": " + fileName+" 변경 감지..");

 

        if (kind == OVERFLOW) {

            continue;

        } else if (kind == ENTRY_CREATE) {

 

            // process create event

        System.out.println("Create...."+fileName.getFileName());

 

        } else if (kind == ENTRY_DELETE) {

 

            // process delete event

        System.out.println("Delete...."+fileName.getFileName());

 

        } else if (kind == ENTRY_MODIFY) {

 

            // process modify event

        System.out.println("Modify...."+fileName.getFileName());

 

        }

    }

 

    // IMPORTANT: The key must be reset after processed

    boolean valid = key.reset();

    if (!valid) {

        break;

    }

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}