利用Java NIO 实现文件监控功能。

利用java7提供的工具包实现文件的创建，修改，删除监控服务。

package com.news.feature;

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.WatchKey;
import java.nio.file.WatchService;


/**
 * @author Trancy
 * @since 2015/04/29
 * @功能描述 监控文件状态服务
 */
public class WatchFileService {


/**
* @author Trancy
* @throws IOException
* @throws InterruptedException
* @功能描述 監控文件创建
*/
public static void FileWatch(String filepath) throws IOException,
InterruptedException {


WatchService service = FileSystems.getDefault().newWatchService();
Path path = Paths.get(filepath).toAbsolutePath();


path.register(
service, StandardWatchEventKinds.ENTRY_CREATE,
StandardWatchEventKinds.ENTRY_MODIFY,
StandardWatchEventKinds.ENTRY_DELETE);


while (true) {
WatchKey key = service.take();
for (WatchEvent event : key.pollEvents()) {
System.out.println(event.kind().toString());


if (event.kind().equals(StandardWatchEventKinds.ENTRY_CREATE)) {


Path createdPath = (Path) event.context();
createdPath = path.resolve(createdPath);
long size = Files.size(createdPath);
System.out.println("创建文件：" + createdPath + "==>" + size);
} else if (event.kind().equals(StandardWatchEventKinds.ENTRY_MODIFY)) {


Path createdPath = (Path) event.context();
createdPath = path.resolve(createdPath);
long size = Files.size(createdPath);
System.out.println("修改文件：" + createdPath + "==>" + size);
} else if (event.kind().equals(StandardWatchEventKinds.ENTRY_DELETE)) {


Path createdPath = (Path) event.context();
createdPath = path.resolve(createdPath);
System.out.println("删除 文件：" + createdPath);
}


}
key.reset();
}
}


public static void main(String[] args) {
try {
FileWatch("D:/资料/MOBI");
} catch (IOException e) {


e.printStackTrace();
} catch (InterruptedException e) {


e.printStackTrace();
}
}
}