JAVA File Lock

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package fileLock;import java.io.File;import java.io.RandomAccessFile;import java.util.Collection;import java.util.Iterator;import java.util.concurrent.Callable;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import org.apache.commons.io.FileUtils;import org.apache.commons.io.IOUtils;/** * @ClassName: FileLock * @Description: TODO * @author Zhou Shengshuai * @date 2014年9月22日 下午2:03:04 *  */public class FileLock {private ExecutorService threadPool = null;private Collection<File> files = null;public void initial() {threadPool = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());files = FileUtils.listFiles(new File("lock"), new String[] { "lck", "LCK" }, false);}public void execute() {Iterator<File> iterator = files.iterator();while (iterator.hasNext()) {File file = iterator.next();ThreadTask threadTask = new ThreadTask(file);threadPool.submit(threadTask);}}public void destroy() {threadPool.shutdown();while (!threadPool.isTerminated());}public static void main(String[] args) {FileLock fileLock = new FileLock();fileLock.initial();fileLock.execute();fileLock.destroy();}}class ThreadTask implements Callable<File> {private File file = null;public ThreadTask(File file) {this.file = file;}@Overridepublic File call() throws Exception {if (file == null || !file.isFile()) {throw new Exception("File is null or non-file");}RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rws");java.nio.channels.FileLock fileLock = null;while (true) {fileLock = randomAccessFile.getChannel().tryLock();if (fileLock != null) {break;}}randomAccessFile.writeBytes("123\n");if (fileLock != null) {fileLock.release();}IOUtils.closeQuietly(randomAccessFile);return file;}}
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