java 文件锁的简单实现

java文件锁的功能，隐私文件及安全性的提升，实现起来不难，这里贴下实现代码：

实例代码：

import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.RandomAccessFile; import java.nio.channels.FileChannel; import java.nio.channels.FileLock; public class FileLocker { public static void main(String[] args) throws IOException { File f = new File("aaa.txt"); System.out.println(getFileContent(f) + 1);// no lock FileLock lock = getFileLock(f);// lock System.out.println(getFileContent(f) + 2); lock.release();// lock release System.out.println(getFileContent(f) + 3);// no lock } /** * get file content. * * @param file * @return */ public static String getFileContent(File file) { String line = ""; String content = ""; try { BufferedReader bf = new BufferedReader(new InputStreamReader( new FileInputStream(file))); while ((line = bf.readLine()) != null) { content += line; } } catch (FileNotFoundException e) { content = "ERROR "; } catch (IOException e) { content = "ERROR "; } return content; } /** * get lock. * * @param file * @return * @throws IOException */ public static FileLock getFileLock(File file) throws IOException { RandomAccessFile fi = new RandomAccessFile(file, "rw"); FileChannel fc = fi.getChannel(); return fc.tryLock(); } }

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