[java][nio]资料加锁

[java][nio]文件加锁

import java.io.FileOutputStream;import java.nio.channels.FileLock;import java.util.concurrent.TimeUnit;/** *  * 文件加锁. * */public class FileLocking {public static void main(String[] args) throws Exception {FileOutputStream fos = new FileOutputStream("D:\\temp.tmp");//tryLock是非阻塞式,未获得锁则直接返回//lock是阻塞式的.//tryLock(position, size, shared)可以部分锁定文件//FileLock.isShared查询共享锁或独占锁FileLock fl = fos.getChannel().tryLock();if(fl != null){System.out.println("Locked File");TimeUnit.MILLISECONDS.sleep(100);fl.release();System.out.println("Release Lock");}if(fos != null){fos.close();}}}