package com.crow;

import java.io.RandomAccessFile;

import java.nio.channels.FileChannel;

import java.nio.channels.FileLock;

/**

* Created by CrowHawk on 17/9/4.

*/

public class UseFileLocks {

static private final int start = 10;

static private final int end = 20;

public static void main(String[] args) throws Exception {//使用文件锁的示例

RandomAccessFile raf = new RandomAccessFile("ReadAndShow.txt", "rw");

FileChannel fc = raf.getChannel();

//Get Lock

System.out.println("Trying to get lock.");

FileLock lock = fc.lock(start, end, false);

System.out.println( "got lock!" );

// Pause

System.out.println( "pausing" );

try {

Thread.sleep( 3000 );

} catch( InterruptedException ie ) {

}

// Release lock

System.out.println( "going to release lock" );

lock.release();

System.out.println( "released lock" );

raf.close();

}

}