获得文件锁

//: c12:FileLocking.java// {Clean: file.txt}import java.io.FileOutputStream;import java.nio.channels.*;public class FileLocking {  public static void main(String[] args) throws Exception {    FileOutputStream fos= new FileOutputStream("file.txt");    FileLock fl = fos.getChannel().tryLock();    if(fl != null) {      System.out.println("Locked File");      Thread.sleep(100);      fl.release();      System.out.println("Released Lock");    }    fos.close();  }} ///:~