证明一下Filelock是进程级别的

import java.io.File;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;


public class FileLockTest {
	static File file = new File("D:\\log6666666.txt");
	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		FileChannel channel = new FileOutputStream(file).getChannel();
		FileLock lock = channel.tryLock();
		String name = Thread.currentThread().getName();
		ByteBuffer sendBuffer=ByteBuffer.wrap((name+" 写入").getBytes("UTF-8"));
		channel.write(sendBuffer);
		Thread.sleep(30000);
		lock.release();
	}

}

当运行另一进程时：

Exception in thread "main" java.io.IOException: 另一个程序已锁定文件的一部分，进程无法访问。
	at sun.nio.ch.FileDispatcher.write0(Native Method)
	at sun.nio.ch.FileDispatcher.write(FileDispatcher.java:44)
	at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:104)
	at sun.nio.ch.IOUtil.write(IOUtil.java:75)
	at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:204)
	at FileLockTest.main(FileLockTest.java:20)