java - 下面的java代码是否保证对Windows中未打开的文件进行独占锁定？

Question

以下 Java 代码是否能保证 Windows 中未打开文件的独占锁定？

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {
    public static void main(String[] args) {
        File file = new File("mylog.log");
        try {
            FileOutputStream fos = new FileOutputStream(file);
            fos.getChannel().lock();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 1

正如 Java 规范中所示:

File locks are held on behalf of the entire Java virtual machine. They are not suitable for controlling access to a file by multiple threads within the same virtual machine.

所以如果您需要线程独占锁，请选择其他方式。