如何在文件上设置写锁定 [英] How to put write lock on file

问题描述

我在服务器上有文本文件.
用户可以对其进行读写.
我想在第一个用户进入并打开文件时在文件上放写锁，
如果另一个用户介于两者之间并打开文件，则他应该只读取该文件，不允许写入文件.

I have text file on server.
User can read it and write in it.
I want to put write lock on file when first user come and open it ,
If another user comes in between and open the file he should just read the file not allow to write in file.

推荐答案

最简单的方法:

使用自定义对象"FileWithLock"而不是"File".您只需在那一个上设置一个锁并做出反应即可.

simplest approach:

Use a custom object "FileWithLock" instead of "File". You can simply set a lock on that one and react.

import java.io.File;

public class FileWithLock extends File
{
    private boolean locked = false;
    public FileWithLock(String pathName){
    	super(pathName);
    }

    public void setLocked(boolean locked){
        this.locked = locked;
    }

    public boolean bisLocked(){
        return locked;
    }
}

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