在文件夹显示中，文件在过去15分钟内被修改/更新 [英] In a folder display the files was modified/updated on last 15 minutes

问题描述

您好，



我尝试让文件夹中的文件最近15分钟更新。

但我更新了文件最近在代码中。

任何人请帮助我。



我尝试过的事情：

Hello,

I try to get the files in the folder was updated last 15 minutes.
But am getting the files updated recently in code.
Any one please help me on this.

What I have tried:

File[] files = dir.listFiles();
File lastModifiedFile = files1[0];
for (int i = 1; i < files1.length; i++)
{
   if (lastModifiedFile.lastModified() < files[i].lastModified()) {
      lastModifiedFile = files[i];
      System.out.println(lastModifiedFile.getName());
   }
}

推荐答案

试试这个：

Try this:

long last15 = Instant.now().toEpochMilli(); // number of milliseconds since the epoch
last15 -= 15 * 60 * 1000; // less 15 minutes
File dir = new File(dirPath);
File[] files = dir.listFiles();
if (files == null || files.length == 0) 
{
    return null;
}
for (int i = 0; i < files.length; i++)
{
    if (files[i].lastModified() > last15)
    { 
        System.out.println(files[i]);
    }
}

lastModified 时间以毫秒为单位表示时代。所以你需要的只是当前时间和相同格式的差异。



15分钟它可能是

The lastModified time is represented in milliseconds since the epoch. So all you need is the current time and the difference in the same format.

For 15 minutes it could be

import java.time.Instant;
// ...
Instant timestamp = Instant.now();
long timeLimitMillis = instant.toEpochMilli() - (15 * 60 * 1000);
// ...
if (files[i].lastModified() >= timeLimitMillis) 
{
    // Has been modified during the last 15 minutes
}

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