Utilize AgeFileFilter to filter either newer files or files equal to or older

Scenario
I have an requirement to read a specific directory (including subdirectories) to find five days before log files and delete them.
How to do it?

How-To
Add commons-io to your maven dependency:

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<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency>

Here has code snippet:

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/** * 找出某個日期以前的檔案. * * @param directory 找出某個目錄下的檔案 * @param days 找出數天前 (如 -20) * @param includeSubdir 是否包含子目錄 (true / false) * @return List of File */ public static List<File> getFilesBeforeXDays(File directory, int days, Boolean includeSubdir) { Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); cal.add(Calendar.DATE, days); cal.set(Calendar.HOUR, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); cal.set(Calendar.MILLISECOND, 0); cal.set(Calendar.HOUR_OF_DAY, 0); Date date = cal.getTime(); IOFileFilter ageFileFilter = FileFilterUtils.ageFileFilter(date); IOFileFilter subDirFilter = includeSubdir ? FileFilterUtils.trueFileFilter() : FileFilterUtils.falseFileFilter(); Collection<File> fileCollection = org.apache.commons.io.FileUtils.listFiles(directory, ageFileFilter, subDirFilter); if(CollectionUtils.isEmpty(fileCollection)){ log.info("Cannot find any log files before " + new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS").format(date)); } else{ log.info("Find " + fileCollection.size() + " log file(s)."); } return new ArrayList<File>(fileCollection); }

Reference
[1] https://commons.apache.org/proper/commons-io/javadocs/api-2.4/org/apache/commons/io/filefilter/AgeFileFilter.html