给定一个指定的路径，遍历这个路径下的所有文件和文件夹，并分类。
删除3天前的文件和空文件夹。
package com.cknow.schedule.cronjobs; import com.cknow.beans.config.FileImageConfig; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; import java.io.File; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.Map; @Component @Configuration //1.主要用于标记配置类，兼备Component的效果。 @EnableScheduling // 2.开启定时任务 public class ScheduleTaskDeleteFiles { @Autowired private FileImageConfig fileImageConfig; /** * 定时删除临时文件夹下的文件 * <p> * {秒数} {分钟} {小时} {日期} {月份} {星期} {年份(可为空)} */ @Scheduled(cron = "5 * * * * ?") //5秒钟执行一次 private void deleteFileTasks() { //String tempPath = fileImageConfig.getImageTempFolder(); String tempPath = "D:\\cknow\\temp_dev"; ArrayList<File> fileList = new ArrayList<File>(); ArrayList<File> fileDirectoryList = new ArrayList<File>(); Map<String,ArrayList<File>> map = getFilesAndDirectory(fileList,fileDirectoryList,tempPath); ArrayList<File> fileListResult = map.get("fileList"); ArrayList<File> fileDirectoryListResult = map.get("fileDirectoryList"); System.out.println(fileListResult.size()); System.out.println(fileDirectoryListResult.size()); deleteFiles(fileListResult); deleteDirectory(fileDirectoryListResult); } /** * 方法getFilesAndDirectory根据指定路径获取所有的文件和文件夹 */ private Map<String,ArrayList<File>> getFilesAndDirectory(ArrayList<File> fileList, ArrayList<File> fileDirectoryList, String path) { try { //目标集合fileList File file = new File(path); if (file.isDirectory()) { File[] files = file.listFiles(); for (File fileIndex : files) { //如果这个文件是目录，则进行递归搜索 if (fileIndex.isDirectory()) { //fileDirectoryList.add(fileIndex);//由最外层到最内层，不利于删除 getFilesAndDirectory(fileList,fileDirectoryList,fileIndex.getPath()); fileDirectoryList.add(fileIndex);//由最内层到最外层 } else { //如果文件是普通文件，则将文件句柄放入集合中 fileList.add(fileIndex); } } } } catch (Exception e) { e.printStackTrace(); } Map<String,ArrayList<File>> map = new HashMap<>(); map.put("fileList",fileList);//文件集合 map.put("fileDirectoryList",fileDirectoryList);//文件夹集合 return map; } /** * 删除文件 * @param files */ private void deleteFiles(ArrayList<File> files){ if (files == null || files.size() == 0){ return; } Long currentTime = System.currentTimeMillis(); for (int i = 0; i < files.size(); i++) { File file = files.get(i); Long lastModified = file.lastModified(); System.out.print(lastModified); Date date = new Date(lastModified); System.out.print("\t"); System.out.print(date); System.out.print("\t"); Long cha = currentTime - lastModified; double result = cha * 1.0 /(1000*60*60); System.out.print("cha="+result); System.out.print("\t"); System.out.println("删除文件="+file.getPath()); if (result >= 72 ){//大于72小时，删除文件；就是删除3天前的文件 file.delete(); } } } /** * 删除文件夹 * @param directory */ private void deleteDirectory(ArrayList<File> directory){ if (directory == null || directory.size() == 0){ return; } for (int i = 0; i < directory.size(); i++) { File file = directory.get(i); if(file.isDirectory()){ if (file.list().length > 0){ System.out.println("目录下不为空，不删除"+file.getPath()); } else { System.out.println("目录下为空，删除"+file.getPath()); file.delete(); } } } } public static void main(String[] args) { new ScheduleTaskDeleteFiles().deleteFileTasks(); } }如果你觉得对你有帮助，请支持一下。☺
