java读取文件夹以及文件夹下的资源复制到另一个文件夹下

/**
     * @Description: 下载名为两个日期之间所有时间的文件夹下的图片
     * @Param: startDate:开始时间 endDate:结束时间
     * @return:
     * @Author: RenHuiBin
     * @Date: 2023/1/16 0016
     */

    @PostMapping("/downloadPictureMultiple")
    @ResponseBody
    public Result downloadPictureMultiple(String startTime, String endTime) {
        //1.查询两个日期间的所有图片文件夹(因存储时按照时间格式存储)
        String writeFilesPath = getFilePath2();//上传文件的路径
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        // 拿到的所有文件夹集合
        List<String> Timelist = new ArrayList<String>();
        try {
            // 转化成日期类型
            Date startDate = sdf.parse(startTime);
            Date endDate = sdf.parse(endTime);

            //用Calendar 进行日期比较判断
            Calendar calendar = Calendar.getInstance();
            while (startDate.getTime() <= endDate.getTime()) {
                // 把日期添加到集合
                Timelist.add(sdf.format(startDate));
                // 设置日期
                calendar.setTime(startDate);
                //把日期增加一天
                calendar.add(Calendar.DATE, 1);
                // 获取增加后的日期
                startDate = calendar.getTime();

            }
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
        //Timelist = 需要查询文件夹的日期们
        String path = "D:/JHTemp/qyyw"; //不带日期文件夹路径
        File file = new File(path);
        File[] files = file.listFiles();
        for (int i = 0; i < Timelist.size(); i++) {
            String writeFilesPaths = writeFilesPath + "/" + Timelist.get(i);//拼接写入文件的路径
            String readFilesPath = path + "/" + Timelist.get(i);//拼接读取文件的路径
            String[] readPathList = readFilesPath.split(",");
            String[] writePathList = writeFilesPaths.split(",");
            int length = 0;
            if (writePathList.length >= readPathList.length) {
                //验证1
                length = readPathList.length;
            } else if (writePathList.length < readPathList.length) {
                //验证2
                length = writePathList.length;
            }
            for (int l = 0; l < length; l++) {
                readAndWrite(readPathList[l], writePathList[l]);//调用内部方法读取,复制
            }
        }
        return Result.ok(writeFilesPath);

    }

/**
     * @Description: 读取文件夹文件复制到指定目录
     * @Param:read:读取目录 write输入目录
     * @return: String 返回异常字符串
     * @Author: RenHuiBin
     * @Date: 2023/1/16 0016
     */

    private static void readAndWrite(String read, String write) {
        System.out.println("读取文件START");
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        File file = new File(read);
        if (file.isDirectory()) {
            File[] filePathLists = file.listFiles();
            for (int i = 0; i < Objects.requireNonNull(filePathLists).length; i++) {
                if (filePathLists[i].isFile()) {
                    if (!new File(write).exists()) {
                        new File(write).mkdir();
//java中File类自带一个检测方法exists可以判断文件或文件夹是否存在，一般与mkdirs方法（该方法相较于mkdir可以创建包括父级路径，推荐使用该方法）或者createNewFile方法合作使用。
                        System.out.println("未获取到符合上传条件的文件目录,创建目录：" + new File(write).getName());
                    }
                    boolean upload = false;
                    try {
                        FileInputStream fis = new FileInputStream(filePathLists[i]);
                        FileOutputStream fos = new FileOutputStream(new File(write, filePathLists[i].getName()));
                        copy(fis, fos);
                        fis.close();//释放流输入
                        fos.close();//释放流输出
                        upload = true;
                    } catch (Exception e) {
                        e.printStackTrace();
                        System.out.println("上传文件异常");
                    }
                    if (upload) {
                        System.out.println("上传文件:" + filePathLists[i].getName() + "成功");
                    } else {
                        System.out.println("上传文件:" + filePathLists[i].getName() + "失败");
                    }

                }
            }
        } else {
            System.out.println("未获取到符合读取条件的文件目录");
        }
        stopWatch.stop();
        System.out.println("读取并上传文件END,耗时：{} S" + stopWatch.getTime());
    }

/**
     * @Description: 判断windows系统或者Linux系统的上传文件路径是否存在如果存在则返回路径
     * @Param: null
     * @return: 系统路径
     * @Author: RenHuiBin
     * @Date: 2023/1/16 0016
     */
    public static String getFilePath2() {
        String osName = System.getProperty("os.name");
        if (osName.startsWith("Linux")) {
            return "/jhkj/upload/qyyw_CheckAttendance";
        } else {
            File dir = new File("D:/JHTemp/qyyw_CheckAttendance");
            if (!dir.isDirectory()) {
                File dire = new File("E:/JHTemp/qyyw_CheckAttendance");
                if (!dire.isDirectory()) {
                    File dirf = new File("F:/JHTemp/qyyw_CheckAttendance");
                    if (!dirf.isDirectory()) {
                        File dirg = new File("G:/JHTemp/qyyw_CheckAttendance");
                        if (!dirg.isDirectory()) {
                            return "C:/JHTemp/qyyw_CheckAttendance";
                        } else {
                            return "G:/JHTemp/qyyw_CheckAttendance";
                        }
                    } else {
                        return "F:/JHTemp/qyyw_CheckAttendance";
                    }
                } else {
                    return "E:/JHTemp/qyyw_CheckAttendance";
                }
            } else {
                return "D:/JHTemp/qyyw_CheckAttendance";
            }
        }
    }

需求是点击页面按钮选择两个时间,获取电脑某个文件夹下的照片(图片存储在命名为时间的文件夹下)复制到另个一文件夹,有则复制,没有则创建