根据文件原始名称,文件根路径按照日期生成存储路径

背景

目前许多项目都要在本地生成文件，一般都要根据 文件的根目录和自定义的文件名称拼接出文件的绝对路径。下面提供一个工具方法供参考

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public class FileUtil {
    private static final DateFormat df = new SimpleDateFormat("yyyyMMdd");
    private static final DateFormat df1 = new SimpleDateFormat("HHmmss");

    //根据文件名称,文件根路径按照日期生成存储路径
    public static String generateFilePath(String fileName, String rootFolder) {
        if (StringUtils.isBlank(fileName) || StringUtils.isBlank(rootFolder)) {
            throw new RuntimeException("fileName and rootFolder cannot be null");
        }

        Date currentDate = new Date();
        Calendar c = Calendar.getInstance();
        c.setTime(currentDate);
        String fileSystemName = "";
        String uuid = UUID.randomUUID().toString().replaceAll("-", "");

        StringBuilder fileNameBuilder = new StringBuilder(fileName);
        fileSystemName = fileNameBuilder.insert(fileName.indexOf("."), "_" + uuid).insert(fileName.indexOf("."), "_" + df1.format(currentDate)).toString();
        StringBuffer filePath = new StringBuffer();
        filePath.append(rootFolder).append(File.separator).append(df.format(currentDate));
        File _folder = new File(filePath.toString());
        if (!_folder.exists()) {
            _folder.mkdir();
        }
        filePath.append(File.separator).append(c.get(Calendar.HOUR_OF_DAY));
        _folder = new File(filePath.toString());
        if (!_folder.exists()) {
            _folder.mkdir();
        }
        filePath.append(File.separator).append(fileSystemName);
        return filePath.toString();
    }

}

测试