how to create new directory everyday having its name as current date

Question

Date dir = new java.util.Date(System.currentTimeMillis());
String baseDir = "/home/gaurav/usr/logs/ESBegin/";
String newDir = createDateBasedDirectory(baseDir, dir);

Logger logger = Logger.getLogger("MyLog1");  
FileHandler fh;  

try {  

    // This block configure the logger with handler and formatter  
    fh = new FileHandler(newDir+"/data.log");  
    logger.addHandler(fh);
    SimpleFormatter formatter = new SimpleFormatter();  
    fh.setFormatter(formatter);  

    // the following statement is used to log any messages  
    logger.info(stringifiedJson);  

} catch (SecurityException e) {  
    e.printStackTrace();  
} catch (IOException e) {  
    e.printStackTrace();  
}  

this will create a folder of todays date but i want to create new folder for everyday and store the log file in new folder....means everyday's folder must have that day's log file i have following method to create a folder

 public static String createDateBasedDirectory(String baseDirectory, Date argDate) {
        String newDir = null;

        if (baseDirectory != null && argDate != null) {
            try {
                String format = "yyyy-MM-dd";
                DateFormat dateFormatter = new SimpleDateFormat(format);
                String date = dateFormatter.format(argDate);
                File f = new File(baseDirectory);
                File files[] = f.listFiles();
                String dir = null;
                int baseDirLength = baseDirectory.length();
                int checkingLength = baseDirLength + format.length() + 3;

                int maxSeqNo = 0;

                for (int i = 0; i < files.length; i++) {
                    if (files[i].isDirectory()) {
                        dir = files[i].toString();
                        if (dir.length() == checkingLength) {
                            String existingDirDate = dir.substring(baseDirLength, baseDirLength + 10);

                            if (date.equalsIgnoreCase(existingDirDate)) {
                                int dirSeqNo = 
                                    Integer.parseInt(dir.substring(baseDirLength + 11, baseDirLength + 10 + 3));

                                if (dirSeqNo > maxSeqNo) {
                                    maxSeqNo = dirSeqNo;
                                }
                            }
                        }
                    }
                }

                String currSeq = "" + (maxSeqNo + 1);
                if (currSeq.length() == 1) {
                    currSeq = "0" + currSeq;
                }

                newDir = baseDirectory + date;
                new File(newDir).mkdir();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return newDir;
    }

what should i change if in want to create a new folder everyday

Answer 1

You can use the functionality of your logging framework to do so. For example use Log4J's RollingFileAppender.

You can use the fileName parameter to create new directories. From the documentation:

fileName: The name of the file to write to. If the file, or any of its parent directories, do not exist, they will be created.

Answer 2

Check if the directory for the current day exists, then create it if it doesn't exist or simply return it if it does exist.

/*
 * to make sure everyone knows what's going on 
 * name this method like getOrCreateDailyLogDirectory
 */
public static String createDateBasedDirectory(String baseDirectory, Date argDate) {
    String newDir = null;

    if (baseDirectory != null && argDate != null) {
        try {
            String format = "yyyy-MM-dd";
            DateFormat dateFormatter = new SimpleDateFormat(format);
            String date = dateFormatter.format(argDate);
            // check if the directory exists:
            String todaysLogDir = baseDirectory + "\\" + date; // create the path as String
            // then create a Path (java.nio, alternatives possible)
            Path todaysDirectoryPath = Paths.get(todaysLogDir);
            // and check if this Path exists
            if (Files.exists(todaysDirectoryPath) {
                // if present, just return it in order to write (into) a log file there
                return todaysDirectoryPath.toUri().toString();
            } else {
                // create it the way you want and return the path as String
                ...
            }
            ...
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return newDir;
}

Doing it this (or a similar) way always returns the directory for the current day and creates it before once a day on first log attempt.