лог в папку с датой 

			SimpleDateFormat out = new SimpleDateFormat("dd-MM-yyyy");
			String dateFolder = PropertyHandler.getInstance().getValue("LOGS_DIR")+File.separator +
					out.format(new Date());
			File f = new File(dateFolder);
			f.mkdir();
			String loggerPath = dateFolder+File.separator+ "log.log";

public class LogToFile {


    public static void main(String args[]) {
        try {
            PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("myfile.txt", true)));
            out.println("the text");
            out.close();


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