import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
 
 
public class SaveLog {
 
	private final String logsFolder = "logs";
 
	public void writeInFile(String message) {
		FileWriter fichero;
		PrintWriter pw;
		try {
			checkFolderLogs(logsFolder);
			fichero = new FileWriter("logs/" + getDate() + ".txt", true);
			pw = new PrintWriter(fichero);
			pw.println(getHour() + message);
			pw.close();
			fichero.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	private String getDate() {
		Calendar c = Calendar.getInstance();
		return Integer.toString(c.get(Calendar.DATE)) + "-" + Integer.toString(c.get(Calendar.MONTH)) + "-" + Integer.toString(c.get(Calendar.YEAR));
	}
 
	private String getHour() {
		Calendar c = Calendar.getInstance();
		return "[" + c.get(Calendar.HOUR_OF_DAY) + ":" + c.get(Calendar.MINUTE) + ":" + c.get(Calendar.SECOND) + "] - ";
	}
 
	private void checkFolderLogs(String path) {
		File folder = new File(path);
		if(!folder.exists()){
			folder.mkdirs();
		}
	}
 
}
 
 

 
public class Main {
 
	public static void main(String[] args) {
		SaveLog saveLog = new SaveLog();
		saveLog.writeInFile("Este es un mensaje 1");
		saveLog.writeInFile("Este es un mensaje 2");
		saveLog.writeInFile("Este es un mensaje 3");
	}
 
}