Chaîne lisible par l'homme [fermée]
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22-07-2019 - |
Question
J'utilise Quartz avec Java pour planifier des travaux. Une chose est que je stocke des expressions cron sur une base de données et je voudrais les présenter à un utilisateur, mais sous une forme plus lisible. Je me demandais donc s'il existait un utilitaire capable de convertir une expression cron en chaîne lisible par l'homme. Quelque chose comme:
"0 30 10-13? * WED, FRI " va devenir "Incendies tous les mercredis et vendredis à 10h30, 11h30, 12h30 et 13h30."
La solution
Une bibliothèque Java qui convertit les expressions cron en chaînes lisibles par l'homme: https://github.com/RedHogs/cron-parser
Autres conseils
Eh bien oui, j'ai bien compris votre question. Mais j'aurais dû expliquer un peu mieux ma réponse.
Non, je ne connais aucun outil qui puisse vous aider à obtenir une expression cron sous une forme lisible par «l’humain». Mais en accédant à CronExpression, vous pouvez créer ce que vous possédez.
Essayez d'appeler
cronTrigger.getExpressionSummary()
sur l'expression du cron:
"0/2 * * 4 * ?"
il retourne la chaîne suivante:
seconds: 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58
minutes: *
hours: *
daysOfMonth: 4
months: *
daysOfWeek: ?
lastdayOfWeek: false
nearestWeekday: false
NthDayOfWeek: 0
lastdayOfMonth: false
calendardayOfWeek: false
calendardayOfMonth: false
years: *
En ayant accès à l'objet CronExpression, vous pouvez créer votre propre " humain " explenation.
cron-utils peut être utile pour cette tâche, car fournit des descriptions lisibles par l'homme et ne le permet pas. besoin d'un ordonnanceur à part entière pour les fournir. Est bien documenté et supporte plusieurs formats cron.
Ci-dessous un extrait de code de la documentation:
//create a descriptor for a specific Locale
CronDescriptor descriptor = CronDescriptor.instance(Locale.UK);
//parse some expression and ask descriptor for description
String description = descriptor.describe(parser.parse("*/45 * * * * *"));
//description will be: "every 45 seconds"
voici un que j'ai commencé. il utilise le langage que mes utilisateurs comprendront (probablement).
cela ne fonctionnera pas bien avec des mélanges de jetons comme '1,13,16-23, L' pour le jeton du jour au mois, mais j'espère que j'aurai du temps à y consacrer avant que mes utilisateurs ne deviennent aussi sophistiqués :
package com.tacteonltd.control.cron; import java.util.StringTokenizer; import com.tacteonltd.control.string.STRING; import com.tacteonltd.control.time.TIME; public class CRON { public static String humanReadable(String value){ StringBuffer sb = new StringBuffer(); try{ StringTokenizer tokens = new StringTokenizer(value, " ", false); humanizeSeconds(tokens.nextToken(), sb);sb.append("\n"); humanizeMinutes(tokens.nextToken(), sb);sb.append("\n"); humanizeHours(tokens.nextToken(), sb);sb.append("\n"); String dom = tokens.nextToken(); String month = tokens.nextToken(); String dow = tokens.nextToken(); humanizeDOMs(dom, dow, sb);sb.append("\n"); humanizeMonths(month, sb);sb.append("\n"); humanizeDOWs(dow, dom, sb); }catch(Throwable t){ t.printStackTrace(); } return sb.toString(); } private static void humanizeDOWs(String value, String dom, StringBuffer sb){ value=value.trim(); if(STRING.isNumeric(value)){ sb.append("and the " + value + postFix(value) + " day-of-the-week("+TIME.getWeekDayName(Integer.parseInt(value))+"). "); } else if(value.equals("*")) { sb.append("and every day-of-the-week. "); } else if(value.equals("?")) { sb.append("and whatever day-of-the-week it is for day"+(STRING.isNumeric(dom) ? "":"s")+"-of-the-month :"+(STRING.isNumeric(dom) ? dom:"that match"+(STRING.isNumeric(dom) ? "es":"")+" " + dom + ".")); } else if(value.indexOf("/")>-1){ String first = value.substring(0, value.indexOf("/")); String every = value.substring(value.indexOf("/") + 1); sb.append("and the " + first + postFix(first) + " day-of-the-week and every " + every + " day" + (Integer.parseInt(every) == 1 ? "":"s") + " following. "); } else if(value.indexOf(",")>-1){ StringTokenizer tokens = new StringTokenizer(value, ",", false); sb.append("and the following days of the week: "); int added = 0; while(tokens.hasMoreTokens()){ String token = tokens.nextToken(); sb.append((added==0 ? "":", ") + token);added++; } sb.append("."); } else if(value.indexOf("-")>-1){ StringTokenizer tokens = new StringTokenizer(value, "-", false); sb.append("and for every day of the week from " + tokens.nextToken() + " through " + tokens.nextToken() + ". "); } else { sb.append("and the following days of the week: " + value + "."); } } private static void humanizeMonths(String value, StringBuffer sb){ value=value.trim(); if(STRING.isNumeric(value)){ sb.append("the " + value + postFix(value) + " month("+TIME.getMonthName(Integer.parseInt(value))+"), "); } else if(value.equals("*")) { sb.append("every month, "); } else if(value.indexOf("/")>-1){ String first = value.substring(0, value.indexOf("/")); String every = value.substring(value.indexOf("/") + 1); sb.append("the " + first + postFix(first) + " month("+TIME.getMonthName(Integer.parseInt(value))+") and every " + every + " month" + (Integer.parseInt(every) == 1 ? "":"s") + " following, "); } else if(value.indexOf(",")>-1){ StringTokenizer tokens = new StringTokenizer(value, ",", false); sb.append("the following months: "); int added = 0; while(tokens.hasMoreTokens()){ sb.append((added==0 ? "":", ") + tokens.nextToken());added++; } } } private static void humanizeDOMs(String value, String dow, StringBuffer sb){ value=value.trim(); if(STRING.isNumeric(value)){ sb.append("the " + value + postFix(value) + " day-of-the-month, "); } else if(value.equals("*")) { sb.append("every day-of-the-month, "); } else if(value.equals("?")) { sb.append("whatever day-of-the-month falls upon " + dow + " , "); } else if(value.indexOf("-")>-1){ StringTokenizer tokens = new StringTokenizer(value, "-", false); String from = tokens.nextToken(); String through = tokens.nextToken(); int year = TIME.getYear(System.currentTimeMillis()); int month = TIME.getMonth(System.currentTimeMillis()); String last_dom = "" + TIME.getLastDOM(year, month); sb.append("for every day of the month from " + from + " through " + (through.equals("L") ? "the last("+year +"." +month + "."+last_dom+")":through) ); } else if(value.indexOf("/")>-1){ String first = value.substring(0, value.indexOf("/")); String every = value.substring(value.indexOf("/") + 1); sb.append("the " + first + postFix(first) + " day-of-the-month and every " + every + " day" + (Integer.parseInt(every) == 1 ? "":"s") + " following, "); } else if(value.indexOf(",")>-1){ StringTokenizer tokens = new StringTokenizer(value, ",", false); sb.append("the following days of the month: "); int added = 0; while(tokens.hasMoreTokens()){ String token = tokens.nextToken(); if(token.equals("L")){ int year = TIME.getYear(System.currentTimeMillis()); int month = TIME.getMonth(System.currentTimeMillis()); String last_dom = "" + TIME.getLastDOM(year, month); sb.append((added==0 ? "":", ") + "the last("+year +"." +month + "."+last_dom+")"); } else{ sb.append((added==0 ? "":", ") + token);added++; } } } } private static void humanizeSeconds(String value, StringBuffer sb){ value=value.trim(); if(STRING.isNumeric(value)){ sb.append("on the " + value + postFix(value) + " second, "); } else if(value.equals("*")) { sb.append("on every second, "); } else if(value.indexOf("/")>-1){ String first = value.substring(0, value.indexOf("/")); String every = value.substring(value.indexOf("/") + 1); sb.append("on the " + first + postFix(first) + " second and every " + every + " second" + (Integer.parseInt(every) == 1 ? "":"s") + " following, "); } else if(value.indexOf("-")>-1){ StringTokenizer tokens = new StringTokenizer(value, "-", false); sb.append("for every second from " + tokens.nextToken() + " through " + tokens.nextToken() + " "); } else if(value.indexOf(",")>-1){ StringTokenizer tokens = new StringTokenizer(value, ",", false); sb.append("on the following seconds: "); int added = 0; while(tokens.hasMoreTokens()){ sb.append((added==0 ? "":", ") + tokens.nextToken());added++; } } } private static void humanizeMinutes(String value, StringBuffer sb){ value=value.trim(); if(STRING.isNumeric(value)){ sb.append("the " + value + postFix(value) + " minute, "); } else if(value.equals("*")) { sb.append("every minute, "); } else if(value.indexOf("/")>-1){ String first = value.substring(0, value.indexOf("/")); String every = value.substring(value.indexOf("/") + 1); sb.append("the " + first + postFix(first) + " minute and every " + every + " minute" + (Integer.parseInt(every) == 1 ? "":"s") + " following, "); } else if(value.indexOf("-")>-1){ StringTokenizer tokens = new StringTokenizer(value, "-", false); sb.append("for every minute from " + tokens.nextToken() + " through " + tokens.nextToken() + " "); } else if(value.indexOf(",")>-1){ StringTokenizer tokens = new StringTokenizer(value, ",", false); sb.append("the following minutes: "); int added = 0; while(tokens.hasMoreTokens()){ sb.append((added==0 ? "":", ") + tokens.nextToken());added++; } } } private static void humanizeHours(String value, StringBuffer sb){ value=value.trim(); if(STRING.isNumeric(value)){ sb.append("the " + value + postFix(value) + " hour, "); } else if(value.equals("*")) { sb.append("every hour, "); } else if(value.indexOf("/")>-1){ String first = value.substring(0, value.indexOf("/")); String every = value.substring(value.indexOf("/") + 1); sb.append("the " + first + postFix(first) + " hour and every " + every + " hour" + (Integer.parseInt(every) == 1 ? "":"s") + " following, "); } else if(value.indexOf("-")>-1){ StringTokenizer tokens = new StringTokenizer(value, "-", false); sb.append("for every hour from " + tokens.nextToken() + " through " + tokens.nextToken() + " "); } else if(value.indexOf(",")>-1){ StringTokenizer tokens = new StringTokenizer(value, ",", false); sb.append("the following hours: "); int added = 0; while(tokens.hasMoreTokens()){ sb.append((added==0 ? "":", ") + tokens.nextToken());added++; } } } private static String postFix(String value){ String post = null; if(value.substring(value.length()-1).equals("1"))post = "st"; else if(value.substring(value.length()-1).equals("2"))post = "nd"; else if(value.substring(value.length()-1).equals("3"))post = "rd"; else post="th"; return post; } }
CronTrigger crée un objet CronExpression à partir de l'expression cron String. Mais vous ne pouvez pas y accéder. Mais en utilisant la réflexion, vous pouvez:
Class c = cronTrigger.getClass();
Field f = c.getDeclaredField("cronEx");
f.setAccessible(true);
CronExpression cronEx = (CronExpression) f.get(cronTrigger);