Crontab 中文表达式解析

package com.ninetech.cloud.bw.rpa.util;
import org.springframework.scheduling.support.CronSequenceGenerator;
import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;
/** * crontab 工具类 */public class CrontabUtils {
    /**     * 需要展示的表达式时间条数     */    private final static int size = 10;    private static final String common = "*";    private static final String questionMark = "?";    private static final String hyphen = "-";    private static final String slash = "/";    private static final String comma = ",";    private static final String second = "秒";    private static final String minute = "分";    private static final String hour = "时";    private static final String day = "日";    private static final String week = "周";    private static final String month = "月";
    public static String parse(String crontab) {        try {            StringBuilder result = new StringBuilder("表达式：").append(crontab).append("\n");            result.append(translateToChinese(crontab)).append("\n");            result.append("\n").append("表达式执行时间列表示例：").append("\n");            for (String exampleTime : examples(crontab)) {                result.append(exampleTime).append("\n");            }            return result.toString();        } catch (Exception e) {            return "无Crontab表达式";        }    }
    private static List<String> examples(String crontab) {        final CronSequenceGenerator generator = new CronSequenceGenerator(crontab);        Date date = new Date();        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        List<String> res = new ArrayList<>(size);        for (int i = 0; i < size; i++) {            date = generator.next(date);            res.add(sdf.format(date));        }        return res;    }
    public static String translateToChinese(String cronExp) {        String[] tmpCorns = cronExp.split(" ");        StringBuffer sBuffer = new StringBuffer();        if (tmpCorns.length != 6) {            throw new RuntimeException("请补全表达式,必须标准的cron表达式才能解析");        }        // 解析月        descMonth(tmpCorns[4], sBuffer);        // 解析周        descWeek(tmpCorns[5], sBuffer);        // 解析日        descDay(tmpCorns[3], sBuffer);        // 解析时        descHour(tmpCorns[2], sBuffer);        // 解析分        descMinute(tmpCorns[1], sBuffer);        // 解析秒        descSecond(tmpCorns[0], sBuffer);        return sBuffer.toString();    }
    private static void descSecond(String s, StringBuffer sBuffer) {        desc(s, sBuffer, second);    }
    private static void descMinute(String s, StringBuffer sBuffer) {        desc(s, sBuffer, minute);    }
    private static void descHour(String s, StringBuffer sBuffer) {        desc(s, sBuffer, hour);    }
    private static void descDay(String s, StringBuffer sBuffer) {        desc(s, sBuffer, day);    }
    private static void descWeek(String s, StringBuffer sBuffer) {        desc(s, sBuffer, week);    }
    private static void descMonth(String s, StringBuffer sBuffer) {        desc(s, sBuffer, month);    }
    private static void desc(String s, StringBuffer sBuffer, String flag) {        if (s.equals("1/1")) {            s="*";        }        if (s.equals("0/0")) {            s="0";        }        if (common.equals(s)) {            if (flag.equals(week)) {                sBuffer.append("每").append(turnWeek(s));            } else {                sBuffer.append("每").append(flag);            }            return;        }        if (questionMark.equals(s)) {            return ;        }        if (s.contains(comma)) {            String[] arr = s.split(comma);            for (String value : arr) {                if (value.length() != 0) {                    if (flag.equals(week)) {                        sBuffer.append(turnWeek(value)).append("和");                    } else {                        sBuffer.append("第").append(value).append(flag).append("和");                    }                }            }            sBuffer.deleteCharAt(sBuffer.length()-1);            sBuffer.append("的");            return;        }
        if (s.contains(hyphen)) {            String[] arr = s.split(hyphen);            if (arr.length!=2) {                throw new RuntimeException("表达式错误"+s);            }            if (flag.equals(week)) {                sBuffer.append(turnWeek(arr[0])).append(turnWeek(arr[1]));            } else {                sBuffer.append("从第").append(arr[0]).append(flag).append("到第").append(arr[1]).append(flag);            }            return;        }
        if (s.contains(slash)) {            String[] arr = s.split(slash);            if (arr.length!=2) {                throw new RuntimeException("表达式错误"+s);            }            if (arr[0].equals(arr[1])||arr[0].equals("0")) {                sBuffer.append("每").append(arr[1]).append(flag);            }else {                sBuffer.append("每").append(arr[1]).append(flag).append("的第").append(arr[0]).append(flag);            }            return;        }
        if (flag.equals(week)) {            sBuffer.append("每").append(turnWeek(s));        } else {            sBuffer.append("第").append(s).append(flag);        }    }
    private static String turnWeek(String week){        switch (week) {        case "0":            return"周天";        case "1":            return"周一";        case "2":            return"周二";        case "3":            return"周三";        case "4":            return"周四";        case "5":            return"周五";        case "6":            return"周六";        case "7":            return"周日";        default:            return null;        }    }
    public static void main(String[] args) {        for (String s : parse("0/10 3/5 1-3 * 1 0").split("\n")) {            System.out.println(s);        }    }}

表达式：0/10 3/5 1-3 * 1 0第1月每周天每日从第1时到第3时每5分的第3分每10秒
表达式执行时间列表示例：2022-01-02 01:03:002022-01-02 01:03:102022-01-02 01:03:202022-01-02 01:03:302022-01-02 01:03:402022-01-02 01:03:502022-01-02 01:08:002022-01-02 01:08:102022-01-02 01:08:202022-01-02 01:08:30