生成并解析cron表达式

        <dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.4.0</version></dependency><!--解析cron表达式--><dependency><groupId>org.quartz-scheduler</groupId><artifactId>quartz</artifactId><version>2.3.2</version></dependency>

import cn.hutool.core.date.DatePattern;
import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import org.quartz.CronExpression;
import java.text.ParseException;
import java.util.Arrays;
import java.util.Date;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.stream.Collectors;public class CronUtil {//获取quartz能解析的表达式public static String genCron(int type, String hour, String dayOfMon,String month, String dayOfWeek,String everydayOther,String monthlyOther) {String cron = "";switch (type) {case 0:// 每年month月的dayOfMonth号的hour点执行cron = "0 0 " + hour + " " + dayOfMon + " " + month + " ?";break;case 1:// 每月的dayOfMon号的hour点执行cron = "0 0 " + hour + " " + dayOfMon + " * ?";break;case 2:// 每周的dayOfWeek的hour时执行cron = "0 0 " + hour + " ? * " + dayOfWeek;break;case 3:// 每天的hour时执行cron = "0 0 " + hour + " ? * *";break;case 4:// 每隔几天的hour时执行cron = "0 0 " + hour + " */" + everydayOther + " * ?";break;case 5:// 每隔几月的dayOfMon号的hour点cron = "0 0 " + hour + " " + dayOfMon + " "+ monthlyOther + " ?";break;}return cron;}//获取Linux的执行表达式public static String genLinuxCron(int type, String hour, String dayOfMon,String month, String dayOfWeek,String everydayOther,String monthlyOther,String weeklyOther) {String cron = "";switch (type) {case 0:// 每年month月的dayOfMonth号的hour点执行cron = "00 " + hour + " " + dayOfMon + " " + month + " *";break;case 1:// 每月的dayOfMon号的hour点执行cron = "00 " + hour + " " + dayOfMon + " * *";break;case 2:// 每周的dayOfWeek的hour时执行cron = "00 " + hour + " * * " + getWeekly(dayOfWeek);break;case 3:// 每天的hour时执行cron = "00 " + hour + " * * *";break;case 4:// 每隔几天的hour时执行cron = "00 " + hour + " */" + everydayOther + " * *";break;case 5:// 每隔几月的dayOfMon号的hour点cron = "00 " + hour + " " + dayOfMon + " "+ monthlyOther + " *";break;case 6:// 每隔几周的dayOfWeek的hour时执行cron = weeklyOther + " 00 " + hour + " * * " + getWeekly(dayOfWeek);break;}return cron;}//获取周详细日期private static String getWeekly(String dayOfWeek){String[] split = dayOfWeek.split(StrUtil.COMMA);StringBuilder stringBuilder = new StringBuilder();Arrays.stream(split).map(x -> stringBuilder.append(Integer.parseInt(x) - 1).append(StrUtil.COMMA)).collect(Collectors.toList());return stringBuilder.substring(0,stringBuilder.length()-1);}//获取月份详情private static String getMonthly(String monthlyOther,String startTime){StringBuilder stringBuilder = new StringBuilder();int num = Integer.parseInt(monthlyOther);DateTime parse = DateUtil.parse(startTime);int startMonth = parse.month()+1;int month = parse.month()+1;stringBuilder.append(month).append(StrUtil.COMMA);for (int i = 0; ; i++) {month=month+num;if (month>12){month=month-12;if (month!=startMonth)stringBuilder.append(month).append(StrUtil.COMMA);if (month>=startMonth)break;month=month+12;}if (month<=12) stringBuilder.append(month).append(StrUtil.COMMA);}return stringBuilder.substring(0,stringBuilder.length()-1);}public static LinkedHashSet<String> getAllTheTimeInAYear(String cron,Date startTime){LinkedHashSet<String> set = new LinkedHashSet<>();try {CronExpression exp = new CronExpression(cron);Date oldTime = DateUtil.offsetMonth(startTime, -12).toJdkDate();DateTime dateTime = DateUtil.offsetMonth(startTime, 12);for (int i = 1;; i++) {oldTime = exp.getNextValidTimeAfter(oldTime);if (DateUtil.compare(oldTime,dateTime)>0) break;if (DateUtil.compare(oldTime,startTime)>0 || DateUtil.compare(oldTime,startTime)==0)set.add(DateUtil.format(oldTime,DateUtils.patternE));}} catch (ParseException e) {return null;}return set;}//每隔多少天public static LinkedHashSet<String> getAllTheTimeInAYearOfDay(Date startTime,String everydayOther){LinkedHashSet<String> set = new LinkedHashSet<>();if (DateUtil.compare(new Date(),startTime)<=0) set.add(DateUtil.format(startTime,DateUtils.patternE));DateTime dateTime = DateUtil.offsetMonth(startTime, 12);for (int i = 0; ; i++) {startTime = DateUtil.offsetDay(startTime, Integer.parseInt(everydayOther));if (DateUtil.compare(startTime,dateTime)>0) break;set.add(DateUtil.format(startTime,DateUtils.patternE));}return set;}//每隔多少周public static LinkedHashSet<String> getAllTheTimeInAYearOfWeekly(Date startTime,String weeklyOther,String weeklyDay){LinkedHashSet<String> set = new LinkedHashSet<>();HashSet<Integer> hashSet = new HashSet<>();DateTime oldTime = DateUtil.offsetMonth(startTime, -12);DateTime dateTime = DateUtil.offsetMonth(startTime, 12);String[] split = weeklyDay.split(StrUtil.COMMA);//2,3,4Arrays.stream(split).map(x->hashSet.add(Integer.parseInt(x))).collect(Collectors.toList());Integer integer = hashSet.stream().min(Integer::compare).get();for (int i = 0; ; i++) {oldTime = DateUtil.offsetDay(oldTime, 1);if (hashSet.contains(DateUtil.dayOfWeek(oldTime))){if (DateUtil.compare(oldTime,dateTime)>0) break;if (DateUtil.compare(oldTime,startTime)>=0) set.add(DateUtil.format(oldTime,DateUtils.patternE));}if (DateUtil.dayOfWeek(oldTime)== integer)oldTime = DateUtil.offsetWeek(oldTime, Integer.parseInt(weeklyOther)-1);}return set;}public static void main(String[] args) {HashSet<Integer> hashSet = new HashSet<>();hashSet.add(111);hashSet.add(21);hashSet.add(13);hashSet.add(12);hashSet.add(16);hashSet.add(31);Integer integer = hashSet.stream().max(Integer::compare).get();String[] split = "1,3,5,6".split(StrUtil.COMMA);StringBuilder stringBuilder = new StringBuilder();Arrays.stream(split).map(x -> stringBuilder.append(Integer.parseInt(x) - 1).append(StrUtil.COMMA)).collect(Collectors.toList());Arrays.stream(split).map(x->hashSet.add(Integer.parseInt(x))).collect(Collectors.toList());DateTime offsetWeek = DateUtil.offsetWeek(new Date(), 2);int dayOfWeek = DateUtil.dayOfWeek(new Date());System.out.println(getMonthly("2", "2020-03-25 14:00"));//生成String x = genCron(5, "10","1", "1", "1", "2", "2");System.out.println(x);//解析try {CronExpression exp = new CronExpression("0 0 2,4,5 2,25 */2 ? ");Date date = new Date();Date startDate = exp.getNextValidTimeAfter(date);
//            DateTime dateTime = DateUtil.offsetMonth(startDate, 12);for (int i = 1;i<10; i++) {startDate = exp.getNextValidTimeAfter(startDate);
//                if (DateUtil.compare(date,dateTime)>0)break;System.out.println(DateUtil.format(startDate, DatePattern.NORM_DATETIME_PATTERN));}} catch (ParseException e) {e.printStackTrace();}}
}

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