指定时间生成cron表达式
简洁方式1：
public class CronUtils { private static final SimpleDateFormat sdf = new SimpleDateFormat("ss mm HH dd MM ? yyyy"); /*** * 功能描述：日期转换cron表达式 * @param date * @return */ public static String formatDateByPattern(Date date) { String formatTimeStr = null; if (Objects.nonNull(date)) { formatTimeStr = sdf.format(date); } return formatTimeStr; } /*** * convert Date to cron, eg "0 07 10 15 1 ? 2016" * @param date : 时间点 * @return */ public static String getCron(Date date) { return formatDateByPattern(date); } }
拆解方式2：
package com.gsafety.operationmanagement.utils; import java.text.SimpleDateFormat; import java.util.Date; /** * @ClassName: CronUtil * @Description: Cron表达式工具类 目前支持三种常用的cron表达式 1.每天的某个时间点执行 例:12 12 12 * * * ?表示每天12时12分12秒执行 2.每周的哪几天执行 例:12 12 12 ? * 1,2,3表示每周的周1周2周3 * ,12时12分12秒执行 3.每月的哪几天执行 例:12 12 12 1,21,13 * ?表示每月的1号21号13号 * 12时12分12秒执行 * */ public class CronUtil { /** * * 方法摘要：构建Cron表达式 * * @param taskScheduleModel * @return String */ public static String createCronExpression(TaskScheduleModel taskScheduleModel) { StringBuffer cronExp = new StringBuffer(""); if (null == taskScheduleModel.getJobType()) { System.out.println("执行周期未配置");// 执行周期未配置 } if (null != taskScheduleModel.getSecond() && null != taskScheduleModel.getMinute() && null != taskScheduleModel.getHour()) { // 秒 cronExp.append(taskScheduleModel.getSecond()).append(" "); // 分 cronExp.append(taskScheduleModel.getMinute()).append(" "); // 小时 cronExp.append(taskScheduleModel.getHour()).append(" "); // 每天 if (taskScheduleModel.getJobType().intValue() == 1) { cronExp.append("* ");// 日 cronExp.append("* ");// 月 cronExp.append("?");// 周 } // 按每周 else if (taskScheduleModel.getJobType().intValue() == 3) { // 一个月中第几天 cronExp.append("? "); // 月份 cronExp.append("* "); // 周 Integer[] weeks = taskScheduleModel.getDayOfWeeks(); for (int i = 0; i < weeks.length; i++) { if (i == 0) { cronExp.append(weeks[i]); } else { cronExp.append(",").append(weeks[i]); } } } // 按每月 else if (taskScheduleModel.getJobType().intValue() == 2) { // 一个月中的哪几天 Integer[] days = taskScheduleModel.getDayOfMonths(); for (int i = 0; i < days.length; i++) { if (i == 0) { cronExp.append(days[i]); } else { cronExp.append(",").append(days[i]); } } // 月份 cronExp.append(" * "); // 周 cronExp.append("?"); } } else { System.out.println("时或分或秒参数未配置");// 时或分或秒参数未配置 } return cronExp.toString(); } /** * * 方法摘要：生成计划的详细描述 * * @param taskScheduleModel * @return String */ public static String createDescription(TaskScheduleModel taskScheduleModel) { StringBuffer description = new StringBuffer(""); // 计划执行开始时间 // Date startTime = taskScheduleModel.getScheduleStartTime(); if (null != taskScheduleModel.getSecond() && null != taskScheduleModel.getMinute() && null != taskScheduleModel.getHour()) { // 按每天 if (taskScheduleModel.getJobType().intValue() == 1) { description.append("每天"); description.append(taskScheduleModel.getHour()).append("时"); description.append(taskScheduleModel.getMinute()).append("分"); description.append(taskScheduleModel.getSecond()).append("秒"); description.append("执行"); } // 按每周 else if (taskScheduleModel.getJobType().intValue() == 3) { if (taskScheduleModel.getDayOfWeeks() != null && taskScheduleModel.getDayOfWeeks().length > 0) { String days = ""; for (int i : taskScheduleModel.getDayOfWeeks()) { days += "周" + i; } description.append("每周的").append(days).append(" "); } if (null != taskScheduleModel.getSecond() && null != taskScheduleModel.getMinute() && null != taskScheduleModel.getHour()) { description.append(","); description.append(taskScheduleModel.getHour()).append("时"); description.append(taskScheduleModel.getMinute()).append("分"); description.append(taskScheduleModel.getSecond()).append("秒"); } description.append("执行"); } // 按每月 else if (taskScheduleModel.getJobType().intValue() == 2) { // 选择月份 if (taskScheduleModel.getDayOfMonths() != null && taskScheduleModel.getDayOfMonths().length > 0) { String days = ""; for (int i : taskScheduleModel.getDayOfMonths()) { days += i + "号"; } description.append("每月的").append(days).append(" "); } description.append(taskScheduleModel.getHour()).append("时"); description.append(taskScheduleModel.getMinute()).append("分"); description.append(taskScheduleModel.getSecond()).append("秒"); description.append("执行"); } } return description.toString(); } // 参考例子 public static void main(String[] args) { // 执行时间：每天的12时12分12秒 start TaskScheduleModel taskScheduleModel = new TaskScheduleModel(); taskScheduleModel.setJobType(1);// 按每天 Integer hour = 12; // 时 Integer minute = 12; // 分 Integer second = 12; // 秒 taskScheduleModel.setHour(hour); taskScheduleModel.setMinute(minute); taskScheduleModel.setSecond(second); String cropExp = createCronExpression(taskScheduleModel); System.out.println(cropExp + ":" + createDescription(taskScheduleModel)); // 执行时间：每天的12时12分12秒 end taskScheduleModel.setJobType(3);// 每周的哪几天执行 Integer[] dayOfWeeks = new Integer[3]; dayOfWeeks[0] = 1; dayOfWeeks[1] = 2; dayOfWeeks[2] = 3; taskScheduleModel.setDayOfWeeks(dayOfWeeks); cropExp = createCronExpression(taskScheduleModel); System.out.println(cropExp + ":" + createDescription(taskScheduleModel)); taskScheduleModel.setJobType(2);// 每月的哪几天执行 Integer[] dayOfMonths = new Integer[3]; dayOfMonths[0] = 1; dayOfMonths[1] = 21; dayOfMonths[2] = 13; taskScheduleModel.setDayOfMonths(dayOfMonths); cropExp = createCronExpression(taskScheduleModel); System.out.println(cropExp + ":" + createDescription(taskScheduleModel)); } /** * 通过输入指定日期时间生成cron表达式 * @param date * @return cron表达式 */ public static String getCron(Date date){ String dateFormat="ss mm HH dd MM ? yyyy"; SimpleDateFormat sdf = new SimpleDateFormat(dateFormat); String formatTimeStr = null; if (date != null) { formatTimeStr = sdf.format(date); } return formatTimeStr; } }
