cron generate utils

最新推荐文章于 2024-06-14 10:43:27 发布
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#java
该博客介绍了两个Cron表达式工具类的实现，用于构建和描述定时任务的Cron表达式。CronUtil类支持三种常用表达式，而CronUtil02类则根据TaskScheduleModel构建更复杂的表达式。通过示例展示了如何配置每日、每周和每月执行的任务，并生成对应的Cron表达式和详细描述。

I:
/**
 * @ClassName: CronUtil
 * @Description: Cron表达式工具类 目前支持三种常用的cron表达式
 * @author
 * @date
 *
 */
public class CronUtil {

    /**
     *
     * 方法摘要：构建Cron表达式
     *
     * @param rate  频率 0秒；1分；2小时；3日；4月
     * @param cycle 周期
     * @return String
     */
    public static String createLoopCronExpression(int rate, int cycle) {
        String cron = "";
        switch (rate) {
            case 0:// 每cycle秒执行一次
                cron = "0/" + cycle + " * * * * ?";
                break;
            case 1:// 每cycle分钟执行一次
                cron = "0 0/" + cycle + " * * * ?";
                break;
            case 2:// 每cycle小时执行一次
                cron = "0 0 0/" + cycle + " * * ?";
                break;
            case 3:// 每cycle天的0点执行一次
                cron = "0 0 0 1/" + cycle + " * ?";
                break;
            case 4:// 每cycle月的1号0点执行一次
                cron = "0 0 0 1 1/" + cycle + " ? ";
                break;
            case 5://  每天cycle点执行一次
                cron = "0 0 " + cycle+ "  * * ?";
                break;
            default:// 默认每cycle秒执行一次
                cron = "0/1 * * * * ?";
                break;
        }
        return cron;
    }
    /**
     *
     * 方法摘要：构建Cron描述
     *
     * @param rate  频率 0秒；1分；2小时；3日；4月
     * @param cycle 周期
     * @return String
     */
    public static String createLoopCronDescription(int rate, int cycle) {
        String desc = "";
        switch (rate) {
            case 0:// 每cycle秒执行一次
                desc = "每隔" + cycle + "秒触发一次任务";
                break;
            case 1:// 每cycle分钟执行一次
                desc = "每隔" + cycle + "分钟触发一次任务";
                break;
            case 2:// 每cycle小时执行一次
                desc = "每隔" + cycle + "小时触发一次任务";
                break;
            case 3:// 每cycle天的0点执行一次
                desc = "每隔" + cycle + "天的0点触发一次任务";
                break;
            case 4:// 每cycle月的1号0点执行一次
                desc = "每隔" + cycle + "月的1日0点触发一次任务";
                break;
            case 5:// 每天cycle点执行一次
                desc = "每天" + cycle + "点执行一次任务";
                break;
            default:// 默认每cycle秒执行一次
                desc = "每隔" + cycle + "秒触发一次任务";
                break;
        }
        return desc;
    }

    public static void main(String[] args) {

        System.out.println(CronUtil.createLoopCronExpression(4, 1));
        System.out.println(CronUtil.createLoopCronDescription(4, 1));

    }
}



=====================
II:


/** @ClassName: CronUtil
 * @Description: Cron表达式工具类
 * @author
 * @date
 *
 */
public class CronUtil02 {

    /**
     *
     *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();
    }

    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 = 1; //时 
        Integer minute = 32; //分 
        Integer second = 45; //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] = 22;
        dayOfMonths[2] = 12;
        taskScheduleModel.setDayOfMonths(dayOfMonths);
        cropExp = createCronExpression(taskScheduleModel);
        System.out.println(cropExp + "  : " + createDescription(taskScheduleModel));

        System.out.println("================");
        taskScheduleModel = new TaskScheduleModel();
        taskScheduleModel.setJobType(1);//按每天
        hour = 1; //时
        minute = 45; //分
        second = 0;
        taskScheduleModel.setHour(hour);
        taskScheduleModel.setMinute(minute);
        taskScheduleModel.setSecond(second);
        cropExp = createCronExpression(taskScheduleModel);
        System.out.println(cropExp + "  : " + createDescription(taskScheduleModel));

    }
} 

package cron;

import lombok.Data;

/**
 * @Description:
 * @param:
 * @Return:
 * @Throws:
 * @Author:
 * @Date: 2022/4/1 15:51
 */
@Data
public class TaskScheduleModel {
    /**
     * 所选作业类型:
     * 1  -> 每天
     * 2  -> 每月
     * 3  -> 每周
     * 4  ->间隔（每隔2个小时，每隔30分钟）
     */
    Integer jobType;

    /**一周的哪几天*/
    Integer[] dayOfWeeks;

    /**一个月的哪几天*/
    Integer[] dayOfMonths;

    /**秒  */
    Integer second;

    /**分  */
    Integer minute;

    /**时  */
    Integer hour;
}