java生成Cron表达式

import java.util.Date;

public class TaskScheduleModel {


    /**
     * 所选作业类型:
     * 0  -> 某个时间点
     * 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;

    /**
     * 具体时间点
     */
    Date date;

    public Integer getJobType() {
        return jobType;
    }

    public void setJobType(Integer jobType) {
        this.jobType = jobType;
    }

    public Integer[] getDayOfWeeks() {
        return dayOfWeeks;
    }

    public void setDayOfWeeks(Integer[] dayOfWeeks) {
        this.dayOfWeeks = dayOfWeeks;
    }

    public Integer[] getDayOfMonths() {
        return dayOfMonths;
    }

    public void setDayOfMonths(Integer[] dayOfMonths) {
        this.dayOfMonths = dayOfMonths;
    }

    public Integer getSecond() {
        return second;
    }

    public void setSecond(Integer second) {
        this.second = second;
    }

    public Integer getMinute() {
        return minute;
    }

    public void setMinute(Integer minute) {
        this.minute = minute;
    }

    public Integer getHour() {
        return hour;
    }

    public void setHour(Integer hour) {
        this.hour = hour;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }
}

 

 

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author
 * @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
 * @date
 */
public class CronUtils {

    public 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;
    }

    /**
     * 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 {
            if (taskScheduleModel.getJobType().intValue() == 0 && taskScheduleModel.getDate() != null) {
                String dateFormat = "ss mm HH dd MM ? yyyy";
                SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
                if (taskScheduleModel.getDate() != null) {
                    cronExp.append(sdf.format(taskScheduleModel.getDate()));
                }
            } 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) {
        TaskScheduleModel taskScheduleModel = new TaskScheduleModel();
        taskScheduleModel.setJobType(0);//某个时间
        taskScheduleModel.setDate(new Date());
        System.out.println(createCronExpression(taskScheduleModel));
        //执行时间：每天的12时12分12秒 start
        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));

    }
}