java生成cron表达式

 

/** 
 * @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
 * @author 
 * @date 
 * 
 */  
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));
    	
	}
}

 

 TaskScheduleModel:

 

public class TaskScheduleModel {
	
	
	/**
        * 所选作业类型: 
        * 1  -> 每天 
        * 2  -> 每月 
        * 3  -> 每周
        */
	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;	

	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;
	}
	
	
}