将定时任务cron 解析成中文

在使用定时器 quartz 时，其中的cron 表达式，老板表示作为开发的你能看懂外，其他的非开发同事可能看不懂，要用一个他们能看懂的方式表达出来。

还好我们的项目要求的表达式不是特别的麻烦，所以就写了一个简略的转换为中文的方法

package com.common.utils;
 
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
 
import org.quartz.CronExpression;
 
public class CronExpParser
{
    /**
     * 解析corn表达式，生成指定日期的时间序列
     * 
     * @param cronExpression cron表达式
     * @param cronDate cron解析日期
     * @param result crom解析时间序列
     * @return 解析成功失败
     */
    public static boolean parser(String cronExpression, String cronDate, List<String> result)
    {
        if (cronExpression == null || cronExpression.length() < 1 || cronDate == null || cronDate.length() < 1)
        {
            return false;
        }
        else
        {
            CronExpression exp = null;
            // 初始化cron表达式解析器
            try
            {
                exp = new CronExpression(cronExpression);
            }
            catch (ParseException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return false;
            }
             
            // 定义生成时间范围
            // 定义开始时间，前一天的23点59分59秒
            Calendar c = Calendar.getInstance();
            String sStart = cronDate + " 00:00:00";
            SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date dStart = null;
            try
            {
                dStart = sdf.parse(sStart);
            }
            catch (ParseException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
             
            c.setTime(dStart);
            c.add(Calendar.SECOND, -1);
            dStart = c.getTime();
             
            // 定义结束时间，当天的23点59分59秒
            c.add(Calendar.DATE, 1);
            Date dEnd = c.getTime();
             
            // 生成时间序列
            java.util.Date dd = dStart;
            dd = exp.getNextValidTimeAfter(dd);
            while ((dd.getTime() >= dStart.getTime()) && (dd.getTime() <= dEnd.getTime()))
            {
                result.add(sdf.format(dd));
                dd = exp.getNextValidTimeAfter(dd);
            }
            exp = null;
        }
        return true;
    }
     
    public static String translateToChinese(String cronExp)
    {
        if (cronExp == null || cronExp.length() < 1)
        {
            return "cron表达式为空";
        }
        CronExpression exp = null;
        // 初始化cron表达式解析器
        try
        {
            exp = new CronExpression(cronExp);
        }
        catch (ParseException e)
        {
            return "corn表达式不正确";
        }
        String[] tmpCorns = cronExp.split(" ");
        StringBuffer sBuffer = new StringBuffer();
        if(tmpCorns.length == 6)
        {
            //解析月
            if(!tmpCorns[4].equals("*"))
            {
                sBuffer.append(tmpCorns[4]).append("月");
            }
            else
            {
                sBuffer.append("每月");
            }
            //解析周
            if(!tmpCorns[5].equals("*") && !tmpCorns[5].equals("?"))
            {
                char[] tmpArray =  tmpCorns[5].toCharArray();
                for(char tmp:tmpArray)
                {                    
                    switch (tmp)
                    {
                        case '1':
                            sBuffer.append("星期天");
                            break;
                        case '2':
                            sBuffer.append("星期一");
                            break;
                        case '3':
                            sBuffer.append("星期二");
                            break;
                        case '4':
                            sBuffer.append("星期三");
                            break;
                        case '5':
                            sBuffer.append("星期四");
                            break;
                        case '6':
                            sBuffer.append("星期五");
                            break;
                        case '7':
                            sBuffer.append("星期六");
                            break;
                        case '-':
                            sBuffer.append("至");
                            break;
                        default:
                            sBuffer.append(tmp);
                            break;
                    }
                }
            }
             
            //解析日
            if(!tmpCorns[3].equals("?"))
            {
                if(!tmpCorns[3].equals("*"))
                {
                    sBuffer.append(tmpCorns[3]).append("日");
                }
                else
                {
                    sBuffer.append("每日");
                }
            }
             
            //解析时
            if(!tmpCorns[2].equals("*"))
            {
                sBuffer.append(tmpCorns[2]).append("时");
            }
            else
            {
                sBuffer.append("每时");
            }
             
            //解析分
            if(!tmpCorns[1].equals("*"))
            {
                sBuffer.append(tmpCorns[1]).append("分");
            }
            else
            {
                sBuffer.append("每分");
            }
             
            //解析秒
            if(!tmpCorns[0].equals("*"))
            {
                sBuffer.append(tmpCorns[0]).append("秒");
            }
            else
            {
                sBuffer.append("每秒");
            }
        }
         
        return sBuffer.toString();
         
    }
     
    //测试方法
    public static void main(String[] args)
    {
        String CRON_EXPRESSION = "0 0 3 * * ?";
        // 生成指定日期的CRON时间序列
        String CRON_DATE = "2016-04-26";
        System.out.println(CRON_EXPRESSION);
        System.out.println(CronExpParser.translateToChinese(CRON_EXPRESSION));
         
        List<String> lTime = new ArrayList<String>();
        if(!CronExpParser.parser(CRON_EXPRESSION, CRON_DATE, lTime)){
         System.out.println("无法生成Cron表达式：日期,"+CRON_DATE+";不符合规则cron表达式："+CRON_EXPRESSION);
        }
        for(int i=0;i<lTime.size();i++){
         System.out.println(lTime.get(i));
        }
 
    }
}

执行结果：

0 0 3 * * ?
每月每日3时0分0秒
2016-04-26 03:00:00

　　老板说界面也不能直接让她们写表达式，最好是能有直观的感受去选，

于是我设计的界面如下：可以手动修改执行时间，或者可以使用cron表达式界面去修改，执行日期修改时描述信息也将修改

<tr><td align="right">
执行时间：
</td>
<td>
<input id="cron" class="tr180 td26" value="" name="cron" type="text" onchange="checkCron();"><img src="./images/form/clock.gif" onclick="openCron()">
<div >说明：设置定时器调度的时程表格式 <b>秒</b>(0-59,*) <b>分</b>(0-59,*) <b>时</b>(0-23,*) <b>日</b>(0-31,*,?) <b>月</b>(0-11) <b>周</b>(1-7,*,? 1=SUN) /指数值的增量<br>示例① 0 0 12 * * ? 例② 0 15,16 10 15 * ? 例③ 0 15 10 ? * 2-6</div>

</td>
</tr>
<tr>
<td align="right">
执行时间描述：
</td>
<td>
<div id="cronDesc"></div>
</td>
</tr>

用一个 onchange 方法，调用一个 ajax 就可以实现描述的更新啦

function checkCron()
{
    var datas={
        "cronExp":$("#cron").val()
        }; 
    $.ajax({
        type: "post",
        url: "/getCronDesc",
        data: datas,
        datatype: "text",
        success:function(data){ //成功的处理函数
                $("#cronDesc").html(data);
        }
    });
}

　　而 Cron 表达式的页面效果，找了好久，终于看到想看的东西了。感谢网友的无私分享，在他的基础之上，我经过修改改成自己需要的了，效果如下。

打开一个新的页面

openWin("../../static/cron/cronindex.htm", 640, 480);
 
function openWin(url,width,height)
{
    var newwin = window.open(url,"_blank","scrollbars=yes,resizable=yes,toolbar=no,location=no,directories=no,status=no,menubar=no,top=50,left=120,width="+width+",height="+height);
}

在打开的页面上选中值后，关闭子页面，并给父页面的某个表单赋值，调用父页面的某个js 方法

function selCron() {
//获取选中的选择框的值
    var cron = $("#cron").val();
    window.opener.cron.value=cron;
    window.close();
    window.opener.checkCron();
}

（ps: 居然不知道附件怎么上传,算了，corn 页面我就不写了，自己去找吧）

posted on 2020-04-30 16:37 J'KYO 阅读(4201) 评论(0) 编辑收藏举报