校验cron表达式是否有效

ruoyi-admin/src/main/java/com/ruoyi/web/controller/monitor/SysJobController.java

@@ -149,4 +149,14 @@ public class SysJobController extends BaseController
         job.setUpdateBy(ShiroUtils.getLoginName());
         return toAjax(jobService.updateJobCron(job));
     }
+    
+    /**
+     * 校验cron表达式是否有效
+     */
+    @PostMapping("/checkCronExpressionIsValid")
+    @ResponseBody
+    public boolean checkCronExpressionIsValid(SysJob job)
+    {
+        return jobService.checkCronExpressionIsValid(job.getCronExpression());
+    }
 }

ruoyi-admin/src/main/resources/templates/monitor/job/add.html

@@ -74,11 +74,26 @@
 				},
 				cronExpression:{
 					required:true,
+					remote: {
+	                    url: prefix + "/checkCronExpressionIsValid",
+	                    type: "post",
+	                    dataType: "json",
+	                    data: {
+	                        "cronExpression": function() {
+	                            return $.common.trim($("#cronExpression").val());
+	                        }
+	                    },
+	                    dataFilter: function(data, type) {
+	                    	return data;
+	                    }
+	                }
 				},
 			},
-			submitHandler:function(form){
+			messages: {
-				$.operate.save(prefix + "/add", $('#form-job-add').serialize());
+	            "cronExpression": {
-			}
+	                remote: "表达式不正确"
+	            }
+	        }
 		});
 		
 		function submitHandler() {

ruoyi-admin/src/main/resources/templates/monitor/job/edit.html

@@ -75,8 +75,26 @@
 				},
 				cronExpression:{
 					required:true,
+					remote: {
+	                    url: prefix + "/checkCronExpressionIsValid",
+	                    type: "post",
+	                    dataType: "json",
+	                    data: {
+	                        "cronExpression": function() {
+	                            return $.common.trim($("#cronExpression").val());
+	                        }
+	                    },
+	                    dataFilter: function(data, type) {
+	                    	return data;
+	                    }
+	                }
 				},
-			}
+			},
+			messages: {
+	            "cronExpression": {
+	                remote: "表达式不正确"
+	            }
+	        }
 		});
 		
 		function submitHandler() {

ruoyi-quartz/src/main/java/com/ruoyi/quartz/service/ISysJobService.java

@@ -89,4 +89,12 @@ public interface ISysJobService
      * @return 结果
      */
     public int updateJobCron(SysJob job);
+    
+    /**
+     * 校验cron表达式是否有效
+     * 
+     * @param cronExpression 表达式
+     * @return 结果
+     */
+    public boolean checkCronExpressionIsValid(String cronExpression);
 }

ruoyi-quartz/src/main/java/com/ruoyi/quartz/service/impl/SysJobServiceImpl.java

@@ -11,6 +11,7 @@ import com.ruoyi.common.support.Convert;
 import com.ruoyi.quartz.domain.SysJob;
 import com.ruoyi.quartz.mapper.SysJobMapper;
 import com.ruoyi.quartz.service.ISysJobService;
+import com.ruoyi.quartz.util.CronUtils;
 import com.ruoyi.quartz.util.ScheduleUtils;
 
 /**
@@ -204,4 +205,15 @@ public class SysJobServiceImpl implements ISysJobService
         }
         return rows;
     }
+    
+    /**
+     * 校验cron表达式是否有效
+     * 
+     * @param cronExpression 表达式
+     * @return 结果
+     */
+    public boolean checkCronExpressionIsValid(String cronExpression)
+    {
+        return CronUtils.isValid(cronExpression);
+    }   
 }

ruoyi-quartz/src/main/java/com/ruoyi/quartz/util/CronUtils.java

@@ -0,0 +1,63 @@
+package com.ruoyi.quartz.util;
+
+import java.text.ParseException;
+import java.util.Date;
+import org.quartz.CronExpression;
+
+/**
+ * cron表达式工具类
+ * 
+ * @author ruoyi
+ *
+ */
+public class CronUtils
+{
+    /**
+     * 返回一个布尔值代表一个给定的Cron表达式的有效性
+     *
+     * @param cronExpression Cron表达式
+     * @return boolean 表达式是否有效
+     */
+    public static boolean isValid(String cronExpression)
+    {
+        return CronExpression.isValidExpression(cronExpression);
+    }
+
+    /**
+     * 返回一个字符串值,表示该消息无效Cron表达式给出有效性
+     *
+     * @param cronExpression Cron表达式
+     * @return String 无效时返回表达式错误描述,如果有效返回null
+     */
+    public static String getInvalidMessage(String cronExpression)
+    {
+        try
+        {
+            new CronExpression(cronExpression);
+            return null;
+        }
+        catch (ParseException pe)
+        {
+            return pe.getMessage();
+        }
+    }
+
+    /**
+     * 返回下一个执行时间根据给定的Cron表达式
+     *
+     * @param cronExpression Cron表达式
+     * @return Date 下次Cron表达式执行时间
+     */
+    public static Date getNextExecution(String cronExpression)
+    {
+        try
+        {
+            CronExpression cron = new CronExpression(cronExpression);
+            return cron.getNextValidTimeAfter(new Date(System.currentTimeMillis()));
+        }
+        catch (ParseException e)
+        {
+            throw new IllegalArgumentException(e.getMessage());
+        }
+    }
+}