Javascript判斷Crontab表達式是否合法
這段時間在做Quartz任務(wù)調(diào)度，使用的Crontab表達式實現(xiàn)的。Crontab由前端頁面輸入，作為參數(shù)穿入后臺。
雖然Quartz具有校驗Crontab表達式的方法，如下：
|
1
|
boolean cronExpressionFlag = CronExpression.isValidExpression(crontab); |
但是我一直想在前端直接驗證，即不需要通過異步的方式向后臺獲取驗證結(jié)果，找了好久，發(fā)現(xiàn)沒有現(xiàn)成的框架可以使用，于是自己根據(jù)網(wǎng)上搜索到的資料，寫了這個js腳本。
這個腳本目前對日和星期的判斷還有點小問題，不過不影響使用。
以后如果有時間，繼續(xù)完善這個腳本，廢話不多說了，上代碼：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
|
function cronValidate() { var cron = $("#cron").val(); var result = CronExpressionValidator.validateCronExpression(cron); if(result == true){ alert("格式正確"); } else{ alert("格式錯誤"); } return CronExpressionValidator.validateCronExpression(cron); } function CronExpressionValidator() { } CronExpressionValidator.validateCronExpression = function(value) { var results = true; if (value == null || value.length == 0) { return false; } // split and test length var expressionArray = value.split(" "); var len = expressionArray.length; if ((len != 6) && (len != 7)) { return false; } // check only one question mark var match = value.match(/\?/g); if (match != null && match.length > 1) { return false; } // check only one question mark var dayOfTheMonthWildcard = ""; // if appropriate length test parts // [0] Seconds 0-59 , - * / if (CronExpressionValidator.isNotWildCard(expressionArray[0], /[\*]/gi)) { if (!CronExpressionValidator.segmentValidator("([0-9\\\\,-\\/])", expressionArray[0], [0, 59], "seconds")) { return false; } } // [1] Minutes 0-59 , - * / if (CronExpressionValidator.isNotWildCard(expressionArray[1], /[\*]/gi)) { if (!CronExpressionValidator.segmentValidator("([0-9\\\\,-\\/])", expressionArray[1], [0, 59], "minutes")) { return false; } } // [2] Hours 0-23 , - * / if (CronExpressionValidator.isNotWildCard(expressionArray[2], /[\*]/gi)) { if (!CronExpressionValidator.segmentValidator("([0-9\\\\,-\\/])", expressionArray[2], [0, 23], "hours")) { return false; } } // [3] Day of month 1-31 , - * ? / L W C if (CronExpressionValidator.isNotWildCard(expressionArray[3], /[\*\?]/gi)) { if (!CronExpressionValidator.segmentValidator("([0-9LWC\\\\,-\\/])", expressionArray[3], [1, 31], "days of the month")) { return false; } } else { dayOfTheMonthWildcard = expressionArray[3]; } // [4] Month 1-12 or JAN-DEC , - * / if (CronExpressionValidator.isNotWildCard(expressionArray[4], /[\*]/gi)) { expressionArray[4] = CronExpressionValidator.convertMonthsToInteger(expressionArray[4]); if (!CronExpressionValidator.segmentValidator("([0-9\\\\,-\\/])", expressionArray[4], [1, 12], "months")) { return false; } } // [5] Day of week 1-7 or SUN-SAT , - * ? / L C # if (CronExpressionValidator.isNotWildCard(expressionArray[5], /[\*\?]/gi)) { expressionArray[5] = CronExpressionValidator.convertDaysToInteger(expressionArray[5]); if (!CronExpressionValidator.segmentValidator("([0-9LC#\\\\,-\\/])", expressionArray[5], [1, 7], "days of the week")) { return false; } } else { if (dayOfTheMonthWildcard == String(expressionArray[5])) { return false; } } // [6] Year empty or 1970-2099 , - * / if (len == 7) { if (CronExpressionValidator.isNotWildCard(expressionArray[6], /[\*]/gi)) { if (!CronExpressionValidator.segmentValidator("([0-9\\\\,-\\/])", expressionArray[6], [1970, 2099], "years")) { return false; } } } return true; } // ---------------------------------- // isNotWildcard 靜態(tài)方法; // ---------------------------------- CronExpressionValidator.isNotWildCard = function(value, expression) { var match = value.match(expression); return (match == null || match.length == 0) ? true : false; } // ---------------------------------- // convertDaysToInteger 靜態(tài)方法; // ---------------------------------- CronExpressionValidator.convertDaysToInteger = function(value) { var v = value; v = v.replace(/SUN/gi, "1"); v = v.replace(/MON/gi, "2"); v = v.replace(/TUE/gi, "3"); v = v.replace(/WED/gi, "4"); v = v.replace(/THU/gi, "5"); v = v.replace(/FRI/gi, "6"); v = v.replace(/SAT/gi, "7"); return v; } // ---------------------------------- // convertMonthsToInteger 靜態(tài)方法; // ---------------------------------- CronExpressionValidator.convertMonthsToInteger = function(value) { var v = value; v = v.replace(/JAN/gi, "1"); v = v.replace(/FEB/gi, "2"); v = v.replace(/MAR/gi, "3"); v = v.replace(/APR/gi, "4"); v = v.replace(/MAY/gi, "5"); v = v.replace(/JUN/gi, "6"); v = v.replace(/JUL/gi, "7"); v = v.replace(/AUG/gi, "8"); v = v.replace(/SEP/gi, "9"); v = v.replace(/OCT/gi, "10"); v = v.replace(/NOV/gi, "11"); v = v.replace(/DEC/gi, "12"); return v; } // ---------------------------------- // segmentValidator 靜態(tài)方法; // ---------------------------------- CronExpressionValidator.segmentValidator = function(expression, value, range, segmentName) { var v = value; var numbers = new Array(); // first, check for any improper segments var reg = new RegExp(expression, "gi"); if (!reg.test(v)) { return false; } // check duplicate types // check only one L var dupMatch = value.match(/L/gi); if (dupMatch != null && dupMatch.length > 1) { return false; } // look through the segments // break up segments on ',' // check for special cases L,W,C,/,#,- var split = v.split(","); var i = -1; var l = split.length; var match; while (++i < l) { // set vars var checkSegment = split[i]; var n; var pattern = /(\w*)/; match = pattern.exec(checkSegment); // if just number pattern = /(\w*)\-?\d+(\w*)/; match = pattern.exec(checkSegment); if (match && match[0] == checkSegment && checkSegment.indexOf("L") == -1 && checkSegment.indexOf("l") == -1 && checkSegment.indexOf("C") == -1 && checkSegment.indexOf("c") == -1 && checkSegment.indexOf("W") == -1 && checkSegment.indexOf("w") == -1 && checkSegment.indexOf("/") == -1 && (checkSegment.indexOf("-") == -1 || checkSegment .indexOf("-") == 0) && checkSegment.indexOf("#") == -1) { n = match[0]; if (n && !(isNaN(n))) numbers.push(n); else if (match[0] == "0") numbers.push(n); continue; } // includes L, C, or w pattern = /(\w*)L|C|W(\w*)/i; match = pattern.exec(checkSegment); if (match && match[0] != "" && (checkSegment.indexOf("L") > -1 || checkSegment.indexOf("l") > -1 || checkSegment.indexOf("C") > -1 || checkSegment.indexOf("c") > -1 || checkSegment.indexOf("W") > -1 || checkSegment .indexOf("w") > -1)) { // check just l or L if (checkSegment == "L" || checkSegment == "l") continue; pattern = /(\w*)\d+(l|c|w)?(\w*)/i; match = pattern.exec(checkSegment); // if something before or after if (!match || match[0] != checkSegment) { continue; } // get the number var numCheck = match[0]; numCheck = numCheck.replace(/(l|c|w)/ig, ""); n = Number(numCheck); if (n && !(isNaN(n))) numbers.push(n); else if (match[0] == "0") numbers.push(n); continue; } var numberSplit; // includes / if (checkSegment.indexOf("/") > -1) { // take first # numberSplit = checkSegment.split("/"); if (numberSplit.length != 2) { continue; } else { n = numberSplit[0]; if (n && !(isNaN(n))) numbers.push(n); else if (numberSplit[0] == "0") numbers.push(n); continue; } } // includes # if (checkSegment.indexOf("#") > -1) { // take first # numberSplit = checkSegment.split("#"); if (numberSplit.length != 2) { continue; } else { n = numberSplit[0]; if (n && !(isNaN(n))) numbers.push(n); else if (numberSplit[0] == "0") numbers.push(n); continue; } } // includes - if (checkSegment.indexOf("-") > 0) { // take both # numberSplit = checkSegment.split("-"); if (numberSplit.length != 2) { continue; } else if (Number(numberSplit[0]) > Number(numberSplit[1])) { continue; } else { n = numberSplit[0]; if (n && !(isNaN(n))) numbers.push(n); else if (numberSplit[0] == "0") numbers.push(n); n = numberSplit[1]; if (n && !(isNaN(n))) numbers.push(n); else if (numberSplit[1] == "0") numbers.push(n); continue; } } } // lastly, check that all the found numbers are in range i = -1; l = numbers.length; if (l == 0) return false; while (++i < l) { // alert(numbers[i]); if (numbers[i] < range[0] || numbers[i] > range[1]) { return false; } } return true; } |
感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
原文鏈接：http://blog.csdn.net/wangshuang1631/article/details/53012146
