概述
在日常的开发中，我们难免会对日期格式化，对日期进行计算，对日期进行校验，为了避免重复写这些琐碎的逻辑，我这里封装了一个日期工具类，方便以后使用，直接复制代码到项目中即可使用。
日期工具类代码：
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 | import org.apache.commons.lang3.StringUtils;import java.lang.management.ManagementFactory;import java.text.ParseException;import java.text.SimpleDateFormat;import java.time.LocalDate;import java.time.LocalDateTime;import java.time.YearMonth;import java.time.ZoneId;import java.util.*;import java.util.regex.Pattern;/** * 常用日期工具类 * * @author compass * @date 2022/10/21 14:20 * @since 1.0.0 **/public class DateTools { public final static String DEFAULT_TIME_FORMAT = "HH:mm:ss"; public final static String DEFAULT_DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss"; public final static String DEFAULT_DATE_FORMAT_SHORT = "yyMMdd"; public final static String DEFAULT_YEAR_MODTH_SHORT = "yyyyMM"; public final static String DEFAULT_TIME_FORMAT_SHORT = "HHmmss"; public final static String DEFAULT_DATETIME_FORMAT_SHORT = "yyMMddHHmmss"; public final static String DEFAULT_DATE_FORMAT_ALLSHORT = "yyyyMMdd"; public static final String SIMPLE_DATE_STR = "yyyy-MM-dd"; public static final String FULL_DATE_STR = "yyyy-MM-dd HH:mm:ss"; public static final String ALL_FULL_DATE_STR = "yyyy-MM-dd HH:mm:ss.S"; public static final String PART_DATE_STR = "yyyy-MM-dd HH:mm"; public static final String DATEFORMAT_Y2H = "yyyy-MM-dd HH"; public static final String SIMPLE_RULE_DATE_STR = "yyyy/MM/dd"; public static final String FULL_RULE_DATE_STR = "yyyy/MM/dd HH:mm:ss"; public static final String PART_RULE_DATE_STR = "yyyy/MM/dd HH:mm"; public static final String SMALL_PART_RULE_DATE_STR = "HH:mm"; public static final String DATE_FORMAT_YYYYMMDD = "yyyyMMdd"; public static final String DATE_FORMAT_YYYYMMDDHH = "yyyyMMddHH"; public static final String DATE_FORMAT_YYYYMMDDHHMM = "yyyyMMddHHmm"; public static final String DATE_FORMAT_YYYYMMDDHHMMSS = "yyyyMMddHHmmss"; public static final String SIMPLE_POINT_DATE_STR = "yyyy.MM.dd"; public static final String FULL_POINT_DATE_STR = "yyyy.MM.dd HH:mm:ss"; /** * 锁对象 */ private static final Object lockObj = new Object(); /** * 存放不同格式的线程安全的SimpleDateFormat */ private static Map> sdfMap = new HashMap(); public enum DateType { YEAR("YEAR", 1), MONTH("MONTH", 2), DAY("DAY", 3), HOUR("HOUR", 4), MINUTE("MINUTE", 5), SECOND("SECOND", 6); private String name; private int value; DateType(String name, int value) { this.value = value; this.name = name; } public int getValue() { return value; } public String getName() { return name; } } /** * 返回一个ThreadLocal的sdf,每个线程只会new一次sdf * * @param pattern * @return */ private static SimpleDateFormat getSdf(final String pattern) { ThreadLocal tl = sdfMap.get(pattern); if (tl == null) { synchronized (lockObj) { tl = sdfMap.get(pattern); if (tl == null) { tl = ThreadLocal.withInitial(() -> new SimpleDateFormat(pattern)); sdfMap.put(pattern, tl); } } } return tl.get(); } private static String[] supportFmt = new String[]{ALL_FULL_DATE_STR, SIMPLE_DATE_STR,DATE_FORMAT_YYYYMMDDHHMMSS, DEFAULT_YEAR_MODTH_SHORT, DEFAULT_TIME_FORMAT, DEFAULT_DATE_FORMAT_SHORT}; private static String checkFmt(String datestr) { if (datestr == null) return null; int len = datestr.length(); if (len == 0) return null; String fmt; switch (len) { case 19: fmt = supportFmt[0]; break; case 10: fmt = supportFmt[1]; break; case 14: fmt = supportFmt[2]; break; case 6: fmt = supportFmt[3]; break; case 8: { if (datestr.indexOf(":") > 0) { fmt = supportFmt[4]; } else { fmt = supportFmt[5]; } } break; default: return null; } return fmt; } /** * 日期格式，正则表达式 */ private static String[] supportFmtPattern = new String[]{ "\d{4}\-\d{1,2}\-\d{1,2}", "yyyy-MM-dd", "\d{4}-\d{1,2}-\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2}", "yyyy-MM-dd HH:mm:ss", "\d{1,2}:\d{1,2}:\d{1,2}", "HH:mm:ss", "\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}", "HH:mm:ss.SSS", "\d{4}年\d{1,2}月\d{1,2}日", "yyyy年MM月dd日", "\d{4}-\d{1,2}-\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}", "yyyy-MM-dd HH:mm:ss.SSS", "\d{4}(10|11|12|0[1-9])(30|31|[1-2][0-9]|0[1-9])(20|21|22|23|1[0-9]|0[0-9])([1-5][0-9]|0[0-9])([1-5][0-9]|0[0-9])", "yyyyMMddHHmmss", "\d{4}(10|11|12|0[1-9])(30|31|[1-2][0-9]|0[1-9])", "yyyyMMdd", "\d{4}(10|11|12|0[1-9])(30|31|[1-2][0-9]|0[1-9])(20|21|22|23|1[0-9]|0[0-9])([1-5][0-9]|0[0-9])([1-5][0-9]|0[0-9])\d{1,3}", "yyyyMMddHHmmssSSS", "\d{4}(10|11|12|0[1-9])", "yyyyMM", "\d{4}\/\d{1,2}\/\d{1,2}", "yyyy/MM/dd", "\d{4}\.\d{1,2}\.\d{1,2}", "yyyy.MM.dd", "\d{1,2}\-\d{1,2}\-\d{4}", "MM-dd-yyyy", "\d{1,2}\/\d{1,2}\/\d{4}", "MM/dd/yyyy", "\d{1,2}\/\d{1,2}\/\d{2}", "MM/dd/yy", "\d{4}\/\d{1,2}\/\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}", "yyyy/MM/dd'T'HH:mm:ss", "\d{4}\/\d{1,2}\/\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}", "yyyy/MM/dd't'HH:mm:ss", "\d{4}-\d{1,2}-\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}", "yyyy-MM-dd'T'HH:mm:ss", "\d{4}-\d{1,2}-\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}", "yyyy-MM-dd't'HH:mm:ss", "\d{4}\/\d{1,2}\/\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}Z", "yyyy/MM/dd'T'HH:mm:ss.SSS'Z'", "\d{4}\/\d{1,2}\/\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}z", "yyyy/MM/dd't'HH:mm:ss.SSS'z'", "\d{4}-\d{1,2}-\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}Z", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "\d{4}-\d{1,2}-\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}z", "yyyy-MM-dd't'HH:mm:ss.SSS'z'" }; /** * 日期格式，正则表达式 */ private static String[] supportDateFmtPattern = new String[]{ "\d{4}\-\d{1,2}\-\d{1,2}", "yyyy-MM-dd", "\d{4}年\d{1,2}月\d{1,2}日", "yyyy年MM月dd日", "\d{4}(10|11|12|0[1-9])(30|31|[1-2][0-9]|0[1-9])", "yyyyMMdd", "\d{4}(10|11|12|0[1-9])", "yyyyMM", "\d{4}\/\d{1,2}\/\d{1,2}", "yyyy/MM/dd", "\d{4}\.\d{1,2}\.\d{1,2}", "yyyy.MM.dd", "\d{1,2}\-\d{1,2}\-\d{4}", "MM-dd-yyyy", "\d{1,2}\/\d{1,2}\/\d{4}", "MM/dd/yyyy", "\d{1,2}\/\d{1,2}\/\d{2}", "MM/dd/yy" }; /** * 时间格式，正则表达式 */ private static String[] supportTimeFmtPattern = new String[]{ "\d{4}-\d{1,2}-\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2}", "yyyy-MM-dd HH:mm:ss", "\d{1,2}:\d{1,2}:\d{1,2}", "HH:mm:ss", "\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}", "HH:mm:ss.SSS", "\d{4}-\d{1,2}-\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}", "yyyy-MM-dd HH:mm:ss.SSS", "\d{4}(10|11|12|0[1-9])(30|31|[1-2][0-9]|0[1-9])(20|21|22|23|1[0-9]|0[0-9])([1-5][0-9]|0[0-9])([1-5][0-9]|0[0-9])", "yyyyMMddHHmmss", "\d{4}(10|11|12|0[1-9])(30|31|[1-2][0-9]|0[1-9])(20|21|22|23|1[0-9]|0[0-9])([1-5][0-9]|0[0-9])([1-5][0-9]|0[0-9])\d{1,3}", "yyyyMMddHHmmssSSS", "\d{4}\/\d{1,2}\/\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}", "yyyy/MM/dd'T'HH:mm:ss", "\d{4}\/\d{1,2}\/\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}", "yyyy/MM/dd't'HH:mm:ss", "\d{4}-\d{1,2}-\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}", "yyyy-MM-dd'T'HH:mm:ss", "\d{4}-\d{1,2}-\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}", "yyyy-MM-dd't'HH:mm:ss", "\d{4}\/\d{1,2}\/\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}Z", "yyyy/MM/dd'T'HH:mm:ss.SSS'Z'", "\d{4}\/\d{1,2}\/\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}z", "yyyy/MM/dd't'HH:mm:ss.SSS'z'", "\d{4}-\d{1,2}-\d{1,2}T\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}Z", "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "\d{4}-\d{1,2}-\d{1,2}t\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3}z", "yyyy-MM-dd't'HH:mm:ss.SSS'z'" }; /** * 根据日期时间串推断日期格式 * * @param datestr 日期字符串 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String checkFmtByPattern(String datestr) { if (datestr == null) return null; for (int i = 0; i * yyyy-MM-dd HH:mm:ss.SSS <br> * yyyy-MM-dd HH:mm:ss <br> * yyyy-MM-dd <br> * yyyy.MM.dd <br> * yyyy/MM/dd <br> * HH:mm:ss.SSS <br> * HH:mm:ss <br> * yyyyMMdd <br> * yyyyMMddHHmmssSSS <br> * yyyyMMddHHmmss <br> * yyyyMM <br> * * @param datestr * @return */ public static Date parse(String datestr) { String fmt = checkFmtByPattern(datestr); return parse(datestr, fmt); } /** * 获取yyyy-MM-dd日期类型 * * @param dateStr 日期字符串 * @param fmt 日期格式 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Date parse(String dateStr, String fmt) { try { return getSdf(fmt).parse(dateStr); } catch (NullPointerException | ParseException e) { throw new RuntimeException(String.format("不支持的时间格式，[%s]", dateStr)); } } /** * 获取yyyy-MM-dd日期类型 * * @param datestr 日期字符串 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Date parseDay(String datestr) { try { return getSdf(supportFmt[1]).parse(datestr); } catch (ParseException e) { throw new RuntimeException("不支持的时间格式"); } } /** * 获取yyyy-MM-dd HH:mm:ss日期类型 * * @param datestr 日期字符串 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Date parseDayTime(String datestr) { try { return getSdf(supportFmt[0]).parse(datestr); } catch (ParseException e) { throw new RuntimeException("不支持的时间格式"); } } /** * 将日期格式化成指定格式 * * @param dt 日期 * @param dt 格式字符串 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String format(Date dt, String... pattern) { if (pattern != null && pattern.length > 1) { throw new RuntimeException("日期格式字符串，只支持一个"); } String format = pattern.length 1) { throw new RuntimeException("日期格式字符串，只支持一个"); } int days = 0; try { SimpleDateFormat myFormatter = new SimpleDateFormat(format.length 1) { throw new RuntimeException("日期格式字符串，只支持一个"); } long time = ManagementFactory.getRuntimeMXBean().getStartTime(); return format(new Date(time), format.length = 3600 * 24) {//天 return NumFormat(second / 60 / 60 / 24) + "天" + NumFormat(second / 60 / 60 % 24) + "小时" + NumFormat(second / 60 % 60) + "分"; } } return "--"; } /** * 获取当前时间前面某天或者后面某天 * * @param date 日期 * @param amount 相隔天数，正数表示未来日期，负数表示过去日期 * @return java.util.Date * @author compass * @date 2022/10/21 14:49 * @since 1.0.0 **/ public static Date getOtherDay(Date date, int amount) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.add(Calendar.DAY_OF_MONTH, amount); Date time = calendar.getTime(); return time; } /** * 获取周几 * * @param date * @return */ public static String getWeek(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); int weekday = calendar.get(Calendar.DAY_OF_WEEK); String week = null; if (weekday == 1) { week = "星期天"; } else if (weekday == 2) { week = "星期一"; } else if (weekday == 3) { week = "星期二"; } else if (weekday == 4) { week = "星期三"; } else if (weekday == 5) { week = "星期四"; } else if (weekday == 6) { week = "星期五"; } else if (weekday == 7) { week = "星期六"; } return week; } /** * 判断是不是本周 * * @param date 日期 * @return boolean * @author compass * @date 2022/10/21 14:54 * @since 1.0.0 **/ public static boolean isThisWeek(Date date) { Calendar calendar = Calendar.getInstance(); int currentWeek = calendar.get(Calendar.WEEK_OF_YEAR); calendar.setTime(date); int dateWeek = calendar.get(Calendar.WEEK_OF_YEAR); if (currentWeek == dateWeek) { return true; } return false; } /** * 判断是不是本周 * * @param date 日期 * @param format 日期格式字符 * @return boolean * @author compass * @date 2022/10/21 14:54 * @since 1.0.0 **/ public static boolean isThisWeek(String date, String format) { Calendar calendar = Calendar.getInstance(); int currentWeek = calendar.get(Calendar.WEEK_OF_YEAR); calendar.setTime(parse(date, format)); int dateWeek = calendar.get(Calendar.WEEK_OF_YEAR); if (currentWeek == dateWeek) { return true; } return false; } /** * 判断当前时间 * * @param date 日期 * @param format 日期格式 * @return boolean * @author compass * @date 2022/10/21 15:01 * @since 1.0.0 **/ private static boolean isThisTime(Date date, String format) { SimpleDateFormat sdf = new SimpleDateFormat(format); String dateFormat = sdf.format(date); String nowFormat = sdf.format(new Date()); if (dateFormat.equals(nowFormat)) { return true; } return false; } /** * 判断是否是当天 * * @param date 日期 * @return boolean * @author compass * @date 2022/10/21 15:01 * @since 1.0.0 **/ public static boolean isThisDay(Date date) { return isThisTime(date, "YYYY-MM-dd"); } /** * 判断是否是本月 * * @param date 日期 * @return boolean * @author compass * @date 2022/10/21 15:01 * @since 1.0.0 **/ public static boolean isThisMonth(Date date) { return isThisTime(date, "YYYY-MM-dd"); } /** * 获取某月开始时间 * * @param date 日期 * @return java.time.LocalDateTime * @author compass * @date 2022/10/21 16:57 * @since 1.0.0 **/ public static LocalDateTime getMonthBeginTime(Date date) { LocalDateTime localDateTime = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime(); YearMonth yearMonth = YearMonth.of(localDateTime.getYear(), localDateTime.getMonth()); LocalDate localDate = yearMonth.atDay(1); return localDate.atStartOfDay(); } /** * 获取某月开始时间 * * @param date 日期字符串 * @return java.time.LocalDateTime * @author compass * @date 2022/10/21 16:57 * @since 1.0.0 **/ public static LocalDateTime getMonthBeginTime(String date) { return getMonthBeginTime(parse(date)); } /** * 获取某月结束时间 * * @param date 日期 * @return java.time.LocalDateTime * @author compass * @date 2022/10/21 16:57 * @since 1.0.0 **/ public static LocalDateTime getMonthEndTime(Date date) { LocalDateTime localDateTime = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime(); YearMonth yearMonth = YearMonth.of(localDateTime.getYear(), localDateTime.getMonth()); LocalDate endOfMonth = yearMonth.atEndOfMonth(); return endOfMonth.atTime(23, 59, 59, 999); } /** * 获取某月结束时间 * * @param date 日期字符串 * @return java.time.LocalDateTime * @author compass * @date 2022/10/21 16:57 * @since 1.0.0 **/ public static LocalDateTime getMonthEndTime(String date) { return getMonthEndTime(parse(date)); } /** * 获取指定时间范围内的所有日期[date] * @param dBegin 开始日期 * @param dEnd 结束日期 * @return java.util.List * @author compass * @date 2022/10/21 17:11 * @since 1.0.0 **/ public static List findBetweenAll(Date dBegin, Date dEnd) { List dateList = new ArrayList(); Calendar calBegin = Calendar.getInstance(); // 使用给定的 Date 设置此 Calendar 的开始时间 calBegin.setTime(dBegin); Calendar calEnd = Calendar.getInstance(); // 使用给定的 Date 设置此 Calendar 的结束时间 calEnd.setTime(dEnd); // 测试此日期是否在指定日期之后 while (dEnd.after(calBegin.getTime())) { // 根据日历的规则，为给定的日历字段添加或减去指定的时间量 calBegin.add(Calendar.DAY_OF_MONTH, 1); dateList.add(calBegin.getTime()); } return dateList; } /** * 获取指定时间范围内的所有日期[字符串] * @param dBegin 开始日期 * @param dEnd 结束日期 * @param format 日期格式字符串 * @return java.util.List * @author compass * @date 2022/10/21 17:11 * @since 1.0.0 **/ public static List findBetweenAll(String dBegin, String dEnd,String format) { Date tempEndDate = parse(dEnd); List dateList = new ArrayList(); Calendar calBegin = Calendar.getInstance(); // 使用给定的 Date 设置此 Calendar 的开始时间 calBegin.setTime(parse(dBegin)); Calendar calEnd = Calendar.getInstance(); // 使用给定的 Date 设置此 Calendar 的结束时间 calEnd.setTime(tempEndDate); // 测试此日期是否在指定日期之后 while (tempEndDate.after(calBegin.getTime())) { // 根据日历的规则，为给定的日历字段添加或减去指定的时间量 calBegin.add(Calendar.DAY_OF_MONTH, 1); String date = format( calBegin.getTime(),format); dateList.add(date); } return dateList; }} |
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