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，需要的可以参考一下
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：
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<String, ThreadLocal<SimpleDateFormat>> 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<SimpleDateFormat> 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 < supportFmtPattern.length; i += 2) { if (Pattern.matches(supportFmtPattern[i], datestr)) { return supportFmtPattern[i + 1]; } } return null; } /** * 根据字符串格式自动判断日期格式，支持11种 <br> * 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 <= 0 ?DEFAULT_DATETIME_FORMAT : pattern[0]; return getSdf(format).format(dt); } /** * 将日期格式化为yyyy-MM-dd HH:mm:ss * * @param dt 日期 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String formatDayTime(Date dt) { return getSdf(supportFmt[0]).format(dt); } /** * 将日期格式化为yyyy-MM-dd * * @param dt 开日期 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String formatDay(Date dt) { return getSdf(supportFmt[1]).format(dt); } /** * 将日期格式化为HH:mm:ss * * @param dt 开日期 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String formatTime(Date dt) { return getSdf(supportFmt[4]).format(dt); } /** * 计算月份差[日期型]，按月份计算忽略天数 * * @param fromDate 开始日期 * @param toDate 结束日期 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Integer monthBetween(Date fromDate, Date toDate) { if ((fromDate == null) || (toDate == null)) { return null; } int times = 1; if (!fromDate.after(toDate)) { Calendar calFrom = Calendar.getInstance(); Calendar calTo = Calendar.getInstance(); calFrom.setTime(fromDate); calFrom.set(Calendar.DAY_OF_MONTH, 1); calTo.setTime(toDate); calTo.set(Calendar.DAY_OF_MONTH, 1); while (calFrom.before(calTo)) { calFrom.add(2, 1); times++; } } else { return 0; } return times; } /** * 计算月份差(字符型)，自动判定格式 * * @param fromDate 开始日期 * @param toDate 结束日期 * @return java.lang.Integer * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Integer monthBetween(String fromDate, String toDate) { if ((fromDate == null) || (toDate == null)) { return null; } return monthBetween(parse(fromDate), parse(toDate)); } /** * 计算天数差 * * @param from 开始日期 * @param end 结束日期 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Integer daysBetween(Date from, Date end) { if ((from == null) || (end == null)) { return null; } long fromL = from.getTime(); long endL = end.getTime(); double diff = (endL - fromL) / 86400000L; return new Integer(new Double(Math.ceil(diff)).intValue()); } /** * 计算天数差 * * @param from 开始日期 * @param end 结束日期 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Integer dayBetween(String from, String end) { if ((from == null) || (end == null)) { return null; } return daysBetween(parse(from), parse(end)); } /** * 日期年月加减 +天 * * @param date 日期 * @param adds 天数 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Date addDay(Date date, int adds) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.DATE, adds); return cal.getTime(); } /** * 日期字符串年月加减 +天 * * @param date 日期字符串 * @param adds 天数 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String addDay(String date, int adds) { String fmt = checkFmtByPattern(date); Date r = addDay(parse(date), adds); return format(r, fmt); } /** * 日期年月加减 +月 * * @param date 日期 * @param adds 天数 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Date addMonth(Date date, int adds) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.MONTH, adds); return cal.getTime(); } /** * 日期年月加减 +月 * * @param date 日期字符串 * @param adds 天数 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String addMonth(String date, int adds) { String fmt = checkFmtByPattern(date); Date r = addMonth(parse(date), adds); return format(r, fmt); } /** * 日期年月加减 +年 * * @param date 日期 * @param adds 天数 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static Date addYear(Date date, int adds) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.YEAR, adds); return cal.getTime(); } /** * 日期年月加减 +年 * * @param date 日期字符串 * @param adds 天数 * @return java.util.Date * @author compass * @date 2022/10/21 11:06 * @since 1.0.0 **/ public static String addYear(String date, int adds) { String fmt = checkFmtByPattern(date); Date r = addYear(parse(date), adds); return format(r, fmt); } /** * 返回当前日期 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static Date getNowDate() { return new Date(); } /** * 返回当前日期字符串 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static String getNowStr(String format) { return getSdf(format).format(new Date()); } /** * 返回当前年 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static int getNowYear() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.YEAR); } /** * 返回当前月 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static int getNowMonth() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.MONTH); } /** * 获取今天是多少号 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static int getNowDay() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.DAY_OF_MONTH); } /** * 返回当前日期是今年的第几天 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static int getNowDayOfYear() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.DAY_OF_YEAR); } /** * 获取今天是星期几 * * @return java.util.Date * @author compass * @date 2022/10/21 11:10 * @since 1.0.0 **/ public static int getNowDayOfWeek() { Calendar calendar = Calendar.getInstance(); return calendar.get(Calendar.DAY_OF_WEEK) - 1; } /** * 获取日期字符串的某一个时间单位 * * @param dateStr 日期字符串 * @param format 日期格式化模式 默认：yyyy/MM/dd * @param unit 获取的日期单位 * @return int * @author compass * @date 2022/9/14 * @since 1.0.0 **/ public static int getDateUnit(String dateStr, String format, DateTools.DateType unit) { int type = unit.getValue(); format = StringUtils.isNotBlank(format) ? format : DEFAULT_DATETIME_FORMAT; SimpleDateFormat sdf = new SimpleDateFormat(format); Calendar startCalendar = Calendar.getInstance(); Date dateTime = null; try { dateTime = sdf.parse(dateStr); } catch (ParseException e) { e.printStackTrace(); throw new RuntimeException("日期格式错误"); } startCalendar.setTime(dateTime); int year = startCalendar.get(Calendar.YEAR); int month = startCalendar.get(Calendar.MONTH) + 1; int day = startCalendar.get(Calendar.DAY_OF_MONTH); int hour = startCalendar.get(Calendar.HOUR_OF_DAY); int minute = startCalendar.get(Calendar.MINUTE); int second = startCalendar.get(Calendar.SECOND); switch (type) { case 1: return year; case 2: return month; case 3: return day; case 4: return hour; case 5: return minute; case 6: return second; default: throw new RuntimeException("日期单位不正确"); } } /** * 计算距离生日还有多少天 * * @param date：生日日期 * @param format：日期格式 默认：yyyy-MM-dd */ public static int getBirthDay(String date, String... format) { if (format != null && format.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 <= 0 ? "yyyy-MM-dd" : format[0]); String cliDate = date; Calendar cToday = Calendar.getInstance(); // 存今天 Calendar cBirth = Calendar.getInstance(); // 存生日 cBirth.setTime(myFormatter.parse(cliDate)); // 设置生日 cBirth.set(Calendar.YEAR, cToday.get(Calendar.YEAR)); // 修改为本年 if (cBirth.get(Calendar.DAY_OF_YEAR) < cToday.get(Calendar.DAY_OF_YEAR)) { // 生日已经过了，要算明年的了 days = cToday.getActualMaximum(Calendar.DAY_OF_YEAR) - cToday. get(Calendar.DAY_OF_YEAR); days += cBirth.get(Calendar.DAY_OF_YEAR); } else { // 生日还没过 days = cBirth.get(Calendar.DAY_OF_YEAR) - cToday.get(Calendar.DAY_OF_YEAR); } } catch (ParseException e) { e.printStackTrace(); } return days; } /** * 获取服务器启动时间 * * @return java.util.Date * @author compass * @date 2022/10/21 14:40 * @since 1.0.0 **/ public static Date getServerStartDate() { long time = ManagementFactory.getRuntimeMXBean().getStartTime(); return new Date(time); } /** * 获取服务器启动时间 * * @param format 日期格式 默认 yyyy-MM-dd HH:mm:ss * @return java.util.Date * @author compass * @date 2022/10/21 14:40 * @since 1.0.0 **/ public static String getServerStartDateFormat(String... format) { if (format != null && 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 <= 0 ? DEFAULT_DATETIME_FORMAT : format[0]); } /** * 格式化时间 * * @param sec 秒 * @return java.lang.String * @author compass * @date 2022/10/21 14:46 * @since 1.0.0 **/ private static String NumFormat(long sec) { if (String.valueOf(sec).length() < 2) { return "0" + sec; } else { return String.valueOf(sec); } } /** * 秒转小时分 * * @param second 秒 * @return java.lang.String * @author compass * @date 2022/10/21 14:46 * @since 1.0.0 **/ public static String getFormatTime(Long second) { if (second != null) { if (second < 3600) {//分 return NumFormat(second / 60) + "分"; } if (second < 3600 * 24) {//时 return NumFormat(second / 60 / 60) + "小时" + NumFormat(second / 60 % 60) + "分"; } if (second >= 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";
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