2025年Java字符串转时间（java字符串转时间类型）

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package com.hexiang.utils;
@(#)DateUtil.java * *
@author kidd
@version 1.00 2007/8/8 / import java.util.; import java.text.*; import java.sql.Timestamp;
public class DateUtils {
/ * <em>时间</em>范围：年 */ public static final int YEAR = 1; / * <em>时间</em>范围：季度 */ public static final int QUARTER = 2; / * <em>时间</em>范围：月 */ public static final int MONTH = 3; / * <em>时间</em>范围：旬 */ public static final int TENDAYS = 4; / * <em>时间</em>范围：周 */ public static final int WEEK = 5; / * <em>时间</em>范围：日 */ public static final int DAY = 6; /* 基准<em>时间</em> */ private Date fiducialDate = null; private Calendar cal = null; private DateUtils(Date fiducialDate) { if (fiducialDate != null) { this.fiducialDate = fiducialDate; } else { this.fiducialDate = new Date(System.currentTimeMillis()); } this.cal = Calendar.getInstance(); this.cal.setTime(this.fiducialDate); this.cal.set(Calendar.HOUR_OF_DAY, 0); this.cal.set(Calendar.MINUTE, 0); this.cal.set(Calendar.SECOND, 0); this.cal.set(Calendar.MILLISECOND, 0); this.fiducialDate = this.cal.getTime(); } / * 获取DateHelper实例 * * @param fiducialDate * 基准<em>时间</em> * @return Date */ public static DateUtils getInstance(Date fiducialDate) { return new DateUtils(fiducialDate); } / * 获取DateHelper实例, 使用当前<em>时间</em>作为基准<em>时间</em> * * @return Date */ public static DateUtils getInstance() { return new DateUtils(null); } / * 获取年的第一天 * * @param offset * 偏移量 * @return Date */ public Date getFirstDayOfYear(int offset) { cal.setTime(this.fiducialDate); cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + offset); cal.set(Calendar.MONTH, Calendar.JANUARY); cal.set(Calendar.DAY_OF_MONTH, 1); return cal.getTime(); } / * 获取年的最后一天 * * @param offset * 偏移量 * @return Date */ public Date getLastDayOfYear(int offset) { cal.setTime(this.fiducialDate); cal.set(Calendar.YEAR, cal.get(Calendar.YEAR) + offset); cal.set(Calendar.MONTH, Calendar.DECEMBER); cal.set(Calendar.DAY_OF_MONTH, 31); return cal.getTime(); } / * 获取季度的第一天 * * @param offset * 偏移量 * @return Date */ public Date getFirstDayOfQuarter(int offset) { cal.setTime(this.fiducialDate); cal.add(Calendar.MONTH, offset * 3); int mon = cal.get(Calendar.MONTH); if (mon &gt;= Calendar.JANUARY &amp;&amp; mon = Calendar.APRIL &amp;&amp; mon = Calendar.JULY &amp;&amp; mon = Calendar.OCTOBER &amp;&amp; mon = Calendar.JANUARY &amp;&amp; mon = Calendar.APRIL &amp;&amp; mon = Calendar.JULY &amp;&amp; mon = Calendar.OCTOBER &amp;&amp; mon = 21) { day = 21; } else if (day &gt;= 11) { day = 11; } else { day = 1; } if (offset &gt; 0) { day = day + 10 * offset; int monOffset = day / 30; day = day % 30; cal.add(Calendar.MONTH, monOffset); cal.set(Calendar.DAY_OF_MONTH, day); } else { int monOffset = 10 * offset / 30; int dayOffset = 10 * offset % 30; if ((day + dayOffset) &gt; 0) { day = day + dayOffset; } else { monOffset = monOffset - 1; day = day - dayOffset - 10; } cal.add(Calendar.MONTH, monOffset); cal.set(Calendar.DAY_OF_MONTH, day); } return cal.getTime(); } / * 获取旬的最后一天 * * @param offset * 偏移量 * @return Date */ public Date getLastDayOfTendays(int offset) { Date date = getFirstDayOfTendays(offset + 1); cal.setTime(date); cal.add(Calendar.DAY_OF_MONTH, -1); return cal.getTime(); } / * 获取周的第一天(MONDAY) * * @param offset * 偏移量 * @return Date */ public Date getFirstDayOfWeek(int offset) { cal.setTime(this.fiducialDate); cal.add(Calendar.DAY_OF_MONTH, offset * 7); cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); return cal.getTime(); } / * 获取周的最后一天(SUNDAY) * * @param offset * 偏移量 * @return Date */ public Date getLastDayOfWeek(int offset) { cal.setTime(this.fiducialDate); cal.add(Calendar.DAY_OF_MONTH, offset * 7); cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); cal.add(Calendar.DAY_OF_MONTH, 6); return cal.getTime(); } / * 获取指定<em>时间</em>范围的第一天 * * @param dateRangeType * <em>时间</em>范围类型 * @param offset * 偏移量 * @return Date */ public Date getFirstDate(int dateRangeType, int offset) { return null; } / * 获取指定<em>时间</em>范围的最后一天 * * @param dateRangeType * <em>时间</em>范围类型 * @param offset * 偏移量 * @return Date */ public Date getLastDate(int dateRangeType, int offset) { return null; } / * 根据日历的规则，为基准<em>时间</em>添加指定日历字段的<em>时间</em>量 * * @param field * 日历字段, 使用Calendar类定义的日历字段常量 * @param offset * 偏移量 * @return Date */ public Date add(int field, int offset) { cal.setTime(this.fiducialDate); cal.add(field, offset); return cal.getTime(); } / * 根据日历的规则，为基准<em>时间</em>添加指定日历字段的单个<em>时间</em>单元 * * @param field * 日历字段, 使用Calendar类定义的日历字段常量 * @param up * 指定日历字段的值的滚动方向。true:向上滚动 / false:向下滚动 * @return Date */ public Date roll(int field, boolean up) { cal.setTime(this.fiducialDate); cal.roll(field, up); return cal.getTime(); } / * 把字符串转换为日期 * * @param dateStr * 日期字符串 * @param format * 日期格式 * @return Date */ public static Date strToDate(String dateStr, String format) { Date date = null; if (dateStr != null &amp;&amp; (!dateStr.equals(&quot;&quot;))) { DateFormat df = new SimpleDateFormat(format); try { date = df.parse(dateStr); } catch (ParseException e) { e.printStackTrace(); } } return date; } / * 把字符串转换为日期，日期的格式为yyyy-MM-dd HH:ss * * @param dateStr * 日期字符串 * @return Date */ public static Date strToDate(String dateStr) { Date date = null; if (dateStr != null &amp;&amp; (!dateStr.equals(&quot;&quot;))) { if (dateStr.matches(&quot;\d{4}-\d{1,2}-\d{1,2}&quot;)) { dateStr = dateStr + &quot; 00:00&quot;; } else if (dateStr.matches(&quot;\d{4}-\d{1,2}-\d{1,2} \d{1,2}&quot;)) { dateStr = dateStr + &quot;:00&quot;; } else { System.out.println(dateStr + &quot; 格式不正确&quot;); return null; } DateFormat df = new SimpleDateFormat(&quot;yyyy-MM-dd HH:ss&quot;); try { date = df.parse(dateStr); } catch (ParseException e) { e.printStackTrace(); } } return date; } / * 把日期转换为字符串 * * @param date * 日期实例 * @param format * 日期格式 * @return Date */ public static String dateToStr(Date date, String format) { return (date == null) ? &quot;&quot; : new SimpleDateFormat(format).format(date); } public static String dateToStr(Date date) { return (date == null) ? &quot;&quot; : new SimpleDateFormat(&quot;yyyy-MM-dd hh:mm:ss&quot;).format(date); } / * 取得当前日期 年-月-日 * * @return Date */ public static String getCurrentDate() { DateFormat f = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;); return f.format(Calendar.getInstance().getTime()); } public static void main(String[] args) { DateUtils dateHelper = DateUtils.getInstance(); /* Year */ for (int i = -5; i &lt;= 5; i++) { System.out.println(&quot;FirstDayOfYear(&quot; + i + &quot;) = &quot; + dateHelper.getFirstDayOfYear(i)); System.out.println(&quot;LastDayOfYear(&quot; + i + &quot;) = &quot; + dateHelper.getLastDayOfYear(i)); } /* Quarter */ for (int i = -5; i &lt;= 5; i++) { System.out.println(&quot;FirstDayOfQuarter(&quot; + i + &quot;) = &quot; + dateHelper.getFirstDayOfQuarter(i)); System.out.println(&quot;LastDayOfQuarter(&quot; + i + &quot;) = &quot; + dateHelper.getLastDayOfQuarter(i)); } /* Month */ for (int i = -5; i &lt;= 5; i++) { System.out.println(&quot;FirstDayOfMonth(&quot; + i + &quot;) = &quot; + dateHelper.getFirstDayOfMonth(i)); System.out.println(&quot;LastDayOfMonth(&quot; + i + &quot;) = &quot; + dateHelper.getLastDayOfMonth(i)); } /* Week */ for (int i = -5; i &lt;= 5; i++) { System.out.println(&quot;FirstDayOfWeek(&quot; + i + &quot;) = &quot; + dateHelper.getFirstDayOfWeek(i)); System.out.println(&quot;LastDayOfWeek(&quot; + i + &quot;) = &quot; + dateHelper.getLastDayOfWeek(i)); } /* Tendays */ for (int i = -5; i &lt;= 5; i++) { System.out.println(&quot;FirstDayOfTendays(&quot; + i + &quot;) = &quot; + dateHelper.getFirstDayOfTendays(i)); System.out.println(&quot;LastDayOfTendays(&quot; + i + &quot;) = &quot; + dateHelper.getLastDayOfTendays(i)); } } / * 取当前日期的字符串形式,&quot;XXXX年XX月XX日&quot; * * @return <em>java</em>.lang.String */ public static String getPrintDate() { String printDate = &quot;&quot;; Calendar calendar = Calendar.getInstance(); calendar.setTime(new Date()); printDate += calendar.get(Calendar.YEAR) + &quot;年&quot;; printDate += (calendar.get(Calendar.MONTH) + 1) + &quot;月&quot;; printDate += calendar.get(Calendar.DATE) + &quot;日&quot;; return printDate; } / * 将指定的日期字符串转化为日期对象 * * @param dateStr * 日期字符串 * @return <em>java</em>.util.Date */ public static Date getDate(String dateStr, String format) { if (dateStr == null) { return new Date(); } if (format == null) { format = &quot;yyyy-MM-dd&quot;; } SimpleDateFormat sdf = new SimpleDateFormat(format); try { Date date = sdf.parse(dateStr); return date; } catch (Exception e) { return null; } } / * 从指定Timestamp中得到相应的日期的字符串形式 日期&quot;XXXX-XX-XX&quot; * * @param dateTime * @return 、String */ public static String getDateFromDateTime(Timestamp dateTime) { SimpleDateFormat sdf = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;); return sdf.format(dateTime).toString(); } / * 得到当前<em>时间</em> return <em>java</em>.sql.Timestamp * * @return Timestamp */ public static Timestamp getNowTimestamp() { long curTime = System.currentTimeMillis(); return new Timestamp(curTime); }
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}
2025年Java字符串转时间（java字符串转时间类型）

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