日期工具类 - DateUtil.java-白红宇

日期工具类 - DateUtil.java

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发布时间：2019-06-12

本文共 9447 字，大约阅读时间需要 31 分钟。

日期工具类，提供对日期的格式化和转换方法、获取区间日期、指定日期、每月最后一天等。

源码如下：(点击下载 -、 )

1 import java.text.DateFormat;  2 import java.text.ParseException;  3 import java.text.SimpleDateFormat;  4 import java.util.ArrayList;  5 import java.util.Calendar;  6 import java.util.Date;  7 import java.util.GregorianCalendar;  8 import java.util.List;  9 import org.apache.commons.lang.StringUtils; 10  11 /** 12  * 日期工具类 13  *  14  */ 15 public class DateUtil { 16  17     // 默认日期格式 18     public static final String DATE_DEFAULT_FORMAT = "yyyy-MM-dd"; 19  20     // 默认时间格式 21     public static final String DATETIME_DEFAULT_FORMAT = "yyyy-MM-dd HH:mm:ss"; 22  23     public static final String TIME_DEFAULT_FORMAT = "HH:mm:ss"; 24  25     // 日期格式化 26     private static DateFormat dateFormat = null; 27  28     // 时间格式化 29     private static DateFormat dateTimeFormat = null; 30  31     private static DateFormat timeFormat = null; 32  33     private static Calendar gregorianCalendar = null; 34  35     static { 36         dateFormat = new SimpleDateFormat(DATE_DEFAULT_FORMAT); 37         dateTimeFormat = new SimpleDateFormat(DATETIME_DEFAULT_FORMAT); 38         timeFormat = new SimpleDateFormat(TIME_DEFAULT_FORMAT); 39         gregorianCalendar = new GregorianCalendar(); 40     } 41  42     /** 43      * 日期格式化yyyy-MM-dd 44      *  45      * @param date 46      * @return 47      */ 48     public static Date formatDate(String date, String format) { 49         try { 50             return new SimpleDateFormat(format).parse(date); 51         } catch (ParseException e) { 52             e.printStackTrace(); 53         } 54         return null; 55     } 56  57     /** 58      * 日期格式化yyyy-MM-dd 59      *  60      * @param date 61      * @return 62      */ 63     public static String getDateFormat(Date date) { 64         return dateFormat.format(date); 65     } 66  67     /** 68      * 日期格式化yyyy-MM-dd HH:mm:ss 69      *  70      * @param date 71      * @return 72      */ 73     public static String getDateTimeFormat(Date date) { 74         return dateTimeFormat.format(date); 75     } 76  77     /** 78      * 时间格式化 79      *  80      * @param date 81      * @return HH:mm:ss 82      */ 83     public static String getTimeFormat(Date date) { 84         return timeFormat.format(date); 85     } 86  87     /** 88      * 日期格式化 89      *  90      * @param date 91      * @param 格式类型 92      * @return 93      */ 94     public static String getDateFormat(Date date, String formatStr) { 95         if (StringUtils.isNotBlank(formatStr)) { 96             return new SimpleDateFormat(formatStr).format(date); 97         } 98         return null; 99     }100 101     /**102      * 日期格式化103      * 104      * @param date105      * @return106      */107     public static Date getDateFormat(String date) {108         try {109             return dateFormat.parse(date);110         } catch (ParseException e) {111             e.printStackTrace();112         }113         return null;114     }115 116     /**117      * 时间格式化118      * 119      * @param date120      * @return121      */122     public static Date getDateTimeFormat(String date) {123         try {124             return dateTimeFormat.parse(date);125         } catch (ParseException e) {126             e.printStackTrace();127         }128         return null;129     }130 131     /**132      * 获取当前日期(yyyy-MM-dd)133      * 134      * @param date135      * @return136      */137     public static Date getNowDate() {138         return DateUtil.getDateFormat(dateFormat.format(new Date()));139     }140 141     /**142      * 获取当前日期星期一日期143      * 144      * @return date145      */146     public static Date getFirstDayOfWeek() {147         gregorianCalendar.setFirstDayOfWeek(Calendar.MONDAY);148         gregorianCalendar.setTime(new Date());149         gregorianCalendar.set(Calendar.DAY_OF_WEEK, gregorianCalendar.getFirstDayOfWeek()); // Monday150         return gregorianCalendar.getTime();151     }152 153     /**154      * 获取当前日期星期日日期155      * 156      * @return date157      */158     public static Date getLastDayOfWeek() {159         gregorianCalendar.setFirstDayOfWeek(Calendar.MONDAY);160         gregorianCalendar.setTime(new Date());161         gregorianCalendar.set(Calendar.DAY_OF_WEEK, gregorianCalendar.getFirstDayOfWeek() + 6); // Monday162         return gregorianCalendar.getTime();163     }164 165     /**166      * 获取日期星期一日期167      * 168      * @param 指定日期169      * @return date170      */171     public static Date getFirstDayOfWeek(Date date) {172         if (date == null) {173             return null;174         }175         gregorianCalendar.setFirstDayOfWeek(Calendar.MONDAY);176         gregorianCalendar.setTime(date);177         gregorianCalendar.set(Calendar.DAY_OF_WEEK, gregorianCalendar.getFirstDayOfWeek()); // Monday178         return gregorianCalendar.getTime();179     }180 181     /**182      * 获取日期星期一日期183      * 184      * @param 指定日期185      * @return date186      */187     public static Date getLastDayOfWeek(Date date) {188         if (date == null) {189             return null;190         }191         gregorianCalendar.setFirstDayOfWeek(Calendar.MONDAY);192         gregorianCalendar.setTime(date);193         gregorianCalendar.set(Calendar.DAY_OF_WEEK, gregorianCalendar.getFirstDayOfWeek() + 6); // Monday194         return gregorianCalendar.getTime();195     }196 197     /**198      * 获取当前月的第一天199      * 200      * @return date201      */202     public static Date getFirstDayOfMonth() {203         gregorianCalendar.setTime(new Date());204         gregorianCalendar.set(Calendar.DAY_OF_MONTH, 1);205         return gregorianCalendar.getTime();206     }207 208     /**209      * 获取当前月的最后一天210      * 211      * @return212      */213     public static Date getLastDayOfMonth() {214         gregorianCalendar.setTime(new Date());215         gregorianCalendar.set(Calendar.DAY_OF_MONTH, 1);216         gregorianCalendar.add(Calendar.MONTH, 1);217         gregorianCalendar.add(Calendar.DAY_OF_MONTH, -1);218         return gregorianCalendar.getTime();219     }220 221     /**222      * 获取指定月的第一天223      * 224      * @param date225      * @return226      */227     public static Date getFirstDayOfMonth(Date date) {228         gregorianCalendar.setTime(date);229         gregorianCalendar.set(Calendar.DAY_OF_MONTH, 1);230         return gregorianCalendar.getTime();231     }232 233     /**234      * 获取指定月的最后一天235      * 236      * @param date237      * @return238      */239     public static Date getLastDayOfMonth(Date date) {240         gregorianCalendar.setTime(date);241         gregorianCalendar.set(Calendar.DAY_OF_MONTH, 1);242         gregorianCalendar.add(Calendar.MONTH, 1);243         gregorianCalendar.add(Calendar.DAY_OF_MONTH, -1);244         return gregorianCalendar.getTime();245     }246 247     /**248      * 获取日期前一天249      * 250      * @param date251      * @return252      */253     public static Date getDayBefore(Date date) {254         gregorianCalendar.setTime(date);255         int day = gregorianCalendar.get(Calendar.DATE);256         gregorianCalendar.set(Calendar.DATE, day - 1);257         return gregorianCalendar.getTime();258     }259 260     /**261      * 获取日期后一天262      * 263      * @param date264      * @return265      */266     public static Date getDayAfter(Date date) {267         gregorianCalendar.setTime(date);268         int day = gregorianCalendar.get(Calendar.DATE);269         gregorianCalendar.set(Calendar.DATE, day + 1);270         return gregorianCalendar.getTime();271     }272 273     /**274      * 获取当前年275      * 276      * @return277      */278     public static int getNowYear() {279         Calendar d = Calendar.getInstance();280         return d.get(Calendar.YEAR);281     }282 283     /**284      * 获取当前月份285      * 286      * @return287      */288     public static int getNowMonth() {289         Calendar d = Calendar.getInstance();290         return d.get(Calendar.MONTH) + 1;291     }292 293     /**294      * 获取当月天数295      * 296      * @return297      */298     public static int getNowMonthDay() {299         Calendar d = Calendar.getInstance();300         return d.getActualMaximum(Calendar.DATE);301     }302 303     /**304      * 获取时间段的每一天305      * 306      * @param 开始日期307      * @param 结算日期308      * @return 日期列表309      */310     public static List
     
       getEveryDay(Date startDate, Date endDate) {311         if (startDate == null || endDate == null) {312             return null;313         }314         // 格式化日期(yy-MM-dd)315         startDate = DateUtil.getDateFormat(DateUtil.getDateFormat(startDate));316         endDate = DateUtil.getDateFormat(DateUtil.getDateFormat(endDate));317         List
      
        dates = new ArrayList
       
        ();318         gregorianCalendar.setTime(startDate);319         dates.add(gregorianCalendar.getTime());320         while (gregorianCalendar.getTime().compareTo(endDate) < 0) {321             // 加1天322             gregorianCalendar.add(Calendar.DAY_OF_MONTH, 1);323             dates.add(gregorianCalendar.getTime());324         }325         return dates;326     }327 328     /**329      * 获取提前多少个月330      * 331      * @param monty332      * @return333      */334     public static Date getFirstMonth(int monty) {335         Calendar c = Calendar.getInstance();336         c.add(Calendar.MONTH, -monty);337         return c.getTime();338     }339 }