java获取当天，前天，明天，本周，本月，本年的开始日期时间和结束日期时间(总结一下，以后直接拿来用)

1 package demoone;
2
3 import java.sql.Timestamp;
4 import java.text.ParseException;
5 import java.text.SimpleDateFormat;
6 import java.util.ArrayList;
7 import java.util.Calendar;
8 import java.util.Date;
9 import java.util.GregorianCalendar;
10 import java.util.List;
11
12 public class DateUtils {
13     //获取当天的开始时间
14     public static java.util.Date getDayBegin() {
15         Calendar cal = new GregorianCalendar();
16         cal.set(Calendar.HOUR_OF_DAY, 0);
17         cal.set(Calendar.MINUTE, 0);
18         cal.set(Calendar.SECOND, 0);
19         cal.set(Calendar.MILLISECOND, 0);
20         return cal.getTime();
21     }
22     //获取当天的结束时间
23     public static java.util.Date getDayEnd() {
24         Calendar cal = new GregorianCalendar();
25         cal.set(Calendar.HOUR_OF_DAY, 23);
26         cal.set(Calendar.MINUTE, 59);
27         cal.set(Calendar.SECOND, 59);
28         return cal.getTime();
29     }
30     //获取昨天的开始时间
31     public static Date getBeginDayOfYesterday() {
32         Calendar cal = new GregorianCalendar();
33         cal.setTime(getDayBegin());
34         cal.add(Calendar.DAY_OF_MONTH, -1);
35         return cal.getTime();
36     }
37     //获取昨天的结束时间
38     public static Date getEndDayOfYesterDay() {
39         Calendar cal = new GregorianCalendar();
40         cal.setTime(getDayEnd());
41         cal.add(Calendar.DAY_OF_MONTH, -1);
42         return cal.getTime();
43     }
44     //获取明天的开始时间
45     public static Date getBeginDayOfTomorrow() {
46         Calendar cal = new GregorianCalendar();
47         cal.setTime(getDayBegin());
48         cal.add(Calendar.DAY_OF_MONTH, 1);
49
50         return cal.getTime();
51     }
52     //获取明天的结束时间
53     public static Date getEndDayOfTomorrow() {
54         Calendar cal = new GregorianCalendar();
55         cal.setTime(getDayEnd());
56         cal.add(Calendar.DAY_OF_MONTH, 1);
57         return cal.getTime();
58     }
59     //获取本周的开始时间
60     public static Date getBeginDayOfWeek() {
61         Date date = new Date();
62         if (date == null) {
63             return null;
64         }
65         Calendar cal = Calendar.getInstance();
66         cal.setTime(date);
67         int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
68         if (dayofweek == 1) {
69             dayofweek += 7;
70         }
71         cal.add(Calendar.DATE, 2 - dayofweek);
72         return getDayStartTime(cal.getTime());
73     }
74     //获取本周的结束时间
75     public static Date getEndDayOfWeek(){
76         Calendar cal = Calendar.getInstance();
77         cal.setTime(getBeginDayOfWeek());
78         cal.add(Calendar.DAY_OF_WEEK, 6);
79         Date weekEndSta = cal.getTime();
80         return getDayEndTime(weekEndSta);
81     }
82     //获取本月的开始时间
83      public static Date getBeginDayOfMonth() {
84             Calendar calendar = Calendar.getInstance();
85             calendar.set(getNowYear(), getNowMonth() - 1, 1);
86             return getDayStartTime(calendar.getTime());
87         }
88     //获取本月的结束时间
89      public static Date getEndDayOfMonth() {
90             Calendar calendar = Calendar.getInstance();
91             calendar.set(getNowYear(), getNowMonth() - 1, 1);
92             int day = calendar.getActualMaximum(5);
93             calendar.set(getNowYear(), getNowMonth() - 1, day);
94             return getDayEndTime(calendar.getTime());
95         }
96      //获取本年的开始时间
97      public static java.util.Date getBeginDayOfYear() {
98             Calendar cal = Calendar.getInstance();
99             cal.set(Calendar.YEAR, getNowYear());
100             // cal.set
101             cal.set(Calendar.MONTH, Calendar.JANUARY);
102             cal.set(Calendar.DATE, 1);
103
104             return getDayStartTime(cal.getTime());
105         }
106      //获取本年的结束时间
107      public static java.util.Date getEndDayOfYear() {
108             Calendar cal = Calendar.getInstance();
109             cal.set(Calendar.YEAR, getNowYear());
110             cal.set(Calendar.MONTH, Calendar.DECEMBER);
111             cal.set(Calendar.DATE, 31);
112             return getDayEndTime(cal.getTime());
113         }
114     //获取某个日期的开始时间
115     public static Timestamp getDayStartTime(Date d) {
116         Calendar calendar = Calendar.getInstance();
117         if(null != d) calendar.setTime(d);
118         calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),    calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
119         calendar.set(Calendar.MILLISECOND, 0);
120         return new Timestamp(calendar.getTimeInMillis());
121     }
122     //获取某个日期的结束时间
123     public static Timestamp getDayEndTime(Date d) {
124         Calendar calendar = Calendar.getInstance();
125         if(null != d) calendar.setTime(d);
126         calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),    calendar.get(Calendar.DAY_OF_MONTH), 23, 59, 59);
127         calendar.set(Calendar.MILLISECOND, 999);
128         return new Timestamp(calendar.getTimeInMillis());
129     }
130     //获取今年是哪一年
131      public static Integer getNowYear() {
132              Date date = new Date();
133             GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
134             gc.setTime(date);
135             return Integer.valueOf(gc.get(1));
136         }
137      //获取本月是哪一月
138      public static int getNowMonth() {
139              Date date = new Date();
140             GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
141             gc.setTime(date);
142             return gc.get(2) + 1;
143         }
144      //两个日期相减得到的天数
145      public static int getDiffDays(Date beginDate, Date endDate) {
146
147             if (beginDate == null || endDate == null) {
148                 throw new IllegalArgumentException("getDiffDays param is null!");
149             }
150
151             long diff = (endDate.getTime() - beginDate.getTime())
152                     / (1000 * 60 * 60 * 24);
153
154             int days = new Long(diff).intValue();
155
156             return days;
157         }
158     //两个日期相减得到的毫秒数
159      public static long dateDiff(Date beginDate, Date endDate) {
160             long date1ms = beginDate.getTime();
161             long date2ms = endDate.getTime();
162             return date2ms - date1ms;
163         }
164      //获取两个日期中的最大日期
165      public static Date max(Date beginDate, Date endDate) {
166             if (beginDate == null) {
167                 return endDate;
168             }
169             if (endDate == null) {
170                 return beginDate;
171             }
172             if (beginDate.after(endDate)) {
173                 return beginDate;
174             }
175             return endDate;
176         }
177      //获取两个日期中的最小日期
178      public static Date min(Date beginDate, Date endDate) {
179             if (beginDate == null) {
180                 return endDate;
181             }
182             if (endDate == null) {
183                 return beginDate;
184             }
185             if (beginDate.after(endDate)) {
186                 return endDate;
187             }
188             return beginDate;
189         }
190      //返回某月该季度的第一个月
191      public static Date getFirstSeasonDate(Date date) {
192              final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };
193             Calendar cal = Calendar.getInstance();
194             cal.setTime(date);
195             int sean = SEASON[cal.get(Calendar.MONTH)];
196             cal.set(Calendar.MONTH, sean * 3 - 3);
197             return cal.getTime();
198         }
199      //返回某个日期下几天的日期
200      public static Date getNextDay(Date date, int i) {
201             Calendar cal = new GregorianCalendar();
202             cal.setTime(date);
203             cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
204             return cal.getTime();
205         }
206      //返回某个日期前几天的日期
207      public static Date getFrontDay(Date date, int i) {
208             Calendar cal = new GregorianCalendar();
209             cal.setTime(date);
210             cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
211             return cal.getTime();
212         }
213      //获取某年某月到某年某月按天的切片日期集合（间隔天数的日期集合）
214      public static List getTimeList(int beginYear, int beginMonth, int endYear,
215                 int endMonth, int k) {
216             List list = new ArrayList();
217             if (beginYear == endYear) {
218                 for (int j = beginMonth; j <= endMonth; j++) {
219                     list.add(getTimeList(beginYear, j, k));
220
221                 }
222             } else {
223                 {
224                     for (int j = beginMonth; j < 12; j++) {
225                         list.add(getTimeList(beginYear, j, k));
226                     }
227
228                     for (int i = beginYear + 1; i < endYear; i++) {
229                         for (int j = 0; j < 12; j++) {
230                             list.add(getTimeList(i, j, k));
231                         }
232                     }
233                     for (int j = 0; j <= endMonth; j++) {
234                         list.add(getTimeList(endYear, j, k));
235                     }
236                 }
237             }
238             return list;
239         }
240      //获取某年某月按天切片日期集合（某个月间隔多少天的日期集合）
241      public static List getTimeList(int beginYear, int beginMonth, int k) {
242             List list = new ArrayList();
243             Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
244             int max = begincal.getActualMaximum(Calendar.DATE);
245             for (int i = 1; i < max; i = i + k) {
246                 list.add(begincal.getTime());
247                 begincal.add(Calendar.DATE, k);
248             }
249             begincal = new GregorianCalendar(beginYear, beginMonth, max);
250             list.add(begincal.getTime());
251             return list;
252         }
253 }

1 //获取某年某月的第一天日期
2  public static Date getStartMonthDate(int year, int month) {
3         Calendar calendar = Calendar.getInstance();
4         calendar.set(year, month - 1, 1);
5         return calendar.getTime();
6     }
7
8 //获取某年某月的最后一天日期
9    public static Date getEndMonthDate(int year, int month) {
10         Calendar calendar = Calendar.getInstance();
11         calendar.set(year, month - 1, 1);
12         int day = calendar.getActualMaximum(5);
13         calendar.set(year, month - 1, day);
14         return calendar.getTime();
15     }