1 package com.xm.utils;
2
3 import java.text.DateFormat;
4 import java.text.SimpleDateFormat;
5 import java.util.Calendar;
6 import java.util.Date;
7 import java.util.GregorianCalendar;
8 import java.util.Locale;
9 import java.util.TimeZone;
10
11 /**
12 * 时间处理工具
13 *
14 * @author xiaotangai
15 *
16 * @date 2016年8月13日上午8:52:50
17 */
18 public class DateUtil {
19
20 private static System system;
21 private static Date date;
22 private static Calendar calendar;
23 private static TimeZone timeZone;
24 private static Locale locale;
25 private static GregorianCalendar gregorianCalendar;
26
27 private static DateFormat dateFormat;
28 private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat();
29
30 private static java.sql.Date sqlDate;
31 private static java.sql.Time time;
32 private static java.sql.Timestamp timestamp;
33
34 /**
35 * 获得当前时间的方法种 最基本的还是 System.currentTimeMillis() 格林威治标准时间
36 * "1970-01-01 00:00:00.000 GMT"
37 */
38
39 /**
40 * 获得当前时间的方法1 System.currentTimeMillis()
41 *
42 * @return
43 */
44 public static long getCurrentTimeBySystem() {
45 return System.currentTimeMillis();
46 }
47
48 /**
49 * 获得当前时间的方法2 new Date()
50 *
51 * @return
52 */
53 public static Date getCurrentTimeByDate() {
54 return new Date();
55 }
56
57 /**
58 * 获得当前时间的方法3 Calendar.getInstance() 实质是 GregorianCalendar
59 *
60 * @return
61 */
62 public static Calendar getCurrentTimeByCalendar() {
63 return Calendar.getInstance();
64 }
65
66 /**
67 * 获得当前时间的方法4 new GregorianCalendar()
68 *
69 * @return
70 */
71 public static GregorianCalendar getCurrentTimeByGregorianCalendar() {
72 return new GregorianCalendar();
73 }
74
75 /**
76 * 比较两个时间
77 *
78 * @param d1
79 * @param d2
80 * @return 正数：d1>d2 0:d1=d2 负数：d1<d2
81 *
82 */
83 public static long compare(Date d1, Date d2) {
84 return d1.getTime() - d2.getTime();
85 }
86
87 /**
88 * 比较时间
89 *
90 * @param d1
91 * @param d2
92 * @return
93 */
94 public static boolean after(Date d1, Date d2) {
95 d1.after(d2);
96 return compare(d1, d2) > 0;
97 }
98
99 /**
100 *
101 * @param d1
102 * @param d2
103 * @return
104 */
105 public static boolean before(Date d1, Date d2) {
106 /* d1.before(d2); */
107 return compare(d1, d2) < 0;
108 }
109
110 /**
111 * 通过Calendar来获得时间的各个成分 如年，月，日有等
112 *
113 * @param d
114 * @param field
115 * @return
116 */
117 public static int getField(Date d, int field) {
118 Calendar c = Calendar.getInstance();
119 c.setTime(d);
120 return c.get(field);
121 }
122
123 /**
124 * 通过Calendar来设置时间的各个成分 如年，月，日有等
125 *
126 * @param d
127 * @param field
128 * @param value
129 * @return
130 */
131 public static Date setField(Date d, int field, int value) {
132 Calendar c = Calendar.getInstance();
133 c.setTime(d);
134 c.set(field, value);
135 return c.getTime();
136 }
137
138 /**
139 * 日期按成分增加
140 *
141 * @param d
142 * @param field
143 * @param amount
144 */
145 public static Date add(Date d, int field, int amount) {
146 Calendar c = Calendar.getInstance();
147 c.setTime(d);
148 c.add(field, amount);
149 return c.getTime();
150 }
151
152 /**
153 * 日期按成分减少
154 *
155 * @param d
156 * @param field
157 * @param amount
158 * @return
159 */
160 public static Date reduce(Date d, int field, int amount) {
161 return add(d, field, -amount);
162 }
163
164 /**
165 * 判断是否是闰年
166 *
167 * @param year
168 * @return
169 */
170 public static boolean isLeapYear(int year) {
171 if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
172 return true;
173 return false;
174 /* return new GregorianCalendar().isLeapYear(year); */
175 }
176
177 public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
178 public static final String DATE_PATTERN = "yyyy-MM-dd";
179 public static final String TIME_PATTERN = "HH:mm:ss";
180
181 /**
182 * 按格式格式化时间
183 *
184 * @param date
185 * @param pattern
186 * @return
187 */
188 public static String format(Date date, String pattern) {
189 if (null == simpleDateFormat) {
190 simpleDateFormat = new SimpleDateFormat();
191 }
192 simpleDateFormat.applyPattern(DATE_TIME_PATTERN);
193 return simpleDateFormat.format(date);
194 }
195
196 /**
197 * 按默认格式yyyy-MM-dd HH:mm:ss格式化时间
198 *
199 * @param date
200 * @return
201 */
202 public static String format(Date date) {
203 return format(date, DATE_TIME_PATTERN);
204 }
205
206 /**
207 * 格式化当前时间yyyy-MM-dd HH:mm:ss
208 *
209 * @return
210 */
211 public static String format() {
212 return format(new Date());
213 }
214
215 /**
216 * 获得月初
217 *
218 * @param d
219 * @return
220 */
221 public static Date getFirstDayofMonth(Date d) {
222 Calendar c = Calendar.getInstance();
223 c.setTime(d);
224 c.set(Calendar.DAY_OF_MONTH, 1);
225 c.set(Calendar.HOUR_OF_DAY, 0);
226 c.set(Calendar.MINUTE, 0);
227 c.set(Calendar.SECOND, 0);
228 c.set(Calendar.MILLISECOND, 0);
229 return c.getTime();
230 }
231
232 /**
233 * 获得月尾
234 *
235 * @param args
236 */
237 public static Date getLastDayofMonth(Date d) {
238 Calendar c = Calendar.getInstance();
239 c.setTime(d);
240 int month = c.get(Calendar.MONTH);
241 c.set(Calendar.MONDAY, month + 1);
242 c.set(Calendar.DAY_OF_MONTH, 1);
243 c.add(Calendar.DAY_OF_MONTH, -1);
244 c.set(Calendar.HOUR_OF_DAY, 23);
245 c.set(Calendar.MINUTE, 59);
246 c.set(Calendar.SECOND, 59);
247 c.set(Calendar.MILLISECOND, 999);
248 return c.getTime();
249 }
250
251 /**
252 * 获得本周星期一
253 *
254 * @param d
255 * @return
256 */
257 public static Date getMondayofWeek(Date d) {
258 Calendar c = Calendar.getInstance();
259 c.setTime(d);
260 int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
261 c.add(Calendar.DAY_OF_MONTH, 2 - dayOfWeek);
262 c.set(Calendar.HOUR_OF_DAY, 0);
263 c.set(Calendar.MINUTE, 0);
264 c.set(Calendar.SECOND, 0);
265 c.set(Calendar.MILLISECOND, 0);
266 return c.getTime();
267 }
268
269 /**
270 * 获得本周星期一
271 *
272 * @return
273 */
274 public static Date getMonday() {
275 Calendar c = Calendar.getInstance();
276 int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
277 c.add(Calendar.DAY_OF_MONTH, 2 - dayOfWeek);
278 c.set(Calendar.HOUR_OF_DAY, 0);
279 c.set(Calendar.MINUTE, 0);
280 c.set(Calendar.SECOND, 0);
281 c.set(Calendar.MILLISECOND, 0);
282 return c.getTime();
283 }
284
285 /**
286 * 获得本周星期日
287 *
288 * @param args
289 */
290 public static Date getSundayofWeek(Date d) {
291 Calendar c = Calendar.getInstance();
292 c.setTime(d);
293 int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
294 c.add(Calendar.DAY_OF_MONTH, (8 - dayOfWeek) % 7);
295 c.set(Calendar.HOUR_OF_DAY, 23);
296 c.set(Calendar.MINUTE, 59);
297 c.set(Calendar.SECOND, 59);
298 c.set(Calendar.MILLISECOND, 999);
299 return c.getTime();
300 }
301
302 /**
303 * 获得本周星期日 *
304 *
305 * @param args
306 */
307 public static Date getSunday() {
308 Calendar c = Calendar.getInstance();
309 int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
310 c.add(Calendar.DAY_OF_MONTH, (8 - dayOfWeek) % 7);
311 c.set(Calendar.HOUR_OF_DAY, 23);
312 c.set(Calendar.MINUTE, 59);
313 c.set(Calendar.SECOND, 59);
314 c.set(Calendar.MILLISECOND, 999);
315 return c.getTime();
316 }
317
318 public static void main(String[] args) {
319 Date d = new Date();
320 Calendar c = Calendar.getInstance();
321 System.out.println(System.currentTimeMillis());
322 System.out.println(d);
323 System.out.println(d.getTime());
324 System.out.println(c);
325 System.out.println(new GregorianCalendar());
326 System.out.println(isLeapYear(196));
327 System.out.println(format());
328 System.out.println(getFirstDayofMonth(d) + " " + getFirstDayofMonth(d).getTime());
329 System.out.println(getLastDayofMonth(d) + " " + getLastDayofMonth(d).getTime());
330 System.out.println(getMondayofWeek(d) + " " + getMondayofWeek(d).getTime());
331 System.out.println(getSundayofWeek(d) + " " + getSundayofWeek(d).getTime());
332 }
333
334 }
时间： 2024-12-24 07:21:49