这个想法源自于博客园的日历......
用户可以自定义打印某一年的年历，即：把某一年的日历全部打印出来
如把2013年的年历打印出来如下：
January 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Febuary 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 March 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 April 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 May 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Jun 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 July 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 August 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Septermber 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 October 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 November 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 December 2013 --------------------------------------------- Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
当然用户如果想单独打印某个月的日历，同样是可以实现的
如打印：2014年1月份的日历
日 一 二 三 四 五 六
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31
用户还可以实现打印当前的月份的日历
今天是：2013-04-27，则当前月份的日历打印如下：
日 一 二 三 四 五 六 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 :)27(: 28 29 30
是的，你没有看错，在27的那里有一个标志，表示是当天的日期.....
下面进入代码部分：
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代码部分：
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/UUUUUU_Test/src/com/b510/date/HongtenDate.java
1 /**
2 *
3 */
4 package com.b510.date;
5
6 import java.text.SimpleDateFormat;
7 import java.util.Calendar;
8 import java.util.Date;
9 import java.util.GregorianCalendar;
10
11 /**
12 * 一个日期处理类，在该类中，构造函数<code>HongtenDate()</code>,系统会默认设置年份为当年<br>
13 * 而<code>HongtenDate(int year)</code>,则可以自定义年份<br>
14 *
15 * <pre>
16 * HongtenDate date = new HongtenDate();
17 * </pre>
18 *
19 * or<br>
20 *
21 * <pre>
22 * HongtenDate hd = new HongtenDate(2014);
23 * </pre>
24 *
25 * 调用<code>printCalendar()</code>可以打印一年的日期<br>
26 * 调用<code>printCurrentMonth()</code>可以打印当前月的日期<br>
27 * ,当然，你也可以调用<br>
28 * <code>printMonthOfYear()</code>设置一个参数，进行打印某个月的日期<br>
29 * 这里提供一些参考方案:<br>
30 *
31 * <pre>
32 * // 无参数，系统默认去当前年份
33 * HongtenDate date = new HongtenDate();
34 * date.printCalendar();
35 * date.printCurrentMonth();
36 * date.printMonthOfYear(4);
37 * </pre>
38 *
39 * or<br>
40 *
41 * <pre>
42 * // 设置为2014年
43 * HongtenDate hd = new HongtenDate(2014);
44 * hd.printCurrentMonth();
45 * hd.printMonthOfYear(1);
46 * </pre>
47 *
48 * @date 2013-4-27
49 * @author hongten
50 *
51 */
52 public class HongtenDate {
53
54 // MONTHS
55 // ============================================
56 public static final String JANUARY = "January";
57 public static final String FEBUARY = "Febuary";
58 public static final String MARCH = "March";
59 public static final String APRIL = "April";
60 public static final String MAY = "May";
61 public static final String JUN = "Jun";
62 public static final String JULY = "July";
63 public static final String AUGUST = "August";
64 public static final String SEPTERMBER = "Septermber";
65 public static final String OCTOBER = "October";
66 public static final String NOVEMBER = "November";
67 public static final String DECEMBER = "December";
68
69 /**
70 * 年份
71 */
72 private int year;
73 /**
74 * 一月一日星期几(eg:2013-01-01-->星期二,所以<code>whatDayOnJanuaryOne = 2;</code>)
75 */
76 private int whatDayOnJanuaryOne;
77
78 // main
79 // ======================================
80 public static void main(String[] args) throws Exception {
81 // 无参数，系统默认去当前年份
82 HongtenDate date = new HongtenDate();
83 // date.printCalendar();
84 date.printCurrentMonth();
85 // date.printMonthOfYear(4);
86
87 // 设置为2014年
88 HongtenDate hd = new HongtenDate(2014);
89 // hd.printCurrentMonth();
90 // hd.printMonthOfYear(1);
91
92 }
93
94 // 无参数，系统默认去当前年份
95 public HongtenDate() {
96 Calendar cal = Calendar.getInstance();
97 this.year = cal.get(Calendar.YEAR);
98 try {
99 setWhatDayOnJanuaryOne(getJanuaryOne(year));
100 } catch (Exception e) {
101 e.printStackTrace();
102 }
103 }
104
105 // 有参数，设置年份
106 public HongtenDate(int year) {
107 this.year = year;
108 try {
109 setWhatDayOnJanuaryOne(getJanuaryOne(year));
110 } catch (Exception e) {
111 e.printStackTrace();
112 }
113 }
114
115 /**
116 * 打印某个月的所有日期
117 *
118 * @param mon
119 * 月份
120 * @throws Exception
121 */
122 public void printMonthOfYear(int mon) throws Exception {
123 if (mon < 1 || mon > 12) {
124 System.out.println("你输入的月份[" + mon + "]不对，请检查在进行....");
125 return;
126 }
127 GregorianCalendar now = new GregorianCalendar();
128 // 获得一个Date对象
129 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
130 Date date = sdf.parse(year + "-" + mon + "-01");
131 // 设置当前时间
132 now.setTime(date);
133 // 从日期中取得当前的月
134 int month = now.get(Calendar.MONTH);
135 // 设置now的日期为1
136 now.set(Calendar.DAY_OF_MONTH, 1);
137 // 得到now是一周的第几天
138 int week = now.get(Calendar.DAY_OF_WEEK);
139 // 打印日历头部标示
140 System.out.println("日\t一\t二\t三\t四\t五\t六");
141 // 打印当前日期前面的空格
142 for (int i = Calendar.SUNDAY; i < week; i++) {
143 System.out.print("\t");
144 }
145 // 打印日历主体
146 while (now.get(Calendar.MONTH) == month) {
147 int day = now.get(Calendar.DAY_OF_MONTH);
148 // 对输出的日历进行对齐，小于10的加上一个空格
149 if (day < 10) {
150 System.out.print(" " + day + "\t");
151 } else {
152 System.out.print("" + day + "\t");
153 }
154 // 如果是周六，进行换行
155 if (week == Calendar.SATURDAY) {
156 System.out.println();
157 }
158 // 每次输出日期后，将日期增加一天
159 now.add(Calendar.DAY_OF_MONTH, 1);
160 // 重新获得一周的第几天
161 week = now.get(Calendar.DAY_OF_WEEK);
162 }
163 }
164
165 /**
166 * 打印当前月的所有日期，这个不会因用户设置的年份而改变
167 */
168 public void printCurrentMonth() {
169 GregorianCalendar now = new GregorianCalendar();
170 // 获得一个Date对象
171 Date date = new Date();
172 // 设置当前时间
173 now.setTime(date);
174 // 从日期中取得当前的日
175 int toDay = now.get(Calendar.DAY_OF_MONTH);
176 // 从日期中取得当前的月
177 int month = now.get(Calendar.MONTH);
178 // 设置now的日期为1
179 now.set(Calendar.DAY_OF_MONTH, 1);
180 // 得到now是一周的第几天
181 int week = now.get(Calendar.DAY_OF_WEEK);
182 // 打印日历头部标示
183 System.out.println("日\t一\t二\t三\t四\t五\t六");
184 // 打印当前日期前面的空格
185 for (int i = Calendar.SUNDAY; i < week; i++) {
186 System.out.print("\t");
187 }
188 // 打印日历主体
189 while (now.get(Calendar.MONTH) == month) {
190 int day = now.get(Calendar.DAY_OF_MONTH);
191 // 对输出的日历进行对齐，小于10的加上一个空格
192 if (day < 10) {
193 // 如果是当前日期，加上标示
194 if (day == toDay) {
195 System.out.print(":)" + day + "(:\t");
196 } else {
197 System.out.print(" " + day + "\t");
198 }
199 } else {
200 // 如果是当前日期，加上标示
201 if (day == toDay) {
202 System.out.print(":)" + day + "(:\t");
203 } else {
204 System.out.print("" + day + "\t");
205 }
206 }
207 // 如果是周六，进行换行
208 if (week == Calendar.SATURDAY) {
209 System.out.println();
210 }
211 // 每次输出日期后，将日期增加一天
212 now.add(Calendar.DAY_OF_MONTH, 1);
213 // 重新获得一周的第几天
214 week = now.get(Calendar.DAY_OF_WEEK);
215 }
216 }
217
218 /**
219 * 获取year这一年的一月一号是星期几
220 *
221 * @param year
222 * 年份
223 * @return
224 * @throws Exception
225 */
226 public int getJanuaryOne(int year) throws Exception {
227 int[] weekDays = { 0, 1, 2, 3, 4, 5, 6 };
228 Calendar cal = Calendar.getInstance();
229 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
230 Date dt = sdf.parse(year + "-01-01");
231 cal.setTime(dt);
232 int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
233 if (w < 0)
234 w = 0;
235 return weekDays[w];
236 }
237
238 /**
239 * 打印一年的所有月份
240 */
241 public void printCalendar() {
242 for (int i = 1; i <= 12; i++) {
243 String month = getMonth(i);
244 printTitle(month);
245 // 打印有31天的月份
246 if (i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12) {
247 print31();
248 }
249 // 打印有30天的月份
250 else if (i == 4 || i == 6 || i == 9 || i == 11) {
251 print30();
252 }
253 // 打印二月份
254 else if (i == 2) {
255 printFebuary();
256 }
257 System.out.println();
258 }
259 }
260
261 // 打印格式
262 // ============================================== start
263 /**
264 * 打印二月份，每一年的二月份可能不相同，所以要单独处理
265 */
266 protected void printFebuary() {
267 if (this.year % 4 == 0) {
268 // 闰年
269 printLeapYear();
270 } else {
271 // 平年
272 printNonleapYear();
273 }
274 }
275
276 /**
277 * 闰年二月份打印格式
278 */
279 private void printLeapYear() {
280 for (int j = 1; j <= 29; j++) {
281 String tmp = "";
282 if (j == 1) {
283 for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) {
284 tmp = tmp + " ";
285 }
286 tmp = tmp + " " + j + " ";
287 if (this.whatDayOnJanuaryOne == 6) {
288 System.out.println(tmp);
289 } else {
290 System.out.print(tmp);
291 }
292 } else if (j > 1 && j < 29) {
293
294 if ((this.whatDayOnJanuaryOne + j) % 7 == 0) {
295 System.out.println(" " + j);
296 } else {
297 if (j < 10) {
298 System.out.print(" " + j + " ");
299 } else {
300 System.out.print(" " + j + " ");
301 }
302 }
303 } else if (j == 29) {
304 System.out.println(" " + j);
305 this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7);
306 }
307 }
308 }
309
310 /**
311 * 打印平年二月份格式
312 */
313 private void printNonleapYear() {
314 for (int j = 1; j <= 28; j++) {
315 String tmp = "";
316 if (j == 1) {
317 for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) {
318 tmp = tmp + " ";
319 }
320 tmp = tmp + " " + j + " ";
321 if (this.whatDayOnJanuaryOne == 6) {
322 System.out.println(tmp);
323 } else {
324 System.out.print(tmp);
325 }
326 } else if (j > 1 && j < 28) {
327
328 if ((this.whatDayOnJanuaryOne + j) % 7 == 0) {
329 System.out.println(" " + j);
330 } else {
331 if (j < 10) {
332 System.out.print(" " + j + " ");
333 } else {
334 System.out.print(" " + j + " ");
335 }
336 }
337 } else if (j == 28) {
338 System.out.println(" " + j);
339 this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7);
340 }
341 }
342 }
343
344 /**
345 * 打印有30天的月份
346 */
347 protected void print30() {
348 for (int j = 1; j <= 30; j++) {
349 String tmp = "";
350 if (j == 1) {
351 for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) {
352 tmp = tmp + " ";
353 }
354 tmp = tmp + " " + j + " ";
355 if (this.whatDayOnJanuaryOne == 6) {
356 System.out.println(tmp);
357 } else {
358 System.out.print(tmp);
359 }
360 } else if (j > 1 && j < 30) {
361
362 if ((this.whatDayOnJanuaryOne + j) % 7 == 0) {
363 System.out.println(" " + j);
364 } else {
365 if (j < 10) {
366 System.out.print(" " + j + " ");
367 } else {
368 System.out.print(" " + j + " ");
369 }
370 }
371 } else if (j == 30) {
372 System.out.println(" " + j);
373 this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7);
374 }
375 }
376 }
377
378 /**
379 * 打印有31天的月份
380 */
381 protected void print31() {
382 for (int j = 1; j <= 31; j++) {
383 String tmp = "";
384 if (j == 1) {
385 for (int k = 1; k <= this.whatDayOnJanuaryOne % 7; k++) {
386 tmp = tmp + " ";
387 }
388 tmp = tmp + " " + j + " ";
389 if (this.whatDayOnJanuaryOne == 6) {
390 System.out.println(tmp);
391 } else {
392 System.out.print(tmp);
393 }
394 } else if (j > 1 && j < 31) {
395
396 if ((this.whatDayOnJanuaryOne + j) % 7 == 0) {
397 System.out.println(" " + j);
398 } else {
399 if (j < 10) {
400 System.out.print(" " + j + " ");
401 } else {
402 System.out.print(" " + j + " ");
403 }
404 }
405 } else if (j == 31) {
406 System.out.println(" " + j);
407 this.whatDayOnJanuaryOne = ((this.whatDayOnJanuaryOne + j) % 7);
408 }
409 }
410 }
411
412 /**
413 * 打印每个月的标题
414 *
415 * @param month
416 */
417 protected void printTitle(String month) {
418 System.out.println(" " + month + " " + this.year + " ");
419 System.out.println("---------------------------------------------");
420 System.out.println(" Sun Mon Tue Wed Thu Fri Sat");
421 }
422
423 // 打印格式
424 // ============================================== end
425
426 /**
427 * 获取月份的英文名称
428 *
429 * @param m
430 * 月份的数字表示
431 * @return
432 */
433 public String getMonth(int m) {
434 String month = "";
435 switch (m) {
436 case 1:
437 month = JANUARY;
438 break;
439 case 2:
440 month = FEBUARY;
441 break;
442