liferay常用api总结

liferay之笑傲江湖学习笔记《一》
我们大家都知道，想要在一项技术上过硬，你需要付出汗水的，需要闭门修炼，每一个成功的人，都是那种耐得住寂寞的人，好了闲话少说。开始学习之旅
在liferay中在网上搜索了一些人的总结的经验，下面就是自己消化的结果。
首先哪一个简单的StringUtil这个类来说事，这个是liferay中的源代码

public class StringUtil {
043
044 public static String add(String s, String add) {
045 return add(s, add, StringPool.COMMA);
046 }
047
048 public static String add(String s, String add, String delimiter) {
049 return add(s, add, delimiter, false);
050 }
051
052 public static String add(
053 String s, String add, String delimiter, boolean allowDuplicates) {
054
055 if ((add == null) || (delimiter == null)) {
056 return null;
057 }
058
059 if (s == null) {
060 s = StringPool.BLANK;
061 }
062
063 if (allowDuplicates || !contains(s, add, delimiter)) {
064 StringBundler sb = new StringBundler();
065
066 sb.append(s);
067
068 if (Validator.isNull(s) || s.endsWith(delimiter)) {
069 sb.append(add);
070 sb.append(delimiter);
071 }
072 else {
073 sb.append(delimiter);
074 sb.append(add);
075 sb.append(delimiter);
076 }
077
078 s = sb.toString();
079 }
080
081 return s;
082 }
083
084 public static String bytesToHexString(byte[] bytes) {
085 StringBuilder sb = new StringBuilder(bytes.length * 2);
086
087 for (int i = 0; i < bytes.length; i++) {
088 String hex = Integer.toHexString(
089 0x0100 + (bytes[i] & 0x00FF)).substring(1);
090
091 if (hex.length() < 2) {
092 sb.append("0");
093 }
094
095 sb.append(hex);
096 }
097
098 return sb.toString();
099 }
100
101 public static boolean contains(String s, String text) {
102 return contains(s, text, StringPool.COMMA);
103 }
104
105 public static boolean contains(String s, String text, String delimiter) {
106 if ((s == null) || (text == null) || (delimiter == null)) {
107 return false;
108 }
109
110 if (!s.endsWith(delimiter)) {
111 s = s.concat(delimiter);
112 }
113
114 String dtd = delimiter.concat(text).concat(delimiter);
115
116 int pos = s.indexOf(dtd);
117
118 if (pos == -1) {
119 String td = text.concat(delimiter);
120
121 if (s.startsWith(td)) {
122 return true;
123 }
124
125 return false;
126 }
127
128 return true;
129 }
130
131 public static int count(String s, String text) {
132 if ((s == null) || (text == null)) {
133 return 0;
134 }
135
136 int count = 0;
137
138 int pos = s.indexOf(text);
139
140 while (pos != -1) {
141 pos = s.indexOf(text, pos + text.length());
142
143 count++;
144 }
145
146 return count;
147 }
148
149 public static boolean endsWith(String s, char end) {
150 return endsWith(s, (new Character(end)).toString());
151 }
152
153 public static boolean endsWith(String s, String end) {
154 if ((s == null) || (end == null)) {
155 return false;
156 }
157
158 if (end.length() > s.length()) {
159 return false;
160 }
161
162 String temp = s.substring(s.length() - end.length(), s.length());
163
164 if (temp.equalsIgnoreCase(end)) {
165 return true;
166 }
167 else {
168 return false;
169 }
170 }
171
172 public static String extractChars(String s) {
173 if (s == null) {
174 return StringPool.BLANK;
175 }
176
177 StringBuilder sb = new StringBuilder();
178
179 char[] charArray = s.toCharArray();
180
181 for (int i = 0; i < charArray.length; i++) {
182 if (Validator.isChar(charArray[i])) {
183 sb.append(charArray[i]);
184 }
185 }
186
187 return sb.toString();
188 }
189
190 public static String extractDigits(String s) {
191 if (s == null) {
192 return StringPool.BLANK;
193 }
194
195 StringBuilder sb = new StringBuilder();
196
197 char[] charArray = s.toCharArray();
198
199 for (int i = 0; i < charArray.length; i++) {
200 if (Validator.isDigit(charArray[i])) {
201 sb.append(charArray[i]);
202 }
203 }
204
205 return sb.toString();
206 }
207
208 public static String extractFirst(String s, String delimiter) {
209 if (s == null) {
210 return null;
211 }
212 else {
213 String[] array = split(s, delimiter);
214
215 if (array.length > 0) {
216 return array[0];
217 }
218 else {
219 return null;
220 }
221 }
222 }
223
224 public static String extractLast(String s, String delimiter) {
225 if (s == null) {
226 return null;
227 }
228 else {
229 String[] array = split(s, delimiter);
230
231 if (array.length > 0) {
232 return array[array.length - 1];
233 }
234 else {
235 return null;
236 }
237 }
238 }
239
240 /**
241 * @deprecated
242 */
243 public static String highlight(String s, String keywords) {
244 return highlight(s, keywords, "<span class=\"highlight\">", "</span>");
245 }
246
247 /**
248 * @deprecated
249 */
250 public static String highlight(
251 String s, String keywords, String highlight1, String highlight2) {
252
253 if (Validator.isNull(s) || Validator.isNull(keywords)) {
254 return s;
255 }
256
257 Pattern pattern = Pattern.compile(
258 Pattern.quote(keywords), Pattern.CASE_INSENSITIVE);
259
260 return _highlight(s, pattern, highlight1, highlight2);
261 }
262
263 public static String highlight(String s, String[] queryTerms) {
264 return highlight(
265 s, queryTerms, "<span class=\"highlight\">", "</span>");
266 }
267
268 public static String highlight(
269 String s, String[] queryTerms, String highlight1, String highlight2) {
270
271 if (Validator.isNull(s) || Validator.isNull(queryTerms)) {
272 return s;
273 }
274
275 StringBundler sb = null;
276
277 if (queryTerms.length == 0) {
278 sb = new StringBundler();
279 }
280 else {
281 sb = new StringBundler(2 * queryTerms.length - 1);
282 }
283
284 for (int i = 0; i < queryTerms.length; i++) {
285 sb.append(Pattern.quote(queryTerms[i].trim()));
286
287 if ((i + 1) < queryTerms.length) {
288 sb.append(StringPool.PIPE);
289 }
290 }
291
292 int flags =
293 Pattern.CANON_EQ | Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE;
294
295 Pattern pattern = Pattern.compile(sb.toString(), flags);
296
297 return _highlight(s, pattern, highlight1, highlight2);
298 }
299
300 public static String insert(String s, String insert, int offset) {
301 if (s == null) {
302 return null;
303 }
304
305 if (insert == null) {
306 return s;
307 }
308
309 if (offset > s.length()) {
310 offset = s.length();
311 }
312
313 StringBuilder sb = new StringBuilder(s);
314
315 sb.insert(offset, insert);
316
317 return sb.toString();
318 }
319
320 public static String lowerCase(String s) {
321 if (s == null) {
322 return null;
323 }
324 else {
325 return s.toLowerCase();
326 }
327 }
328
329 public static boolean matches(String s, String pattern) {
330 String[] array = pattern.split("\\*");
331
332 for (int i = 0; i < array.length; i++) {
333 int pos = s.indexOf(array[i]);
334
335 if (pos == -1) {
336 return false;
337 }
338
339 s = s.substring(pos + array[i].length());
340 }
341
342 return true;
343 }
344
345 public static String merge(boolean[] array) {
346 return merge(array, StringPool.COMMA);
347 }
348
349 public static String merge(boolean[] array, String delimiter) {
350 if (array == null) {
351 return null;
352 }
353
354 StringBundler sb = null;
355
356 if (array.length == 0) {
357 sb = new StringBundler();
358 }
359 else {
360 sb = new StringBundler(2 * array.length - 1);
361 }
362
363 for (int i = 0; i < array.length; i++) {
364 sb.append(String.valueOf(array[i]).trim());
365
366 if ((i + 1) != array.length) {
367 sb.append(delimiter);
368 }
369 }
370
371 return sb.toString();
372 }
373
374 public static String merge(Collection<?> col) {
375 return merge(col, StringPool.COMMA);
376 }
377
378 public static String merge(Collection<?> col, String delimiter) {
379 if (col == null) {
380 return null;
381 }
382
383 return merge(col.toArray(new Object[col.size()]), delimiter);
384 }
385
386 public static String merge(double[] array) {
387 return merge(array, StringPool.COMMA);
388 }
389
390 public static String merge(double[] array, String delimiter) {
391 if (array == null) {
392 return null;
393 }
394
395 StringBundler sb = null;
396
397 if (array.length == 0) {
398 sb = new StringBundler();
399 }
400 else {
401 sb = new StringBundler(2 * array.length - 1);
402 }
403
404 for (int i = 0; i < array.length; i++) {
405 sb.append(String.valueOf(array[i]).trim());
406
407 if ((i + 1) != array.length) {
408 sb.append(delimiter);
409 }
410 }
411
412 return sb.toString();
413 }
414
415 public static String merge(float[] array) {
416 return merge(array, StringPool.COMMA);
417 }
418
419 public static String merge(float[] array, String delimiter) {
420 if (array == null) {
421 return null;
422 }
423
424 StringBundler sb = null;
425
426 if (array.length == 0) {
427 sb = new StringBundler();
428 }
429 else {
430 sb = new StringBundler(2 * array.length - 1);
431 }
432
433 for (int i = 0; i < array.length; i++) {
434 sb.append(String.valueOf(array[i]).trim());
435
436 if ((i + 1) != array.length) {
437 sb.append(delimiter);
438 }
439 }
440
441 return sb.toString();
442 }
443
444 public static String merge(int[] array) {
445 return merge(array, StringPool.COMMA);
446 }
447
448 public static String merge(int[] array, String delimiter) {
449 if (array == null) {
450 return null;
451 }
452
453 StringBundler sb = null;
454
455 if (array.length == 0){
456 sb = new StringBundler();
457 }
458 else {
459 sb = new StringBundler(2 * array.length - 1);
460 }
461
462 for (int i = 0; i < array.length; i++) {
463 sb.append(String.valueOf(array[i]).trim());
464
465 if ((i + 1) != array.length) {
466 sb.append(delimiter);
467 }
468 }
469
470 return sb.toString();
471 }
472
473 public static String merge(long[] array) {
474 return merge(array, StringPool.COMMA);
475 }
476
477 public static String merge(long[] array, String delimiter) {
478 if (array == null) {
479 return null;
480 }
481
482 StringBundler sb = null;
483
484 if (array.length == 0) {
485 sb = new StringBundler();
486 }
487 else {
488 sb = new StringBundler(2 * array.length - 1);
489 }
490
491 for (int i = 0; i < array.length; i++) {
492 sb.append(String.valueOf(array[i]).trim());
493
494 if ((i + 1) != array.length) {
495 sb.append(delimiter);
496 }
497 }
498
499 return sb.toString();
500 }
501
502 public static String merge(Object[] array) {
503 return merge(array, StringPool.COMMA);
504 }
505
506 public static String merge(Object[] array, String delimiter) {
507 if (array == null) {
508 return null;
509 }
510
511 StringBundler sb = null;
512
513 if (array.length == 0) {
514 sb = new StringBundler();
515 }
516 else {
517 sb = new StringBundler(2 * array.length - 1);
518 }
519
520 for (int i = 0; i < array.length; i++) {
521 sb.append(String.valueOf(array[i]).trim());
522
523 if ((i + 1) != array.length) {
524 sb.append(delimiter);
525 }
526 }
527
528 return sb.toString();
529 }
530
531 public static String merge(short[] array) {
532 return merge(array, StringPool.COMMA);
533 }
534
535 public static String merge(short[] array, String delimiter) {
536 if (array == null) {
537 return null;
538 }
539
540 StringBundler sb = null;
541
542 if (array.length == 0) {
543 sb = new StringBundler();
544 }
545 else {
546 sb = new StringBundler(2 * array.length - 1);
547 }
548
549 for (int i = 0; i < array.length; i++) {
550 sb.append(String.valueOf(array[i]).trim());
551
552 if ((i + 1) != array.length) {
553 sb.append(delimiter);
554 }
555 }
556
557 return sb.toString();
558 }
559
560 public static String randomize(String s) {
561 return Randomizer.getInstance().randomize(s);
562 }
563
564 public static String read(ClassLoader classLoader, String name)
565 throws IOException {
566
567 return read(classLoader, name, false);
568 }
569
570 public static String read(ClassLoader classLoader, String name, boolean all)
571 throws IOException {
572
573 if (all) {
574 StringBundler sb = new StringBundler();
575
576 Enumeration<URL> enu = classLoader.getResources(name);
577
578 while (enu.hasMoreElements()) {
579 URL url = enu.nextElement();
580
581 InputStream is = url.openStream();
582
583 if (is == null) {
584 throw new IOException(
585 "Unable to open resource at " + url.toString());
586 }
587
588 String s = read(is);
589
590 if (s != null) {
591 sb.append(s);
592 sb.append(StringPool.NEW_LINE);
593 }
594
595 is.close();
596 }
597
598 return sb.toString().trim();
599 }
600 else {
601 InputStream is = classLoader.getResourceAsStream(name);
602
603 if (is == null) {
604 throw new IOException(
605 "Unable to open resource in class loader " + name);
606 }
607
608 String s = read(is);
609
610 is.close();
611
612 return s;
613 }
614 }
615
616 public static String read(InputStream is) throws IOException {
617 StringBundler sb = new StringBundler();
618
619 UnsyncBufferedReader unsyncBufferedReader = new UnsyncBufferedReader(
620 new InputStreamReader(is));
621
622 String line = null;
623
624 while ((line = unsyncBufferedReader.readLine()) != null) {
625 sb.append(line);
626 sb.append(CharPool.NEW_LINE);
627 }
628
629 unsyncBufferedReader.close();
630
631 return sb.toString().trim();
632 }
633
634 public static String remove(String s, String remove) {
635 return remove(s, remove, StringPool.COMMA);
636 }
637
638 public static String remove(String s, String remove, String delimiter) {
639 if ((s == null) || (remove == null) || (delimiter == null)) {
640 return null;
641 }
642
643 if (Validator.isNotNull(s) && !s.endsWith(delimiter)) {
644 s += delimiter;
645 }
646
647 String drd = delimiter.concat(remove).concat(delimiter);
648
649 String rd = remove.concat(delimiter);
650
651 while (contains(s, remove, delimiter)) {
652 int pos = s.indexOf(drd);
653
654 if (pos == -1) {
655 if (s.startsWith(rd)) {
656 int x = remove.length() + delimiter.length();
657 int y = s.length();
658
659 s = s.substring(x, y);
660 }
661 }
662 else {
663 int x = pos + remove.length() + delimiter.length();
664 int y = s.length();
665
666 String temp = s.substring(0, pos);
667
668 s = temp.concat(s.substring(x, y));
669 }
670 }
671
672 return s;
673 }
674
675 public static String replace(String s, char oldSub, char newSub) {
676 if (s == null) {
677 return null;
678 }
679
680 return s.replace(oldSub, newSub);
681 }
682
683 public static String replace(String s, char oldSub, String newSub) {
684 if ((s == null) || (newSub == null)) {
685 return null;
686 }
687
688 // The number 5 is arbitrary and is used as extra padding to reduce
689 // buffer expansion
690
691 StringBuilder sb = new StringBuilder(s.length() + 5 * newSub.length());
692
693 char[] charArray = s.toCharArray();
694
695 for (char c : charArray) {
696 if (c == oldSub) {
697 sb.append(newSub);
698 }
699 else {
700 sb.append(c);
701 }
702 }
703
704 return sb.toString();
705 }
706
707 public static String replace(String s, String oldSub, String newSub) {
708 return replace(s, oldSub, newSub, 0);
709 }
710
711 public static String replace(
712 String s, String oldSub, String newSub, int fromIndex) {
713
714 if ((s == null) || (oldSub == null) || (newSub == null)) {
715 return null;
716 }
717
718 int y = s.indexOf(oldSub, fromIndex);
719
720 if (y >= 0) {
721 StringBundler sb = new StringBundler();
722
723 int length = oldSub.length();
724 int x = 0;
725
726 while (x <= y) {
727 sb.append(s.substring(x, y));
728 sb.append(newSub);
729
730 x = y + length;
731 y = s.indexOf(oldSub, x);
732 }
733
734 sb.append(s.substring(x));
735
736 return sb.toString();
737 }
738 else {
739 return s;
740 }
741 }
742
743 public static String replace(
744 String s, String begin, String end, Map<String, String> values) {
745
746 StringBundler sb = replaceToStringBundler(s, begin, end, values);
747
748 return sb.toString();
749 }
750
751 public static String replace(String s, String[] oldSubs, String[] newSubs) {
752 if ((s == null) || (oldSubs == null) || (newSubs == null)) {
753 return null;
754 }
755
756 if (oldSubs.length != newSubs.length) {
757 return s;
758 }
759
760 for (int i = 0; i < oldSubs.length; i++) {
761 s = replace(s, oldSubs[i], newSubs[i]);
762 }
763
764 return s;
765 }
766
767 public static String replace(
768 String s, String[] oldSubs, String[] newSubs, boolean exactMatch) {
769
770 if ((s == null) || (oldSubs == null) || (newSubs == null)) {
771 return null;
772 }
773
774 if (oldSubs.length != newSubs.length) {
775 return s;
776 }
777
778 if (!exactMatch) {
779 replace(s, oldSubs, newSubs);
780 }
781 else {
782 for (int i = 0; i < oldSubs.length; i++) {
783 s = s.replaceAll("\\b" + oldSubs[i] + "\\b" , newSubs[i]);
784 }
785 }
786
787 return s;
788 }
789
790 public static String replaceFirst(String s, char oldSub, char newSub) {
791 if (s == null) {
792 return null;
793 }
794
795 return s.replaceFirst(String.valueOf(oldSub), String.valueOf(newSub));
796 }
797
798 public static String replaceFirst(String s, char oldSub, String newSub) {
799 if ((s == null) || (newSub == null)) {
800 return null;
801 }
802
803 return s.replaceFirst(String.valueOf(oldSub), newSub);
804 }
805
806 public static String replaceFirst(String s, String oldSub, String newSub) {
807 if ((s == null) || (oldSub == null) || (newSub == null)) {
808 return null;
809 }
810
811 return s.replaceFirst(oldSub, newSub);
812 }
813
814 public static String replaceFirst(
815 String s, String[] oldSubs, String[] newSubs) {
816
817 if ((s == null) || (oldSubs == null) || (newSubs == null)) {
818 return null;
819 }
820
821 if (oldSubs.length != newSubs.length) {
822 return s;
823 }
824
825 for (int i = 0; i < oldSubs.length; i++) {
826 s = replaceFirst(s, oldSubs[i], newSubs[i]);
827 }
828
829 return s;
830 }
831
832 public static String replaceLast(String s, char oldSub, char newSub) {
833 if (s == null) {
834 return null;
835 }
836
837 return replaceLast(s, String.valueOf(oldSub), String.valueOf(newSub));
838 }
839
840 public static String replaceLast(String s, char oldSub, String newSub) {
841 if ((s == null) || (newSub == null)) {
842 return null;
843 }
844
845 return replaceLast(s, String.valueOf(oldSub), newSub);
846 }
847
848 public static String replaceLast(String s, String oldSub, String newSub) {
849 if ((s == null) || (oldSub == null) || (newSub == null)) {
850 return null;
851 }
852
853 int y = s.lastIndexOf(oldSub);
854
855 if (y >= 0) {
856 StringBundler sb = new StringBundler();
857
858 int length = oldSub.length();
859 int x = 0;
860
861 while (x <= y) {
862 sb.append(s.substring(x, y));
863 sb.append(newSub);
864
865 x = y + length;
866 y = s.indexOf(oldSub, x);
867 }
868
869 sb.append(s.substring(x));
870
871 return sb.toString();
872 }
873 else {
874 return s;
875 }
876 }
877
878 public static String replaceLast(
879 String s, String[] oldSubs, String[] newSubs) {
880
881 if ((s == null) || (oldSubs == null) || (newSubs == null)) {
882 return null;
883 }
884
885 if (oldSubs.length != newSubs.length) {
886 return s;
887 }
888
889 for (int i = 0; i < oldSubs.length; i++) {
890 s = replaceLast(s, oldSubs[i], newSubs[i]);
891 }
892
893 return s;
894 }
895
896 public static StringBundler replaceToStringBundler(
897 String s, String begin, String end, Map<String, String> values) {
898
899 if ((s == null) || (begin == null) || (end == null) ||
900 (values == null) || (values.size() == 0)) {
901
902 return new StringBundler(s);
903 }
904
905 StringBundler sb = new StringBundler(values.size() * 2 + 1);
906
907 int pos = 0;
908
909 while (true) {
910 int x = s.indexOf(begin, pos);
911 int y = s.indexOf(end, x + begin.length());
912
913 if ((x == -1) || (y == -1)) {
914 sb.append(s.substring(pos, s.length()));
915
916 break;
917 }
918 else {
919 sb.append(s.substring(pos, x));
920
921 String oldValue = s.substring(x + begin.length(), y);
922
923 String newValue = values.get(oldValue);
924
925 if (newValue == null) {
926 newValue = oldValue;
927 }
928
929 sb.append(newValue);
930
931 pos = y + end.length();
932 }
933 }
934
935 return sb;
936 }
937
938 public static StringBundler replaceWithStringBundler(
939 String s, String begin, String end, Map<String, StringBundler> values) {
940
941 if ((s == null) || (begin == null) || (end == null) ||
942 (values == null) || (values.size() == 0)) {
943
944 return new StringBundler(s);
945 }
946
947 int size = values.size() + 1;
948
949 for (StringBundler valueSB : values.values()) {
950 size += valueSB.index();
951 }
952
953 StringBundler sb = new StringBundler(size);
954
955 int pos = 0;
956
957 while (true) {
958 int x = s.indexOf(begin, pos);
959 int y = s.indexOf(end, x + begin.length());
960
961 if ((x == -1) || (y == -1)) {
962 sb.append(s.substring(pos, s.length()));
963
964 break;
965 }
966 else {
967 sb.append(s.substring(pos, x));
968
969 String oldValue = s.substring(x + begin.length(), y);
970
971 StringBundler newValue = values.get(oldValue);
972
973 if (newValue == null) {
974 sb.append(oldValue);
975 }
976 else {
977 sb.append(newValue);
978 }
979
980 pos = y + end.length();
981 }
982 }
983
984 return sb;
985 }
986
987 public static String reverse(String s) {
988 if (s == null) {
989 return null;
990 }
991
992 char[] charArray = s.toCharArray();
993 char[] reverse = new char[charArray.length];
994
995 for (int i = 0; i < charArray.length; i++) {
996 reverse[i] = charArray[charArray.length - i - 1];
997 }
998
999 return new String(reverse);
1000 }
1001
1002 public static String safePath(String path) {
1003 return replace(path, StringPool.DOUBLE_SLASH, StringPool.SLASH);
1004 }
1005
1006 public static String shorten(String s) {
1007 return shorten(s, 20);
1008 }
1009
1010 public static String shorten(String s, int length) {
1011 return shorten(s, length, "...");
1012 }
1013
1014 public static String shorten(String s, int length, String suffix) {
1015 if ((s == null) || (suffix == null)) {
1016 return null;
1017 }
1018
1019 if (s.length() > length) {
1020 for (int j = length; j >= 0; j--) {
1021 if (Character.isWhitespace(s.charAt(j))) {
1022 length = j;
1023
1024 break;
1025 }
1026 }
1027
1028 String temp = s.substring(0, length);
1029
1030 s = temp.concat(suffix);
1031 }
1032
1033 return s;
1034 }
1035
1036 public static String shorten(String s, String suffix) {
1037 return shorten(s, 20, suffix);
1038 }
1039
1040 public static String[] split(String s) {
1041 return split(s, StringPool.COMMA);
1042 }
1043
1044 public static boolean[] split(String s, boolean x) {
1045 return split(s, StringPool.COMMA, x);
1046 }
1047
1048 public static double[] split(String s, double x) {
1049 return split(s, StringPool.COMMA, x);
1050 }
1051
1052 public static float[] split(String s, float x) {
1053 return split(s, StringPool.COMMA, x);
1054 }
1055
1056 public static int[] split(String s, int x) {
1057 return split(s, StringPool.COMMA, x);
1058 }
1059
1060 public static long[] split(String s, long x) {
1061 return split(s, StringPool.COMMA, x);
1062 }
1063
1064 public static short[] split(String s, short x) {
1065 return split(s, StringPool.COMMA, x);
1066 }
1067
1068 public static String[] split(String s, String delimiter) {
1069 if ((Validator.isNull(s)) || (delimiter == null) ||
1070 (delimiter.equals(StringPool.BLANK))) {
1071
1072 return new String[0];
1073 }
1074
1075 s = s.trim();
1076
1077 if (s.equals(delimiter)) {
1078 return new String[0];
1079 }
1080
1081 List<String> nodeValues = new ArrayList<String>();
1082
1083 if (delimiter.equals(StringPool.NEW_LINE) ||
1084 delimiter.equals(StringPool.RETURN)) {
1085
1086 try {
1087 UnsyncBufferedReader unsyncBufferedReader =
1088 new UnsyncBufferedReader(new UnsyncStringReader(s));
1089
1090 String line = null;
1091
1092 while ((line = unsyncBufferedReader.readLine()) != null) {
1093 nodeValues.add(line);
1094 }
1095
1096 unsyncBufferedReader.close();
1097 }
1098 catch (IOException ioe) {
1099 _log.error(ioe.getMessage());
1100 }
1101 }
1102 else {
1103 int offset = 0;
1104 int pos = s.indexOf(delimiter, offset);
1105
1106 while (pos != -1) {
1107 nodeValues.add(s.substring(offset, pos));
1108
1109 offset = pos + delimiter.length();
1110 pos = s.indexOf(delimiter, offset);
1111 }
1112
1113 if (offset < s.length()) {
1114 nodeValues.add(s.substring(offset));
1115 }
1116 }
1117
1118 return nodeValues.toArray(new String[nodeValues.size()]);
1119 }
1120
1121 public static boolean[] split(String s, String delimiter, boolean x) {
1122 String[] array = split(s, delimiter);
1123 boolean[] newArray = new boolean[array.length];
1124
1125 for (int i = 0; i < array.length; i++) {
1126 boolean value = x;
1127
1128 try {
1129 value = Boolean.valueOf(array[i]).booleanValue();
1130 }
1131 catch (Exception e) {
1132 }
1133
1134 newArray[i] = value;
1135 }
1136
1137 return newArray;
1138 }
1139
1140 public static double[] split(String s, String delimiter, double x) {
1141 String[] array = split(s, delimiter);
1142 double[] newArray = new double[array.length];
1143
1144 for (int i = 0; i < array.length; i++) {
1145 double value = x;
1146
1147 try {
1148 value = Double.parseDouble(array[i]);
1149 }
1150 catch (Exception e) {
1151 }
1152
1153 newArray[i] = value;
1154 }
1155
1156 return newArray;
1157 }
1158
1159 public static float[] split(String s, String delimiter, float x) {
1160 String[] array = split(s, delimiter);
1161 float[] newArray = new float[array.length];
1162
1163 for (int i = 0; i < array.length; i++) {
1164 float value = x;
1165
1166 try {
1167 value = Float.parseFloat(array[i]);
1168 }
1169 catch (Exception e) {
1170 }
1171
1172 newArray[i] = value;
1173 }
1174
1175 return newArray;
1176 }
1177
1178 public static int[] split(String s, String delimiter, int x) {
1179 String[] array = split(s, delimiter);
1180 int[] newArray = new int[array.length];
1181
1182 for (int i = 0; i < array.length; i++) {
1183 int value = x;
1184
1185 try {
1186 value = Integer.parseInt(array[i]);
1187 }
1188 catch (Exception e) {
1189 }
1190
1191 newArray[i] = value;
1192 }
1193
1194 return newArray;
1195 }
1196
1197 public static long[] split(String s, String delimiter, long x) {
1198 String[] array = split(s, delimiter);
1199 long[] newArray = new long[array.length];
1200
1201 for (int i = 0; i < array.length; i++) {
1202 long value = x;
1203
1204 try {
1205 value = Long.parseLong(array[i]);
1206 }
1207 catch (Exception e) {
1208 }
1209
1210 newArray[i] = value;
1211 }
1212
1213 return newArray;
1214 }
1215
1216 public static short[] split(String s, String delimiter, short x) {
1217 String[] array = split(s, delimiter);
1218 short[] newArray = new short[array.length];
1219
1220 for (int i = 0; i < array.length; i++) {
1221 short value = x;
1222
1223 try {
1224 value = Short.parseShort(array[i]);
1225 }
1226 catch (Exception e) {
1227 }
1228
1229 newArray[i] = value;
1230 }
1231
1232 return newArray;
1233 }
1234
1235 public static boolean startsWith(String s, char begin) {
1236 return startsWith(s, (new Character(begin)).toString());
1237 }
1238
1239 public static boolean startsWith(String s, String start) {
1240 if ((s == null) || (start == null)) {
1241 return false;
1242 }
1243
1244 if (start.length() > s.length()) {
1245 return false;
1246 }
1247
1248 String temp = s.substring(0, start.length());
1249
1250 if (temp.equalsIgnoreCase(start)) {
1251 return true;
1252 }
1253 else {
1254 return false;
1255 }
1256 }
1257
1258 /**
1259 * Return the number of starting letters that s1 and s2 have in common
1260 * before they deviate.
1261 *
1262 * @return the number of starting letters that s1 and s2 have in common
1263 * before they deviate
1264 */
1265 public static int startsWithWeight(String s1, String s2) {
1266 if ((s1 == null) || (s2 == null)) {
1267 return 0;
1268 }
1269
1270 char[] charArray1 = s1.toCharArray();
1271 char[] charArray2 = s2.toCharArray();
1272
1273 int i = 0;
1274
1275 for (; (i < charArray1.length) && (i < charArray2.length); i++) {
1276 if (charArray1[i] != charArray2[i]) {
1277 break;
1278 }
1279 }
1280
1281 return i;
1282 }
1283
1284 public static String stripBetween(String s, String begin, String end) {
1285 if ((s == null) || (begin == null) || (end == null)) {
1286 return s;
1287 }
1288
1289 StringBuilder sb = new StringBuilder(s.length());
1290
1291 int pos = 0;
1292
1293 while (true) {
1294 int x = s.indexOf(begin, pos);
1295 int y = s.indexOf(end, x + begin.length());
1296
1297 if ((x == -1) || (y == -1)) {
1298 sb.append(s.substring(pos, s.length()));
1299
1300 break;
1301 }
1302 else {
1303 sb.append(s.substring(pos, x));
1304
1305 pos = y + end.length();
1306 }
1307 }
1308
1309 return sb.toString();
1310 }
1311
1312 public static String trim(String s) {
1313 return trim(s, null);
1314 }
1315
1316 public static String trim(String s, char c) {
1317 return trim(s, new char[] {c});
1318 }
1319
1320 public static String trim(String s, char[] exceptions) {
1321 if (s == null) {
1322 return null;
1323 }
1324
1325 char[] charArray = s.toCharArray();
1326
1327 int len = charArray.length;
1328
1329 int x = 0;
1330 int y = charArray.length;
1331
1332 for (int i = 0; i < len; i++) {
1333 char c = charArray[i];
1334
1335 if (_isTrimable(c, exceptions)) {
1336 x = i + 1;
1337 }
1338 else {
1339 break;
1340 }
1341 }
1342
1343 for (int i = len - 1; i >= 0; i--) {
1344 char c = charArray[i];
1345
1346 if (_isTrimable(c, exceptions)) {
1347 y = i;
1348 }
1349 else {
1350 break;
1351 }
1352 }
1353
1354 if ((x != 0) || (y != len)) {
1355 return s.substring(x, y);
1356 }
1357 else {
1358 return s;
1359 }
1360 }
1361
1362 public static String trimLeading(String s) {
1363 return trimLeading(s, null);
1364 }
1365
1366 public static String trimLeading(String s, char c) {
1367 return trimLeading(s, new char[] {c});
1368 }
1369
1370 public static String trimLeading(String s, char[] exceptions) {
1371 if (s == null) {
1372 return null;
1373 }
1374
1375 char[] charArray = s.toCharArray();
1376
1377 int len = charArray.length;
1378
1379 int x = 0;
1380 int y = charArray.length;
1381
1382 for (int i = 0; i < len; i++) {
1383 char c = charArray[i];
1384
1385 if (_isTrimable(c, exceptions)) {
1386 x = i + 1;
1387 }
1388 else {
1389 break;
1390 }
1391 }
1392
1393 if ((x != 0) || (y != len)) {
1394 return s.substring(x, y);
1395 }
1396 else {
1397 return s;
1398 }
1399 }
1400
1401 public static String trimTrailing(String s) {
1402 return trimTrailing(s, null);
1403 }
1404
1405 public static String trimTrailing(String s, char c) {
1406 return trimTrailing(s, new char[] {c});
1407 }
1408
1409 public static String trimTrailing(String s, char[] exceptions) {
1410 if (s == null) {
1411 return null;
1412 }
1413
1414 char[] charArray = s.toCharArray();
1415
1416 int len = charArray.length;
1417
1418 int x = 0;
1419 int y = charArray.length;
1420
1421 for (int i = len - 1; i >= 0; i--) {
1422 char c = charArray[i];
1423
1424 if (_isTrimable(c, exceptions)) {
1425 y = i;
1426 }
1427 else {
1428 break;
1429 }
1430 }
1431
1432 if ((x != 0) || (y != len)) {
1433 return s.substring(x, y);
1434 }
1435 else {
1436 return s;
1437 }
1438 }
1439
1440 public static String unquote(String s) {
1441 if (s == null) {
1442 return s;
1443 }
1444
1445 if (s.startsWith(StringPool.QUOTE) && s.endsWith(StringPool.QUOTE)) {
1446 s = s.replaceAll("\"$", StringPool.BLANK);
1447 s = s.replaceAll("^\"", StringPool.BLANK);
1448 }
1449
1450 return s;
1451 }
1452
1453 public static String upperCase(String s) {
1454 if (s == null) {
1455 return null;
1456 }
1457 else {
1458 return s.toUpperCase();
1459 }
1460 }
1461
1462 public static String upperCaseFirstLetter(String s) {
1463 char[] charArray = s.toCharArray();
1464
1465 if ((charArray[0] >= 97) && (charArray[0] <= 122)) {
1466 charArray[0] = (char)(charArray[0] - 32);
1467 }
1468
1469 return new String(charArray);
1470 }
1471
1472 public static String valueOf(Object obj) {
1473 return String.valueOf(obj);
1474 }
1475
1476 public static String wrap(String text) {
1477 return wrap(text, 80, StringPool.NEW_LINE);
1478 }
1479
1480 public static String wrap(String text, int width, String lineSeparator) {
1481 try {
1482 return _wrap(text, width, lineSeparator);
1483 }
1484 catch (IOException ioe) {
1485 _log.error(ioe.getMessage());
1486
1487 return text;
1488 }
1489 }
1490
1491 private static String _highlight(
1492 String s, Pattern pattern, String highlight1, String highlight2) {
1493
1494 StringTokenizer st = new StringTokenizer(s);
1495
1496 StringBundler sb = null;
1497
1498 if (st.countTokens() == 0) {
1499 sb = new StringBundler();
1500 }
1501 else {
1502 sb = new StringBundler(2 * st.countTokens() - 1);
1503 }
1504
1505 while (st.hasMoreTokens()) {
1506 String token = st.nextToken();
1507
1508 Matcher matcher = pattern.matcher(token);
1509
1510 if (matcher.find()) {
1511 String highlightedToken = matcher.replaceAll(
1512 highlight1 + matcher.group() + highlight2);
1513
1514 sb.append(highlightedToken);
1515 }
1516 else {
1517 sb.append(token);
1518 }
1519
1520 if (st.hasMoreTokens()) {
1521 sb.append(StringPool.SPACE);
1522 }
1523 }
1524
1525 return sb.toString();
1526 }
1527
1528 private static boolean _isTrimable(char c, char[] exceptions) {
1529 if ((exceptions != null) && (exceptions.length > 0)) {
1530 for (int i = 0; i < exceptions.length; i++) {
1531 if (c == exceptions[i]) {
1532 return false;
1533 }
1534 }
1535 }
1536
1537 return Character.isWhitespace(c);
1538 }
1539
1540 private static String _wrap(String text, int width, String lineSeparator)
1541 throws IOException {
1542
1543 if (text == null) {
1544 return null;
1545 }
1546
1547 StringBundler sb = new StringBundler();
1548
1549 UnsyncBufferedReader unsyncBufferedReader = new UnsyncBufferedReader(
1550 new UnsyncStringReader(text));
1551
1552 String s = StringPool.BLANK;
1553
1554 while ((s = unsyncBufferedReader.readLine()) != null) {
1555 if (s.length() == 0) {
1556 sb.append(lineSeparator);
1557
1558 continue;
1559 }
1560
1561 int lineLength = 0;
1562
1563 String[] tokens = s.split(StringPool.SPACE);
1564
1565 for (String token : tokens) {
1566 if ((lineLength + token.length() + 1) > width) {
1567 if (lineLength > 0) {
1568 sb.append(lineSeparator);
1569 }
1570
1571 if (token.length() > width) {
1572 int pos = token.indexOf(StringPool.OPEN_PARENTHESIS);
1573
1574 if (pos != -1) {
1575 sb.append(token.substring(0, pos + 1));
1576 sb.append(lineSeparator);
1577
1578 token = token.substring(pos + 1);
1579
1580 sb.append(token);
1581
1582 lineLength = token.length();
1583 }
1584 else {
1585 sb.append(token);
1586
1587 lineLength = token.length();
1588 }
1589 }
1590 else {
1591 sb.append(token);
1592
1593 lineLength = token.length();
1594 }
1595 }
1596 else {
1597 if (lineLength > 0) {
1598 sb.append(StringPool.SPACE);
1599
1600 lineLength++;
1601 }
1602
1603 sb.append(token);
1604
1605 lineLength += token.length();
1606 }
1607 }
1608
1609 sb.append(lineSeparator);
1610 }
1611
1612 return sb.toString();
1613 }
1614
1615 private static Log _log = LogFactoryUtil.getLog(StringUtil.class);
1616
1617 }

　　

package liferay;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import liferay.dao.*;

public class StringUtil {

public String merge(Collection<?> col ,String delimiter) {

return merge(col.toArray(new Object[col.size()]),delimiter);

}

public String merge(Object[] obj,String delimiter) {

StringBuilder sb =null;
if (obj == null) {
return null;
}

if (obj.length == 0) {
sb = new StringBuilder();
} else {
sb = new StringBuilder(2*obj.length-1);
}

for (int i = 0;i<obj.length;i++) {
sb.append(String.valueOf(obj[i]).trim());
if ((i+1) != obj.length) {
sb.append(delimiter);
}
}

return sb.toString();

}

//把数组中的元素转化成字符串
public String merge(float [] array,String delimiter) {
//如果数组是个空的就
if (array == null) {
return null;
}

StringBuffer sb = null;

if (array.length == 0) {
sb = new StringBuffer();
} else {
sb = new StringBuffer(2*array.length-1);
}

for (int i=0;i<array.length;i++) {
sb.append(String.valueOf(array[i]).trim());
if ((i+1) != array.length) {
sb.append(delimiter);
}

}

return sb.toString();

}

public static void main(String[] args) {
StringUtil stutil = new StringUtil();
float [] a = new float[]{(float)1.2,(float)1.3,(float)1.4,(float) 1.5};
String str = stutil.merge(a, "-");
System.out.println(str+"@@@@@@@@@");

List<Student> lists = new ArrayList<Student>();

for (int i = 0;i<3;i++) {
final Student student = new Student();
student.setAge((i*10+1));
student.setName("张"+i);
student.setSex("男");

lists.add(student);

}

String s = stutil.merge(lists, "-");

System.out.println(s);

}

}