本文实例讲述了Java实现的文本字符串操作工具类。分享给大家供大家参考，具体如下：
|
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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
|
package com.gcloud.common;import org.apache.commons.lang.StringUtils;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.text.BreakIterator;import java.util.ArrayList;import java.util.Date;import java.util.Random;/** * 文本字符串工具类 * Created by charlin on 2017/9/10. */public class TextUtil { private static final char[] QUOTE_ENCODE = """.toCharArray(); private static final char[] AMP_ENCODE = "&".toCharArray(); private static final char[] LT_ENCODE = "<".toCharArray(); private static final char[] GT_ENCODE = ">".toCharArray(); private final static String[] hex = { "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0A", "0B", "0C", "0D", "0E", "0F", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1A", "1B", "1C", "1D", "1E", "1F", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2A", "2B", "2C", "2D", "2E", "2F", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3A", "3B", "3C", "3D", "3E", "3F", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4A", "4B", "4C", "4D", "4E", "4F", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5A", "5B", "5C", "5D", "5E", "5F", "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6A", "6B", "6C", "6D", "6E", "6F", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7A", "7B", "7C", "7D", "7E", "7F", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8A", "8B", "8C", "8D", "8E", "8F", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9A", "9B", "9C", "9D", "9E", "9F", "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "AA", "AB", "AC", "AD", "AE", "AF", "B0", "B1", "B2", "B3", "B4", "B5", "B6", "B7", "B8", "B9", "BA", "BB", "BC", "BD", "BE", "BF", "C0", "C1", "C2", "C3", "C4", "C5", "C6", "C7", "C8", "C9", "CA", "CB", "CC", "CD", "CE", "CF", "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7", "D8", "D9", "DA", "DB", "DC", "DD", "DE", "DF", "E0", "E1", "E2", "E3", "E4", "E5", "E6", "E7", "E8", "E9", "EA", "EB", "EC", "ED", "EE", "EF", "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "FA", "FB", "FC", "FD", "FE", "FF" }; private final static byte[] val = { 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F }; private static MessageDigest digest = null; /** * 替换字符串 * @param line * @param oldStr * @param newStr * @return */ public static String replace(String line , String oldStr, String newStr){ if (StringUtils.isEmpty(line)) return null; int index = 0; if ((index = line.indexOf(oldStr, index)) >= 0){ char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; while((index = line.indexOf(oldStr, index)) > 0){ buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; } buf.append(charArray, i, charArray.length - i); return buf.toString(); } return line; } /** * 替换字符串,并存入替换次数 * @param line * @param oldStr * @param newStr * @return */ public static String replace(String line , String oldStr, String newStr, int[] countArr){ if (StringUtils.isEmpty(line)) return null; int index = 0; if ((index = line.indexOf(oldStr, index)) >= 0){ int count = 0; count++; char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; while((index = line.indexOf(oldStr, index)) > 0){ buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; count++; } buf.append(charArray, i, charArray.length - i); countArr[0] = count; return buf.toString(); } return line; } /** * 替换字符串，不区分大小写 * @param line * @param oldStr * @param newStr * @return */ public static String replaceIgnoreCase(String line , String oldStr, String newStr){ if (StringUtils.isEmpty(line)) return null; int index = 0; line = line.toLowerCase(); oldStr = oldStr.toLowerCase(); if ((index = line.indexOf(oldStr, index)) >= 0){ char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; while((index = line.indexOf(oldStr, index)) > 0){ buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; } buf.append(charArray, i, charArray.length - i); return buf.toString(); } return line; } /** * 替换字符串，不区分大小写, 并存入替换次数 * @param line * @param oldStr * @param newStr * @return */ public static String replaceIgnoreCase(String line , String oldStr, String newStr, int[] countArr){ if (StringUtils.isEmpty(line)) return null; int index = 0; line = line.toLowerCase(); oldStr = oldStr.toLowerCase(); if ((index = line.indexOf(oldStr, index)) >= 0){ char[] charArray = line.toCharArray(); char[] newStrArray = newStr.toCharArray(); int oldLen = oldStr.length(); StringBuffer buf = new StringBuffer(charArray.length); buf.append(charArray, 0, index).append(newStrArray); index += oldLen; int i = index; int count = 0; while((index = line.indexOf(oldStr, index)) > 0){ count ++; buf.append(charArray, i, index - i).append(newStrArray); index += oldLen; i = index; } buf.append(charArray, i, charArray.length - i); countArr[0] = count; return buf.toString(); } return line; } /** * 替换页面html标签 * @param htmlStr * @return */ public static String escapeHTMLTags(String htmlStr) { if (StringUtils.isEmpty(htmlStr)) return null; char ch; int last = 0; char[] htmlStrArr = htmlStr.toCharArray(); int len = htmlStrArr.length; StringBuffer outBuf = new StringBuffer((int) (len * 1.3)); int i = 0; for (; i < len; i++) { ch = htmlStrArr[i]; if (ch > '>') { continue; } else if (ch == '<') { if (i > last) { outBuf.append(htmlStrArr, last, i - last); } last = i + 1; outBuf.append(LT_ENCODE); } else if (ch == '>') { if (i > last) { outBuf.append(htmlStrArr, last, i - last); } last = i + 1; outBuf.append(GT_ENCODE); } } if (last == 0) { return htmlStr; } if (i > last) { outBuf.append(htmlStrArr, last, i - last); } return outBuf.toString(); } /** * Hashes a String using the Md5 algorithm and returns the result as a * String of hexadecimal numbers. This method is synchronized to avoid * excessive MessageDigest object creation. If calling this method becomes a * bottleneck in your code, you may wish to maintain a pool of MessageDigest * objects instead of using this method. * @param data * @return */ public synchronized static String hash(String data) { if (digest == null) { try { digest = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { System.err.println("Failed to load the MD5 MessageDigest.Jive will be unable to function normally."); e.printStackTrace(); } } digest.update(data.getBytes()); return encodeHex(digest.digest()); } /** * Turns an array of bytes into a String representing each byte as an * unsigned hex number. * @param bytes * @return */ public static final String encodeHex(byte[] bytes) { StringBuffer buf = new StringBuffer(bytes.length * 2); int i; for (i = 0; i < bytes.length; i++) { if (((int) bytes[i] & 0xff) < 0x10) { buf.append("0"); } buf.append(Long.toString((int) bytes[i] & 0xff, 16)); } return buf.toString(); } /** * Turns a hex encoded string into a byte array. It is specifically meant to * "reverse" the toHex(byte[]) method. * @param hex * @return */ public static byte[] decodeHex(String hex) { char[] chars = hex.toCharArray(); byte[] bytes = new byte[chars.length / 2]; int byteCount = 0; for (int i = 0; i < chars.length; i += 2) { byte newByte = 0x00; newByte |= hexCharToByte(chars[i]); newByte <<= 4; newByte |= hexCharToByte(chars[i + 1]); bytes[byteCount] = newByte; byteCount++; } return bytes; } /** * Returns the the byte value of a hexadecmical char (0-f). It's assumed * that the hexidecimal chars are lower case as appropriate. * @param ch a hexedicmal character (0-f) * @return the byte value of the character (0x00-0x0F) */ private static final byte hexCharToByte(char ch) { switch (ch) { case '0': return 0x00; case '1': return 0x01; case '2': return 0x02; case '3': return 0x03; case '4': return 0x04; case '5': return 0x05; case '6': return 0x06; case '7': return 0x07; case '8': return 0x08; case '9': return 0x09; case 'a': return 0x0A; case 'b': return 0x0B; case 'c': return 0x0C; case 'd': return 0x0D; case 'e': return 0x0E; case 'f': return 0x0F; } return 0x00; } // ********************************************************************* // * Base64 - a simple base64 encoder and decoder. // ********************************************************************* /** * Encodes a String as a base64 String. * @param data a String to encode. * @return a base64 encoded String. */ public static String encodeBase64(String data) { return encodeBase64(data.getBytes()); } /** * Encodes a byte array into a base64 String. * @param data a byte array to encode. * @return a base64 encode String. */ public static String encodeBase64(byte[] data) { int c; int len = data.length; StringBuffer ret = new StringBuffer(((len / 3) + 1) * 4); for (int i = 0; i < len; ++i) { c = (data[i] >> 2) & 0x3f; ret.append(cvt.charAt(c)); c = (data[i] << 4) & 0x3f; if (++i < len) c |= (data[i] >> 4) & 0x0f; ret.append(cvt.charAt(c)); if (i < len) { c = (data[i] << 2) & 0x3f; if (++i < len) c |= (data[i] >> 6) & 0x03; ret.append(cvt.charAt(c)); } else { ++i; ret.append((char) fillchar); } if (i < len) { c = data[i] & 0x3f; ret.append(cvt.charAt(c)); } else { ret.append((char) fillchar); } } return ret.toString(); } /** * Decodes a base64 String. * @param data a base64 encoded String to decode. * @return the decoded String. */ public static String decodeBase64(String data) { return decodeBase64(data.getBytes()); } /** * Decodes a base64 aray of bytes. * @param data a base64 encode byte array to decode. * @return the decoded String. */ public static String decodeBase64(byte[] data) { int c, c1; int len = data.length; StringBuffer ret = new StringBuffer((len * 3) / 4); for (int i = 0; i < len; ++i) { c = cvt.indexOf(data[i]); ++i; c1 = cvt.indexOf(data[i]); c = ((c << 2) | ((c1 >> 4) & 0x3)); ret.append((char) c); if (++i < len) { c = data[i]; if (fillchar == c) break; c = cvt.indexOf((char) c); c1 = ((c1 << 4) & 0xf0) | ((c >> 2) & 0xf); ret.append((char) c1); } if (++i < len) { c1 = data[i]; if (fillchar == c1) break; c1 = cvt.indexOf((char) c1); c = ((c << 6) & 0xc0) | c1; ret.append((char) c); } } return ret.toString(); } private static final int fillchar = '='; private static final String cvt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "0123456789+/"; /** * Converts a line of text into an array of lower case words using a * BreakIterator.wordInstance(). * This method is under the Jive Open Source Software License and was * written by Mark Imbriaco. * @param text a String of text to convert into an array of words * @return text broken up into an array of words. */ public static final String[] toLowerCaseWordArray(String text) { if (text == null || text.length() == 0) { return new String[0]; } ArrayList wordList = new ArrayList(); BreakIterator boundary = BreakIterator.getWordInstance(); boundary.setText(text); int start = 0; for (int end = boundary.next(); end != BreakIterator.DONE; start = end, end = boundary.next()) { String tmp = text.substring(start, end).trim(); tmp = replace(tmp, "+", ""); tmp = replace(tmp, "/", ""); tmp = replace(tmp, "\\", ""); tmp = replace(tmp, "#", ""); tmp = replace(tmp, "*", ""); tmp = replace(tmp, ")", ""); tmp = replace(tmp, "(", ""); tmp = replace(tmp, "&", ""); if (tmp.length() > 0) { wordList.add(tmp); } } return (String[]) wordList.toArray(new String[wordList.size()]); } /** * Pseudo-random number generator object for use with randomString(). The * Random class is not considered to be cryptographically secure, so only * use these random Strings for low to medium security applications. */ private static Random randGen = new Random(); /** * Array of numbers and letters of mixed case. Numbers appear in the list * twice so that there is a more equal chance that a number will be picked. * We can use the array to get a random number or letter by picking a random * array index. */ private static char[] numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" + "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray(); /** * Returns a random String of numbers and letters (lower and upper case) of * the specified length. The method uses the Random class that is built-in * to Java which is suitable for low to medium grade security uses. This * means that the output is only pseudo random, i.e., each number is * mathematically generated so is not truly random. * @param length the desired length of the random String to return. * @return a random String of numbers and letters of the specified length. */ public static final String randomString(int length) { if (length < 1) { return null; } char[] randBuffer = new char[length]; for (int i = 0; i < randBuffer.length; i++) { randBuffer[i] = numbersAndLetters[randGen.nextInt(71)]; } return new String(randBuffer); } /** * Intelligently chops a String at a word boundary (whitespace) that occurs * at the specified index in the argument or before. However, if there is a * newline character before <code>length</code>, the String will be * chopped there. If no newline or whitespace is found in * <code>string</code> up to the index <code>length</code>, the String * will chopped at <code>length</code>. * <p> * For example, chopAtWord("This is a nice String", 10) will return "This is * a" which is the first word boundary less than or equal to 10 characters * into the original String. * @param string the String to chop. * @param length * @return a substring of <code>string</code> whose length is less than or * equal to <code>length</code>, and that is chopped at * whitespace. */ public static final String chopAtWord(String string, int length) { if (string == null) { return string; } char[] charArray = string.toCharArray(); int sLength = string.length(); if (length < sLength) { sLength = length; } // First check if there is a newline character before length; if so, // chop word there. for (int i = 0; i < sLength - 1; i++) { // Windows if (charArray[i] == '\r' && charArray[i + 1] == '\n') { return string.substring(0, i + 1); } // Unix else if (charArray[i] == '\n') { return string.substring(0, i); } } // Also check boundary case of Unix newline if (charArray[sLength - 1] == '\n') { return string.substring(0, sLength - 1); } // Done checking for newline, now see if the total string is less than // the specified chop point. if (string.length() < length) { return string; } // No newline, so chop at the first whitespace. for (int i = length - 1; i > 0; i--) { if (charArray[i] == ' ') { return string.substring(0, i).trim(); } } // Did not find word boundary so return original String chopped at // specified length. return string.substring(0, length); } /** * Escapes all necessary characters in the String so that it can be used in * an XML doc. * @param string the string to escape. * @return the string with appropriate characters escaped. */ public static final String escapeForXML(String string) { if (string == null) { return null; } char ch; int i = 0; int last = 0; char[] input = string.toCharArray(); int len = input.length; StringBuffer out = new StringBuffer((int) (len * 1.3)); for (; i < len; i++) { ch = input[i]; if (ch > '>') { continue; } else if (ch == '<') { if (i > last) { out.append(input, last, i - last); } last = i + 1; out.append(LT_ENCODE); } else if (ch == '&') { if (i > last) { out.append(input, last, i - last); } last = i + 1; out.append(AMP_ENCODE); } else if (ch == '"') { if (i > last) { out.append(input, last, i - last); } last = i + 1; out.append(QUOTE_ENCODE); } } if (last == 0) { return string; } if (i > last) { out.append(input, last, i - last); } return out.toString(); } /** * Unescapes the String by converting XML escape sequences back into normal * characters. * @param string the string to unescape. * @return the string with appropriate characters unescaped. */ public static final String unescapeFromXML(String string) { string = replace(string, "<", "<"); string = replace(string, ">", ">"); string = replace(string, """, "\""); return replace(string, "&", "&"); } public static String escape(String s) { StringBuffer sbuf = new StringBuffer(); int len = s.length(); for (int i = 0; i < len; i++) { int ch = s.charAt(i); if (ch == ' ') { // space : map to '+' sbuf.append('+'); } else if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was sbuf.append((char) ch); } else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was sbuf.append((char) ch); } else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was sbuf.append((char) ch); } else if (ch == '-' || ch == '_' // unreserved : as it was || ch == '.' || ch == '!' || ch == '~' || ch == '*' || ch == '\'' || ch == '(' || ch == ')') { sbuf.append((char) ch); } else if (ch <= 0x007F) { // other ASCII : map to %XX sbuf.append('%'); sbuf.append(hex[ch]); } else { // unicode : map to %uXXXX sbuf.append('%'); sbuf.append('u'); sbuf.append(hex[(ch >>> 8)]); sbuf.append(hex[(0x00FF & ch)]); } } return sbuf.toString(); } public static String unescape(String s) { StringBuffer sbuf = new StringBuffer(); int i = 0; int len = s.length(); while (i < len) { int ch = s.charAt(i); if (ch == '+') { // + : map to ' ' sbuf.append(' '); } else if ('A' <= ch && ch <= 'Z') { // 'A'..'Z' : as it was sbuf.append((char) ch); } else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it was sbuf.append((char) ch); } else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it was sbuf.append((char) ch); } else if (ch == '-' || ch == '_' // unreserved : as it was || ch == '.' || ch == '!' || ch == '~' || ch == '*' || ch == '\'' || ch == '(' || ch == ')') { sbuf.append((char) ch); } else if (ch == '%') { int cint = 0; if ('u' != s.charAt(i + 1)) { // %XX : map to ascii(XX) cint = (cint << 4) | val[s.charAt(i + 1)]; cint = (cint << 4) | val[s.charAt(i + 2)]; i += 2; } else { // %uXXXX : map to unicode(XXXX) cint = (cint << 4) | val[s.charAt(i + 2)]; cint = (cint << 4) | val[s.charAt(i + 3)]; cint = (cint << 4) | val[s.charAt(i + 4)]; cint = (cint << 4) | val[s.charAt(i + 5)]; i += 5; } sbuf.append((char) cint); } i++; } return sbuf.toString(); } private static final char[] zeroArray = "0000000000000000".toCharArray(); /** * Pads the supplied String with 0's to the specified length and returns the * result as a new String. For example, if the initial String is "9999" and * the desired length is 8, the result would be "00009999". This type of * padding is useful for creating numerical values that need to be stored * and sorted as character data. Note: the current implementation of this * method allows for a maximum <tt>length</tt> of 16. * * @param string * the original String to pad. * @param length * the desired length of the new padded String. * @return a new String padded with the required number of 0's. */ public static final String zeroPadString(String string, int length) { if (string == null || string.length() > length) { return string; } StringBuffer buf = new StringBuffer(length); buf.append(zeroArray, 0, length - string.length()).append(string); return buf.toString(); } /** * Formats a Date as a fifteen character long String made up of the Date's * padded millisecond value. * @return a Date encoded as a String. */ public static final String dateToMillis(Date date) { return zeroPadString(Long.toString(date.getTime()), 15); } public static void main(String[] args) { System.out.println(replace("aaaaabbbcccc", "aa", "gg")); System.out.println(replaceIgnoreCase("AAAAbbbcccc", "aa", "gg")); System.out.println(escapeHTMLTags("AAAAbb<bcccc>")); }} |
希望本文所述对大家java程序设计有所帮助。
原文链接：http://blog.csdn.net/lovoo/article/details/77920901
