liferay笑傲江湖-API之参数的工具类（ParamUtil）
public class ParamUtil {
036
037 public static boolean get(
038 HttpServletRequest request, String param, boolean defaultValue) {
039
040 return GetterUtil.get(request.getParameter(param), defaultValue);
041 }
042
043 public static Date get(
044 HttpServletRequest request, String param, DateFormat dateFormat,
045 Date defaultValue) {
046
047 return GetterUtil.get(
048 request.getParameter(param), dateFormat, defaultValue);
049 }
050
051 public static double get(
052 HttpServletRequest request, String param, double defaultValue) {
053
054 return GetterUtil.get(request.getParameter(param), defaultValue);
055 }
056
057 public static float get(
058 HttpServletRequest request, String param, float defaultValue) {
059
060 return GetterUtil.get(request.getParameter(param), defaultValue);
061 }
062
063 public static int get(
064 HttpServletRequest request, String param, int defaultValue) {
065
066 return GetterUtil.get(request.getParameter(param), defaultValue);
067 }
068
069 public static long get(
070 HttpServletRequest request, String param, long defaultValue) {
071
072 return GetterUtil.get(request.getParameter(param), defaultValue);
073 }
074
075 public static short get(
076 HttpServletRequest request, String param, short defaultValue) {
077
078 return GetterUtil.get(request.getParameter(param), defaultValue);
079 }
080
081 public static String get(
082 HttpServletRequest request, String param, String defaultValue) {
083
084 String returnValue =
085 GetterUtil.get(request.getParameter(param), defaultValue);
086
087 if (returnValue != null) {
088 return returnValue.trim();
089 }
090
091 return null;
092 }
093
094 public static boolean get(
095 PortletRequest portletRequest, String param, boolean defaultValue) {
096
097 return GetterUtil.get(portletRequest.getParameter(param), defaultValue);
098 }
099
100 public static Date get(
101 PortletRequest portletRequest, String param, DateFormat dateFormat,
102 Date defaultValue) {
103
104 return GetterUtil.get(
105 portletRequest.getParameter(param), dateFormat, defaultValue);
106 }
107
108 public static double get(
109 PortletRequest portletRequest, String param, double defaultValue) {
110
111 return GetterUtil.get(portletRequest.getParameter(param), defaultValue);
112 }
113
114 public static float get(
115 PortletRequest portletRequest, String param, float defaultValue) {
116
117 return GetterUtil.get(portletRequest.getParameter(param), defaultValue);
118 }
119
120 public static int get(
121 PortletRequest portletRequest, String param, int defaultValue) {
122
123 return GetterUtil.get(portletRequest.getParameter(param), defaultValue);
124 }
125
126 public static long get(
127 PortletRequest portletRequest, String param, long defaultValue) {
128
129 return GetterUtil.get(portletRequest.getParameter(param), defaultValue);
130 }
131
132 public static short get(
133 PortletRequest portletRequest, String param, short defaultValue) {
134
135 return GetterUtil.get(portletRequest.getParameter(param), defaultValue);
136 }
137
138 public static String get(
139 PortletRequest portletRequest, String param, String defaultValue) {
140
141 String returnValue =
142 GetterUtil.get(portletRequest.getParameter(param), defaultValue);
143
144 if (returnValue != null) {
145 return returnValue.trim();
146 }
147
148 return null;
149 }
150
151 public static boolean get(
152 ServiceContext serviceContext, String param, boolean defaultValue) {
153
154 return GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
155 }
156
157 public static Date get(
158 ServiceContext serviceContext, String param, DateFormat dateFormat,
159 Date defaultValue) {
160
161 return GetterUtil.get(
162 serviceContext.getAttribute(param), dateFormat, defaultValue);
163 }
164
165 public static double get(
166 ServiceContext serviceContext, String param, double defaultValue) {
167
168 return GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
169 }
170
171 public static float get(
172 ServiceContext serviceContext, String param, float defaultValue) {
173
174 return GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
175 }
176
177 public static int get(
178 ServiceContext serviceContext, String param, int defaultValue) {
179
180 return GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
181 }
182
183 public static long get(
184 ServiceContext serviceContext, String param, long defaultValue) {
185
186 return GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
187 }
188
189 public static short get(
190 ServiceContext serviceContext, String param, short defaultValue) {
191
192 return GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
193 }
194
195 public static String get(
196 ServiceContext serviceContext, String param, String defaultValue) {
197
198 String returnValue =
199 GetterUtil.get(serviceContext.getAttribute(param), defaultValue);
200
201 if (returnValue != null) {
202 return returnValue.trim();
203 }
204
205 return null;
206 }
207
208 public static boolean getBoolean(HttpServletRequest request, String param) {
209 return GetterUtil.getBoolean(request.getParameter(param));
210 }
211
212 public static boolean getBoolean(
213 HttpServletRequest request, String param, boolean defaultValue) {
214
215 return get(request, param, defaultValue);
216 }
217
218 public static boolean getBoolean(
219 PortletRequest portletRequest, String param) {
220
221 return GetterUtil.getBoolean(portletRequest.getParameter(param));
222 }
223
224 public static boolean getBoolean(
225 PortletRequest portletRequest, String param, boolean defaultValue) {
226
227 return get(portletRequest, param, defaultValue);
228 }
229
230 public static boolean getBoolean(
231 ServiceContext serviceContext, String param) {
232
233 return GetterUtil.getBoolean(serviceContext.getAttribute(param));
234 }
235
236 public static boolean getBoolean(
237 ServiceContext serviceContext, String param, boolean defaultValue) {
238
239 return get(serviceContext, param, defaultValue);
240 }
241
242 public static boolean[] getBooleanValues(
243 HttpServletRequest request, String param) {
244
245 return getBooleanValues(request, param, new boolean[0]);
246 }
247
248 public static boolean[] getBooleanValues(
249 HttpServletRequest request, String param, boolean[] defaultValue) {
250
251 return GetterUtil.getBooleanValues(
252 request.getParameterValues(param), defaultValue);
253 }
254
255 public static boolean[] getBooleanValues(
256 PortletRequest portletRequest, String param) {
257
258 return getBooleanValues(portletRequest, param, new boolean[0]);
259 }
260
261 public static boolean[] getBooleanValues(
262 PortletRequest portletRequest, String param, boolean[] defaultValue) {
263
264 return GetterUtil.getBooleanValues(
265 portletRequest.getParameterValues(param), defaultValue);
266 }
267
268 public static boolean[] getBooleanValues(
269 ServiceContext serviceContext, String param) {
270
271 return getBooleanValues(serviceContext, param, new boolean[0]);
272 }
273
274 public static boolean[] getBooleanValues(
275 ServiceContext serviceContext, String param, boolean[] defaultValue) {
276
277 return GetterUtil.getBooleanValues(
278 serviceContext.getAttribute(param), defaultValue);
279 }
280
281 public static Date getDate(
282 HttpServletRequest request, String param, DateFormat dateFormat) {
283
284 return GetterUtil.getDate(request.getParameter(param), dateFormat);
285 }
286
287 public static Date getDate(
288 HttpServletRequest request, String param, DateFormat dateFormat,
289 Date defaultValue) {
290
291 return get(request, param, dateFormat, defaultValue);
292 }
293
294 public static Date getDate(
295 PortletRequest portletRequest, String param, DateFormat dateFormat) {
296
297 return GetterUtil.getDate(
298 portletRequest.getParameter(param), dateFormat);
299 }
300
301 public static Date getDate(
302 PortletRequest portletRequest, String param, DateFormat dateFormat,
303 Date defaultValue) {
304
305 return get(portletRequest, param, dateFormat, defaultValue);
306 }
307
308 public static Date getDate(
309 ServiceContext serviceContext, String param, DateFormat dateFormat) {
310
311 return GetterUtil.getDate(
312 serviceContext.getAttribute(param), dateFormat);
313 }
314
315 public static Date getDate(
316 ServiceContext serviceContext, String param, DateFormat dateFormat,
317 Date defaultValue) {
318
319 return get(serviceContext, param, dateFormat, defaultValue);
320 }
321
322 public static Date[] getDateValues(
323 HttpServletRequest request, String param, DateFormat dateFormat) {
324
325 return getDateValues(request, param, dateFormat, new Date[0]);
326 }
327
328 public static Date[] getDateValues(
329 HttpServletRequest request, String param, DateFormat dateFormat,
330 Date[] defaultValue) {
331
332 return GetterUtil.getDateValues(
333 request.getParameterValues(param), dateFormat, defaultValue);
334 }
335
336 public static Date[] getDateValues(
337 PortletRequest portletRequest, String param, DateFormat dateFormat) {
338
339 return getDateValues(portletRequest, param, dateFormat, new Date[0]);
340 }
341
342 public static Date[] getDateValues(
343 PortletRequest portletRequest, String param, DateFormat dateFormat,
344 Date[] defaultValue) {
345
346 return GetterUtil.getDateValues(
347 portletRequest.getParameterValues(param), dateFormat, defaultValue);
348 }
349
350 public static Date[] getDateValues(
351 ServiceContext serviceContext, String param, DateFormat dateFormat) {
352
353 return getDateValues(serviceContext, param, dateFormat, new Date[0]);
354 }
355
356 public static Date[] getDateValues(
357 ServiceContext serviceContext, String param, DateFormat dateFormat,
358 Date[] defaultValue) {
359
360 return GetterUtil.getDateValues(
361 serviceContext.getAttribute(param), dateFormat, defaultValue);
362 }
363
364 public static double getDouble(HttpServletRequest request, String param) {
365 return GetterUtil.getDouble(request.getParameter(param));
366 }
367
368 public static double getDouble(
369 HttpServletRequest request, String param, double defaultValue) {
370
371 return get(request, param, defaultValue);
372 }
373
374 public static double getDouble(
375 PortletRequest portletRequest, String param) {
376
377 return GetterUtil.getDouble(portletRequest.getParameter(param));
378 }
379
380 public static double getDouble(
381 PortletRequest portletRequest, String param, double defaultValue) {
382
383 return get(portletRequest, param, defaultValue);
384 }
385
386 public static double getDouble(
387 ServiceContext serviceContext, String param) {
388
389 return GetterUtil.getDouble(serviceContext.getAttribute(param));
390 }
391
392 public static double getDouble(
393 ServiceContext serviceContext, String param, double defaultValue) {
394
395 return get(serviceContext, param, defaultValue);
396 }
397
398 public static double[] getDoubleValues(
399 HttpServletRequest request, String param) {
400
401 return getDoubleValues(request, param, new double[0]);
402 }
403
404 public static double[] getDoubleValues(
405 HttpServletRequest request, String param, double[] defaultValue) {
406
407 return GetterUtil.getDoubleValues(
408 request.getParameterValues(param), defaultValue);
409 }
410
411 public static double[] getDoubleValues(
412 PortletRequest portletRequest, String param) {
413
414 return getDoubleValues(portletRequest, param, new double[0]);
415 }
416
417 public static double[] getDoubleValues(
418 PortletRequest portletRequest, String param, double[] defaultValue) {
419
420 return GetterUtil.getDoubleValues(
421 portletRequest.getParameterValues(param), defaultValue);
422 }
423
424 public static double[] getDoubleValues(
425 ServiceContext serviceContext, String param) {
426
427 return getDoubleValues(serviceContext, param, new double[0]);
428 }
429
430 public static double[] getDoubleValues(
431 ServiceContext serviceContext, String param, double[] defaultValue) {
432
433 return GetterUtil.getDoubleValues(
434 serviceContext.getAttribute(param), defaultValue);
435 }
436
437 public static float getFloat(HttpServletRequest request, String param) {
438 return GetterUtil.getFloat(request.getParameter(param));
439 }
440
441 public static float getFloat(
442 HttpServletRequest request, String param, float defaultValue) {
443
444 return get(request, param, defaultValue);
445 }
446
447 public static float getFloat(PortletRequest portletRequest, String param) {
448 return GetterUtil.getFloat(portletRequest.getParameter(param));
449 }
450
451 public static float getFloat(
452 PortletRequest portletRequest, String param, float defaultValue) {
453
454 return get(portletRequest, param, defaultValue);
455 }
456
457 public static float getFloat(ServiceContext serviceContext, String param) {
458 return GetterUtil.getFloat(serviceContext.getAttribute(param));
459 }
460
461 public static float getFloat(
462 ServiceContext serviceContext, String param, float defaultValue) {
463
464 return get(serviceContext, param, defaultValue);
465 }
466
467 public static float[] getFloatValues(
468 HttpServletRequest request, String param) {
469
470 return getFloatValues(request, param, new float[0]);
471 }
472
473 public static float[] getFloatValues(
474 HttpServletRequest request, String param, float[] defaultValue) {
475
476 return GetterUtil.getFloatValues(
477 request.getParameterValues(param), defaultValue);
478 }
479
480 public static float[] getFloatValues(
481 PortletRequest portletRequest, String param) {
482
483 return getFloatValues(portletRequest, param, new float[0]);
484 }
485
486 public static float[] getFloatValues(
487 PortletRequest portletRequest, String param, float[] defaultValue) {
488
489 return GetterUtil.getFloatValues(
490 portletRequest.getParameterValues(param), defaultValue);
491 }
492
493 public static float[] getFloatValues(
494 ServiceContext serviceContext, String param) {
495
496 return getFloatValues(serviceContext, param, new float[0]);
497 }
498
499 public static float[] getFloatValues(
500 ServiceContext serviceContext, String param, float[] defaultValue) {
501
502 return GetterUtil.getFloatValues(
503 serviceContext.getAttribute(param), defaultValue);
504 }
505
506 public static int getInteger(HttpServletRequest request, String param) {
507 return GetterUtil.getInteger(request.getParameter(param));
508 }
509
510 public static int getInteger(
511 HttpServletRequest request, String param, int defaultValue) {
512
513 return get(request, param, defaultValue);
514 }
515
516 public static int getInteger(PortletRequest portletRequest, String param) {
517 return GetterUtil.getInteger(portletRequest.getParameter(param));
518 }
519
520 public static int getInteger(
521 PortletRequest portletRequest, String param, int defaultValue) {
522
523 return get(portletRequest, param, defaultValue);
524 }
525
526 public static int getInteger(ServiceContext serviceContext, String param) {
527 return GetterUtil.getInteger(serviceContext.getAttribute(param));
528 }
529
530 public static int getInteger(
531 ServiceContext serviceContext, String param, int defaultValue) {
532
533 return get(serviceContext, param, defaultValue);
534 }
535
536 public static int[] getIntegerValues(
537 HttpServletRequest request, String param) {
538
539 return getIntegerValues(request, param, new int[0]);
540 }
541
542 public static int[] getIntegerValues(
543 HttpServletRequest request, String param, int[] defaultValue) {
544
545 return GetterUtil.getIntegerValues(
546 request.getParameterValues(param), defaultValue);
547 }
548
549 public static int[] getIntegerValues(
550 PortletRequest portletRequest, String param) {
551
552 return getIntegerValues(portletRequest, param, new int[0]);
553 }
554
555 public static int[] getIntegerValues(
556 PortletRequest portletRequest, String param, int[] defaultValue) {
557
558 return GetterUtil.getIntegerValues(
559 portletRequest.getParameterValues(param), defaultValue);
560 }
561
562 public static int[] getIntegerValues(
563 ServiceContext serviceContext, String param) {
564
565 return getIntegerValues(serviceContext, param, new int[0]);
566 }
567
568 public static int[] getIntegerValues(
569 ServiceContext serviceContext, String param, int[] defaultValue) {
570
571 return GetterUtil.getIntegerValues(
572 serviceContext.getAttribute(param), defaultValue);
573 }
574
575 public static long getLong(HttpServletRequest request, String param) {
576 return GetterUtil.getLong(request.getParameter(param));
577 }
578
579 public static long getLong(
580 HttpServletRequest request, String param, long defaultValue) {
581
582 return get(request, param, defaultValue);
583 }
584
585 public static long getLong(PortletRequest portletRequest, String param) {
586 return GetterUtil.getLong(portletRequest.getParameter(param));
587 }
588
589 public static long getLong(
590 PortletRequest portletRequest, String param, long defaultValue) {
591
592 return get(portletRequest, param, defaultValue);
593 }
594
595 public static long getLong(ServiceContext serviceContext, String param) {
596 return GetterUtil.getLong(serviceContext.getAttribute(param));
597 }
598
599 public static long getLong(
600 ServiceContext serviceContext, String param, long defaultValue) {
601
602 return get(serviceContext, param, defaultValue);
603 }
604
605 public static long[] getLongValues(
606 HttpServletRequest request, String param) {
607
608 return getLongValues(request, param, new long[0]);
609 }
610
611 public static long[] getLongValues(
612 HttpServletRequest request, String param, long[] defaultValue) {
613
614 return GetterUtil.getLongValues(
615 request.getParameterValues(param), defaultValue);
616 }
617
618 public static long[] getLongValues(
619 PortletRequest portletRequest, String param) {
620
621 return getLongValues(portletRequest, param, new long[0]);
622 }
623
624 public static long[] getLongValues(
625 PortletRequest portletRequest, String param, long[] defaultValue) {
626
627 return GetterUtil.getLongValues(
628 portletRequest.getParameterValues(param), defaultValue);
629 }
630
631 public static long[] getLongValues(
632 ServiceContext serviceContext, String param) {
633
634 return getLongValues(serviceContext, param, new long[0]);
635 }
636
637 public static long[] getLongValues(
638 ServiceContext serviceContext, String param, long[] defaultValue) {
639
640 return GetterUtil.getLongValues(
641 serviceContext.getAttribute(param), defaultValue);
642 }
643
644 public static short getShort(HttpServletRequest request, String param) {
645 return GetterUtil.getShort(request.getParameter(param));
646 }
647
648 public static short getShort(
649 HttpServletRequest request, String param, short defaultValue) {
650
651 return get(request, param, defaultValue);
652 }
653
654 public static short getShort(PortletRequest portletRequest, String param) {
655 return GetterUtil.getShort(portletRequest.getParameter(param));
656 }
657
658 public static short getShort(
659 PortletRequest portletRequest, String param, short defaultValue) {
660
661 return get(portletRequest, param, defaultValue);
662 }
663
664 public static short getShort(ServiceContext serviceContext, String param) {
665 return GetterUtil.getShort(serviceContext.getAttribute(param));
666 }
667
668 public static short getShort(
669 ServiceContext serviceContext, String param, short defaultValue) {
670
671 return get(serviceContext, param, defaultValue);
672 }
673
674 public static short[] getShortValues(
675 HttpServletRequest request, String param) {
676
677 return getShortValues(request, param, new short[0]);
678 }
679
680 public static short[] getShortValues(
681 HttpServletRequest request, String param, short[] defaultValue) {
682
683 return GetterUtil.getShortValues(
684 request.getParameterValues(param), defaultValue);
685 }
686
687 public static short[] getShortValues(
688 PortletRequest portletRequest, String param) {
689
690 return getShortValues(portletRequest, param, new short[0]);
691 }
692
693 public static short[] getShortValues(
694 PortletRequest portletRequest, String param, short[] defaultValue) {
695
696 return GetterUtil.getShortValues(
697 portletRequest.getParameterValues(param), defaultValue);
698 }
699
700 public static short[] getShortValues(
701 ServiceContext serviceContext, String param) {
702
703 return getShortValues(serviceContext, param, new short[0]);
704 }
705
706 public static short[] getShortValues(
707 ServiceContext serviceContext, String param, short[] defaultValue) {
708
709 return GetterUtil.getShortValues(
710 serviceContext.getAttribute(param), defaultValue);
711 }
712
713 public static String getString(HttpServletRequest request, String param) {
714 return GetterUtil.getString(request.getParameter(param));
715 }
716
717 public static String getString(
718 HttpServletRequest request, String param, String defaultValue) {
719
720 return get(request, param, defaultValue);
721 }
722
723 public static String getString(
724 PortletRequest portletRequest, String param) {
725
726 return GetterUtil.getString(portletRequest.getParameter(param));
727 }
728
729 public static String getString(
730 PortletRequest portletRequest, String param, String defaultValue) {
731
732 return get(portletRequest, param, defaultValue);
733 }
734
735 public static String getString(
736 ServiceContext serviceContext, String param) {
737
738 return GetterUtil.getString(serviceContext.getAttribute(param));
739 }
740
741 public static String getString(
742 ServiceContext serviceContext, String param, String defaultValue) {
743
744 return get(serviceContext, param, defaultValue);
745 }
746
747 public static void print(HttpServletRequest request) {
748 Enumeration<String> enu = request.getParameterNames();
749
750 while (enu.hasMoreElements()) {
751 String param = enu.nextElement();
752
753 String[] values = request.getParameterValues(param);
754
755 for (int i = 0; i < values.length; i++) {
756 System.out.println(param + "[" + i + "] = " + values[i]);
757 }
758 }
759 }
760
761 public static void print(PortletRequest portletRequest) {
762 Enumeration<String> enu = portletRequest.getParameterNames();
763
764 while (enu.hasMoreElements()) {
765 String param = enu.nextElement();
766
767 String[] values = portletRequest.getParameterValues(param);
768
769 for (int i = 0; i < values.length; i++) {
770 System.out.println(param + "[" + i + "] = " + values[i]);
771 }
772 }
773 }
774
775 public static void print(ServiceContext serviceContext) {
776 Map<String, Serializable> attributes = serviceContext.getAttributes();
777
778 for (Map.Entry<String, Serializable> entry : attributes.entrySet()) {
779 System.out.println(
780 entry.getKey() + " = " + String.valueOf(entry.getValue()));
781 }
782 }
783
784 }
在上述的源代码中ParamUtil这个类又调用了GetterUtil这个类中的方法，ParamUtil这个类是干什么用的啊，估计大家会有疑问，这个很类的作用就是获取我们从界面上输入的参数，传给后台用的，比如界面上有一个输入的用户名（“username”）,你想获取的时候怎么办啊，在servlet中我们可以用request.getParamter("username");就可以得到用户名，但是在liferay中我们需要这样写，ParamUtil.getString(actionRequest,"username",StringPool.BLACK);就可以了，我首先说一下这里面的参数，第一个参数不用说大家也估计能猜出来，就是一个请求，类似于servlet中request，第二个参数就是你在界面上定义的name，第三个我特别想说一下，你说编写liferay的人是不是脑子有坑，为什么在StringPool中定义那么多的常量，明明一个 StringPool.BLANK = ""，直接在上述的方法中写一个""就可以了，为什么这个复杂，真心不明白，下面献上StringPool中的源代码
package com.liferay.portal.kernel.util;
016
017 /**
018 * @author Brian Wing Shun Chan
019 */
020 public class StringPool {
021
022 public static final String AMPERSAND = "&";
023
024 public static final String AMPERSAND_ENCODED = "&";
025
026 public static final String APOSTROPHE = "'";
027
028 public static final String AT = "@";
029
030 public static final String BACK_SLASH = "\\";
031
032 public static final String BETWEEN = "BETWEEN";
033
034 public static final String BLANK = "";
035
036 public static final String CARET = "^";
037
038 public static final String CDATA_CLOSE = "]]>";
039
040 public static final String CDATA_OPEN = "<![CDATA[";
041
042 public static final String CLOSE_BRACKET = "]";
043
044 public static final String CLOSE_CURLY_BRACE = "}";
045
046 public static final String CLOSE_PARENTHESIS = ")";
047
048 public static final String COLON = ":";
049
050 public static final String COMMA = ",";
051
052 public static final String COMMA_AND_SPACE = ", ";
053
054 public static final String DASH = "-";
055
056 public static final String DOLLAR = "$";
057
058 public static final String DOLLAR_AND_OPEN_CURLY_BRACE = "${";
059
060 public static final String DOUBLE_APOSTROPHE = "''";
061
062 public static final String DOUBLE_CLOSE_BRACKET = "]]";
063
064 public static final String DOUBLE_CLOSE_CURLY_BRACE = "}}";
065
066 public static final String DOUBLE_OPEN_BRACKET = "[[";
067
068 public static final String DOUBLE_OPEN_CURLY_BRACE = "{{";
069
070 public static final String DOUBLE_PERIOD = "..";
071
072 public static final String DOUBLE_QUOTE = "\"\"";
073
074 public static final String DOUBLE_SLASH = "//";
075
076 public static final String DOUBLE_SPACE = " ";
077
078 public static final String EXCLAMATION = "!";
079
080 public static final String EQUAL = "=";
081
082 public static final String FALSE = "false";
083
084 public static final String FORWARD_SLASH = "/";
085
086 public static final String FOUR_SPACES = " ";
087
088 public static final String GRAVE_ACCENT = "`";
089
090 public static final String GREATER_THAN = ">";
091
092 public static final String GREATER_THAN_OR_EQUAL = ">=";
093
094 public static final String INVERTED_EXCLAMATION = "\u00A1";
095
096 public static final String INVERTED_QUESTION = "\u00BF";
097
098 public static final String IS_NOT_NULL = "IS NOT NULL";
099
100 public static final String IS_NULL = "IS NULL";
101
102 public static final String ISO_8859_1 = "ISO-8859-1";
103
104 public static final String LESS_THAN = "<";
105
106 public static final String LESS_THAN_OR_EQUAL = "<=";
107
108 public static final String LIKE = "LIKE";
109
110 public static final String MINUS = "-";
111
112 public static final String NBSP = " ";
113
114 public static final String NEW_LINE = "\n";
115
116 public static final String NOT_EQUAL = "!=";
117
118 public static final String NOT_LIKE = "NOT LIKE";
119
120 public static final String NULL = "null";
121
122 public static final String OPEN_BRACKET = "[";
123
124 public static final String OPEN_CURLY_BRACE = "{";
125
126 public static final String OPEN_PARENTHESIS = "(";
127
128 public static final String PERCENT = "%";
129
130 public static final String PERIOD = ".";
131
132 public static final String PIPE = "|";
133
134 public static final String PLUS = "+";
135
136 public static final String POUND = "#";
137
138 public static final String QUESTION = "?";
139
140 public static final String QUOTE = "\"";
141
142 public static final String RETURN = "\r";
143
144 public static final String RETURN_NEW_LINE = "\r\n";
145
146 public static final String SEMICOLON = ";";
147
148 public static final String SLASH = FORWARD_SLASH;
149
150 public static final String SPACE = " ";
151
152 public static final String STAR = "*";
153
154 public static final String TAB = "\t";
155
156 public static final String TILDE = "~";
157
158 public static final String TRUE = "true";
159
160 public static final String UNDERLINE = "_";
161
162 public static final String UTC = "UTC";
163
164 public static final String UTF8 = "UTF-8";
165
166 }
上述就是获取参数的源代码，不管是什么样类型的数据，后台都可以通过这种方式获得。今天就到这，有兴趣的朋友大家可以写一个简单的页面和portlet来测试一下。
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