1 import java.util.ArrayList;
2 import java.util.List;
3
4 /**
5 *
6 * @author cheney
7 *
8 * @date Aug 31, 2012
9 */
10 public class PageModel<T> {
11 private int page = 1; // 当前页
12 public int totalPages = 0; // 总页数
13 private int pageRecorders;// 每页5条数据
14 private int totalRows = 0; // 总数据数
15 private int pageStartRow = 0;// 每页的起始数
16 private int pageEndRow = 0; // 每页显示数据的终止数
17 private boolean hasNextPage = false; // 是否有下一页
18 private boolean hasPreviousPage = false; // 是否有前一页
19 private List<T> list;
20
21 /**
22 *
23 * @param list
24 * @param pageRecorders
25 */
26 public PageModel(List<T> list, int pageRecorders) {
27 init(list, pageRecorders);// 通过对象集，记录总数划分
28 }
29
30 /** */
31 /**
32 * 初始化list，并告之该list每页的记录数
33 *
34 * @param list
35 * @param pageRecorders
36 */
37 public void init(List<T> list, int pageRecorders) {
38 this.pageRecorders = pageRecorders;
39 this.list = list;
40 totalRows = list.size();
41
42 hasPreviousPage = false;
43
44 if ((totalRows % pageRecorders) == 0) {
45 totalPages = totalRows / pageRecorders;
46 } else {
47 totalPages = totalRows / pageRecorders + 1;
48 }
49
50 if (page >= totalPages) {
51 hasNextPage = false;
52 } else {
53 hasNextPage = true;
54 }
55
56 if (totalRows < pageRecorders) {
57 this.pageStartRow = 0;
58 this.pageEndRow = totalRows;
59 } else {
60 this.pageStartRow = 0;
61 this.pageEndRow = pageRecorders;
62 }
63 }
64
65 public String displayForPage(String method) {
66 StringBuffer sb = new StringBuffer();
67 sb.append("<div class="w-page"><label class="fr">");
68
69 // 判断是否有上一页
70 if (this.isHasPreviousPage()) {
71 sb.append("<a href="javascript:void(0)" onclick="" + method
72 + "('" + String.valueOf(this.getPage() - 1)
73 + "');return false;">上一页</a>");
74 } else {
75 sb.append("<span class="disabled">上一页</span>");
76 }
77
78 // 中间显示
79 for (int i = 1; i <= this.getTotalPages(); i++) {
80 String spanClzz = "<a href="javascript:void(0)" onclick=""
81 + method + "('" + String.valueOf(i) + "');return false;">"
82 + i + "</a>";
83
84 if (this.page == i) {
85 spanClzz = "<span class='current'>" + i + "</span>";
86 }
87 sb.append(spanClzz);
88
89 // 当大于9页数的时候才进行分页显示
90 if (this.getTotalPages() - 2 > 7) {
91 if (i == 5) {
92 i = this.getTotalPages() - 2;
93 sb.append("...");
94 }
95 }
96 }
97 // 判断是否有下一页
98 if (this.isHasNextPage()) {
99 sb.append("<a href="javascript:void(0)" onclick="" + method
100 + "('" + String.valueOf(this.getPage() + 1)
101 + "');return false;">下一页</a>");
102
103 } else {
104 sb.append("<span class="disabled">下一页</span>");
105 }
106
107 sb.append("</div>");
108 return sb.toString();
109 }
110
111 public String displayForPage() {
112 StringBuffer sb = new StringBuffer();
113 sb.append("<div class="w-page"><label class="fr">");
114
115 // 判断是否有上一页
116 if (this.isHasPreviousPage()) {
117 sb
118 .append("<a href="javascript:void(0)" onclick="findDistResult('"
119 + String.valueOf(this.getPage() - 1)
120 + "');return false;">上一页</a>");
121 } else {
122 sb.append("<span class="disabled">上一页</span>");
123 }
124
125 // 中间显示
126 for (int i = 1; i <= this.getTotalPages(); i++) {
127 String spanClzz = "<a href="javascript:void(0)" onclick="findDistResult('"
128 + String.valueOf(i) + "');return false;">" + i + "</a>";
129
130 if (this.page == i) {
131 spanClzz = "<span class='current'>" + i + "</span>";
132 }
133 sb.append(spanClzz);
134
135 // 当大于9页数的时候才进行分页显示
136 if (this.getTotalPages() - 2 > 7) {
137 if (i == 5) {
138 i = this.getTotalPages() - 2;
139 sb.append("...");
140 }
141 }
142 }
143 // 判断是否有下一页
144 if (this.isHasNextPage()) {
145 sb
146 .append("<a href="javascript:void(0)" onclick="findDistResult('"
147 + String.valueOf(this.getPage() + 1)
148 + "');return false;">下一页</a>");
149
150 } else {
151 sb.append("<span class="disabled">下一页</span>");
152 }
153
154 sb.append("</div>");
155 return sb.toString();
156 }
157
158 // 判断要不要分页
159 public boolean isNext() {
160 return list.size() > 5;
161 }
162
163 public void setHasPreviousPage(boolean hasPreviousPage) {
164 this.hasPreviousPage = hasPreviousPage;
165 }
166
167 /**
168 *
169 * @return
170 */
171 public List<T> getNextPage() {
172 page = page + 1;
173 disposePage();
174 return getObjects(page);
175 }
176
177 /**
178 * 处理分页
179 */
180 private void disposePage() {
181 if (page == 0) {
182 page = 1;
183 }
184 if ((page - 1) > 0) {
185 hasPreviousPage = true;
186 } else {
187 hasPreviousPage = false;
188 }
189
190 if (page >= totalPages) {
191 hasNextPage = false;
192 } else {
193 hasNextPage = true;
194 }
195 }
196
197 /**
198 * 上一页
199 *
200 * @return
201 */
202 public List<T> getPreviousPage() {
203 page = page - 1;
204
205 if ((page - 1) > 0) {
206 hasPreviousPage = true;
207 } else {
208 hasPreviousPage = false;
209 }
210 if (page >= totalPages) {
211 hasNextPage = false;
212 } else {
213 hasNextPage = true;
214 }
215 return getObjects(page);
216 }
217
218 /**
219 * 获取第几页的内容
220 *
221 * @param page
222 * @return
223 */
224 public List<T> getObjects(int page) {
225 if (page == 0) {
226 this.setPage(1);
227 page = 1;
228 } else {
229 this.setPage(page);
230 }
231
232 this.disposePage();
233
234 if (page * pageRecorders < totalRows) {// 判断是否为最后一页
235 pageEndRow = page * pageRecorders;
236 pageStartRow = pageEndRow - pageRecorders;
237 } else {
238 pageEndRow = totalRows;
239 pageStartRow = pageRecorders * (totalPages - 1);
240 }
241
242 List<T> objects = null;
243 if (!list.isEmpty()) {
244 objects = list.subList(pageStartRow, pageEndRow);
245 }
246 return objects;
247 }
248
249 /**
250 * 第一页
251 *
252 * @return
253 */
254 public List<T> getFistPage() {
255 if (this.isNext()) {
256 return list.subList(0, pageRecorders);
257 } else {
258 return list;
259 }
260 }
261
262 /**
263 * @return the page
264 */
265 public int getPage() {
266 return page;
267 }
268
269 /**
270 * @param page
271 * the page to set
272 */
273 public void setPage(int page) {
274 this.page = page;
275 }
276
277 /**
278 * @return the totalPages
279 */
280 public int getTotalPages() {
281 return totalPages;
282 }
283
284 /**
285 * @param totalPages
286 * the totalPages to set
287 */
288 public void setTotalPages(int totalPages) {
289 this.totalPages = totalPages;
290 }
291
292 /**
293 * @return the pageRecorders
294 */
295 public int getPageRecorders() {
296 return pageRecorders;
297 }
298
299 /**
300 * @param pageRecorders
301 * the pageRecorders to set
302 */
303 public void setPageRecorders(int pageRecorders) {
304 this.pageRecorders = pageRecorders;
305 }
306
307 /**
308 * @return the totalRows
309 */
310 public int getTotalRows() {
311 return totalRows;
312 }
313
314 /**
315 * @param totalRows
316 * the totalRows to set
317 */
318 public void setTotalRows(int totalRows) {
319 this.totalRows = totalRows;
320 }
321
322 /**
323 * @return the pageStartRow
324 */
325 public int getPageStartRow() {
326 return pageStartRow;
327 }
328
329 /**
330 * @param pageStartRow
331 * the pageStartRow to set
332 */
333 public void setPageStartRow(int pageStartRow) {
334 this.pageStartRow = pageStartRow;
335 }
336
337 /**
338 * @return the pageEndRow
339 */
340 public int getPageEndRow() {
341 return pageEndRow;
342 }
343
344 /**
345 * @param pageEndRow
346 * the pageEndRow to set
347 */
348 public void setPageEndRow(int pageEndRow) {
349 this.pageEndRow = pageEndRow;
350 }
351
352 /**
353 * @return the hasNextPage
354 */
355 public boolean isHasNextPage() {
356 return hasNextPage;
357 }
358
359 /**
360 * @param hasNextPage
361 * the hasNextPage to set
362 */
363 public void setHasNextPage(boolean hasNextPage) {
364 this.hasNextPage = hasNextPage;
365 }
366
367 /**
368 * @return the list
369 */
370 public List<T> getList() {
371 return list;
372 }
373
374 /**
375 * @param list
376 * the list to set
377 */
378 public void setList(List<T> list) {
379 this.list = list;
380 }
381
382 /**
383 * @return the hasPreviousPage
384 */
385 public boolean isHasPreviousPage() {
386 return hasPreviousPage;
387 }
388
389 /*
390 *
391 * @param args
392 */
393 public static void main(String[] args) {
394
395 List<String> list = new ArrayList<String>();
396
397 list.add("a");
398 list.add("b");
399 list.add("c");
400 list.add("d");
401 list.add("e");
402 list.add("f");
403 list.add("g");
404 list.add("h");
405 list.add("h");
406 list.add("i");
407 list.add("j");
408
409 System.out.println(list.size());
410
411 PageModel<String> pm = new PageModel<String>(list, 3);// 每页显示条数
412
413 pm.getObjects(1);
414
415 System.out.println(pm.displayForPage("disResult"));
416 }
417
418 }
