以下是介紹利用List的subList方法實現對List分頁，廢話不多說了，直接看代碼把
java" id="highlighter_915564">
|
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
|
/** *//** * List分頁 * 實現：利用List的獲取子List方法，實現對List的分頁 * @author 顯武 * @date 2010-1-8 16:27:31 * */ import java.util.ArrayList; import java.util.List; public class PageModel { private int page = 1; // 當前頁 public int totalPages = 0; // 總頁數 private int pageRecorders;// 每頁5條數據 private int totalRows = 0; // 總數據數 private int pageStartRow = 0;// 每頁的起始數 private int pageEndRow = 0; // 每頁顯示數據的終止數 private boolean hasNextPage = false; // 是否有下一頁 private boolean hasPreviousPage = false; // 是否有前一頁 private List list; // private Iterator it; public PageModel(List list, int pageRecorders) { init(list, pageRecorders);// 通過對象集，記錄總數劃分 } /** *//** * 初始化list，并告之該list每頁的記錄數 * @param list * @param pageRecorders */ public void init(List list, int pageRecorders) { this.pageRecorders = pageRecorders; this.list = list; totalRows = list.size(); // it = list.iterator(); hasPreviousPage = false; if ((totalRows % pageRecorders) == 0) { totalPages = totalRows / pageRecorders; } else { totalPages = totalRows / pageRecorders + 1; } if (page >= totalPages) { hasNextPage = false; } else { hasNextPage = true; } if (totalRows < pageRecorders) { this.pageStartRow = 0; this.pageEndRow = totalRows; } else { this.pageStartRow = 0; this.pageEndRow = pageRecorders; } } // 判斷要不要分頁 public boolean isNext() { return list.size() > 5; } public void setHasPreviousPage(boolean hasPreviousPage) { this.hasPreviousPage = hasPreviousPage; } public String toString(int temp) { String str = Integer.toString(temp); return str; } public void description() { String description = "共有數據數:" + this.getTotalRows() + "共有頁數: " + this.getTotalPages() + "當前頁數為:" + this.getPage() + " 是否有前一頁: " + this.isHasPreviousPage() + " 是否有下一頁:" + this.isHasNextPage() + " 開始行數:" + this.getPageStartRow() + " 終止行數:" + this.getPageEndRow(); System.out.println(description); } public List getNextPage() { page = page + 1; disposePage(); System.out.println("用戶凋用的是第" + page + "頁"); this.description(); return getObjects(page); } /** *//** * 處理分頁 */ private void disposePage() { if (page == 0) { page = 1; } if ((page - 1) > 0) { hasPreviousPage = true; } else { hasPreviousPage = false; } if (page >= totalPages) { hasNextPage = false; } else { hasNextPage = true; } } public List getPreviousPage() { page = page - 1; if ((page - 1) > 0) { hasPreviousPage = true; } else { hasPreviousPage = false; } if (page >= totalPages) { hasNextPage = false; } else { hasNextPage = true; } this.description(); return getObjects(page); } /** *//** * 獲取第幾頁的內容 * * @param page * @return */ public List getObjects(int page) { if (page == 0) this.setPage(1); else this.setPage(page); this.disposePage(); if (page * pageRecorders < totalRows) {// 判斷是否為最后一頁 pageEndRow = page * pageRecorders; pageStartRow = pageEndRow - pageRecorders; } else { pageEndRow = totalRows; pageStartRow = pageRecorders * (totalPages - 1); } List objects = null; if (!list.isEmpty()) { objects = list.subList(pageStartRow, pageEndRow); } //this.description(); return objects; } public List getFistPage() { if (this.isNext()) { return list.subList(0, pageRecorders); } else { return list; } } public boolean isHasNextPage() { return hasNextPage; } public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; } public List getList() { return list; } public void setList(List list) { this.list = list; } public int getPage() { return page; } public void setPage(int page) { this.page = page; } public int getPageEndRow() { return pageEndRow; } public void setPageEndRow(int pageEndRow) { this.pageEndRow = pageEndRow; } public int getPageRecorders() { return pageRecorders; } public void setPageRecorders(int pageRecorders) { this.pageRecorders = pageRecorders; } public int getPageStartRow() { return pageStartRow; } public void setPageStartRow(int pageStartRow) { this.pageStartRow = pageStartRow; } public int getTotalPages() { return totalPages; } public void setTotalPages(int totalPages) { this.totalPages = totalPages; } public int getTotalRows() { return totalRows; } public void setTotalRows(int totalRows) { this.totalRows = totalRows; } public boolean isHasPreviousPage() { return hasPreviousPage; } } //測試類： package com.Gavin.tools.util; import java.util.ArrayList; import java.util.List; public class TestPagerModel { public static void main(String args[]) { List<String> list = new ArrayList<String>(); list.add("a"); list.add("b"); list.add("c"); list.add("d"); list.add("e"); list.add("f"); list.add("g"); list.add("h"); list.add("h"); list.add("i"); list.add("j"); list.add("k"); list.add("l"); list.add("m"); PageModel pm = new PageModel(list, 5); List sublist = pm.getObjects(3); for(int i = 0; i < sublist.size(); i++) { System.out.println(sublist.get(i)); } System.out.println(sublist.get(0)); } } |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
