分頁(yè)接口 :
?1?package?com.forum.util;
?2?
?3?
?4?public?interface?Pager
?5?{
?6?????/**?默認(rèn)第一頁(yè)號(hào)?**/
?7?????int???????FIRST_PAGE_NO?=?1;
?8?????
?9?????/**?默認(rèn)頁(yè)大小?**/
10?????int???DEFAULT_PAGE_SIZE?=?10;
11?????
12?????/**?頁(yè)大小?**/
13?????String?PAGE_SIZE_KEY?=?"PageSize";
14?????
15?????/**?頁(yè)號(hào)?**/
16?????String?PAGE_NO_KEY?=?"PageNO";
17?????
18?????/**?獲取記錄數(shù)?**/
19?????int?getRowsCount();
20?????
21?????/**?設(shè)置記錄總數(shù)?**/
22?????void?setRowsCount(?int?rowsCount?);
23?????
24?????/**?獲取總頁(yè)數(shù)?**/
25?????int?getPageCount();
26?????
27?????/**?獲取頁(yè)大小?**/
28?????int?getPageSize();
29?????
30?????/**?設(shè)置頁(yè)大小?**/
31?????void?setPageSize(?int?pageSize?);
32?????
33?????/**?獲取上一頁(yè)號(hào)?**/
34?????int?getPrevPageNO();
35?????
36?????/**?獲取上一頁(yè)鏈接?**/
37?????String?getPrevPageURL();
38?????
39?????/**?獲取下一頁(yè)號(hào)?**/
40?????int?getNextPageNO();
41?????
42?????/**?獲取下一頁(yè)鏈接?**/
43?????String?getNextPageURL();
44?????
45?????/**?獲取第一頁(yè)號(hào)?**/
46?????int?getFirstPageNO();
47?????
48?????/**?獲取第一頁(yè)鏈接?**/
49?????String?getFirstPageURL();
50?????
51?????/**?獲取最后一頁(yè)號(hào)?**/
52?????int?getLastPageNO();
53?????
54?????/**?獲取最后一頁(yè)鏈接?**/
55?????String?getLastPageURL();
56?????
57?????/**?獲取當(dāng)前頁(yè)號(hào)?**/
58?????int?getCurPageNO();
59?????
60?????/**?獲取當(dāng)前頁(yè)號(hào)鏈接?**/
61?????String?getCurPageURL();
62?????
63?????/**?獲取指定頁(yè)號(hào)的連接?**/
64?????String?getPageURL(?int?pageNO?);
65?????
66?????/**?是否有下一頁(yè)?**/
67?????boolean?hasNextPage();
68?????
69?????/**?是否有上一頁(yè)?**/
70?????boolean?hasPrevPage();
71?????
72?????/**?設(shè)置請(qǐng)求URL?**/
73?????void?setRequestURL(?String?requestURL?);
74?????
75?????/**?獲取請(qǐng)求URL?**/
76?????String?getRequestURL();
77?????
78?????/**?增加頁(yè)面參數(shù)?**/
79?????void?addParameter(String?parameterName?,?String?parameterValue);
80?????
81?????/**?獲取分頁(yè)控制條?**/
82?????String?getControlBar(?Object?parameter?);
83?}
84?
接口實(shí)現(xiàn) : SimplePager?
??1?/**
??2?????作者?：Fantasy
??3?????Email:?fantasycs@163.com
??4?????QQ???:?8635335
??5?????Blog?:?http://www.aygfsteel.com/fantasy
??6?*/
??7?package?com.forum.util;
??8?
??9?import?java.util.HashMap;
?10?import?java.util.Iterator;
?11?import?java.util.Map;
?12?
?13?/**?使用參考?JSP
?14?????<%?Pager?pager?=?new?SimplePager(memberCount?,?pageSize?,curPageNo?,?"listmembers");?%>
?15?????<a>總記錄數(shù)?:?<%=pager.getRowsCount()%> </a>
?16?????<a?href="#">當(dāng)前頁(yè)數(shù)：<span?style="color:#FF0000"><%=pager.getCurPageNO()%></span></a>
?17?????<a?href="<%=pager.getFirstPageURL()%>">第一頁(yè)</a>
?18?????<a?href="<%=pager.getPrevPageURL()%>">上一頁(yè)</a>
?19?????<a?href="<%=pager.getNextPageURL()%>">下一頁(yè)</a>
?20?????<a?href="<%=pager.getLastPageURL()%>">最后一頁(yè)</a>
?21?????跳轉(zhuǎn)到 <select?onChange="document.URL=this.value">
?22?????<%?for(?int?i?=?1?;?i?<=?pager.getPageCount()?;?i++?)?{?%>
?23?????<option?value="<%=pager.getPageURL(i)%>"?<%=?pager.getCurPageNO()?==?i???"selected"?:?""?%>>第?<%=i%>?頁(yè)</option>
?24?????<%?}?%>
?25?????<br>
?26?????<%=pager.getControlBar("center")%>
?27?????</select>
?28??**/
?29?public?class?SimplePager?implements?Pager
?30?{
?31?????private?int?rowsCount;
?32?????
?33?????private?int?pageCount;
?34?????
?35?????private?int?curPageNO;
?36?????
?37?????private?int?pageSize;
?38?????
?39?????private?String?requestURL;
?40?????
?41?????private?Map?paramter?=?new?HashMap();
?42?????
?43?????/**
?44??????*?構(gòu)造函數(shù)?★推薦使用★
?45??????*?@param?rowsCount?記錄總數(shù)
?46??????*?@param?pageSize?????每頁(yè)顯示記錄數(shù)
?47??????*?@param?curPageNO?當(dāng)前頁(yè)
?48??????*?@param?requestURL頁(yè)面訪問(wèn)URL
?49??????*?@param?Example?:?Pager?pager?=?new?SimplePager(threadsCount?,?pageSize?,curPageNo?,?"listthreads");
?50??????*?@param?保存參數(shù)[通常是保存頁(yè)面查詢條件]?:?pager.addParameter("username","root");
?51??????*?@param?保存參數(shù)[通常是保存頁(yè)面查詢條件]?:?pager.addParameter("logindate","2006-11-11");
?52??????*/
?53?????public?SimplePager(?int?rowsCount?,?int?pageSize??,?int?curPageNO?,?String?requestURL?)
?54?????{
?55?????????this.rowsCount?=?rowsCount;
?56?????????this.pageSize??=?pageSize?>?0???pageSize?:?DEFAULT_PAGE_SIZE;
?57?????????this.curPageNO?=?curPageNO?>=?FIRST_PAGE_NO????curPageNO?:?FIRST_PAGE_NO;
?58?????????this.requestURL??=?requestURL;
?59?????}
?60?????
?61?????/**
?62??????*?★不推薦使用★
?63??????*?@param?必須設(shè)置rowsCount?否則只有一頁(yè)
?64??????*?@param?必須設(shè)置pageSize??否則默認(rèn)每頁(yè)只顯示10條
?65??????*?@param?必須設(shè)置curPageNO?否則你永遠(yuǎn)都在第一頁(yè)
?66??????*?@param?必須設(shè)置requestURL否則將使用默認(rèn)請(qǐng)求地址,生成鏈接地址結(jié)果(理論上不會(huì)錯(cuò))?:?<a?href='?PageNO=2&PageSize=10'?title='第2頁(yè)'>[2]</a>
?67??????*/
?68?????public?SimplePager()
?69?????{
?70?????????this.rowsCount?=?0;
?71?????????this.pageSize??=?DEFAULT_PAGE_SIZE;
?72?????????this.curPageNO?=?FIRST_PAGE_NO;
?73?????????this.requestURL??=?"";
?74?????}
?75?????
?76?????public?int?getCurPageNO()
?77?????{
?78?????????return?curPageNO;
?79?????}
?80?????
?81?????public?int?getNextPageNO()
?82?????{
?83?????????return?curPageNO?+?1?<=?getPageCount()???curPageNO?+?1?:?getPageCount();
?84?????}
?85?????
?86?????public?void?setRowsCount(?int?rowsCount?)
?87?????{
?88?????????this.rowsCount?=?rowsCount;
?89?????}
?90?????
?91?????public?int?getRowsCount()
?92?????{
?93?????????return?rowsCount;
?94?????}
?95?????
?96?????public?String?getNextPageURL()
?97?????{
?98?????????return?getPageURL(?getNextPageNO()?);
?99?????}
100?????
101?????public?String?getPrevPageURL()
102?????{
103?????????return?getPageURL(?getPrevPageNO()?);
104?????}
105?????
106?????public?int?getPageCount()
107?????{
108?????????return?(rowsCount?>?0?&&?rowsCount?%?pageSize?==?0)???(rowsCount?/?pageSize)?:?(rowsCount/pageSize?+?1);
109?????}
110?????
111?????public?int?getPageSize()
112?????{
113?????????return?pageSize;
114?????}
115?????
116?????public?String?getCurPageURL()
117?????{
118?????????return?getPageURL(?getCurPageNO()?);
119?????}
120?????
121?????public?int?getPrevPageNO()
122?????{
123?????????return?curPageNO?-?1?>=?FIRST_PAGE_NO???curPageNO?-?1?:?FIRST_PAGE_NO?;
124?????}
125?????
126?????public?boolean?hasNextPage()
127?????{
128?????????return?curPageNO?+?1?<=?getPageCount();
129?????}
130?????
131?????public?boolean?hasPrevPage()
132?????{
133?????????return?curPageNO?-?1?>=?FIRST_PAGE_NO?;
134?????}
135?????
136?????public?void?setRequestURL(String?requestURL)
137?????{
138?????????this.requestURL?=?requestURL;
139?????}
140?????
141?????public?String?getRequestURL()
142?????{
143?????????return?requestURL;
144?????}
145?????
146?????public?void?setPageSize(int?pageSize)
147?????{
148?????????this.pageSize?=?pageSize;
149?????}
150?????
151?????public?int?getFirstPageNO()
152?????{
153?????????return?FIRST_PAGE_NO;
154?????}
155?????
156?????public?String?getFirstPageURL()
157?????{
158?????????return?getPageURL(?getFirstPageNO()?);
159?????}
160?????
161?????public?int?getLastPageNO()
162?????{
163?????????return?getPageCount();
164?????}
165?????
166?????public?String?getLastPageURL()
167?????{
168?????????return?getPageURL(?getLastPageNO()?);
169?????}
170?????
171?????public?String?getPageURL(int?pageNO)
172?????{
173?????????pageNO?=?pageNO?>=?FIRST_PAGE_NO????pageNO?:?FIRST_PAGE_NO;
174?????????pageNO?=?pageNO?<=?getPageCount()???pageNO?:?getPageCount();
175?????????StringBuffer?buffer?=?new?StringBuffer(256);
176?????????buffer.append(requestURL).append("?").append(PAGE_NO_KEY).append("=").append(?pageNO?);
177?????????buffer.append("&").append(PAGE_SIZE_KEY).append("=").append(pageSize);
178?????????return?paramter.size()?>?0???buffer.append(?getRequestParameter()?).toString()?:?buffer.toString();
179?????}
180?????
181?????public?void?addParameter(String?parameterName,?String?parameterValue)
182?????{
183?????????paramter.put(parameterName?,?parameterValue);
184?????}????
185?????
186?????/**
187??????*?生成默認(rèn)分頁(yè)工具條
188??????*?樣式?:?<<第一頁(yè)??<前十頁(yè)??[1]?[2]?[3]?[4]?[5]?[6]?[7]??后十頁(yè)>??最后一頁(yè)>>
189??????*/
190?????public?String?getControlBar(?Object?parameter?)
191?????{
192?????????int?pagesView?=?10;
193?????????int?pageCount?=?getPageCount();
194?????????int?startPageNo?=?FIRST_PAGE_NO?;
195?????????int?endPageNo?=??pageCount;
196?????????if(?pagesView?<??pageCount?)
197?????????{
198?????????????startPageNo?=?curPageNO?-?pagesView/2?>=?FIRST_PAGE_NO???curPageNO?-?pagesView/2?:?FIRST_PAGE_NO;
199?????????????startPageNo?=?startPageNo?+?pagesView?<=?pageCount???startPageNo?:?pageCount?-?pagesView;
200?????????????endPageNo???=?startPageNo?+?pagesView;
201?????????}
202?????????StringBuffer?bar?=?new?StringBuffer(1024);
203?????????bar.append("<div?id='PageControlBar'?align='"?+?parameter.toString()?+?"'>");
204?????????bar.append("<a?href='"?+?getFirstPageURL()?+?"'?title='第一頁(yè)'><span><<第一頁(yè)</span></a> ");
205?????????bar.append("<a?href='"?+?getPageURL(?curPageNO?-?10?)?+?"'?title='前10頁(yè)'><span><前十頁(yè)</span></a> ");
206?????????for(?int?i?=?startPageNo?;?i?<=?endPageNo?;?i++)
207?????????{
208?????????????bar.append(" <a?href='"?+?getPageURL(?i?)?+?"'?title='第"?+?i?+?"頁(yè)'"?+?(?i?==?curPageNO???"style='color:red;'"?:?"")?+?">["?+?i?+?"]</a>");
209?????????}
210?????????bar.append(" <a?href='"?+?getPageURL(?curPageNO?+?10?)?+?"'?title='后10頁(yè)'><span>后十頁(yè)></span></a>");
211?????????bar.append(" <a?href='"?+?getLastPageURL()?+?"'?title='最后一頁(yè)'><span>最后一頁(yè)>></span></a>");
212?????????bar.append("</div>");
213?????????return?bar.toString();
214?????}
215?????
216?????/**
217??????*?獲取自定義參數(shù)
218??????*/
219?????private?String?getRequestParameter()
220?????{
221?????????StringBuffer?buffer?=?new?StringBuffer(256);
222?????????for(?Iterator?iter?=?paramter.entrySet().iterator()?;?iter.hasNext()?;?)
223?????????{
224?????????????Map.Entry?entry?=?(Map.Entry)iter.next();
225?????????????buffer.append("&").append(?entry.getKey()).append("=").append(entry.getValue());
226?????????}
227?????????return?buffer.toString();
228?????}
229?}
230?
?若該API 有什么BUG或者設(shè)計(jì)的上的問(wèn)題請(qǐng)各位高手指教。
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Pager
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