分頁模板

package cn.jxlg.oa.domain;

import java.util.List;

/**
* 分頁功能中的一頁的信息
*
* @author tyg
*
*/
public class PageBean {

   // 指定的或是頁面參數
   private int currentPage; // 當前頁
   private int pageSize; // 每頁顯示多少條

   // 查詢數據庫
   private int recordCount; // 總記錄數
   private List recordList; // 本頁的數據列表

   // 計算
   private int pageCount; // 總頁數
   private int beginPageIndex; // 頁碼列表的開始索引（包含）
   private int endPageIndex; // 頁碼列表的結束索引（包含）

   /**
   * 只接受前4個必要的屬性，會自動的計算出其他3個屬生的值
   *
   * @param currentPage
   * @param pageSize
   * @param recordCount
   * @param recordList
   */
   public PageBean(int currentPage, int pageSize, int recordCount, List recordList) {
       this.currentPage = currentPage;
       this.pageSize = pageSize;
       this.recordCount = recordCount;
       this.recordList = recordList;

       // 計算總頁碼
       pageCount = (recordCount + pageSize - 1) / pageSize;

       // 計算 beginPageIndex 和 endPageIndex
       // >> 總頁數不多於10頁，則全部顯示
       if (pageCount <= 10) {
           beginPageIndex = 1;
           endPageIndex = pageCount;
       }
       // >> 總頁數多於10頁，則顯示當前頁附近的共10個頁碼
       else {
           // 當前頁附近的共10個頁碼（前4個 + 當前頁 + 後5個）
           beginPageIndex = currentPage - 4;
           endPageIndex = currentPage + 5;
           // 當前面的頁碼不足4個時，則顯示前10個頁碼
           if (beginPageIndex < 1) {
               beginPageIndex = 1;
               endPageIndex = 10;
           }
           // 當後面的頁碼不足5個時，則顯示後10個頁碼
           if (endPageIndex > pageCount) {
               endPageIndex = pageCount;
               beginPageIndex = pageCount - 10 + 1;
           }
       }
   }

   public List getRecordList() {
       return recordList;
   }

   public void setRecordList(List recordList) {
       this.recordList = recordList;
   }

   public int getCurrentPage() {
       return currentPage;
   }

   public void setCurrentPage(int currentPage) {
       this.currentPage = currentPage;
   }

   public int getPageCount() {
       return pageCount;
   }

   public void setPageCount(int pageCount) {
       this.pageCount = pageCount;
   }

   public int getPageSize() {
       return pageSize;
   }

   public void setPageSize(int pageSize) {
       this.pageSize = pageSize;
   }

   public int getRecordCount() {
       return recordCount;
   }

   public void setRecordCount(int recordCount) {
       this.recordCount = recordCount;
   }

   public int getBeginPageIndex() {
       return beginPageIndex;
   }

   public void setBeginPageIndex(int beginPageIndex) {
       this.beginPageIndex = beginPageIndex;
   }

   public int getEndPageIndex() {
       return endPageIndex;
   }

   public void setEndPageIndex(int endPageIndex) {
       this.endPageIndex = endPageIndex;
   }

}

使用案例

1、action調用
// 準備分頁信息, 最終版
       new QueryHelper(Reply.class, "r")//
               .addCondition("r.topic=?", topic)//
               .addOrderProperty("r.postTime", true)//
               .preparePageBean(replyService, pageNum, pageSize);

2、service調用
// 公共的查詢分頁信息的方法（最終版）
   public PageBean getPageBean(int pageNum, int pageSize, QueryHelper queryHelper) {
       System.out.println("-------> DaoSupportImpl.getPageBean( int pageNum, int pageSize, QueryHelper queryHelper )");

       // 參數列表
       List<Object> parameters = queryHelper.getParameters();

       // 查詢本頁的數據列表
       Query listQuery = getSession().createQuery(queryHelper.getListQueryHql()); // 創建查詢對象
       if (parameters != null) { // 設置參數
           for (int i = 0; i < parameters.size(); i++) {
               listQuery.setParameter(i, parameters.get(i));
           }
       }
       listQuery.setFirstResult((pageNum - 1) * pageSize);
       listQuery.setMaxResults(pageSize);
       List list = listQuery.list(); // 執行查詢

       // 查詢總記錄數量
       Query countQuery = getSession().createQuery(queryHelper.getCountQueryHql());
       if (parameters != null) { // 設置參數
           for (int i = 0; i < parameters.size(); i++) {
               countQuery.setParameter(i, parameters.get(i));
           }
       }
       Long count = (Long) countQuery.uniqueResult(); // 執行查詢

       return new PageBean(pageNum, pageSize, count.intValue(), list);
   }

3、jsp調用 jspf文件

   <%@ include file="/WEB-INF/jsp/util/pageView.jspf" %>
   <s:form action="topic_show?id=%{id}"></s:form>

頁面模板

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<div id=PageSelectorBar>
   <div id=PageSelectorMemo>
       頁次：${currentPage}/${pageCount }頁  
       每頁顯示：${pageSize }條  
       總記錄數：${recordCount }條
   </div>
   <div id=PageSelectorSelectorArea>

       <a href="javascript: gotoPage(1)" title="首頁" style="cursor: hand;">
           <img src="${pageContext.request.contextPath}/style/blue/images/pageSelector/firstPage.png"/>
       </a>

       <s:iterator begin="%{beginPageIndex}" end="%{endPageIndex}" var="num">
           <s:if test="#num == currentPage"> <%-- 當前頁 --%>
               <span class="PageSelectorNum PageSelectorSelected">${num}</span>
           </s:if>
           <s:else> <%-- 非當前頁 --%>
               <span class="PageSelectorNum" style="cursor: hand;" onClick="gotoPage(${num});">${num}</span>
           </s:else>

       </s:iterator>

       <a href="javascript: gotoPage(${pageCount})" title="尾頁" style="cursor: hand;">
           <img src="${pageContext.request.contextPath}/style/blue/images/pageSelector/lastPage.png"/>
       </a>

       轉到：
       <select οnchange="gotoPage(this.value)" id="_pn">
           <s:iterator begin="1" end="%{pageCount}" var="num">
               <option value="${num}">${num}</option>
           </s:iterator>
       </select>
       <script type="text/javascript">
           $("#_pn").val("${currentPage}");
       </script>

   </div>
</div>

<script type="text/javascript">
   function gotoPage( pageNum ){
       // window.location.href = "forum_show.action?id=${id}&pageNum=" + pageNum;

       $(document.forms[0]).append("<input type='hidden' name='pageNum' value='" + pageNum +"'>");
       document.forms[0].submit();
   }
</script>