想著每天能學個新東西，今天準備了這個hibernate+struts2實現頁面的分頁功能，在這里，首先要感謝

http://www.blogjava.net/rongxh7/archive/2008/11/29/243456.html

這位博友發表的博文，通過對他代碼的閱讀，從而自己實現了網頁分頁功能，以下是源代碼，如大家有需要，可以回復我，我會放出源代碼供大家下載！

1.DAO層接口的設計，定義一個PersonDAO接口，里面聲明了兩個方法：

public interface PersonDAO {public List<Person> queryByPage(String hql, int offset, int pageSize);public int getAllRowCount(String hql); }

2.DAO層接口的實現類PersonDAOImpl類，將其兩個方法實現出來：

public class PersonDAOImpl implements PersonDAO {/*** 通過hql語句得到數據庫中記錄總數*/@Overridepublic int getAllRowCount(String hql){Session session = HibernateUtil.openSession();Transaction tx = null;int allRows = 0;try{tx = session.beginTransaction();Query query = session.createQuery(hql);allRows = query.list().size();tx.commit();}catch (Exception e){if(tx != null){tx.rollback();}e.printStackTrace();}finally{HibernateUtil.closeSession(session);}return allRows;}/*** 使用hibernate提供的分頁功能，得到分頁顯示的數據*/@SuppressWarnings("unchecked")@Overridepublic List<Person> queryByPage(String hql, int offset, int pageSize){Session session = HibernateUtil.openSession();Transaction tx = null;List<Person> list = null;try{tx = session.beginTransaction();Query query = session.createQuery(hql).setFirstResult(offset).setMaxResults(pageSize);list = query.list();tx.commit();}catch (Exception e){if(tx != null){tx.rollback();}e.printStackTrace();}finally{HibernateUtil.closeSession(session);}return list;} }

3.定義了一個PageBean(每一頁所需要的內容都存放在這個PageBean里面)，里面用來存放網頁每一頁顯示的內容：

public class PageBean {private List<Person> list; //通過hql從數據庫分頁查詢出來的list集合private int allRows; //總記錄數private int totalPage; //總頁數private int currentPage; //當前頁public List<Person> getList(){return list;}public void setList(List<Person> list){this.list = list;}public int getAllRows(){return allRows;}public void setAllRows(int allRows){this.allRows = allRows;}public int getTotalPage(){return totalPage;}public void setTotalPage(int totalPage){this.totalPage = totalPage;}public int getCurrentPage(){return currentPage;}public void setCurrentPage(int currentPage){this.currentPage = currentPage;}/*** 得到總頁數* @param pageSize 每頁記錄數* @param allRows 總記錄數* @return 總頁數*/public int getTotalPages(int pageSize, int allRows){int totalPage = (allRows % pageSize == 0)? (allRows / pageSize): (allRows / pageSize) + 1;return totalPage;}/*** 得到當前開始記錄號* @param pageSize 每頁記錄數* @param currentPage 當前頁* @return*/public int getCurrentPageOffset(int pageSize, int currentPage){int offset = pageSize * (currentPage - 1);return offset;}/*** 得到當前頁， 如果為0 則開始第一頁，否則為當前頁* @param page* @return*/public int getCurPage(int page){int currentPage = (page == 0)? 1: page;return currentPage;}}

4.Service層接口設計，定義一個PersonService接口，里面聲明了一個方法，返回一個PageBean：

public interface PersonService {public PageBean getPageBean(int pageSize, int page); }

5.Service層接口實現類PersonServiceImpl類，實現唯一的方法：

public class PersonServiceImpl implements PersonService {private PersonDAO personDAO = new PersonDAOImpl();/*** pageSize為每頁顯示的記錄數* page為當前顯示的網頁*/@Overridepublic PageBean getPageBean(int pageSize, int page){PageBean pageBean = new PageBean();String hql = "from Person";int allRows = personDAO.getAllRowCount(hql);int totalPage = pageBean.getTotalPages(pageSize, allRows);int currentPage = pageBean.getCurPage(page);int offset = pageBean.getCurrentPageOffset(pageSize, currentPage);List<Person> list = personDAO.queryByPage(hql, offset, pageSize);pageBean.setList(list);pageBean.setAllRows(allRows);pageBean.setCurrentPage(currentPage);pageBean.setTotalPage(totalPage);return pageBean;} }

6.Action層設計，定義一個PersonAction：

public class PersonAction extends ActionSupport {private PersonService personService = new PersonServiceImpl();private int page;public int getPage(){return page;}public void setPage(int page){this.page = page;}@Overridepublic String execute() throws Exception{//表示每頁顯示5條記錄，page表示當前網頁PageBean pageBean = personService.getPageBean(5, page);HttpServletRequest request = ServletActionContext.getRequest();request.setAttribute("pageBean", pageBean);return SUCCESS;} }

7.輔助類設計，HibernateUtil:

public class HibernateUtil {private static SessionFactory sessionFactory;static{sessionFactory = new Configuration().configure().buildSessionFactory();}public static Session openSession(){Session session = sessionFactory.openSession();return session;}public static void closeSession(Session session){if(session != null){session.close();}}}

8.最后也就是分頁頁面顯示pagePerson.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%><html><head><base href="<%=basePath%>"><title>My JSP 'pagePerson.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script type="text/javascript">function validate(){var page = document.getElementsByName("page")[0].value;if(page > <s:property value="#request.pageBean.totalPage"/>) {alert("你輸入的頁數大于最大頁數，頁面將跳轉到首頁！");window.document.location.href = "personAction";return false;}return true;}</script></head><body><h1><font color="blue">分頁查詢</font></h1><hr><table border="1" align="center" bordercolor="yellow" width="50%"><tr><th>序號</th><th>姓名</th><th>年齡</th></tr><s:iterator value="#request.pageBean.list" id="person"><tr><th><s:property value="#person.id"/></th><th><s:property value="#person.name"/></th><th><s:property value="#person.age"/></th> </tr></s:iterator></table><center><font size="5">共<font color="red"><s:property value="#request.pageBean.totalPage"/></font>頁 </font>&nbsp;&nbsp;<font size="5">共<font color="red"><s:property value="#request.pageBean.allRows"/></font>條記錄</font><br><br><s:if test="#request.pageBean.currentPage == 1">首頁&nbsp;&nbsp;&nbsp;上一頁</s:if><s:else><a href="personAction.action">首頁</a>&nbsp;&nbsp;&nbsp;<a href="personAction.action?page=<s:property value="#request.pageBean.currentPage - 1"/>">上一頁</a></s:else><s:if test="#request.pageBean.currentPage != #request.pageBean.totalPage"><a href="personAction.action?page=<s:property value="#request.pageBean.currentPage + 1"/>">下一頁</a>&nbsp;&nbsp;&nbsp;<a href="personAction.action?page=<s:property value="#request.pageBean.totalPage"/>">尾頁</a></s:if><s:else>下一頁&nbsp;&nbsp;&nbsp;尾頁</s:else></center><br><center><form action="personAction" onsubmit="return validate();"><font size="4">跳轉至</font><input type="text" size="2" name="page">頁<input type="submit" value="跳轉"></form></center></body> </html>

至此，hibernate+struts2實現網頁分頁功能代碼部分就完畢了，像hibernate與struts的配置文件就不列出來了，那些都不是重點！

頁面效果如下:

總結

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