想著每天能學(xué)個新東西，今天準(zhǔn)備了這個hibernate+struts2實現(xiàn)頁面的分頁功能，以下是源代碼。
1.DAO層接口的設(shè)計，定義一個PersonDAO接口，里面聲明了兩個方法：
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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(xiàn)類PersonDAOImpl類，將其兩個方法實現(xiàn)出來：
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public class PersonDAOImpl implements PersonDAO{ /** * 通過hql語句得到數(shù)據(jù)庫中記錄總數(shù) */ @Override public 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(shù)據(jù) */ @SuppressWarnings("unchecked") @Override public 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(nèi)容都存放在這個PageBean里面)，里面用來存放網(wǎng)頁每一頁顯示的內(nèi)容：
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public class PageBean{ private List<Person> list; //通過hql從數(shù)據(jù)庫分頁查詢出來的list集合 private int allRows; //總記錄數(shù) private int totalPage; //總頁數(shù) private int currentPage; //當(dāng)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(shù) * @param pageSize 每頁記錄數(shù) * @param allRows 總記錄數(shù) * @return 總頁數(shù) */ public int getTotalPages(int pageSize, int allRows) { int totalPage = (allRows % pageSize == 0)? (allRows / pageSize): (allRows / pageSize) + 1; return totalPage; } /** * 得到當(dāng)前開始記錄號 * @param pageSize 每頁記錄數(shù) * @param currentPage 當(dāng)前頁 * @return */ public int getCurrentPageOffset(int pageSize, int currentPage) { int offset = pageSize * (currentPage - 1); return offset; } /** * 得到當(dāng)前頁， 如果為0 則開始第一頁，否則為當(dāng)前頁 * @param page * @return */ public int getCurPage(int page) { int currentPage = (page == 0)? 1: page; return currentPage; } } |
4.Service層接口設(shè)計，定義一個PersonService接口，里面聲明了一個方法，返回一個PageBean：
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public interface PersonService{ public PageBean getPageBean(int pageSize, int page);} |
5.Service層接口實現(xiàn)類PersonServiceImpl類，實現(xiàn)唯一的方法：
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public class PersonServiceImpl implements PersonService{ private PersonDAO personDAO = new PersonDAOImpl(); /** * pageSize為每頁顯示的記錄數(shù) * page為當(dāng)前顯示的網(wǎng)頁 */ @Override public 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(shè)計，定義一個PersonAction：
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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; } @Override public String execute() throws Exception { //表示每頁顯示5條記錄，page表示當(dāng)前網(wǎng)頁 PageBean pageBean = personService.getPageBean(5, page); HttpServletRequest request = ServletActionContext.getRequest(); request.setAttribute("pageBean", pageBean); return SUCCESS; }} |
7.輔助類設(shè)計，HibernateUtil:
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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：
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<%@ 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(shù)大于最大頁數(shù)，頁面將跳轉(zhuǎn)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> <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 上一頁 </s:if> <s:else> <a href="personAction.action">首頁</a> <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> <a href="personAction.action?page=<s:property value="#request.pageBean.totalPage"/>">尾頁</a> </s:if> <s:else> 下一頁 尾頁 </s:else> </center><br> <center> <form action="personAction" onsubmit="return validate();"> <font size="4">跳轉(zhuǎn)至</font> <input type="text" size="2" name="page">頁 <input type="submit" value="跳轉(zhuǎn)"> </form> </center> </body></html> |
至此，hibernate+struts2實現(xiàn)網(wǎng)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:
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://www.cnblogs.com/xiaoluo501395377/archive/2012/10/18/2730073.html
