部分代碼顯示:
相關 SQL:
CREATE TABLE `user` ( `id` int(11) NOT NULL, `username` varchar(200) NOT NULL, `password` varchar(20) NOT NULL, `age` int, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=GBK; -- JDBC Driver Name: com.mysql.jdbc.Driver -- JDBC Driver URL: jdbc:mysql://hostname/dbname?useUnicode=true&characterEncoding=GBK
insert into user values(1, '中文', 'beansoft', 1); insert into user values(2, 'BeanSoft', 'beansoft', 2); insert into user values(3, '張三', 'beansoft', 3); insert into user values(4, '李四', 'beansoft', 4); insert into user values(5, '王五', 'beansoft', 5); insert into user values(6, '馬六', 'beansoft', 6); insert into user values(7, '黑七', 'beansoft', 7); insert into user values(8, '臘八', 'beansoft', 8); insert into user values(9, '陸九', 'beansoft', 9); insert into user values(10, '茅十八', 'beansoft', 10);
前臺 JSP 代碼:
<%@ page language="java" import="manager.*,java.util.*" pageEncoding="GBK"%> <%@ page contentType="text/html;charset=GBK"%> <%-- 我們使用 JSTL 來訪問數據 --%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <% // 以下代碼爲業務邏輯代碼, 應該放在 Servlet 或者 Struts 的 Action 或者其它框架的業務代碼部分, 這些代碼和當前頁面是獨立的 // {{{ // 分析當前頁碼 String pageString=request.getParameter("page"); if(pageString == null || pageString.length() == 0) { pageString = "1"; } int currentPage= 0 ; try { currentPage = Integer.parseInt(pageString);// 當前頁碼 } catch(Exception e) {} if(currentPage == 0) { currentPage = 1; } int pageSize = 3;//每頁顯示的數據數 // 讀取數據 UserManager manager = new UserManager(); List users = manager.findPagedAll(currentPage, pageSize); request.setAttribute("users",users);// 保存用戶列表 request.setAttribute("totalPage", manager.getTotalPage(pageSize));// 保存總頁數 request.setAttribute("totalCount", manager.getUserTotalCount());// 保存記錄總數 request.setAttribute("currentPage", currentPage);// 保存當前頁碼 // }}} %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>用戶列表頁面</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> </head> <body>用戶列表<br> <%-- 輸出用戶列表 --%> 總用戶:${totalCount}個用戶<br> <table width="80%" border="0"> <tr> <td><b>用戶ID</b></td> <td><b>用戶名</b></td> <td><b>操作</b></td> </tr> <c:forEach items="${users}" var="user" > <tr> <td>${user.id}</td> <td>${user.username}</td> <td><a href="edit.jsp?id=${user.id}">修改</a></td> </tr> </c:forEach> </table> 第${currentPage}頁/共${totalPage}頁 <%-- 輸出頁面跳轉代碼, 分鏈接和靜態文字兩種 --%> <c:if test="${currentPage > 1}"> [ <a href="${pageContext.request.contextPath}/index.jsp?page=${currentPage-1}">上一頁</a> ] </c:if> <c:if test="${currentPage <= 1}"> [ 上一頁 ] </c:if> <c:if test="${currentPage < totalPage}"> [ <a href="${pageContext.request.contextPath}/index.jsp?page=${currentPage+1}">下一頁</a> ] </c:if> <c:if test="${currentPage >= totalPage}"> [ 下一頁 ] </c:if> <%-- 輸出 JavaScript 跳轉代碼 --%> 轉到 <script> // 頁面跳轉函數 // 參數: 包含頁碼的選擇框(SELECT元素) function jumpPage(select) { var newUrl = "${pageContext.request.contextPath}/index.jsp?page=" + select.value; //alert(newUrl); document.location = newUrl; } </script> <!-- 輸出 HTML SELECT 元素, 並選中當前頁面編碼 --> <select οnchange='jumpPage(this);'> <c:forEach var="i" begin="1" end="${totalPage}"> <option value="${i}" <c:if test="${currentPage == i}"> selected </c:if> >第${i}頁</option> </c:forEach> </select> </body> </html>
後臺 DAO:
package dao; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.LockMode; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.criterion.Example; import util.HibernateSessionFactory; /** * Data access object (DAO) for domain model class User. * * @see dao.User * @author MyEclipse Persistence Tools */ public class UserDAO { private static final Log log = LogFactory.getLog(UserDAO.class); // property constants public static final String USERNAME = "username"; public static final String PASSWORD = "password"; public static final String AGE = "age"; public Session getSession() { return HibernateSessionFactory.getSession(); } /** * 得到用戶總數 * * @return 用戶記錄總數 */ public int getUserTotalCount() { Query q = getSession().createQuery("select count(*) from User"); List cc = q.list(); Integer a = (Integer) cc.get(0); return a.intValue(); } /** * 分頁顯示用戶數據. * * @param currentPage * 當前頁碼, 從 1 開始 * @param pageSize * 每頁顯示數據量 * @return 用戶數據 */ public List findPagedAll(int currentPage, int pageSize) { log.debug("分頁查找"); try { if (currentPage == 0) { currentPage = 1; } String queryString = "from User"; Query queryObject = getSession().createQuery(queryString); queryObject.setFirstResult((currentPage - 1) * pageSize); queryObject.setMaxResults(pageSize); return queryObject.list(); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public void save(User transientInstance) { log.debug("saving User instance"); try { getSession().save(transientInstance); log.debug("save successful"); } catch (RuntimeException re) { log.error("save failed", re); throw re; } } public void delete(User persistentInstance) { log.debug("deleting User instance"); try { getSession().delete(persistentInstance); log.debug("delete successful"); } catch (RuntimeException re) { log.error("delete failed", re); throw re; } } public User findById(java.lang.Integer id) { log.debug("getting User instance with id: " + id); try { User instance = (User) getSession().get("dao.User", id); return instance; } catch (RuntimeException re) { log.error("get failed", re); throw re; } } public List findByExample(User instance) { log.debug("finding User instance by example"); try { List results = getSession().createCriteria("dao.User").add( Example.create(instance)).list(); log.debug("find by example successful, result size: " + results.size()); return results; } catch (RuntimeException re) { log.error("find by example failed", re); throw re; } } public List findByProperty(String propertyName, Object value) { log.debug("finding User instance with property: " + propertyName + ", value: " + value); try { String queryString = "from User as model where model." + propertyName + "= ?"; Query queryObject = getSession().createQuery(queryString); queryObject.setParameter(0, value); return queryObject.list(); } catch (RuntimeException re) { log.error("find by property name failed", re); throw re; } } public List findByUsername(Object username) { return findByProperty(USERNAME, username); } public List findByPassword(Object password) { return findByProperty(PASSWORD, password); } public List findByAge(Object age) { return findByProperty(AGE, age); } public List findAll() { log.debug("finding all User instances"); try { String queryString = "from User"; Query queryObject = getSession().createQuery(queryString); return queryObject.list(); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public User merge(User detachedInstance) { log.debug("merging User instance"); try { User result = (User) getSession().merge(detachedInstance); log.debug("merge successful"); return result; } catch (RuntimeException re) { log.error("merge failed", re); throw re; } } public void attachDirty(User instance) { log.debug("attaching dirty User instance"); try { getSession().saveOrUpdate(instance); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public void attachClean(User instance) { log.debug("attaching clean User instance"); try { getSession().lock(instance, LockMode.NONE); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } }
後臺 Manager:
/** * */ package manager; import java.util.List; /** * 用戶管理類 * * @author Administrator * */ public class UserManager { /** 用戶管理 DAO */ private dao.UserDAO userDAO = new dao.UserDAO(); /** * 得到用戶總數 * @return 用戶記錄總數 */ public int getUserTotalCount(){ return userDAO.getUserTotalCount(); } /** * 獲取總頁面數. * * @param pageSize * 一頁顯示數據量 * @return 頁面總數 */ public int getTotalPage(int pageSize) { int totalCount = userDAO.getUserTotalCount(); // 得到頁面總數 int totalPageCount = ((totalCount + pageSize) - 1) / pageSize; return totalPageCount; } /** * 分頁顯示用戶數據. * @param currentPage 當前頁碼, 從 1 開始 * @param pageSize 每頁顯示數據量 * @return 用戶數據 */ public List findPagedAll(int currentPage, int pageSize) { return userDAO.findPagedAll(currentPage, pageSize); } }