下载后导入项目到 MyEclipse , 然后修改数据库连接参数即可测试. 我这用的是 MySQL 数据库. 用 JSP 是因为 Hibernate 可以配合各种框架, 因此在代码里我已经尽量的把页面和后台的直接变量耦合分隔开了.
hibernate_page.zip 433KB
部分代码显示:
相关 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, '张三', '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, '马六', 'beansoft', 6);
insert into user values(7, '黑七', 'beansoft', 7);
insert into user values(8, '腊八', 'beansoft', 8);
insert into user values(9, '陆九', 'beansoft', 9);
insert into user values(10, '茅十八', 'beansoft', 10);
前台 JSP 代码:
<%@ page language="java" import="manager.*,java.util.*" pageEncoding="GBK"%>
<%@ page contentType="text/html;charset=GBK"%>
<%-- 我们使用 JSTL 来访问数据 --%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
// 以下代码为业务逻辑代码, 应该放在 Servlet 或者 Struts 的 Action 或者其它框架的业务代码部分, 这些代码和当前页面是独立的
// {{{
// 分析当前页码
String pageString=request.getParameter("page");
if(pageString == null || pageString.length() == 0) {
pageString = "1";
}
int currentPage= 0 ;
try {
currentPage = Integer.parseInt(pageString);// 当前页码
} catch(Exception e) {}
if(currentPage == 0) {
currentPage = 1;
}
int pageSize = 3;//每页显示的数据数
// 读取数据
UserManager manager = new UserManager();
List users = manager.findPagedAll(currentPage, pageSize);
request.setAttribute("users",users);// 保存用户列表
request.setAttribute("totalPage", manager.getTotalPage(pageSize));// 保存总页数
request.setAttribute("totalCount", manager.getUserTotalCount());// 保存记录总数
request.setAttribute("currentPage", currentPage);// 保存当前页码
// }}}
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>用户列表页面</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>用户列表<br>
<%-- 输出用户列表 --%>
总用户:${totalCount}个用户<br>
<table width="80%" border="0">
<tr>
<td><b>用户ID</b></td>
<td><b>用户名</b></td>
<td><b>操作</b></td>
</tr>
<c:forEach items="${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}页/共${totalPage}页
<%-- 输出页面跳转代码, 分链接和静态文字两种 --%>
<c:if test="${currentPage > 1}">
[ <a href="${pageContext.request.contextPath}/index.jsp?page=${currentPage-1}">上一页</a> ]
</c:if>
<c:if test="${currentPage <= 1}">
[ 上一页 ]
</c:if>
<c:if test="${currentPage < totalPage}">
[ <a href="${pageContext.request.contextPath}/index.jsp?page=${currentPage+1}">下一页</a> ]
</c:if>
<c:if test="${currentPage >= totalPage}">
[ 下一页 ]
</c:if>
<%-- 输出 JavaScript 跳转代码 --%>
转到
<script>
// 页面跳转函数
// 参数: 包含页码的选择框(SELECT元素)
function jumpPage(select) {
var newUrl = "${pageContext.request.contextPath}/index.jsp?page=" + select.value;
//alert(newUrl);
document.location = newUrl;
}
</script>
<!-- 输出 HTML SELECT 元素, 并选中当前页面编码 -->
<select onchange='jumpPage(this);'>
<c:forEach var="i" begin="1" end="${totalPage}">
<option value="${i}"
<c:if test="${currentPage == i}">
selected
</c:if>
>第${i}页</option>
</c:forEach>
</select>
</body>
</html>
后台 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();
}
/**
* 得到用户总数
*
* @return 用户记录总数
*/
public int getUserTotalCount() {
Query q = getSession().createQuery("select count(*) from User");
List cc = q.list();
Integer a = (Integer) cc.get(0);
return a.intValue();
}
/**
* 分页显示用户数据.
*
* @param currentPage
* 当前页码, 从 1 开始
* @param pageSize
* 每页显示数据量
* @return 用户数据
*/
public List findPagedAll(int currentPage, int pageSize) {
log.debug("分页查找");
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;
}
}
}
后台 Manager:
/**
*
*/
package manager;
import java.util.List;
/**
* 用户管理类
*
* @author Administrator
*
*/
public class UserManager {
/** 用户管理 DAO */
private dao.UserDAO userDAO = new dao.UserDAO();
/**
* 得到用户总数
* @return 用户记录总数
*/
public int getUserTotalCount(){
return userDAO.getUserTotalCount();
}
/**
* 获取总页面数.
*
* @param pageSize
* 一页显示数据量
* @return 页面总数
*/
public int getTotalPage(int pageSize) {
int totalCount = userDAO.getUserTotalCount();
// 得到页面总数
int totalPageCount = ((totalCount + pageSize) - 1) / pageSize;
return totalPageCount;
}
/**
* 分页显示用户数据.
* @param currentPage 当前页码, 从 1 开始
* @param pageSize 每页显示数据量
* @return 用户数据
*/
public List findPagedAll(int currentPage, int pageSize) {
return userDAO.findPagedAll(currentPage, pageSize);
}
}
文章来源:
http://www.blogjava.net/beansoft/archive/2007/10/05/150583.html