您的位置：首页 > Web前端 > JavaScript

用 MyEclipse 开发的 Hibernate + JSP 分页代码

2007-10-06 10:22 671 查看

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 432KB

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"%>
<%   1: -- 我们使用 JSTL 来访问数据 --

%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%

1:

2: String path = request.getContextPath();

3: String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>
<%

1:

2: // 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

3: // {{{

4:

5: // 分析当前页

6: String pageString=request.getParameter("page");

7: if(pageString == null || pageString.length() == 0) {

8:     pageString = "1";

9: }

10: int currentPage=Integer.parseInt(pageString);// 当前页码

11: if(currentPage == 0) {

12:     currentPage = 1;

13: }

14:

15: int pageSize = 2;//每页显示的数据数

16: // 读取数据

17: UserManager manager = new UserManager();

18: List users = manager.findPagedAll(currentPage, pageSize);

19:

20: request.setAttribute("users",users);// 保存用户列表

21:

22: request.setAttribute("totalPage", manager.getTotalPage(pageSize));// 保存总页数

23: request.setAttribute("totalCount", manager.getUserTotalCount());// 保存记录总数

24: request.setAttribute("currentPage", currentPage);// 保存当前页码

25: // }}}

%>
<!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>
<%

1: -- 输出用户列表 --

%>
总用户:${totalCount}个用户<br>
<table width="80%" border="0">
<tr>
<td><b>用户ID</b></td>
<td><b>用户名</b></td>
</tr>
<c:forEach items="${users}" var="user" >
<tr>
<td>${user.id}</td>
<td>${user.username}</td>
</tr>
</c:forEach>
</table>
第${currentPage}页/共${totalPage}页
<%

1: -- 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>
<%

1: -- 输出 JavaScript 跳转代码 --

%>
转到
<script>

1:

2:     // 页面跳转函数

3:     // 参数: 包含网址的选择框(SELECT元素)

4:   function jumpPage(select) {

5:         var newUrl = "${pageContext.request.contextPath}/index.jsp?page=" + select.value;

6:         //alert(newUrl);

7:         document.location = newUrl;

8:     }

9:

</script>

<select onchange='jumpPage(this);'>
<c:forEach var="i" begin="0" end="${totalPage - 1}">
<option value="${i}" <c:if test="${currentPage == i+1}">
selected
</c:if> >${i+1}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);
}
}

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航