SSH:Struts2.2+Hibernate3.6+Spring3.1分页示例[转]

参考资料 
1 ssh分页(多个例子) 
http://useryouyou.iteye.com/blog/593954 
2 ssh2分页例子 
http://459104018-qq-com.iteye.com/blog/467196 
3 ssh2分页 
http://blog.csdn.net/shmily2038/archive/2009/12/28/5090044.aspx 
注意事项: 
此示例是在:Struts2.2+Spring3.1+Hibernate3.6整合(登录示例及CRUD操作)基础上加的分页功能: 
http://liuzidong.iteye.com/blog/935493 
实现功能：分页,排序,设置每页显示多少条,转到第多少页 
调用说明: 
1  导入只需要:com.liuzd.page包下的类或者将page.jar加入WEB-INF/lib下也行^_^ 
2  Struts2前台类实现: BaseAction父类 
3  在子类方法中调用父类提供的方法: 
   Page page = executePage(querySql,totalCount," id desc "); 
   需要传递三个参数就行了: querySql(查询sql语句), totalCount(总行数), 
    " id desc "(排序的列名与排序方式) 
4 返回分页数据
List<User> users = this.userService.getUserListByPage(page); 
5 在spring配置文件中请保持有: jdbcTemplate与hibernateTemplate这二个Bean的名字,否则dbUtil类不能使用
6 具体可参见:四的说明 
一 运行环境:XP+Myeclipse6.6+WebLogic92+Oracle10g 
二 工程相关图片: 
1 DEMO图片 

2 工程代码图片 
 
3 page.jar图片 
 
三 此示例是在: 
Struts2.2+Spring3.1+Hibernate3.6整合(登录示例及CRUD操作)基础上加的分页功能: 
http://liuzidong.iteye.com/blog/935493,jar包在此页面中下载 
四 关注类及页面: 
1 BaseAction类(可能你在项目有其它的父类要使用,只要关注这个类中的: protected Page executePage(String querySql,Long totalCount,String columnNameDescOrAsc)方法就行了,方法中的参数不用修改,它来自于page.jsp,你可拷贝这个方法到你的父类中就实现了分页功能,分页类详见注释) 
2 UserAction子类(只关注:方法:userList()中的调用方式) 
3 UserDAOImpl类(关注方法:public List<User> getUserListByPage(final Page page) ) 
4 userList.jsp页面 

<%@ taglib uri="/WEB-INF/c.tld" prefix="c"%>
<c:set var="page" value="${sessionScope.page}" />

在排序处: 

<font color='red'>${page.sortName eq "username" ? page.sortInfo :page.defaultInfo}</font>

在下面加上: 

<jsp:include page="/page/page.jsp">
    <jsp:param name="url" value="userAction!userList.action" />
    <!-- 演示传值:要用%26 -->
    <jsp:param name="urlParams" value="%26age=2" />
</jsp:include>

四 要关注的类与页面 

1 BaseAction.java 

package com.liuzd.common;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.SessionAware;

import com.liuzd.page.Page;
import com.liuzd.page.PageUtil;
import com.liuzd.page.PageState;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * 基本Struts2的分页父类
 * @author liuzd
 * @version 1.0 2011-05-12
 * @since JDK1.5
 * */
public class BaseAction extends ActionSupport implements SessionAware{

    private static final long serialVersionUID = 1L;

    public void setSession(Map<String, Object> sessionMap) {

    }

    protected Map<String,Object> getMapSession(){
        return  (Map<String,Object>)ActionContext.getContext().getSession();
    }

    protected Object getMapSessionGet(String key){
        return  getMapSession().get(key);
    }

    protected void setMapSessionPut(String key,Object value){
         getMapSession().put(key, value);
    }

    /***
     * 获取请求对象
     * */
    protected HttpServletRequest getRequest(){
        return ServletActionContext.getRequest ();
    }

    /***
     * 获取会话对象
     * */
    protected javax.servlet.http.HttpSession getSession(){
        return getRequest().getSession();
    }

    /***
     * 设置请求参数
     * */
    protected void setRequestAttribute(String attribute,Object attrValue){
        getRequest().setAttribute(attribute, attrValue);
    }

    /***
     * 获取请求参数
     * */
    protected Object getRequestAttribute(String attribute){
        return getRequest().getAttribute(attribute);
    }

    /***
     * 设置Session参数与值
     * */
    protected void setSessionAttribute(String attribute,Object attrValue){
        getSession().setAttribute(attribute, attrValue);
    }

    /***
     * 获取Session参数与值
     * */
    protected Object getSessionAttribute(String attribute){
        return getSession().getAttribute(attribute);
    }


    /**
     * oracel的三层分页语句
     * 子类在展现数据前,进行分页计算!
     * @param querySql  查询的SQL语句,未进行分页
     * @param totalCount 根据查询SQL获取的总条数
     * @param columnNameDescOrAsc 列名+排序方式 : ID DESC or ASC
     */
    protected Page executePage(String querySql,Long totalCount,String columnNameDescOrAsc){
        String oracleSql = PageUtil.createQuerySql(querySql,columnNameDescOrAsc);
        if(null == totalCount){
            totalCount = 0L;
        }
        /**页面状态,这个状态是分页自带的,与业务无关*/
        String pageAction = getRequest().getParameter("pageAction");
        String value = null;
        /**获取下标判断分页状态*/
        int index = PageState.getOrdinal(pageAction);
        if(0 == index){
            /**每页显示多少条*/
            value = getRequest().getParameter("everyPage");
        }

        Page page = null;
        /**
         * index < 1 只有二种状态
         * 1 当首次调用时,分页状态类中没有值为 NULL 返回 -1
         * 2 当页面设置每页显示多少条: index=0,当每页显示多少条时,分页类要重新计算
         * */
        if(index < 1){
            page = PageUtil.inintPage(oracleSql,totalCount,index,value,getPage());
        }else{
            /**
             * 当页面排序时
             * */
            if(5 == index){
                value = getRequest().getParameter("sortName");
            /**
             * 到指定多少页
             * */
            }else if(6 == index){
                value = getRequest().getParameter("currentPage");
            }
            page = PageUtil.execPage(index,value,getPage());
        }
        setSession(page);
        return page;
    }

    private Page getPage() {
        Page page = (Page)getSession().getAttribute(PageUtil.SESSION_PAGE_KEY);
        if(page == null){
            page = new Page();
        }
        return page;
    }

    private void setSession(Page page) {
        getSession().setAttribute(PageUtil.SESSION_PAGE_KEY,page);
    }
}

2 UserAction.java 

package com.liuzd.s2sh.web;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import com.liuzd.common.BaseAction;
import com.liuzd.common.DbUtils;
import com.liuzd.page.Page;
import com.liuzd.s2sh.entity.User;
import com.liuzd.s2sh.service.UserService;

@Component("u")
@Scope("prototype")
public class UserAction extends BaseAction {

    private static final long serialVersionUID = 1L;

    private String message = null;

    private User user = null;

    private String action = null;

    public String getAction() {
        return action;
    }

    public void setAction(String action) {
        this.action = action;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public String execute() throws Exception {
        System.out.println("user: " + user);

        User dbUser = this.userService.checkUserExits(user);
        if (null != dbUser) {
            message = "用户: " + user.getUsername() + "登录成功";
            System.out.println(message);
            getMapSession().put("sessionUser", dbUser);
            return userList();
            //return "success";
        }
        message = "用户: " + user.getUsername() + "登录失败";
        return "fail";
    }

    public String loadUser() {
        action = "update";
        message = "编辑用户信息";
        User loadUser = new User();
        loadUser.setId(user.getId());
        user = this.userService.getUserByUid(loadUser);
        this.getRequest().setAttribute("myname", "天涯海角");
        this.getMapSession().put("mysex", "男");
        System.out.println("loaduser: " + user);
        return "user";
    }

    public String addUser() {
        action = "add";
        return "user";
    }

    public String saveUser() {
        this.userService.addUser(user);
        return "user";
    }

    public String delUser() {
        action = "del";
        this.userService.delUser(user);
        return userList();
    }

    public String editUser() {
        System.out.println("action: " + action + ",编辑用户: " + user);
        if ("update".equals(action)) {
            this.userService.editUser(user);
        } else if ("add".equals(action)) {
            saveUser();
        }
        return userList();
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    private UserService userService = null;
    private DbUtils dbUtil = null;

    public String userList() {
        //因为Hibernate分页的性能问题,使用原生sql来解决
        String querySql = "select * from users where 1=1 ";
        //用jdbc查询总条数
        Long totalCount = getDbUtil().getCountByQuerySql(querySql);
        //调用父类方法进行分页参数相关计算
        Page page = executePage(querySql,totalCount," id desc ");
        //返回分页数据
        List<User> users = this.userService.getUserListByPage(page);
        getRequest().setAttribute("userList",users);
        return "userList";
    }


    public UserService getUserService() {
        return userService;
    }
    @Resource
    public void setUserService(UserService userService) {
        this.userService = userService;
    }

    public DbUtils getDbUtil() {
        return dbUtil;
    }

    @Resource
    public void setDbUtil(DbUtils dbUtil) {
        this.dbUtil = dbUtil;
    }

}

3 UserDAOImpl.java 

package com.liuzd.s2sh.dao.impl;

import java.sql.SQLException;
import java.util.List;

import javax.annotation.Resource;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.stereotype.Component;

import com.liuzd.page.Page;
import com.liuzd.s2sh.dao.UserDAO;
import com.liuzd.s2sh.entity.User;

@Component("userDao")
public class UserDAOImpl implements UserDAO {

    private HibernateTemplate hibernateTemplate;

    public HibernateTemplate getHibernateTemplate() {
        return hibernateTemplate;
    }

    @Resource
    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }

    @SuppressWarnings("unchecked")
    public User getUserByUserIdAndUserNameExits(User user) {
        List<User> users = hibernateTemplate
                .find("from User u where u.username = '" + user.getUsername()
                        + "' and u.password='" + user.getPassword() + "'");

        if (users != null && users.size() > 0) {
            return users.get(0);
        }
        return null;
    }

    public void saveUser(User user) {
        this.hibernateTemplate.save(user);
    }

    public void delUser(User user) {
        User delUser = getUser(user);
        this.hibernateTemplate.delete(delUser);
    }

    @SuppressWarnings("unchecked")
    public List<User> finUserAll() {
        return this.hibernateTemplate.find("from User");
    }

    public User getUser(User user) {
        return this.hibernateTemplate.get(User.class, user.getId());
    }

    public void updateUser(User user) {
        this.hibernateTemplate.update(user);
    }


    @SuppressWarnings("unchecked")
    public Long getUserCount() {
        List list = this.getHibernateTemplate().find("select count(*) from User");
        return ((Long) list.iterator().next());
    }

    public Long getUserCount(String querySql) {
        return (Long) getHibernateTemplate().find(querySql).iterator().next();
    }

    @SuppressWarnings("unchecked")
    public List<User> getUserListByPage(final Page page) {
        return this.getHibernateTemplate().executeFind(new HibernateCallback() {
        public Object doInHibernate(Session session)
            throws HibernateException, SQLException {
                /*Query query = session.createQuery("from User");
                //性能问题所在
                query.setFirstResult(page.getBeginIndex());
                query.setMaxResults(page.getEveryPage());
                return query.list();*/

                /*  .add(Restrictions.gt("id", 2)) //greater than = id > 2
                     .add(Restrictions.lt("id", 8)) //little than = id < 8
                     .add(Restrictions.like("title", "t_"))
                     .createCriteria("category")
                     .add(Restrictions.between("id", 3, 5)) //category.id >= 3 and category.id <=5

                   .add(Expression.ge("age", new Integer(20));
                   .addOrder( Order.asc("name") )
                   .addOrder( Order.desc("age") )
                   .setMaxResults(50)
                   .list();


                   .add( Property.forName("name").like("F%") )
                   .addOrder( Property.forName("name").asc() )
                   .addOrder( Property.forName("age").desc() )
                   .setMaxResults(50)
                   .list();
                 * */

                /*Criteria c = session.createCriteria(User.class);
                String sortName = page.getSortName();
                if(StringUtils.isNotEmpty(sortName)){
                    if("asc".equals(page.getSortState())){
                        c.addOrder(org.hibernate.criterion.Order.asc(sortName));
                    }else{
                        c.addOrder(org.hibernate.criterion.Order.desc(sortName));
                    }
                }
                c.setFirstResult(page.getBeginIndex());
                c.setMaxResults(page.getEveryPage());
                return c.list();*/
                Query query = session.createSQLQuery(page.getQuerySql()).addEntity(User.class);
                return query.list();
            }
        });
    }
}

5  JSP引用 

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib uri="/WEB-INF/c.tld" prefix="c"%>
<c:set var="page" value="${sessionScope.page}" />
<html>
    <head>
        <title>用户集合</title>
    </head>

    <body>
        <table width="60%" border="1" cellpadding="0" align="center">
            <thead>
                <tr>
                    <th style="cursor: hand;" title="按姓名进行排序" onclick="sortPage('username')" valign="top">
                        姓名<font color='red'>${page.sortName eq "username" ? page.sortInfo : page.defaultInfo}</font>
                    </th>
                    <th style="cursor: hand;" title="按年龄进行排序" onclick="sortPage('age')" valign="top">
                        年龄<font color='red'>${page.sortName eq "age" ? page.sortInfo : page.defaultInfo}</font>
                    </th>
                    <th style="cursor: hand;" title="按性别进行排序" onclick="sortPage('sex')" valign="top">
                        性别<font color='red'>${page.sortName eq "sex" ? page.sortInfo : page.defaultInfo}</font>
                    </th>
                    <th style="cursor: hand;" title="按地址进行排序" onclick="sortPage('address')" valign="top">
                        地址<font color='red'>${page.sortName eq "address" ? page.sortInfo : page.defaultInfo}</font>
                    </th>
                    <th style="cursor: hand;" >
                        操作
                    </th>
                </tr>
            </thead>
            <tbody>
                <!--
                  <s:iterator value="#request.userList" status="status" >
                    <tr align="center">
                      <td><s:property value="username"/></td>
                      <td><s:property value="age"/></td>
                      <td><s:property value="sex"/></td>
                      <td><s:property value="address"/></td>
                      <td>
                        <s:a href="userAction!addUser.action">添加</s:a> | <s:a href="userAction!loadUser.action?user.id=%{id}">编辑</s:a> |
                        <a href="<s:url action="userAction!delUser.action"><s:param name="user.id" value="id"/></s:url>">删除</a>
                      </td>
                    </tr>
                 </s:iterator>
                -->

                <c:forEach items="${requestScope.userList}" var="user">
                    <tr align="center">
                        <td>
                            ${user.username}
                        </td>
                        <td>
                            ${user.age}
                        </td>
                        <td>
                            ${user.sex eq 1 ? "男" : user.sex eq 2 ? "女" : "未知"}
                        </td>
                        <td>
                            ${user.address}
                        </td>
                        <td>
                            <a
                                href="${pageContext.request.contextPath}/userAction!addUser.action">添加</a>
                            |
                            <a
                                href="${pageContext.request.contextPath}/userAction!loadUser.action?user.id=${user.id}">编辑</a>
                            |
                            <a
                                href="${pageContext.request.contextPath}/userAction!delUser.action?user.id=${user.id}">删除</a>
                        </td>
                    </tr>
                </c:forEach>

                <jsp:include page="page.jsp">
                    <jsp:param name="url" value="userAction!userList.action" />
                    <!-- 演示传值:要用%26 -->
                    <jsp:param name="urlParams" value="%26age=2" />
                </jsp:include>

            </tbody>
        </table>
        <br>
        <a href="${pageContext.request.contextPath}/Login.jsp">返回</a>
        <br>
        <s:debug></s:debug>
    </body>
</html>

五 你不需要关注的分页类与JSP页面,可在附件下载jar与源码 
1 Page.java 

package com.liuzd.page;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.builder.ToStringBuilder;

/**
 * 分页类
 * @author liuzd
 * @version 1.0 2011-05-12
 * @since JDK1.5
 * */
public class Page implements java.io.Serializable{

    private static final long serialVersionUID = 1L;
    //前一页
    private Boolean hasPrePage;
    //后一页
    private Boolean hasNextPage;
    //每页显示多少条:默认10条
    private Long everyPage = 10L;
    //总页数
    private Long totalPage;
    //当前第多少页:默认第1页
    private Long currentPage = 1L;
    //开始下标
    private Long beginIndex;
    //结束下标
    private Long endinIndex;
    //总共多少条
    private Long totalCount;
    //查询结果集语句
    private String querySql;
    //未进行分页的语句
    private String initQuerySql;
    //排序列名
    private String sortName;
    //排序状态
    private String sortState;
    //排序信息
    private String sortInfo;
    //是否排序
    private Boolean sort;
    private String defaultInfo = "  ";



    public String getDefaultInfo() {
        return defaultInfo;
    }

    public void setDefaultInfo(String defaultInfo) {
        this.defaultInfo = defaultInfo;
    }

    public String getSortInfo() {
        return sortInfo;
    }

    public void setSortInfo(String sortInfo) {
        this.sortInfo = sortInfo;
    }

    public String getSortName() {
        return sortName;
    }

    public void setSortName(String sortName) {
        setPageSortState(sortName);
    }

    public String getSortState() {
        return sortState;
    }

    public void setSortState(String sortState) {
        this.sortState = sortState;
    }

    public String getQuerySql() {
        return querySql;
    }

    public void setQuerySql(String querySql) {
        this.querySql = querySql;
    }

    public Page() {
    }

    /**
     * 常用,用于计算分页
     * */
    public Page(Long totalRecords){
        this.totalCount = totalRecords;
        setTotalPage(getTotalPage(totalRecords));
    }

    /**
     * 设置每页显示多少条时使用
     * */
    public Page(Long everyPage,Long totalRecords){
        this.everyPage = everyPage;
        this.totalCount = totalRecords;
        setTotalPage(getTotalPage(totalRecords));
    }

    /**
     * @param state   状态码
     * @param value   到第多少页或者设置每页显示多少条或者为排序列名
     */
    public void pageState(int  index,String value) {
        sort = false;
        switch (index) {
        case 0 :setEveryPage(Long.parseLong(value));break;
        case 1 :first();break;
        case 2: previous();break;
        case 3: next();break;
        case 4: last();break;
        case 5: sort = true;sort(value);break;
        case 6 ://到指定第多少页
            setCurrentPage(Long.parseLong(value));
            break;
        }
    }

    /**
     * 最前一页
     */
    private void first() {
        currentPage = 1L;
    }

    private void previous() {
        currentPage--;
    }

    private void next() {
        currentPage++;
    }

    private void last() {
        currentPage = totalPage;
    }

    private void sort(String sortName) {
        //设置排序状态
        setPageSortState(sortName);
    }



    /**
     * 计算总页数
     * */
    private Long getTotalPage(Long totalRecords) {
         Long totalPage = 0L;
         if (totalRecords % everyPage == 0)
           totalPage = totalRecords / everyPage;
         else {
           totalPage = totalRecords / everyPage + 1;
         }
         return totalPage;
    }


    public Long getBeginIndex() {
        this.beginIndex = (currentPage - 1) * everyPage;
        return this.beginIndex;
    }

    public void setBeginIndex(Long beginIndex) {
        this.beginIndex = beginIndex;
    }

    public Long getCurrentPage() {
        this.currentPage = currentPage == 0 ? 1 : currentPage;
        return this.currentPage;
    }

    public void setCurrentPage(Long currentPage) {
        if(0 == currentPage){
            currentPage = 1L;
        }
        this.currentPage = currentPage;
    }

    public Long getEveryPage() {
        this.everyPage = everyPage == 0 ? 10 : everyPage;
        return this.everyPage;
    }

    public void setEveryPage(Long everyPage) {
        this.everyPage = everyPage;
    }

    public Boolean getHasNextPage() {
        this.hasNextPage = (currentPage != totalPage) && (totalPage != 0);
        return this.hasNextPage;
    }

    public void setHasNextPage(Boolean hasNextPage) {
        this.hasNextPage = hasNextPage;
    }

    public Boolean getHasPrePage() {
        this.hasPrePage = currentPage != 1;
        return this.hasPrePage;
    }

    public void setHasPrePage(Boolean hasPrePage) {
        this.hasPrePage = hasPrePage;
    }

    public Long getTotalPage() {
        return this.totalPage;
    }

    public void setTotalPage(Long totalPage) {
        if(this.currentPage > totalPage){
            this.currentPage = totalPage;
        }
        this.totalPage = totalPage;
    }

    public Long getTotalCount() {
        return this.totalCount;
    }

    public void setTotalCount(Long totalCount) {
        setTotalPage(getTotalPage(totalCount));
        this.totalCount = totalCount;
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this);
    }

    /**
     * 设置排序状态
     * */
    private void setPageSortState(String newPageSortName){
        //判断之前的排序字段是否为空
        if(StringUtils.isEmpty(sortName)){
            //默认排序为升序
            this.sortState = PageUtil.ASC;
            this.sortInfo = PageUtil.PAGE_ASC;
        }else{
            if(StringUtils.equalsIgnoreCase(newPageSortName, sortName)){
                //判断sortState排序状态值
                if(StringUtils.equalsIgnoreCase(sortState, PageUtil.ASC)){
                    this.sortState = PageUtil.DESC;
                    this.sortInfo = PageUtil.PAGE_DESC;
                }else{
                    this.sortState = PageUtil.ASC;
                    this.sortInfo = PageUtil.PAGE_ASC;
                }
            }else{
                //默认
                this.sortState = PageUtil.ASC;
                this.sortInfo = PageUtil.PAGE_ASC;
            }
        }
        sortName = newPageSortName.toLowerCase();
    }

    public Boolean isSort() {
        return sort;
    }

    public void setSort(Boolean sort) {
        this.sort = sort;
    }


    public String getInitQuerySql() {
        return initQuerySql;
    }

    public void setInitQuerySql(String initQuerySql) {
        this.initQuerySql = initQuerySql;
    }

    public Long getEndinIndex() {
        this.endinIndex = (currentPage) * everyPage;
        return endinIndex;
    }

    public void setEndinIndex(Long endinIndex) {
        this.endinIndex = endinIndex;
    }
}

2 PageState.java 

package com.liuzd.page;

import org.apache.commons.lang3.StringUtils;

/**
 * 分页状态类
 * @author liuzd
 * @version 1.0 2011-05-12
 * @since JDK1.5
 * */
public enum PageState {

    /**
     * 设置每页显示多少条
     * */
    SETPAGE,
    /**
     * 首页
     * */
    FIRST,
    /**
     * 向前一页
     * */
    PREVIOUS,
    /**
     * 向后一页
     * */
    NEXT,
    /**
     * 末页
     * */
    LAST,
    /**
     * 排序
     * */
    SORT,
    /**
     * 到第多少页
     * */
    GOPAGE;


    /**
     * @param value 索引名称
     * @return 返回索引下标
     */
    public static int getOrdinal(String value) {
        int index = -1;
        if (StringUtils.isEmpty(value)) {
            return index;
        }
        String newValue = StringUtils.trim(value).toUpperCase();
        try {
            index = valueOf(newValue).ordinal();
        } catch (IllegalArgumentException e) {}
        return index;
    }
}

3 PageUtil.java 

package com.liuzd.page;

/**
 * 分页工具类
 * @author liuzd
 * @version 1.0 2011-05-12
 * @since JDK1.5
 * */
public class PageUtil {

    public static final String ASC = "asc";
    public static final String DESC = "desc";
    public static final String PAGE_DESC = "↓";
    public static final String PAGE_ASC = "↑";
    public static final String PAGE_NULL = "  ";
    public static final String SESSION_PAGE_KEY = "page";


    /**
     * @param querySql   查询SQL
     * @param beginIndex 开始下标
     * @param endinIndex 结束下标
     * @return
     */
    public static String getPageQuerySql(String querySql,Long beginIndex, Long endinIndex) {
        if(querySql.indexOf("where rn>") != -1 && querySql.indexOf("and rn<=") != -1){
            return querySql.toUpperCase();
        }
        return new java.lang.StringBuffer().append(querySql).append(" where rn>").append(beginIndex).append(" and rn<=").append(endinIndex).toString().toUpperCase();
    }

    /**
     * @param querySql    查询SQL
     * @param orderByName 排序列名
     * @return
     */
    @SuppressWarnings("unused")
    public static String createQuerySql(String querySql, String orderByName) {
        StringBuilder sql = new StringBuilder();
        sql.append("select ttt.* from(select tt.*,rownum rn from(");
        sql.append(querySql);
        if (org.apache.commons.lang3.StringUtils.isNotEmpty(orderByName)) {
            sql.append(" order by ").append(orderByName);
        }
        sql.append(" )tt)ttt ");
        return sql.toString();
    }

    /**
     * 取得排序名称+desc or asc
     * @param querySql 查询SQL
     * @return 返回查询语句 SELECT ... FROM TABLE  ORDER BY ID DESC 中的 ID DESC
     */
    public static String getSortDescOrAsc(String querySql) {
        /**取得ordery by之前的查询字符串*/
        querySql = querySql.toUpperCase();
        String temp = "ORDER BY";
        int orderIndex = querySql.lastIndexOf(temp);
        String newsql = querySql.substring(orderIndex);
        String temp2 = ")";
        int lastIndex = newsql.indexOf(temp2);
        String orderByName = newsql.substring(temp.length(),lastIndex).trim();
        return orderByName;
    }

    /**
     * 初始化分页类
     * @param initPageSql  未分页的查询SQL
     * @param totalCount   总行数
     * @param index        分页状态
     * @param value        只有在设置每页显示多少条时,值不会NULL,其它为NULL
     */
    public  static Page inintPage(String initPageSql,Long totalCount,Integer index,String value,Page sessionPage){
        Page page = null;
        if(index < 0){
             page = new Page(totalCount);
        }else{
             /**每页显示多少条*/
             Long everPage = null == value ? 10 : Long.parseLong(value);
             /**获取Session中的分页类,方便保存页面分页状态*/
             page = sessionPage;
             page.setEveryPage(everPage);
             page.setTotalCount(totalCount);
        }
        page.setInitQuerySql(initPageSql);
        /**对查询SQL进行分页计算*/
        String querySql = getPageQuerySql(initPageSql,page.getBeginIndex(), page.getEndinIndex());
        /**真正传递到后台执行获取分页数据的sql*/
        page.setQuerySql(querySql);
        /**保存到Session中*/
        return page;
    }




    /**
     * 当页点击：首页,前一页,后一页,末页,排序,到第多少页时进行分页操作
     * @param index 分页状态
     * @param value 排序字段名或者到第多少页
     */
    public static Page execPage(int  index,String value,Page sessionPage){

        Page page = sessionPage;

        /**调用方法进行分页计算*/
        page.pageState(index,value);
        /**未进行分页前的sql*/
        String initPageSql = page.getInitQuerySql();
        /**进行分页SQL组合*/
        String  querySql = getPageQuerySql(initPageSql,page.getBeginIndex(), page.getEndinIndex());

        /**替换排序列名*/
        if (page.isSort() == true) {
            String sortName = page.getSortName();
            if (null != sortName) {
                /**获取排序状态:值(desc or asc)*/
                String descAsc = page.getSortState();
                /**组合新的排序字段与状态*/
                String sortNameDescAsc = (" " + sortName + " " + descAsc).toUpperCase();
                /**返回之前的排序字段与状态*/
                String getOldSortName = PageUtil.getSortDescOrAsc(querySql);
                /**返回最新的排序字段与状态*/
                querySql = querySql.replace(getOldSortName,sortNameDescAsc);
            }
        }
        page.setQuerySql(querySql);
        return page;
    }

}

4 page.jsp 

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%>
<%@ taglib uri="/WEB-INF/c.tld" prefix="c"%>
<c:set var="page" value="${sessionScope.page}" />
<c:set var="path" value="${pageContext.request.contextPath}" />
<c:set var="url" value="${param.url}" />
<c:set var="urlParams" value="${param.urlParams}" />
<c:set var="pathurl" value="${path}/${url}" />
<tr>
    <td colspan="5">
        共${page.totalCount}条记录 共${page.totalPage}页 每页显示${page.everyPage}条
        当前第${page.currentPage}页&nbsp;
        <c:choose>
            <c:when test="${page.hasPrePage eq false}">
                &lt&lt首页&nbsp;&lt上页&nbsp;
            </c:when>
            <c:otherwise>
                <a href="${pathurl}?&pageAction=first${urlParams}">&lt&lt首页&nbsp;</a>&nbsp;
                <a href="${pathurl}?pageAction=previous${urlParams}" />&lt上一页</a>
            </c:otherwise>
        </c:choose>
        &nbsp;||&nbsp;
        <c:choose>
            <c:when test="${page.hasNextPage eq false}">
                &nbsp;下页&gt&nbsp;尾页&gt&gt
            </c:when>
            <c:otherwise>
                <a href="${pathurl}?&pageAction=next${urlParams}">下一页&gt&nbsp;</a>&nbsp;
                <a href="${pathurl}?pageAction=last${urlParams}" />末页&gt&gt</a>
            </c:otherwise>
        </c:choose>
        &nbsp;
        <SELECT name="indexChange" id="indexChange"
            onchange="getCurrentPage(this.value);">
            <c:forEach var="index" begin="1" end="${page.totalPage}" step="1">
                <option value="${index}" ${page.currentPage eq index ? "selected" : ""}>
                    第${index}页
                </option>
            </c:forEach>
        </SELECT>
        &nbsp;
        每页显示:<select name="everyPage" id="everyPage" onchange="setEveryPage(this.value);">
                   <c:forEach var="pageCount" begin="5" end="${page.totalCount}" step="5">
                        <option value="${pageCount}" ${page.everyPage eq pageCount ? "selected" : ""}>
                            ${pageCount}条
                        </option>
                    </c:forEach>
               </select>
    </td>
</tr>
<div style='display: none'>
    <a class=listlink id="indexPageHref" href='#'></a>
</div>
<script>
function getCurrentPage(index){
    var a = document.getElementById("indexPageHref");
    a.href = '${pathurl}?pageAction=gopage&currentPage='+index+'${urlParams}';
    a.setAttribute("onclick",'');
    a.click("return false");
}
function setEveryPage(everyPage){
    var a = document.getElementById("indexPageHref");
    var currentPage = document.getElementById('indexChange').value;
    a.href = '${pathurl}?pageAction=setpage&everyPage='+everyPage+'${urlParams}';
    a.setAttribute("onclick",'');
    a.click("return false");
}
function sortPage(sortName){
    var a = document.getElementById("indexPageHref");
    a.href = '${pathurl}?pageAction=sort&sortName='+sortName+'${urlParams}';
    a.setAttribute("onclick",'');
    a.click("return false");
}
</script>
原地址是   http://liuzidong.iteye.com/blog/1042172