利用Hibernate提供的分页分页(Hibernate+Spring+Struts)

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首先：我在model(domain)先封装一个Page类

package com.bay.model;

public class Page {

private int totalRows; //总行数

private int pageSize = 12; //每页显示的行数

private int currentPage; //当前页号

private int totalPages; //总页数

private int startRow; //当前页在数据库中的起始行

public Page(int _totalRows) {

totalRows = _totalRows;

totalPages=totalRows/pageSize;

int mod=totalRows%pageSize;

if(mod>0){

totalPages++;

}

currentPage = 1;

startRow = 0;

}

public int getStartRow() {

return startRow;

}

public int getTotalPages() {

return totalPages;

}

public int getCurrentPage() {

return currentPage;

}

public int getPageSize() {

return pageSize;

}

public void setTotalRows(int totalRows) {

this.totalRows = totalRows;

}

public void setStartRow(int startRow) {

this.startRow = startRow;

}

public void setTotalPages(int totalPages) {

this.totalPages = totalPages;

}

public void setCurrentPage(int currentPage) {

this.currentPage = currentPage;

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public int getTotalRows() {

return totalRows;

}

public void first() {

currentPage = 1;

startRow = 0;

}

public void previous() {

if (currentPage == 1) {

return;

}

currentPage--;

startRow = (currentPage - 1) * pageSize;

}

public void next() {

if (currentPage < totalPages) {

currentPage++;

}

startRow = (currentPage - 1) * pageSize;

}

public void last() {

currentPage = totalPages;

startRow = (currentPage - 1) * pageSize;

}

public void refresh(int _currentPage) {

currentPage = _currentPage;

if (currentPage > totalPages) {

last();

}

本分页是针对本项目的product做的分页，DAO Interface 代码如下：

package com.bay.dao;

import java.util.List;

import com.bay.model.Product;

public interface ProductDAO extends DAO {

public List getProductByCatalogId(int pagesize,int currow,String CatalogId);

public Product getProductByProductId(String ProductId);

public List searchProductListByKeyword(String keyword);

public int getCount(String CatalogId);

}

DAO实现类：

package com.bay.dao.hibernate;

import java.util.List;

import org.hibernate.Query;

import org.hibernate.Session;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.bay.dao.ProductDAO;

import com.bay.model.Product;

public class ProductDAOHibernate extends HibernateDaoSupport implements ProductDAO {

public List getProductByCatalogId(int pagesize,int currow,String CatalogId) {

String querySentence = "from Product where catalog_id="+CatalogId+"";

Session session=this.getHibernateTemplate().getSessionFactory() .openSession();

Query query = session.createQuery(querySentence);

query.setFirstResult(currow)

.setMaxResults(pagesize);

List list = query.list();

session.close();

return list;

}

public Product getProductByProductId(String ProductId){

List productList=getHibernateTemplate().find("from Product where product_id="+ProductId+" ");

if(productList.size()>0){

return (Product)productList.get(0);

}

return null;

}

public List searchProductListByKeyword(String keyword){

Session session=this.getHibernateTemplate().getSessionFactory() .openSession();

Query q=session.createQuery("from Product where product_name=?");

q.setParameter(0, keyword);

List qlist=q.list();

session.close();

return qlist;

}

public int getCount(String CatalogId)

{

String querySentence =" select count(*) from Product where catalog_id="+CatalogId+"";

List list =this.getHibernateTemplate().find(querySentence);

Integer rows = (Integer) list.get(0);

return rows;

}

接下来就是service的接口

package com.bay.service;

import java.util.List;

import com.bay.model.Page;

import com.bay.model.Product;

public interface ProductManage {

public Product getProductById(String productId);

public List getProductByCatalogId(int pagesize,int currow,String catalogId);

public List searchProductListByKeyword(String keyword);

public int getCount(String CatalogId);

public Page getPager(String currentPage,String pageMethod,int totalRows);

}

service的接口的实现类

package com.bay.service.impl;

import java.util.List;

import com.bay.dao.ProductDAO;

import com.bay.model.Page;

import com.bay.model.Product;

import com.bay.service.ProductManage;

public class ProductManageImpl extends BaseServiceImpl implements ProductManage {

private ProductDAO productDAO=null;

public void setProductDAO(ProductDAO productDAO) {

this.productDAO = productDAO;

}

public Product getProductById(String productId){

return productDAO.getProductByProductId(productId);

}

public List getProductByCatalogId(int pagesize,int currow,String catalogId){

return productDAO.getProductByCatalogId( pagesize,currow,catalogId);

}

public List searchProductListByKeyword(String keyword){

return productDAO.searchProductListByKeyword(keyword);

}

public int getCount(String CatalogId){

return productDAO.getCount(CatalogId);

}

public Page getPager(String currentPage,String pageMethod,int totalRows){

//定义pager对象，用于传到页面

Page pager = new Page(totalRows);

//如果当前页号为空，表示为首次查询该页

//如果不为空，则刷新page对象，输入当前页号等信息

if (currentPage != null) {

pager.refresh(Integer.parseInt(currentPage));

}

//获取当前执行的方法，首页，前一页，后一页，尾页。

if (pageMethod != null) {

if (pageMethod.equals("first")) {

pager.first();

} else if (pageMethod.equals("previous")) {

pager.previous();

} else if (pageMethod.equals("next")) {

pager.next();

} else if (pageMethod.equals("last")) {

pager.last();

}

return pager;

}}

最后就是Action了：

* Generated by MyEclipse Struts

* Template path: templates/java/JavaClass.vtl

package com.bay.struts.action;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import com.bay.model.*;

/**

* MyEclipse Struts

* Creation date: 01-10-2007

* XDoclet definition:

* @struts.action

public class MainAction extends BaseAction {

* Generated Methods

/**

* Method execute

* @param mapping

* @param form

* @param request

* @param response

* @return ActionForward

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

try{

//取得Top页面的动态信息

getTopInfo(request,response);

//取到product信息

String catalogid=request.getParameter("catalogid");

if(catalogid==null||catalogid.equals("")){

catalogid="1";

}

int totalRows;//记录总行数

String currentPage = request.getParameter("currentPage");

String pageMethod = request.getParameter("pageMethod");

log.info("#######"+currentPage+"@@@@@@@@@@@"+pageMethod);

totalRows=getService().getProductManage().getCount(catalogid);

Page p=getService().getProductManage().getPager(currentPage, pageMethod, totalRows);

List productlist=getService().getProductManage().getProductByCatalogId(p.getPageSize(),p.getStartRow(),catalogid);

request.getSession().setAttribute("productlist",productlist);

request.getSession().setAttribute("page",p);

//如果用户是点击注销链接，则将登录用户信息移除出去

log.debug("DAASAsdas");

return mapping.findForward("success");

}catch(Exception e){

e.printStackTrace();

request.setAttribute("exception", e);

return mapping.findForward("error");

}

}}

web层：

<html:link action="/jsp/main.do?pageMethod=last"
paramName="page" paramProperty="currentPage" paramId="currentPage">尾页</html:link>
</td>
</tr>

</table>

各位，请多指教了．Email:wmr208@hotmail.com