hibernate+pageBean实现分页dao层功能代码

今天闲来无事，摆弄了一下分页，突然发现很多代码长时间不用就生梳了，虽然有些基础，但没有一篇整合的。这里还是简单示例，主要是以后自己翻着看不用百度找啊找找不到一篇想要的

1、PageBean实体类，一页出的内容全都有

 package entity;

 import java.util.List;

 /**
  * 定义一个分页对象
  * @author 0
  *
  */
 public class PageBean<T> {
     private int pageNo;//当前页码
     private int totalPageCount;//总页码
     private int totalCount;//总条数
     private int pageSize=3;//每页显示条数
     private int upPageNo;//上一页
     private int nextPageNo;//下一页
     //一页返回的数据集合
     private List<?> list;
     public int getPageNo() {
         return pageNo;
     }
     public void setPageNo(int pageNo) {
         //如果当前页码大于0，才设置当前页码值
         if(pageNo>0){
             this.pageNo=pageNo;
         }
     }
     public int getTotalPageCount() {
         return totalPageCount;
     }
     public void setTotalPageCount(int totalPageCount) {
         if(this.getTotalCount()%this.pageSize==0){
             this.totalPageCount=this.getTotalCount()/this.pageSize;
         }else if(this.getTotalCount()%this.pageSize >0){
             this.totalPageCount=this.getTotalCount()/this.pageSize +1;
         }else{
             this.totalPageCount = 0;
         }
     }
     public int getTotalCount() {
         return totalCount;
     }
     public void setTotalCount(int totalCount) {
         this.totalCount = totalCount;
     }
     public int getPageSize() {
         return pageSize;
     }
     public void setPageSize(int pageSize) {
         this.pageSize = pageSize;
     }
     public int getUpPageNo() {
         return upPageNo;
     }
     //对上一页进行判断
     public void setUpPageNo(int upPageNo) {
         //如果当前页>1
         if(this.pageNo>1){
             this.upPageNo = this.pageNo-1;
         }
     }

     public int getNextPageNo() {
         return nextPageNo;
     }
     //对下一页进行判断
     public void setNextPageNo(int nextPageNo) {
         //如果当前页>0且小于总页数，则可以有下一页
         if(this.pageNo>0 && this.pageNo < this.totalPageCount){
             this.upPageNo = this.pageNo+1;
         }
     }

     public List<?> getList() {
         return list;
     }
     public void setList(List<?> list) {
         this.list = list;
     }

 }

2、dao层实现类，这里框架用的hibernate。hibernate作dao层的数据处理，真是太方便了

 package dao.impl;

 import java.util.List;

 import org.hibernate.Query;
 import org.hibernate.Session;

 import util.HibernateSessionFactory;

 import dao.InfoMationDao;
 import entity.Info;
 import entity.PageBean;

 public class InfoMationDaoImpl implements InfoMationDao {

     public PageBean<Info> getInfoByPage(int pageNo, String where) {
         Session session=HibernateSessionFactory.getSession();
         PageBean<Info> pagebean=new PageBean<Info>();

         try {

             //求数据总量
             int totalCount = ((Number) session.createQuery("select count(*) as count from Info where 1=1 "+where).uniqueResult()).intValue() ;
             //总数、当前页、总页数
             pagebean.setTotalCount(totalCount);
             pagebean.setPageNo(pageNo);
             pagebean.setTotalPageCount(totalCount/pagebean.getPageSize());
             pagebean.setUpPageNo(pageNo-1);
             pagebean.setNextPageNo(pageNo+1);

             //建立查询
             Query query = session.createQuery("from Info where 1=1 "+where);
             //设置起始行pageSize*pageNo,(pageNo-1)*pageSize
             query.setFirstResult((pageNo-1)*pagebean.getPageSize());
             //设置每页条数
             query.setMaxResults(pagebean.getPageSize());
             List<Info> infolist = query.list();
             pagebean.setList(infolist);

         } catch (Exception e) {
             e.printStackTrace();
         }
         return pagebean;
     }

 /*    public static void main(String[] args) {
         InfoMationDao im=new InfoMationDaoImpl();
         int pageno=1;
         String where="";
         PageBean<Info> pb = im.getInfoByPage(pageno, where);
         System.out.println(pb.getList().size());
     }*/
 }

so easy!