java分页类Page

package com.h3c.itac.util;import java.util.ArrayList;
import java.util.List;@SuppressWarnings("rawtypes")
public class Page {private int currentPageNum = 1;// 当前第几页(默认第一页),---主要用于传递到前台显示private int totalPageNum;// 总页数private int totalCount;// 总记录数private int perPageSize = 5;// 每页显示的记录条数(默认5条)private List entitys = new ArrayList();// 记录当前页中的数据条目// 所有参数都进行修改public Page(int currentPageNum, int totalCount, int perPageSize,List entitys) {this.totalCount = totalCount;this.perPageSize = perPageSize;this.totalPageNum = totalCount % perPageSize == 0 ? totalCount/ perPageSize : totalCount / perPageSize + 1;this.entitys = entitys;this.currentPageNum = currentPageNum<1?1:(currentPageNum>totalPageNum?totalPageNum:currentPageNum);//如果当前页小于第一页，则停留在第一页}// 使用默认的当前页和每页显示记录条数public Page( int totalCount, List entitys) {this.totalCount = totalCount;this.totalPageNum = totalCount % perPageSize == 0 ? totalCount/ perPageSize : totalCount / perPageSize + 1;this.entitys = entitys;this.currentPageNum = currentPageNum<1?1:(currentPageNum>totalPageNum?totalPageNum:currentPageNum);//如果当前页小于第一页，则停留在第一页}public int getCurrentPageNum() {return currentPageNum;}public void setCurrentPageNum(int currentPageNum) {this.currentPageNum = currentPageNum<1?1:(currentPageNum>totalPageNum?totalPageNum:currentPageNum);//如果当前页小于第一页，则停留在第一页}public int getTotalPageNum() {return totalPageNum;}public void setTotalPageNum(int totalPageNum) {this.totalPageNum = totalCount % perPageSize == 0 ? totalCount/ perPageSize : totalCount / perPageSize + 1;}public int getTotalCount() {return totalCount;}public void setTotalCount(int totalCount) {this.totalCount = totalCount;}public int getPerPageSize() {return perPageSize;}public void setPerPageSize(int perPageSize) {this.perPageSize = perPageSize;}public List getEntitys() {return entitys;}public void setEntitys(List entitys) {this.entitys = entitys;}@Overridepublic String toString() {return "PageUtil [currentPageNum=" + currentPageNum + ", totalPageNum="+ totalPageNum + ", totalCount=" + totalCount+ ", perPageSize=" + perPageSize + ", entitys=" + entitys + "]";}}

spring4+hibernate4分页查询：

//分页查询，从offset开始，向下查找length条数据，但是不包括offset的数据@SuppressWarnings({ "unchecked", "rawtypes" })public List<User> getUserPagingData(int currentPageNum,final int perPageNum){final String hql ="from User u";final int offset = (currentPageNum-1)*perPageNum;List<User> users = this.getHibernateTemplate().execute(new HibernateCallback() {@Overridepublic Object doInHibernate(Session session)throws HibernateException {Query query = session.createQuery(hql);query.setFirstResult(offset);query.setMaxResults(perPageNum);List<User> us = query.list();return us;}});return users;}

spring3的方法好像是executeFind

spring4+hibernate4查询数据库中所有记录：

public int getUserTotalCount(){int count= ((Long)this.getHibernateTemplate().find("select count(userId) from User u").iterator().next()).intValue();return count;
}

hibernate中查询数据库中所有记录：

String hql = "select count(*)  from Student ";
Query query = session.createQuery(hql);
int count = ((Long) query.iterate().next()).intValue();

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