[置顶] JSP分页,使用Hibernate+mysql

此代码为博主参考巴巴运动网源码所得，大部分一样，略有修改，在这里分享给大家，也方便自己以后写代码直接copy,看网上很多分页代码JSP里是用JAVA代码，博主原来也是这样，看到源码了解了JSTL，建议使用JSTL代码更清晰直观。

PageView.java
public class PageView<T> {
	/** 分页数据 **/
	private List<T> records;
	/** 页码开始索引和结束索引 **/
	private PageIndex pageindex;
	/** 总页数 **/
	private long totalpage = 1;
	/** 每页显示记录数 **/
	private int maxresult = 10;
	/** 当前页 **/
	private int currentpage = 1;
	/** 总记录数 **/
	private long totalrecord;
	/** 页码数量 **/
	private int pagecode = 7;
	/** 要获取记录的开始索引 **/
	public int getFirstResult() {
		return (this.currentpage-1)*this.maxresult;
	}
	public int getPagecode() {
		return pagecode;
	}

	public void setPagecode(int pagecode) {
		this.pagecode = pagecode;
	}
	
	public void setQueryResult(List<T> qr){
		setRecords(qr);
	}
	
	public long getTotalrecord() {
		return totalrecord;
	}
	public void setTotalrecord(long totalrecord) {
		this.totalrecord = totalrecord;
		setTotalpage(this.totalrecord%this.maxresult==0? this.totalrecord/this.maxresult : this.totalrecord/this.maxresult+1);
	}
	public List<T> getRecords() {
		return records;
	}
	public void setRecords(List<T> records) {
		this.records = records;
	}
	public PageIndex getPageindex() {
		return pageindex;
	}
	public long getTotalpage() {
		return totalpage;
	}
	public void setTotalpage(long totalpage) {
		this.totalpage = totalpage;
		this.pageindex = PageIndex.getPageIndex(pagecode, currentpage, totalpage);
	}
	public int getMaxresult() {
		return maxresult;
	}
	public int getCurrentpage() {
		return currentpage;
	}
	public void setMaxresult(int maxresult) {
		this.maxresult = maxresult;
	}
	public void setCurrentpage(int currentpage) {
		this.currentpage = currentpage;
	}
}

PageIndex.java
public class PageIndex {
	private long startindex;
	private long endindex;
	
	public PageIndex(long startindex, long endindex) {
		this.startindex = startindex;
		this.endindex = endindex;
	}
	public long getStartindex() {
		return startindex;
	}
	public void setStartindex(long startindex) {
		this.startindex = startindex;
	}
	public long getEndindex() {
		return endindex;
	}
	public void setEndindex(long endindex) {
		this.endindex = endindex;
	}
	 
	public static PageIndex getPageIndex(long viewpagecount, int currentPage, long totalpage){
			long startpage = currentPage-(viewpagecount%2==0? viewpagecount/2-1 : viewpagecount/2);
			long endpage = currentPage+viewpagecount/2;
			if(startpage<1){
				startpage = 1;
				if(totalpage>=viewpagecount) endpage = viewpagecount;
				else endpage = totalpage;
			}
			if(endpage>totalpage){
				endpage = totalpage;
				if((endpage-viewpagecount)>0) startpage = endpage-viewpagecount+1;
				else startpage = 1;
			}
			return new PageIndex(startpage, endpage);		
	}
}

PageDaoSupport.java //这个为参考李刚轻量级JAVA EE那本书
public class PageDaoSupport extends HibernateDaoSupport{
		public List findByPage(final String hql, final int offset,
			final int pageSize) {
		// 通过一个HibernateCallback对象来执行查询
		List list = getHibernateTemplate().executeFind(new HibernateCallback() {
			// 实现HibernateCallback接口必须实现的方法
			public Object doInHibernate(Session session)
					throws HibernateException, SQLException {
				// 执行Hibernate分页查询
				List result = session.createQuery(hql).setFirstResult(offset)
						.setMaxResults(pageSize).list();
				return result;
			}
		});
		return list;
	     }
	}

PagingServiceImpl.java
public class PagingServiceImpl implements PagingService {
	private PageDaoSupport pageDaoSupport;
	private PageView<ProductInfo> pageView;
	private ProductInfoDao productInfoDao;//用来获得表中要显示的记录

	public ProductInfoDao getProductInfoDao() {
		return productInfoDao;
	}

	public void setProductInfoDao(ProductInfoDao productInfoDao) {
		this.productInfoDao = productInfoDao;
	}

	public PageDaoSupport getPageDaoSupport() {
		return pageDaoSupport;
	}

	public void setPageDaoSupport(PageDaoSupport pageDaoSupport) {
		this.pageDaoSupport = pageDaoSupport;
	}

	public PageView<ProductInfo> getPageView() {
		return pageView;
	}

	public void setPageView(PageView<ProductInfo> pageView) {
		this.pageView = pageView;
	}
	/**
	 * 首次请求时执行此方法
	 */
	public PageView<ProductInfo> paging() {
		pageView.setCurrentpage(1);
		pageView.setTotalrecord(productInfoDao.getTotalCount());
		pageView.setQueryResult(pageDaoSupport.findByPage("from ProductInfo",
				0, pageView.getMaxresult()));
		return pageView;
	}
	/**
	 * 每次更换页码调用此方法
	 */
	public PageView<ProductInfo> requestPage(String requestPage) {
		pageView.setCurrentpage(Integer.parseInt(requestPage));
		pageView.setTotalrecord(productInfoDao.getTotalCount());
		pageView.setQueryResult(pageDaoSupport.findByPage("from ProductInfo",
				pageView.getFirstResult(), pageView.getMaxresult()));
		return pageView;
	}
}

代码差不多就这些了，解析下PageView.java

每页显示记录数maxresult，显示在页面的页码数pagecode，是写死的，我们设置下总记录数即可得到总页数，设置下当前页码，可得到pageindex页码开始索引和结束索引（根据总页数，当前页码，显示页码数），好了，只剩下最后一个变量了，即records我们要查找的记录集合，我在这里是每请求一页然后查询出当页的记录。至此，所有工作已完毕，显示到页面就可以了

显示页码的JSP

				<div class="pagination">

					<c:if test="${pageView.getCurrentpage()!=1}">
						<a	href="AdminShowProductAction!requestPage.action?pageNum=${pageView.getCurrentpage()-1}"
							class="prev">«</a>
					</c:if>

					<c:forEach begin="${pageView.getPageindex().getStartindex()}"
						end="${pageView.getPageindex().getEndindex()}" var="x">
						<a href="AdminShowProductAction!requestPage.action?pageNum=${x}" 
							<c:if test="${pageView.getCurrentpage()==x}">class="current"</c:if>>${x}
						</a>
					</c:forEach>
					
					<c:if test="${pageView.getCurrentpage()!= pageView.getTotalpage()}">
						<a	href="AdminShowProductAction!requestPage.action?pageNum=${pageView.getCurrentpage()+ 1}"
							class="next">»</a>
					</c:if>
				</div>