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hibernate分页的实现

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导读：本篇文章讲解 hibernate分页的实现，希望对大家有帮助，欢迎收藏，转发！站点地址：www.bmabk.com

系统采用springMVC+hibernate架构，本文是基于网络上的一个paginationsupport类经过修改而成，下面直接贴代码：

1.PaginationSupport类(封装页面数据)

package com.darren.demo3l.commonUtils;

import java.util.List;

public class PaginationSupport {
	 public final static int PAGESIZE = 5;
//设置每页显示记录的多少
	 private int pageSize = PAGESIZE;
//总记录条数 
	 private int totalCount;
//当前页
	 private int currentPage;
//当前页起始记录索引
	 private int startIndex;
//保存每一页的第一条记录的索引
	 private int[] indexes = new int[0];
//下一页第一条记录索引	 
	 private int nextIndex;
//上一页第一条记录索引	 
	 private int previousIndex;
//总页数 
	 private int pageCount;
//返回查询结果
	 private List items;
//最后一页第一条记录的索引	 
	 private int lastIndex;
	 
	 public  PaginationSupport(int pageSize,int startIndex) {
	  setPageSize(pageSize);
	  setStartIndex(startIndex);
	  
	 }

	 public  PaginationSupport(List items, int totalCount) {
	  setPageSize(PAGESIZE);
	  setTotalCount(totalCount);
	  setItems(items);
	  setStartIndex(0);
	 
	 }

	 public  PaginationSupport(List items, int totalCount, int startIndex) {
	  setPageSize(PAGESIZE);
	  setTotalCount(totalCount);
	  setItems(items);
	  setStartIndex(startIndex);
	  
	 }

	 public  PaginationSupport(List items, int totalCount, int pageSize,
	   int startIndex) {
	  setPageSize(pageSize);
	  setTotalCount(totalCount);
	  setItems(items);
	  setStartIndex(startIndex);
	  
	 }

//设置总记录数
	 public void setTotalCount(int totalCount) {
	  if (totalCount > 0) {
	   this.totalCount = totalCount;
	   int count = totalCount / pageSize;
	   if (totalCount % pageSize > 0){
	    count++;//count计算的是总页数	
	   }
	   indexes = new int[count];
	   for (int i = 0; i < count; i++) {
	    indexes[i] = pageSize * i;//indexes[i]存取了每i+1页的第一条记录的索引
	   }
	    }
	  else {
	   this.totalCount = 0;
	  }
	 }
	 
	//获取记录总数	
	 public int getTotalCount() {
	  return totalCount;
	 }
	 //设置每一页第一条记录的索引
	 public void setIndexes(int[] indexes) {
	  this.indexes = indexes;
	 }
	//返回每一页第一条记录的索引
	 public int[] getIndexes() {
	  return indexes;
	 }
	 
     //设置起始记录索引
	 public void setStartIndex(int startIndex) {
	  if (totalCount <= 0)
	   this.startIndex = 0;
	  else if (startIndex >= totalCount)
	   this.startIndex = indexes[indexes.length - 1];
	  else if (startIndex < 0)
	   this.startIndex = 0;
	  else {
		  //设置为该记录所在页的收条记录的索引
	   this.startIndex = indexes[startIndex / pageSize];
	  }
	   }
	 //获取起始记录索引
	 public int getStartIndex() {
	  return startIndex;
	 }

	 //设置下一页索引
	 public void setNextIndex(int nextIndex) {
	  this.nextIndex = nextIndex;
	 }
	 
	 //获取下一页首条记录的索引
	 public int getNextIndex() {
	  int nextIndex = getStartIndex() + pageSize;
	  if (nextIndex >= totalCount)
	   return getStartIndex();
	  else
	   return nextIndex;
	 }
	 
	// 设置上一页的起始记录索引
	 public void setPreviousIndex(int previousIndex) {
	  this.previousIndex = previousIndex;
	 }
    // 获取上一页的起始记录索引
	 public int getPreviousIndex() {
	  int previousIndex = getStartIndex() - pageSize;
	  if (previousIndex < 0)
	   return 0;
	  else
	   return previousIndex;
	 }
    // 获取上一页的起始记录索引
	 public void setPageCount(int pageCount) {
	  this.pageCount = pageCount;
	 }
    //获取总页数 
	 public int getPageCount() {
	  int count = totalCount / pageSize;
	  if (totalCount % pageSize > 0)
	   count++;
	  return count;
	 }
	 //获取当前页
	 public int getCurrentPage() {
	  return getStartIndex() / pageSize + 1;
	 }
	 
	 //设置当前页
	 public void setCurrentPage(int currentPage) {
	  this.currentPage = currentPage;
	 }
	 //设置最后一页的首条记录的索引
	 public void setLastIndex(int lastIndex) {
	  this.lastIndex =lastIndex ;
	 }
	 //获取最后一页的首条记录的索引
	 public int getLastIndex() {
	  return indexes[indexes.length-1];
	 }
	 //获取当前页的每页条数
	 public int getPageSize() {
	  return pageSize;
	 }
	//设置每页条数
	 public void setPageSize(int pageSize) {
	  this.pageSize = pageSize;
	 }
	//获取返回记录
	 public List getItems() {
	  return items;
	 }
    //设置返回记录
	 public void setItems(List items) {
	  this.items = items;
	 }
}

2.dao层查询分页数据的方法

@SuppressWarnings("unchecked")
public PaginationSupport findPageByCriteria( final  String hsql,  final int pageSize,final int startIndex) {
	 System.out.println("进入查询");
	 PaginationSupport paginationSupport = null;
	 try {
		 paginationSupport=getHibernateTemplate().execute(new HibernateCallback(){
			 //调用hibernate的条件查询;
			@Override
			public Object doInHibernate(Session session)throws HibernateException, SQLException{
				Query query  =  session.createQuery(hsql);
	            int totalCount=query.list().size();
	            query.setFirstResult(startIndex); 
	            query.setMaxResults(pageSize); 
	            List items  = query.list();
	            PaginationSupport ps = new PaginationSupport(items,
	            totalCount, pageSize, startIndex);
	            return ps;
			}
			 
		 });
		
	} catch (Exception e) {
		e.printStackTrace();
	}
	 return paginationSupport;
}

3.分页查询的公共显示页面。 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<c:set var="ctx" value="${pageContext.request.contextPath }"/>
 <script type="text/javascript" src="${ctx}/resources/js/common/jquery-1.7.1.js"></script>
 <script type="text/javascript" src="${ctx}/resources/js/common/jquery.validate.js"></script>
 <script type="text/javascript">
 /**
 * @author IRun
 */
 //跳转到指定页面
  function topage(obj){
  window.location.href="${ctx}/user/getperson.do?page="+obj;
  }
  
  //跳转到任意页面
  function torandpage(){
  var page=$("#pageInput").val();
  if(page==""){
  return false;
  }
  
  else{
  var patrn=/^([1-9]\d*|0)(\.\d*[1-9])?$/; 
  if (!patrn.exec(page)) {
  alert("输入页码不合法");
  return false;
  }
  else{
  var pagecount=$("#pagecount").val();
  if(page>pagecount)
  page=pagecount;
  }
  if(page<=0){
  page=1;
  }
  window.location.href="${ctx}/user/getperson.do?page="+page;
  }
  
  }
 </script>
 <div>
 <input type="hidden" value="${ctx}"  id="context" />
<font >
    当前页:第${personlist.currentPage}页 | 总记录数:${personlist.totalCount}条 | 每页显示:${personlist.pageSize}条 | 总页数:${personlist.pageCount}页</font>　
 <c:choose>
<c:when test="${personlist.currentPage==1}"><b><font color="#ffff00">首页</font></b></c:when>
<c:otherwise><a href="javascript:topage('1')">首页</a></c:otherwise>
</c:choose>
<c:if test="${personlist.currentPage>=2}"><a href="javascript:topage('${personlist.currentPage-1}')">上一页</a></c:if>
<c:if test="${personlist.currentPage!=1&&personlist.currentPage!=personlist.pageCount}"><b><font color="#000000">第${personlist.currentPage}页</font></b></c:if>
<c:if test="${personlist.currentPage<personlist.pageCount}"><a href="javascript:topage('${personlist.currentPage+1}')">下一页</a></c:if>
<c:choose>
<c:when test="${personlist.currentPage<personlist.pageCount}"><a href="javascript:topage('${personlist.pageCount}')">末页</a></c:when>
<c:otherwise><b><font color="#FFFF">末页</font></b></c:otherwise>
</c:choose>
<span >跳转到：</span>
<input  type="text" id="pageInput" name="page" value="${personlist.currentPage}" size="4" />页
   <input  type="hidden" id="pagecount" name="pages" value="${personlist.pageCount}" size="4" />页 
	<a  id="goPageBnt" οnclick="return torandpage();" href='#'>确定</a>
</div>

4.数据具体显示页面。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<c:set var="ctx" value="${pageContext.request.contextPath }"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  <body>
 <div>
 <table>
 <caption><br>显示所有用户</caption>
 <tr>
 <td>用户id</td>
 <td>名称</td>
<td>性别</td>
<td>job编号</td>
</tr>
 <c:forEach var="persons" items="${personlist.items}">
 <tr><td>${persons.personid}</td>
<td>${persons.personname}</td>
<td>${persons.sex}</td>
<td>${persons.job.jobid}</td></tr>
 </c:forEach>
  </table>
 </div>
 <div>
<jsp:include page="/WEB-INF/pages/common/paging.jsp"></jsp:include>
</div>
  </body>
</html>

5.action 层的方法为接收page参数，然后调用service层的获取分页数据的方法，最后返回PaginationSupport对象，action太简单再次略过，最后贴一下service层调用dao层分页数据的方法:

public PaginationSupport findPage(int page){
	String hsql="from Person p";
	int  startIndex=PaginationSupport.PAGESIZE*(page-1);
	PaginationSupport paginationSupport;
	paginationSupport=persoDao.findPageByCriteria(hsql, PaginationSupport.PAGESIZE, startIndex);
	return paginationSupport;
}

 

本处贴的代码实现了基本的功能，代码很多不规范，页面也没美化，欢迎吐槽。

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