第一步：
先定义一个分页对象，也就是一个java bean
package com.wyf.common.web;
/**
* 分页类
* @author wgy
*
*/
public class Page {
/**
* 分页下标 即当前页 默认为第1页
*/
private int pageIndex = 1;
/**
* 分页总数 即总共分多少页 默认为1页
*/
private int pageCount = 1;
/**
* 分页大小 即每页显示记录条数 默认为5条
*/
private int pageSize = 5;
/**
* 总的记录条数 即一共有多少条数据
*/
private int dataCount;
/**
* 排序列字段名称
*/
private String orderByColumnName;
/**
* 排序方式 默认为 "ASC" 升序
*/
private String orderByWay = "ASC";
/**
* 排序方式常量 "DESC" 降序
*/
public static final String PAGE_ORDER_BY_DESC = "DESC";
/**
* 排序方式常量 "ASC" 升序
*/
public static final String PAGE_ORDER_BY_ASC = "ASC";
public int getPageIndex() {
return pageIndex;
}
public void setPageIndex(int pageIndex) {
this.pageIndex = pageIndex;
}
public int getPageCount() {
return pageCount;
}
public void setPageCount(int pageCount) {
this.pageCount = pageCount;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getDataCount() {
return dataCount;
}
public void setDataCount(int dataCount) {
this.dataCount = dataCount;
}
public String getOrderByColumnName() {
return orderByColumnName;
}
public void setOrderByColumnName(String orderByColumnName) {
this.orderByColumnName = orderByColumnName;
}
public String getOrderByWay() {
return orderByWay;
}
public void setOrderByWay(String orderByWay) {
this.orderByWay = orderByWay;
}
}第二步骤:
分页组件
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>分页页面</title>
<script type="text/javascript">
function goToIndex(index){
var myQueryForm = document.getElementById("queryForm");//读取数据的action
var pageIndex = $("#pageIndex");
var pageCountValue = $("#pageCount").val();
switch(index){
case 0:
if(pageIndex.val() == 1){
alert("当前已经是第一页。");
return;
}else{
pageIndex.val("1");
}
break;
case -1:
if(pageIndex.val() == 1){
alert("当前已经是第一页。");
return;
}else{
pageIndex.val(parseInt(pageIndex.val())-1);
}
break;
case 1:
if(pageIndex.val() == pageCountValue){
alert("当前已经是最后一页。");
return;
}else{
pageIndex.val(parseInt(pageIndex.val())+1);
}
break;
case 2:
if(pageIndex.val() == pageCountValue){
alert("当前已经是最后一页。");
return;
}else{
pageIndex.val(pageCountValue);
}
}
myQueryForm.submit();
}
</script>
</head>
<body>
<table align="center" width="100%">
<tr align="center">
<td width="30%">共 <s:property value="#request.pageBean.dataCount" /> 条数据</td>
<td width="50"> <a href="#" onclick="goToIndex(0);return false;">首页</a> </td>
<td width="80"> <a href="#" onclick="goToIndex(-1);return false;">上一页</a> </td>
<td width="80"> <a href="#" onclick="goToIndex(1);return false;">下一页</a> </td>
<td width="50"> <a href="#" onclick="goToIndex(2);return false;">尾页</a> </td>
<td width="30%">第 <s:property value="#request.pageBean.pageIndex" /> 页/共 <s:property value="#request.pageBean.pageCount" /> 页</td>
</tr>
</table>
</body>
</html>页面提交的时候传入2个隐藏域
<input type="hidden" id="pageIndex" name="pageBean.pageIndex" value="<s:property value="pageBean.pageIndex"/>"/> <input type="hidden" id="pageCount" name="pageBean.pageCount" value="<s:property value="pageBean.pageCount"/>"/>
后台分页算法：
public List<T> queryDataWithPageBeanAndHql(Page pageBean,String hql){
Session session = this.getSession();
Query queryPage = session.createQuery(hql);
List<T> list = null;
if(pageBean == null){
list = queryPage.list();
}else{
Query query = session.createQuery("select count(*) " + hql.substring(hql.indexOf("from")));
//总的记录条数
int count = ((Long)query.list().get(0)).intValue();
//保存总的记录条数到PageBean中
pageBean.setDataCount(count);
pageBean.setPageCount((count-1)/pageBean.getPageSize() + 1);
queryPage.setFirstResult((pageBean.getPageIndex()-1)*pageBean.getPageSize());
queryPage.setMaxResults(pageBean.getPageSize());
list=queryPage.list();
}
session.close();
return list;
}
