数据库分页技术
2016-04-15 14:52
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news.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<%@ page import="com.util.Page"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>新闻</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">
-->
<link type="text/css" rel="stylesheet" href="css/style.css" />
<script type="text/javascript" src="js/lhgcore.js"></script>
<script type="text/javascript" src="js/lhgcalendar.js"></script>
<link type="text/css" href="js/lhgcalendar.css" rel="stylesheet" />
</head>
<body>
<div id="top"></div>
<div
style="border: 1px solid #A60000; width:98%; float:left; margin: 5px 1%;"></div>
<div id="wrap">
<!--导航条开始-->
<div class="nav_demo">
<ul>
<a href="index.jsp"><li><font>首页</font></li></a>
<a href="news.jsp"><li><font>新闻</font></li></a>
<a href="communication.jsp"><li><font>交流合作</font></li></a>
<a href="pavilion.jsp"><li><font>展馆介绍</font></li></a>
<a href="forum.jsp"><li><font>论坛</font></li></a>
<a href="organization.jsp"><li><font>机构介绍</font></li></a>
</ul>
</div>
<!--导航条结束-->
<div class="mainbody">
<!--标题部分-->
<div class="bt">
<div class="bt1">
<font>新闻资讯</font>
</div>
<div class="bt2">
<div class="ar_m1" id="ar_m1">
<a href="index.jsp">中国发票博物馆</a>
</div>
<div class="ar_r1" id="ar_r1"></div>
<div class="ljr">
<div class="ar_l"></div>
<div class="ar_m2">
<span class="font1">新闻资讯</span>
</div>
<div class="ar_r2"></div>
</div>
</div>
</div>
<%
ArrayList list = (ArrayList) request.getAttribute("list");
//拿到当前页
String pageStr = request.getParameter("page");
int currentPage = 1;
if (pageStr != null)
currentPage = Integer.parseInt(pageStr);
//每页显示3条，共list.size()条数据，传进当前页面
Page pUtil = new Page(3, list.size(), currentPage);
//得到当前页
currentPage = pUtil.getCurrentPage();
if (list != null && list.size() != 0) {
for (int i = pUtil.getFromIndex(); i < pUtil.getToIndex(); i++) {
ArrayList al = (ArrayList) list.get(i);
%>
<form action="" method="get" id="forml" name="forml">
<div
style="border:1px solid #3cf; width:98%; float:left; margin-left:1%;"></div>
<!--新闻总览部分-->
<div class="newsarea">
<img class="newsimg" src="<%=al.get(5)%>" />
<div class="newsmain">
<div class="newstitle">
<a href="#" class="newstitlefont"><%=al.get(0)%></a>
</div>
<div class="newsdetail">
<%=al.get(6)%>…<a href="xwchakan.action?<%=al.get(4) %>>" class="detail">【详细】</a>
</div>
</div>
</div>
<%
}
}
%>
</form>
<!--总览部分结束-->
<div class="pages">
<font>
<tr>
<td width=100% bgcolor="#eeeeee" colspan=4 align="center">
记录总数:<%=pUtil.getRecordCount()%>条
当前页/总页数:<%=currentPage%> /<%=pUtil.getPageCount()%>
<!-- 每页显示:<%=pUtil.getPageSize()%>条-->
<a href="paihang.action?page=1">首页</a>
<a href="paihang.action?page=<%=(currentPage - 1)%>">上页</a>
<a href="paihang.action?page=<%=(currentPage + 1)%>">下页</a>
<a href="paihang.action?page=<%=pUtil.getPageCount()%>">末页</a>
</td>
</tr>
</font>
</div>
<!--预约开始-->
<!--预约结束-->
</div>
</div>
<!--底部footer开始-->
<div class="footer">
<font>河北经贸大学 发票博物馆</font> <font>版权所有-河北经贸大学移动电子商务实验室</font>
</div>
<!--底部footer结束-->
</body>
</html>
Page.java
package com.util;
public class Page {
private int pageSize;// 每页显示的条数
private int recordCount;// 总共的条数
private int currentPage;// 当前页面
public Page(int pageSize, int recordCount, int currentPage) {
this.pageSize = pageSize;
this.recordCount = recordCount;
setCurrentPage(currentPage);
}
// 构造方法
public Page(int pageSize, int recordCount) {
this(pageSize, recordCount, 1);
}
// 总页数
public int getPageCount() {
int size = recordCount / pageSize;// 总条数/每页显示的条数=总页数
int mod = recordCount % pageSize;// 最后一页的条数
if (mod != 0)
size++;
return recordCount == 0 ? 1 : size;
}
// 包含，起始索引为0
public int getFromIndex() {
// System.out.println("from index:"+(currentPage-1) * pageSize);
return (currentPage - 1) * pageSize;
}
// 不包含
public int getToIndex() {
// System.out.println("to index:"+Math.min(recordCount, currentPage *
// pageSize));
return Math.min(recordCount, currentPage * pageSize);
}
// 得到当前页
public int getCurrentPage() {
return currentPage;
}// 设置当前页
public void setCurrentPage(int currentPage) {
int validPage = currentPage <= 0 ? 1 : currentPage;
validPage = validPage > getPageCount() ? getPageCount() : validPage;
this.currentPage = validPage;
}// 得到每页显示的条数
public int getPageSize() {
return pageSize;
}// 设置每页显示的条数
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}// 得到总共的条数
public int getRecordCount() {
return recordCount;
}// 设置总共的条数
public void setRecordCount(int recordCount) {
this.recordCount = recordCount;
}
}
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<%@ page import="com.util.Page"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>新闻</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">
-->
<link type="text/css" rel="stylesheet" href="css/style.css" />
<script type="text/javascript" src="js/lhgcore.js"></script>
<script type="text/javascript" src="js/lhgcalendar.js"></script>
<link type="text/css" href="js/lhgcalendar.css" rel="stylesheet" />
</head>
<body>
<div id="top"></div>
<div
style="border: 1px solid #A60000; width:98%; float:left; margin: 5px 1%;"></div>
<div id="wrap">
<!--导航条开始-->
<div class="nav_demo">
<ul>
<a href="index.jsp"><li><font>首页</font></li></a>
<a href="news.jsp"><li><font>新闻</font></li></a>
<a href="communication.jsp"><li><font>交流合作</font></li></a>
<a href="pavilion.jsp"><li><font>展馆介绍</font></li></a>
<a href="forum.jsp"><li><font>论坛</font></li></a>
<a href="organization.jsp"><li><font>机构介绍</font></li></a>
</ul>
</div>
<!--导航条结束-->
<div class="mainbody">
<!--标题部分-->
<div class="bt">
<div class="bt1">
<font>新闻资讯</font>
</div>
<div class="bt2">
<div class="ar_m1" id="ar_m1">
<a href="index.jsp">中国发票博物馆</a>
</div>
<div class="ar_r1" id="ar_r1"></div>
<div class="ljr">
<div class="ar_l"></div>
<div class="ar_m2">
<span class="font1">新闻资讯</span>
</div>
<div class="ar_r2"></div>
</div>
</div>
</div>
<%
ArrayList list = (ArrayList) request.getAttribute("list");
//拿到当前页
String pageStr = request.getParameter("page");
int currentPage = 1;
if (pageStr != null)
currentPage = Integer.parseInt(pageStr);
//每页显示3条，共list.size()条数据，传进当前页面
Page pUtil = new Page(3, list.size(), currentPage);
//得到当前页
currentPage = pUtil.getCurrentPage();
if (list != null && list.size() != 0) {
for (int i = pUtil.getFromIndex(); i < pUtil.getToIndex(); i++) {
ArrayList al = (ArrayList) list.get(i);
%>
<form action="" method="get" id="forml" name="forml">
<div
style="border:1px solid #3cf; width:98%; float:left; margin-left:1%;"></div>
<!--新闻总览部分-->
<div class="newsarea">
<img class="newsimg" src="<%=al.get(5)%>" />
<div class="newsmain">
<div class="newstitle">
<a href="#" class="newstitlefont"><%=al.get(0)%></a>
</div>
<div class="newsdetail">
<%=al.get(6)%>…<a href="xwchakan.action?<%=al.get(4) %>>" class="detail">【详细】</a>
</div>
</div>
</div>
<%
}
}
%>
</form>
<!--总览部分结束-->
<div class="pages">
<font>
<tr>
<td width=100% bgcolor="#eeeeee" colspan=4 align="center">
记录总数:<%=pUtil.getRecordCount()%>条
当前页/总页数:<%=currentPage%> /<%=pUtil.getPageCount()%>
<!-- 每页显示:<%=pUtil.getPageSize()%>条-->
<a href="paihang.action?page=1">首页</a>
<a href="paihang.action?page=<%=(currentPage - 1)%>">上页</a>
<a href="paihang.action?page=<%=(currentPage + 1)%>">下页</a>
<a href="paihang.action?page=<%=pUtil.getPageCount()%>">末页</a>
</td>
</tr>
</font>
</div>
<!--预约开始-->
<!--预约结束-->
</div>
</div>
<!--底部footer开始-->
<div class="footer">
<font>河北经贸大学 发票博物馆</font> <font>版权所有-河北经贸大学移动电子商务实验室</font>
</div>
<!--底部footer结束-->
</body>
</html>
Page.java
package com.util;
public class Page {
private int pageSize;// 每页显示的条数
private int recordCount;// 总共的条数
private int currentPage;// 当前页面
public Page(int pageSize, int recordCount, int currentPage) {
this.pageSize = pageSize;
this.recordCount = recordCount;
setCurrentPage(currentPage);
}
// 构造方法
public Page(int pageSize, int recordCount) {
this(pageSize, recordCount, 1);
}
// 总页数
public int getPageCount() {
int size = recordCount / pageSize;// 总条数/每页显示的条数=总页数
int mod = recordCount % pageSize;// 最后一页的条数
if (mod != 0)
size++;
return recordCount == 0 ? 1 : size;
}
// 包含，起始索引为0
public int getFromIndex() {
// System.out.println("from index:"+(currentPage-1) * pageSize);
return (currentPage - 1) * pageSize;
}
// 不包含
public int getToIndex() {
// System.out.println("to index:"+Math.min(recordCount, currentPage *
// pageSize));
return Math.min(recordCount, currentPage * pageSize);
}
// 得到当前页
public int getCurrentPage() {
return currentPage;
}// 设置当前页
public void setCurrentPage(int currentPage) {
int validPage = currentPage <= 0 ? 1 : currentPage;
validPage = validPage > getPageCount() ? getPageCount() : validPage;
this.currentPage = validPage;
}// 得到每页显示的条数
public int getPageSize() {
return pageSize;
}// 设置每页显示的条数
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}// 得到总共的条数
public int getRecordCount() {
return recordCount;
}// 设置总共的条数
public void setRecordCount(int recordCount) {
this.recordCount = recordCount;
}
}
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