一个分页的类及调用的例子
导读：收集整理的这篇文章主要介绍了一个分页的类及调用的例子，觉得挺不错的，现在分享给大家，也给大家做个参考。 //PageCt.ja...
收集整理的这篇文章主要介绍了一个分页的类及调用的例子，觉得挺不错的，现在分享给大家，也给大家做个参考。 //PageCt.java 分页的类
/*
*** @version ***********
*** Created on 2001年6月25日, 下午14:41
**************************************
*/
package vod;
import java.SQL.*;
import java.util.*;
public class PageCt
{
PRivate long l_start; //开始纪录
private long l_end; //结束纪录
private long l_curpage; //当前页数
private long l_totalnum; //总记录数
private int int_num=5; //每页10条
private long l_totalpage; //总的页数
public void InIT(long currentpage,long totalnum)
{
l_curpage = currentpage;
l_totalnum = totalnum;
if (currentpage> =0)
{
if (currentpage> =(long)Math.ceil((double)l_totalnum/(double)int_num))
l_curpage = (long)Math.floor((double)l_totalnum/(double)int_num);
else
l_curpage = currentpage;
}
else
{
l_curpage = 0;
}
l_start = l_curpage * int_num;
l_end = l_start + int_num;
if (l_end > l_totalnum)
l_end = l_totalnum;
l_totalpage = (long)Math.ceil((double)l_totalnum/(double)int_num);
}
public long getCurpage()
{
return l_curpage;
}
public long getPrepage()
{
if (l_curpage-1> =0)
{
return l_curpage-1;
}
else
{
return 0;
}
}
public long getNextpage()
{
if (l_curpage+1=l_totalpage)
{
return l_curpage+1;
}
else
{
return l_totalpage;
}
}
public long getTotalnum()
{
return l_totalnum;
}
public long getTotalpage()
{
return l_totalpage;
}
public long getStart()
{
return l_start;
}
public long getEnd()
{
return l_end;
}
} ;
===============================================
//调用例子
%
/*
*** @author 马毅 ***********
*** @version ***********
*** Created on 2001年6月12日, 下午17:13
**************************************
*/
%@ page import="java.sql.*"%>
%@ page import="java.lang.*"%>
%@ page contentTyPE="text/htML; charset=gb2312" %>
jsp:useBean id="PageCount" scope="page" class="kstest.PageCt" />
jsp:useBean id="sqlbean" scope="page" class="vod.sql_data" />
html>
head>
TITLE> 测试/TITLE>
STYLE>
body,table{ font-Size:9pt}
A:link {
COLOR: #000084; TEXT-DECORATION: none
}
A:visited {
COLOR: #000084; TEXT-DECORATION: none
}
A:hover {
COLOR: black; TEXT-DECORATION: underline
}
.ourfont {
FONT-sIZE: 9pt
}
/STYLE>
/head>
body bgcolor=#eff3ff>
center>
font color=#000084> h3> Test for Test/h3> /font>
hr width=600 color=#b5dbff>
br>
%
ResultSet rs0 = sqlbean.executeQuery("select count(*) From UserList );
rs0.next();
long data_num=rs0.getLong(1);
long Current_Page = 0;
String currentpage=(String)request.getParameter("currentpage");
if (currentpage != null & & !currentpage.equals(""))
{
Current_Page = Integer.parseInt(request.getParameter("currentpage"));
}
String Query_Page=(String)request.getParameter("Query_Page");
if (Query_Page!=null & & !Query_Page.equals(""))
{
Current_Page = Integer.parseInt(request.getParameter("Query_Page"))-1;
}
PageCt.Init(Current_Page,data_num);
long l_start = PageCt.getStart();
long l_end = PageCt.getEnd();
//查询记录
ResultSet rs = sqlbean.executeQuery("select * from UserList " );
long i=0;
while((il_start) & & rs.next())
{
i++;
}
//输出查询结果
long j=0;
while(rs.next() & & (il_end))
{
j=i+1;
String col2 = rs.getString(2);
String col3 = rs.getString(3);
String col4 = rs.getString(4);
String col5 = rs.getString(5);
String col6 = rs.getString(6);
String col7 = rs.getString(7);
String col8 = rs.getString(8);
//打印所显示的数据
out.println("table border=0 width=600> ");
out.println("tr> td colspan=2> font color=#000084> " + j + "、"+(col2==null?"":col2)+"/font> /td> /tr> tr> td colspan=2> 答案："+(col3==null?"":col3)+"/td> /tr> ");
out.println("tr> td> & nbsp; & nbsp; 选项1："+(col4==null?"":col4)+"/td> td> & nbsp; & nbsp; 选项2："+(col5==null?"":col5)+"/td> /tr> ");
out.println("tr> td> & nbsp; & nbsp; 选项3："+(col6==null?"":col6)+"/td> td> & nbsp; & nbsp; 选项4："+(col7==null?"":col7)+"/td> /tr> ");
if (col8!=null & & !col8.equals(""))
{
out.println("tr> td colspan=2> 备注："+col8+"/td> /tr> ");
}
out.println("/table> br> ");
i++;
}
%>
table width=600>
tr bgcolor=#b5dbff>
form method=GET action=index.jsp>
td width=80 align=center valign=bottom> 共 %=PageCt.getTotalnum()%> 条/td>
td width=80 align=center valign=bottom> %=PageCt.getCurpage()+1%> /%=PageCt.getTotalpage()%> 页/td>
td width=120 align=center> 查看第 input type=text name=Query_Page size=3> 页/td>
td width=50 align=center valign=bottom> a href=index.jsp?currentpage=%=PageCt.getPrepage()%> > 上页/a> /td>
td width=50 align=center valign=bottom> a href=index.jsp?currentpage=%=PageCt.getNextpage()%> > 下页/a>
/td>
/tr>
/table>
br> br> br>
table cellspacing=20>
tr>
td> 问题包含input type=text name=question_str size=10 value=% if (question_str != null) out.println(question_str); %> > /td>
td> 答案包含input type=text name=answer_str size=10 value=% if (answer_str != null) out.println(answer_str); %> > /td>
td> 选项包含input type=text name=sel_str size=10 value=% if (sel != null) out.println(sel); %> > /td>
/tr>
tr>
td colspan=3 align=center> input type=submit value=查询> /td>
/tr>
/form>
/table>
br> br>
a href="insert.jsp"> 添加/a>
center>
/body>
/html>
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