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一个分页的类及调用的例子

//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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一个分页的类及调用的例子

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