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//PageCt.java 分页的类

/*

*** @version ***********

**************************************

*/

package vod;

import java.sql.*;

import java.util.*;

public class PageCt

{

private long l_start; //开始32313133353236313431303231363533e4b893e5b19e31333332643232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 孤独的风筝 ***********

*** @version ***********

*** Created on :2010-08-16 14:56 **************************************

*/

＜%@ 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((i＜l_start) && rs.next())

{

i++;

}

//输出查询结果

long j=0;

while(rs.next() && (i＜l_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＞ 选项1："+(col4==null?"":col4)+"＜/td＞＜td＞ 选项2："+(col5==null?"":col5)+"＜/td＞＜/tr＞");

out.println("＜tr＞＜td＞ 选项3："+(col6==null?"":col6)+"＜/td＞＜td＞ 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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