IDC资讯中心
//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((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＞
