【转】一个用JSP实现的分页的类及调用方法
代码
//PageCt.Java 分页的类
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
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;
return l_curpage;
}
public long getPrepage()
{
if (l_curpage-1＞=0)
return l_curpage-1;
else
return 0;
}
{
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;
}
{
if (l_curpage+1＜=l_totalpage)
return l_curpage+1;
else
return l_totalpage;
}
public long getTotalnum()
{
return l_totalnum;
}
{
return l_totalnum;
}
public long getTotalpage()
{
return l_totalpage;
}
{
return l_totalpage;
}
public long getStart()
{
return l_start;
}
{
return l_start;
}
public long getEnd()
{
return l_end;
}
};
{
return l_end;
}
};
代码
//调用例子
＜%@ 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＞＜/head＞
<body>
＜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＞
＜/body＞
＜/html＞
