引用 javaBean的问题,高手看看,帮忙!

Question

JAVABEAN源代码
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;
    }}

Answer 1

HTML中调用代码:
<%@ page import="vod.PageCt"%>
<jsp:useBean id="PageCount" scope="page" class="vod.PageCt" />
-----------------
这部分执行数据库操作
------------------
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--------------------
JAVABEAN的引用
-------------------=
long data_num=rs1_1.getRow();
           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();

Answer 2

int l_start = PageCt.getStart();类型不匹配，你的Bean中返回的是long但是，你却声明了int类型。

Answer 3

long l_start = PageCt.getStart();