最简单的一个分页思路

这个分页思路适合于web中的各种分页需要，不过只是最基本的

package com.netshop.tag;

import java.sql.ResultSet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.netshop.data.*;

public class shownews extends TagSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
public int i=0;
@Override
public int doEndTag() throws JspException {
// TODO Auto-generated method stub
JspWriter out=pageContext.getOut();
HttpServletRequest request=(HttpServletRequest)pageContext.getRequest();
DataStore ds=DataStore.getInstance();
ResultSet rs=null;
String sql_count="select count(*) from news";
String sql="select * from news";
String tmp=null;
int count=0;//记录总数
int page=0; //当前要显示的页数
int total_page=0;//页面总数
try{
count=ds.readCount(sql_count);
}
catch(Exception ex)
{
count=0;
}
total_page=count/6;//计算总页面
try
{
rs=ds.read(sql); //读取所有的记录集
}
catch(Exception e)
{
rs=null;
}
try
{
tmp=(String)request.getParameter("page");//从request中读取page参数
if(tmp==null)
page=0;
else
page=Integer.parseInt(tmp);
}
catch(Exception ex1)
{
page=0;
}

//输出记录
try
{
out.print("<table width=600 height=30 border=1 cellpadding=0 bordercolor=#0066FF>");
out.print("<tr align=center><td height=30>编号</td><td height=30>标题</td><td height=30>删除</td></tr>");
//重点
for(i=0;i<page*6;i++)
{
rs.next();
}
i=page*6;
int j=0;
while((rs!=null)&&(rs.next())&&(j<6))
{
String newsid=rs.getString(1);
String newstitle=rs.getString(2);
newstitle=new String(newstitle.getBytes("ISO-8859-1"),"UTF-8");
out.print("<tr align=center><td height=30>"+newsid+"</td>");
out.print("<td height=30>"+newstitle+"</td>");
out.print("<td height=30><a href=deletenews.jsp?id="+newsid+">删除</a></td></tr>");
j++;
}
if(page>0)
{
out.print("<tr align=center><td height=30 colspan=3><a href=news_edit.jsp?page=0>首页</a>");
out.print("<a href=news_edit.jsp?page="+(page-1)+">上一页</a>");
}
else
{
out.print("<tr align=center><td height=30 colspan=3>首页");
out.print("上一页");
}
if(page<total_page)
{
out.print("<a href=news_edit.jsp?page="+(page+1)+">下一页</a>");
out.print("<a href=news_edit.jsp?page="+total_page+">末页</a></td></tr>");
}
else
{
out.print("下一页");
out.print("末页</td></tr>");
}
out.print("</table>");
}
catch(Exception e)
{

}
return super.doEndTag();
}
}