<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="com.core.ConnDB"%>
<%
<%
ConnDB conn=new ConnDB();
ResultSet rs=conn.executeQuery("select * from pic ");
%>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="CSS/style.css" rel="stylesheet">
</head>
<body>
<%
int ID=0;
String url="";
try{
while(rs.next()){
ID=rs.getInt("id");
url=rs.getString("url");
}
}catch(Exception e){
System.out.println(e.getMessage());
}
%>
<img src="<%=url%>" width="800" height="600">
<a href="http://tomcatlin.gicp.net:8080/myweb/xiangce.jsp?">下一页</a>
</body>
</html>
问题：我想点击下一张时显示id=2所对应url的图片，继续点显示第3，4.。。。。。点击上一张同样显示。请各位老师帮忙