jsp中实现分页

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<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="java.sql.*"%>
<html>
<title>分页显示(jsp版)</title>
<body>

   <%! int pageSize = 5;//每页显示的记录数
          int pageCount = 0;//总页数
    %>
   <%
Connection con;
String DatabaseDriver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
String CnnStr = "jdbc:microsoft:sqlserver://127.0.0.1:1433;databasename=Shopping";
try {
Class.forName(DatabaseDriver);
con = DriverManager.getConnection(CnnStr, "sa", "11");
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);//可滚动查询数据的结果集
ResultSet rs = stmt.executeQuery("select * from ProductInfo order by P_ID");
rs.last(); //让游标到表中的最后一行
int rowCount = rs.getRow(); //获取记录总数.
//out.print("总记录数为"+rowCount);
//总页数的计算公式
pageCount = (rowCount % pageSize == 0) ? (rowCount / pageSize ) : (rowCount / pageSize +1);
int showPage = 1;//当前页
%>

<%
//取得用户所指定的页
String goToPage = request.getParameter("showPage");
if (goToPage == null){
goToPage = "1";
}

//转换成整形
try{
showPage = Integer.parseInt(goToPage);
}
catch (NumberFormatException ex){
showPage = 1;
}

//当前页小于等于第一页则按第一页算如果当前页大于等于总页数则为最后页
if(showPage <=1){
showPage = 1;
}
else if(showPage >= pageCount){
showPage = pageCount;
}

//游标的位置 (当前页 - 1) * 页面大小 + 1
int posion = (showPage -1 ) * pageSize + 1;
//设置游标的位置
rs.absolute(posion);
%>

<table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>商品号</th>
<th>商品名称</th>
</tr>
<%
int i =0;
//循环显示表中的数据 pageSize(每页所显示的记录)
//rs.isAfterLast() 游标是否在最后一行之后说明后面已经没记录
while(i<pageSize && !rs.isAfterLast()){
%>
<tr>
<td><%=rs.getString(1)%></td>
<td><%=rs.getString(2)%></td>
</tr>
<%rs.next();i++;}%>
</table>

<table width="624">
<form action="" method="get">

<tr>
<td>
<%if(showPage < pageCount){%>
<a href="Noname1.jsp?showPage=<%=showPage+1%>">[下一页]</a>
<%}%>
</td>
<td><%if(showPage > 1){%>
<a href="Noname1.jsp?showPage=<%=showPage-1%>">[上一页]</a>
<%}%>
</td>

<td> 共<%=pageCount%>页 </td>
<td> 第<%=showPage%>页 </td>
<td> <a href="Noname1.jsp?showPage=1">『首页』</a> </td>
<td> <a href="Noname1.jsp?showPage=<%=pageCount%>">『尾页』</a> </td>
<td> <%=rowCount%> </td>
<td>
转到<input type="text" name="showPage" size="4"></input>
<input type="submit" name="go" value="提交"></input>
</td>
</tr>
</form>
</table>
<%
con.close();
} catch (ClassNotFoundException e1) {out.print(e1.getMessage());}
catch(SQLException e2){ out.print(e2.getMessage());}
%>
</body>

</html>