我下载了这样一个例子，并学习他做一个查询并显示列表
不过很多地方不明白，希望各位指教

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第一部分是servlet  ：SelectServlet

    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        DataBean db = new DataBean();
        String selectValue="";
        if (request.getParameter("selectValue") != null)
        {
            selectValue = request.getParameter("selectValue");

            int page;
            if (request.getParameter("page") != null)
            {
                page = Integer.parseInt(request.getParameter("page"));
            }
            else
            {
                page = 1;
            }
            if (request.getParameter("action") != null)
            {
                if (request.getParameter("action").equals("frist"))
                {
                    page = 1;
                }
                else if (request.getParameter("action").equals("last"))
                {
                    page = db.PAGECOUNT;
                }
                else if (request.getParameter("action").equals("back"))
                {
                    page -= 1;
                }
                else if (request.getParameter("action").equals("frist"))
                {
                    page += 1;
                }

            }
           ArrayList list = db.selectCDBean(selectValue, page, 10);
           request.getSession().removeAttribute("selectList");
           request.getSession().setAttribute("selectList",list);
            int pagecount=db.PAGECOUNT;
            request.setAttribute("selectValue",selectValue);
            request.setAttribute("page",page);
            request.setAttribute("pagecount",pagecount);

        }
        RequestDispatcher rd=request.getRequestDispatcher("select.jsp?select="+selectValue);
        rd.forward(request,response);

    }

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第二部分是Bean：  DataBean

    public ArrayList selectCDBean(String selectValue, int page, int count) //查询分页
    {
        ArrayList list = new ArrayList();
        if (!checkParameter(selectValue))
        {
            selectValue = "";
        }
        try
        {
            proc = conn.prepareCall("{call proc_page(?,?,?,?)}");
            proc.setInt(1, page);
            proc.setInt(2, count);
            proc.setString(3, selectValue);
            proc.registerOutParameter(4, Types.INTEGER); //OUTPUT参数 返回结构共多少页
            res = proc.executeQuery(); //接收存储过程的结果集
            while (res.next()) //提取结果集的每条记录
            {
                CDBean cb = new CDBean();
                cb.setCdAlbum(res.getString("CDalbum"));
                cb.setCdCompany(res.getString("CDcompany"));
                cb.setCdName(res.getString("CDname"));
                cb.setCdId(res.getLong("CDid"));
                cb.setCdType(getCDType(res.getInt("CDtypeId")));
                list.add(cb);
            }
            PAGECOUNT = proc.getInt(4);
        }
        catch (SQLException ex)
        {
            ex.printStackTrace();
        }
        return list;

    }

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之后我按照他的方法自己做了个类似的

servlet:

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException 
{
int parentid;
if (request.getParameter("parentid")==null)
{
parentid=0;
}
else
{
parentid=Integer.parseInt(request.getParameter("parentid"));
ClassManageBean mb = new ClassManageBean();
ArrayList list = mb.classList(parentid);
request.getSession().setAttribute("classname", list);
}

response.sendRedirect("admin/classManage.jsp");
}

bean：

public ArrayList classList(int parentid)
{
conn= new DBConn().getConn();
ArrayList list = new ArrayList();
String sql = "select * from news_type where parentid=? order by classid";
try
{
prepar = conn.prepareStatement(sql);
            prepar.setInt(1, parentid);
            res = prepar.executeQuery();
            while (res.next())
            {
             News_Type nt = new News_Type();
             nt.setClassid(res.getInt("classid"));
             nt.setClassname(res.getString("classname"));
             nt.setDepth(res.getInt("Depth"));
             nt.setParentid(res.getInt("parentid"));
             nt.setType(res.getString("Type"));
             list.add(nt);
            }
}
catch(SQLException ex)
{
ex.printStackTrace();
}
return list;

}
}

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现在是问题了，例子是用jstl做的，我还不会，请问如何在页面把这个list的值用列表表现出来
我是第一次做项目，问题很初级不要笑我

8 个解决方案