用arraylist实现分页

一般网上介绍的都是用JSP直接查数据库，用ResultSet的结果集分的，我的程序是JSP+Servlet+javaBean的， 懒得用Servlet分啦~ 今天研究下可不可以用ArrayList直接分， 其实很简单，下面是全部的代码，关键看红色


<table width="100%" border="1">
<tr>
     <td height="384" valign="top"><table width="100%" border="1" bgcolor="#FFFFFF" align="left"
       style="FILTER: Alpha(Opacity = 70)">
        <tr><td valign="middle" colspan="11" align="center">
         所有图书信息
        </td>
       </tr>
       <tr>
        <td align="center">
         书号
        </td>
        <td align="center">
         书名
        </td>
        <td align="center">
         类型
        </td>
        <td align="center">
         出版社
        </td>
        <td align="center">
         作者
        </td>
        <td align="center">
         价格
        </td>
        <td align="center">
         页数
        </td>
        <td align="center">
         登记日期
        </td>
        <td align="center">
         是否借出
        </td>
        <th>
        <input type="button" value="添加图书" window.location.href('BookManageServlet?action=7')">
        </th>
       </tr>
       <%
                        int intPageSize;            //一页显示的记录数
                        int intRowCount;            //记录总数
                        int intPageCount;           //总页数
                        int xpage=0;
                        int ypage;
                        intPageSize = 15;           //设置一页显示的记录数
                        int intPage=1;                //待显示页码
                        String strPage;
                        strPage = request.getParameter("page");//取得待显示的页码
                        if(strPage==null){
                         //表明在QueryString中没有page这一个参数，此时显示第一页数据
                         intPage = 1;
                         xpage = 0;
                         ypage = intPageSize;
                        
            } else {
             //将字符串转换成整型
            intPage = java.lang.Integer.parseInt(strPage);
            ypage = intPage*intPageSize;
            xpage = ypage - intPageSize;
           
             if(intPage<1) intPage = 1;
            
          }
          ArrayList arrayList = (ArrayList) session.getAttribute("allBook");
          intPageCount = (arrayList.size() + intPageSize - 1) / intPageSize;
          if(intPage>intPageCount) intPage = intPageCount;
          if(ypage >arrayList.size()) ypage = arrayList.size();//一定要些，不要会数组下标越界哦！
          while(xpage < ypage) {
          book = (BookBean) arrayList.get(xpage);
          String id = book.getId();
       %>
       <form name="form<%=xpage%>" method="post" action="BookManageServlet" onSubmit="return check2();">
       <tr>
        <td align="center"><%=id%></td>
        <td align="center"><%=book.getName()%></td>
        <td align="center"><%=book.getTypeCode()%></td>
        <td align="center"><%=book.getPublisher()%></td>
        <td align="center"><%=book.getAuthor()%></td>
        <td align="center"><%=book.getPrice()%></td>
        <td align="center"><%=book.getPages()%></td>
        <td align="center"><%=book.getCheckinDate()%></td>
        <%
         if (book.getLend() == 0) {
        %>
        <td align="center">
         在库
        </td>
        <%
         }
        %>
        <%
         if (book.getLend() == 1) {
        %>
        <td align="center">
         借出
        </td>
        <%
         }
        %>
                            <%
         if (bookManag.equals("1")) {
        %>
        <td align="center">
         <input type="button" name="update" value="更新"
          onclick='return check("<%=id%>");'>
        </td>
        <td align="center">
         <input type="submit" name="delete" value="删除">
         <input type="hidden" name="id" value=<%=id%>>
         <input type="hidden" name="action" value="2">
        </td>
      
       </tr>
       </form>
       <%
        }
        xpage++;
       }
       %>
              
      </table>

     </td>
    </tr>
   </table>
   <center>
        第<%=intPage%>页 共<%=intPageCount%>页
       
        <% //以下是分页的“上一页”“下一页”，有上一页就有链接，没有就为文字，下一页同理 %>
        <% if(intPage>1){ %>
            <a href="bookManage.jsp?page=<%=intPage-1%>">上一页</a>
        <% }else{ %>
            上一页
        <%}%>
       
        <% if(intPage<intPageCount){ %>
            <a href="bookManage.jsp?page=<%=intPage+1%>">下一页</a>
        <% }else{ %>
            下一页
        <%}%>
     <center>