易买网之实现商品分页

易买网是我为期2个星期的一个项目，下面简单介绍一下商品分页。

第一步：创建商品实体类

package entity;

public class easybuy_productn {
    private int  ep_id ;//编号
    private String  ep_name  ;//名字
    private String  ep_description ;//描述
    private int  ep_price;//价格
    private int  ep_stock  ;//库存
    private int  epc_id ;//父类id
    private int  epc_child_id ;//二级id
    private String  ep_file_name  ;//文件名
    private int  tiaoma ;//条码号
    public int getEp_id() {
        return ep_id;
    }
    public void setEp_id(int epId) {
        ep_id = epId;
    }
    public String getEp_name() {
        return ep_name;
    }
    public void setEp_name(String epName) {
        ep_name = epName;
    }
    public String getEp_description() {
        return ep_description;
    }
    public void setEp_description(String epDescription) {
        ep_description = epDescription;
    }
    public int getEp_price() {
        return ep_price;
    }
    public void setEp_price(int epPrice) {
        ep_price = epPrice;
    }
    public int getEp_stock() {
        return ep_stock;
    }
    public void setEp_stock(int epStock) {
        ep_stock = epStock;
    }
    public int getEpc_id() {
        return epc_id;
    }
    public void setEpc_id(int epcId) {
        epc_id = epcId;
    }
    public int getEpc_child_id() {
        return epc_child_id;
    }
    public void setEpc_child_id(int epcChildId) {
        epc_child_id = epcChildId;
    }
    public String getEp_file_name() {
        return ep_file_name;
    }
    public void setEp_file_name(String epFileName) {
        ep_file_name = epFileName;
    }
    public int getTiaoma() {
        return tiaoma;
    }
    public void setTiaoma(int tiaoma) {
        this.tiaoma = tiaoma;
    }
}

第二步：编写SQL语句

public List<easybuy_productn> findproductList() {

        List<easybuy_productn> listck = new ArrayList<easybuy_productn>();

        con = super.getConnection();

        try {
            st = con.prepareStatement("select * from easybuy_productn");

            rs = st.executeQuery();

            while(rs.next()){
                easybuy_productn product = new easybuy_productn();
                product.setEp_id(rs.getInt(1));
                product.setEp_name(rs.getString(2));
                product.setEp_description(rs.getString(3));
                product.setEp_price(rs.getInt(4));
                product.setEp_stock(rs.getInt(5));
                product.setEpc_id(rs.getInt(6));
                product.setEpc_child_id(rs.getInt(7));
                product.setEp_file_name(rs.getString(8));
                product.setTiaoma(rs.getInt(9));

                    listck.add(product);

            }
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            super.ShiFang(rs, st, con);
        }
        return listck;

    }

第三步：分页语句：

/*
 * 分页
 */

public List<easybuy_productn> fengye(int pageIndex,int pageSize){

    con=super.getConnection();

String sql="select * from (select t.*,rownum r from "+
"(select * from easybuy_productn order by  ep_id desc)"+
"t where rownum  <= "+(pageIndex*pageSize)+") where r>"+(pageSize*(pageIndex-1));

try {

st=con.prepareStatement(sql);

productlist = new ArrayList<easybuy_productn>();

rs=st.executeQuery();
while(rs.next()){

    easybuy_productn product = new easybuy_productn();
    product.setEp_id(rs.getInt(1));
    product.setEp_name(rs.getString(2));
    product.setEp_description(rs.getString(3));
    product.setEp_price(rs.getInt(4));
    product.setEp_stock(rs.getInt(5));
    product.setEpc_id(rs.getInt(6));
    product.setEpc_child_id(rs.getInt(7));
    product.setEp_file_name(rs.getString(8));
    product.setTiaoma(rs.getInt(9));

    productlist.add(product);
}

return productlist;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
   }

  }
//商品总数除于要分的条数
public int getTotalPages(int count,int pageSize){
    int totalpages=0;

   totalpages=(count%pageSize==0)?(count/pageSize):(count/pageSize+1);
    return totalpages;

}
//获取商品总条数
public int getConut(){

    int count=0;
    con=super.getConnection();

    String sql="select * from easybuy_productn";

    try {
        st=con.prepareStatement(sql);
        rs=st.executeQuery();
        while(rs.next()){
            count++;
        }
        return count;

    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return 0;
    }

}

第四步：jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="entity.easybuy_productn"%>
<%@page import="Biz.Impl.productnBizImpl"%>
<%@page import="Biz.productnBiz"%>
<%@page import="Dao.Impl.productnDaoImpl"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
<%@page import="entity.easybuy_product"%>
<%@page import="Biz.Impl.productBizImpl"%>
<%@page import="Biz.productBiz"%>
<%@page import="Dao.Impl.productDaoImpl"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
  <%
  request.setCharacterEncoding("utf-8");
  String name=(String)session.getAttribute("name");

 %>

 <%

//==============分页===============
    //设置新闻显示条数
    int pageSize=5;
//实例化
productnDaoImpl newxw=new productnDaoImpl();
//获取数据库有多少条数据
int count=newxw.getConut();

//获取页码
String page1=request.getParameter("pageIndex");

//得到具体要分的页
int pag=newxw.getTotalPages(newxw.getConut(),pageSize);
//得到当前页
int pageIndex=0;

//判断得到的值是否有值
if(page1==null){
    pageIndex=1;

    //查询

}else{
    //把当前页赋值给pageIndex
    pageIndex=Integer.parseInt(page1);
      //判断当前页是否为最大页
    if(pageIndex>pag){
        pageIndex=pag;
    }

}

List<easybuy_productn> product=newxw.fengye(pageIndex,pageSize);
request.setAttribute("list",product);

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
<title>后台管理 - 易买网</title>
<link type="text/css" rel="stylesheet" href="css/style.css" />
<script  type="text/javascript">
function Delete(id)
{
    if(confirm("确定要删除吗？")) {
        location.href = "delectproduct?id=" + id;
    }
}

</script>
<script type="text/javascript" src="../scripts/function-manage.js"></script>
</head>
<body>
<div id="header" class="wrap">
    <div id="logo"><img src="images/logo.gif" /></div>
    <div class="help"><a href="index.jsp">返回前台页面</a></div>
    <div class="navbar">
        <ul class="clearfix">
            <li><a href="manage/index.jsp">首页</a></li>
            <li><a href="manage/user.jsp">用户</a></li>
            <li class="current"><a href="manage/product.jsp">商品</a></li>
            <li><a href="manage/order.jsp">订单</a></li>
            <li><a href="manage/guestbook.jsp">留言</a></li>
            <li><a href="manage/news.jsp">新闻</a></li>
        </ul>
    </div>
</div>
<div id="childNav">
    <div class="welcome wrap">
        管理员:<%=name%>  您好，今天是2015-06-12，欢迎回到管理后台。
    </div>
</div>
<div id="position" class="wrap">
    您现在的位置：<a href="manage/index.jsp">易买网</a> &gt; 管理后台
</div>
<div id="main" class="wrap">
    <div id="menu-mng" class="lefter">
        <div class="box">
            <dl>
                <dt>用户管理</dt>
                <dd><em><a href="manage/user-add.jsp">新增</a></em><a href="manage/user.jsp">用户管理</a></dd>
                <dt>商品信息</dt>
                <dd><em><a href="manage/productClass-add.jsp">新增</a></em><a href="manage/productClass.jsp">分类管理</a></dd>
                <dd><em><a href="manage/product-add.jsp">新增</a></em><a href="manage/product.jsp">商品管理</a></dd>
                <dt>订单管理</dt>
                <dd><a href="manage/order.jsp">订单管理</a></dd>
                <dt>留言管理</dt>
                <dd><a href="manage/guestbook.jsp">留言管理</a></dd>
                <dt>新闻管理</dt>
                <dd><em><a href="manage/news-add.jsp">新增</a></em><a href="manage/news.jsp">新闻管理</a></dd>
            </dl>
        </div>
    </div>
    <div class="main">
        <h2>商品管理</h2>
        <div class="manage">
            <table class="list">
            <%
    //创建用户业务逻辑对象
    productnBiz prodctbiz = new productnBizImpl();

    List<easybuy_productn> product1 = prodctbiz.findproductList();
     request.setAttribute("product",product);
%>
                <tr>
                    <td>ID</td>
                    <td>商品名称</td>
                    <td>操作</td>
                </tr>
                <c:forEach var="news" items="${requestScope.product}" >
                <tr>

                    <td class="first w4 c">${news.ep_id}</td>
                    <td class="thumb"><img src="${news.ep_file_name}" width="50px"/><a href="product-view.jsp" target="_blank">${news.ep_name}</a></td>
                    <td class="w1 c"><a href="manage/product-modify.jsp?id=${news.ep_id}">修改</a> <a href="javascript:Delete(${news.ep_id})">删除</a></td>

                </tr>
                </c:forEach>

            </table>
            <div class="pager">
            <ul class="clearfix">
                                    <li>当前页数：[<%=pageIndex %>/<%=pag%>]
              <%
                //判断当前页是否为末页
              if(pageIndex>1){
                 %>
                 <a href="manage/product.jsp?pageIndex=<%=1 %>"> 首页</a>
                <a href="manage/product.jsp?pageIndex=<%=pageIndex-1%>"> 上一页 </a>

                  <%
                      }
                    //判断当前页是否为末页
                 if(pageIndex<pag){
                  %>
                  <a href="manage/product.jsp?pageIndex=<%=pageIndex+1 %>"> 下一页</a>
                   <a href="manage/product.jsp?pageIndex=<%=pag%>"> 末页 </a>

                <%
                    }

                        %></li>
            </ul>

            </div>
        </div>
    </div>
    <div class="clear"></div>
</div>
<div id="footer">
    Copyright &copy; 2010 易买网络 All Rights Reserved. 京ICP证1000001号
</div>
</body>
</html>