图书购买系统之商品分类分页--根据主页面传来的值分类显示商品并实现动态分页功能
1.实现效果图
2.home.jsp,主页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
bootstore
<%@include file="/foreground/common/head.jsp"%>
%>/img/otherimages/home_book.PNG)
新书上架
JAVA入门经典
《Java入门经典》，是2012年出版的图书，是2012年出版的图书是2012年出版的图书作者是Rogers Cadenhead。 《Java入门经典(第6版)》总共24章，先讲解了Java程序的编写流程、工作原理等内容；然后介绍了有关Java编程 的基本知识，包括变量、条件语句、
%>/img/otherimages/home_book2.PNG)
%>/img/bookimage/20285763-1_b.jpg)
%>/img/bookimage/20412979-1_b.jpg)
3.home.js
//输入框键盘弹起事件，在这里发送ajax请求
$(function(){
$("#searchContent").keyup(function(){
//设置ajax请求url和请求内容
var sendUrl = contextPath+"/AjaxShowSearchProductNameServlet?time"+new Date().getTime();
var sendDate = {
"value":$("#searchContent").val()
}
//发送ajax请求
$.ajax({
type:"post",
url:sendUrl,
data:sendDate,
async:true,
//请求成功的回调函数
success:function(backData,textStatus,xmlHttprequest){
var ss = backData.split(",");
var childDiv = "";
for(var i = 0;i < ss.length;i++){
childDiv +="" + ss[i] + "";
}
//显示搜索框
$("#searchResult").html(childDiv);
$("#searchResult").show();
}
});
});
});
//选中搜索列表中的一条数据，设置为搜索框内容
function setSearchContent(caller){
$("#searchContent").val($(caller).html());
$("#searchResult").hide();
}
//搜索功能
function doSearch(){
//获取要搜索的内容
var category = $("#searchContent").val();
//alert(contextPath+"/ShowBlurProductsServlet?category="+category);
window.location.href = contextPath+"/ShowBlurProductsServlet?category="+category;
}4.bookcategory.jsp,分页页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
bookcategory
<%@include file="/foreground/common/head.jsp"%>
%>/img/otherimages/productlist.gif)
%>/${book.imgurl})
书名：${book.name}
售价：${book.price}
5.bookcategory.js
//1.路径导航部分
//截取从home.html传过来的URL
$(function(){
var url = window.location.search;//从问号 (?) 开始的 URL（查询部分），此时等号后面是乱码
url = decodeURI(url);//解码，把乱码变成正常的文字
var substr = url.substr(url.indexOf("category=")+9);//截取字符串，截取category=之后的内容
$("#navpath").html(substr);//将截取到的字符串放到路径导航的位置
});
//2.添加购物车部分
//思路：把添加购物车的数据存放在localStorage中
//方法传参：书的id，书名，书售价，书的库存
function addCart(id,name,price,num){
//1.创建一个js对象
var book = {
"product_id":id, //书的id
"name":name, //书名
"price":price, //售价
"num":num, //库存
"buynum":1 //购买数量
}
//2.获取已经保存的数据
var storebook = localStorage.getItem("carts");
//3.将已经获取到的数据转换成数组
var bookArr = JSON.parse(storebook);//JSON.parse() 方法解析一个JSON字符串
//如果购物车离得数据为空，说明从来没有保存过数据
if(bookArr == null){
//创建一个数组
var books = new Array();
//把要保存的数据存到数组中
books.push(book);
//将数组转换成字符串
var bookstr = JSON.stringify(books);
//将字符串保存到localStorge中
localStorage.setItem("carts",bookstr);
}
//已经存过数据了
else{
//1.判断我们存的书籍是否已经在购物车了，如果存在，数量+1
var isFind = false;
for(var i = 0;i < bookArr.length; i++){
var b = bookArr[i];
if(b.product_id == book.product_id){
b.buynum++;
isFind = true;
break;
}
}
//2.如果不存在，将书籍添加到购物车中
if(isFind == false){
bookArr.push(book);
}
//3.把bookArr重新转换成字符串保存
var s = JSON.stringify(bookArr);
localStorage.setItem("carts",s);
}
alert("添加成功！");
}6.ShowProductsServlet.java,处理书籍信息显示
package com.chinasoft.servlet;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.chinasoft.dao.impl.ImplProductDao;
import com.chinasoft.entity.PageBean;
/**
* @author jf
* 处理书籍信息的显示
*/
@WebServlet("/ShowProductsServlet")
public class ShowProductsServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public ShowProductsServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取请求参数
String currentPage = request.getParameter("currentPage");
String category = request.getParameter("category");
//2.根据请求参数查询数据库
ImplProductDao implProductDao = new ImplProductDao();
try {
PageBean bookPage = implProductDao.findPageBooks(Integer.parseInt(currentPage), 8, category);
//3.保存数据、跳转页面
request.getSession().setAttribute("bookPage", bookPage);
request.getRequestDispatcher("/foreground/book/bookcategory.jsp").forward(request, response);
} catch (NumberFormatException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
7.AjaxShowSearchProductNameServlet.java实现模糊查询书名
package com.chinasoft.servlet;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.chinasoft.dao.impl.ImplProductDao;
import com.chinasoft.entity.Product;
/**
* @author jf
* 功能：根据搜索条件返回符合条件的书名
*/
@WebServlet("/AjaxShowSearchProductNameServlet")
public class AjaxShowSearchProductNameServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public AjaxShowSearchProductNameServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取请求参数
String value = request.getParameter("value");
ImplProductDao implProductDao = new ImplProductDao();
try {
//2.根据请求模糊检索数据库
List list = implProductDao.findBooksByBlurName(value);
//3.把所有符合条件的书拼接成字符串
String books = "";
if("".equals(value)){
}else{
for(int i = 0;i0){
books += ",";
}
books += list.get(i).getName();
}
}
//4.向客户端输出字符串
response.getWriter().write(books);
} catch (SQLException e) {
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
8.ShowBlurProductsServlet.java根据搜索框的搜索内容，搜索符合条件的书籍，跳转新页面显示书籍
package com.chinasoft.servlet;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.chinasoft.dao.impl.ImplProductDao;
import com.chinasoft.entity.PageBean;
/**
* @author jf
* 根据搜索框的搜索内容，搜索符合条件的书籍，跳转新页面显示书籍
*/
@WebServlet("/ShowBlurProductsServlet")
public class ShowBlurProductsServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public ShowBlurProductsServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取请求参数
String category = request.getParameter("category");
//2.根据请求参数查询数据库
ImplProductDao implProductDao = new ImplProductDao();
try {
PageBean bookPage = implProductDao.findPageBooksByBlurName(category);
//3.保存数据、跳转页面
request.getSession().setAttribute("bookPage", bookPage);
request.getRequestDispatcher("/foreground/book/bookcategory.jsp").forward(request, response);
}catch (NumberFormatException e) {
e.printStackTrace();
}
catch (SQLException e) {
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
9.ShowProductsServlet.java处理书籍信息的显示
package com.chinasoft.servlet;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.chinasoft.dao.impl.ImplProductDao;
import com.chinasoft.entity.PageBean;
/**
* @author jf
* 处理书籍信息的显示
*/
@WebServlet("/ShowProductsServlet")
public class ShowProductsServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public ShowProductsServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取请求参数
String currentPage = request.getParameter("currentPage");
String category = request.getParameter("category");
//2.根据请求参数查询数据库
ImplProductDao implProductDao = new ImplProductDao();
try {
PageBean bookPage = implProductDao.findPageBooks(Integer.parseInt(currentPage), 8, category);
//3.保存数据、跳转页面
request.getSession().setAttribute("bookPage", bookPage);
request.getRequestDispatcher("/foreground/book/bookcategory.jsp").forward(request, response);
} catch (NumberFormatException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
10.ProductDao.java接口
package com.chinasoft.dao;
import java.sql.SQLException;
import java.util.List;
import com.chinasoft.entity.PageBean;
import com.chinasoft.entity.Product;
public interface ProductDao {
//查找所有的书籍
public List findAllBooks() throws SQLException;
//根据书的id查找指定的书籍
public Product findBookById(String id) throws SQLException;
//查找某一分类下的书籍总数
public long count(String category) throws SQLException;
//分页查询，查找当前页下、每页显示指定size下、以及当前分类下的书籍
public List findBooks(int currentPage, int pageSize,String category) throws SQLException;
//根据指定书名搜索书籍
public Product searchBookByName(String name) throws SQLException;
//模糊检索，根据模糊条件查找数据库，返回list集合
public List findBooksByBlurName(String name) throws SQLException;
//模糊检索，根据模糊条件查找数据库,返回pageBean
public PageBean findPageBooksByBlurName(String name) throws SQLException;
//分页查询，返回pageBean，pegeBean封装了当前页的所有信息
public PageBean findPageBooks(int currentPage, int pageSize,String category) throws SQLException;
} 11.ImplProductDao.java,ProductDao接口实现类
package com.chinasoft.dao.impl;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import com.chinasoft.dao.ProductDao;
import com.chinasoft.entity.PageBean;
import com.chinasoft.entity.Product;
import com.chinasoft.util.C3P0Util;
public class ImplProductDao implements ProductDao{
/**
* 查找所有的书籍
*/
@Override
public List findAllBooks() throws SQLException {
//1.创建QueryRunner对象
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
List list = qr.query("select * from products", new BeanListHandler<>(Product.class));
return list;
}
/**
* 根据书的id查找指定的书籍
*/
@Override
public Product findBookById(String id) throws SQLException {
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
String sql = "select * from products where id=?";
Product product = qr.query(sql,new BeanHandler(Product.class),id);
return product;
}
/**
* 查找某一分类下的书籍总数
*/
@Override
public long count(String category) throws SQLException {
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
String sql = null;
long count = 0;
if ("全部商品目录".equals(category)) {
sql = "select COUNT(*) from products";
count = qr.query(sql, new ScalarHandler<>());
}
else{
sql = "select COUNT(*) from products where category=?";
count = qr.query(sql, new ScalarHandler<>(),category);
}
return count;
}
/**
*
* 分页查询，查找当前页下、每页显示指定size下、以及当前分类下的所有书籍
*/
@Override
public List findBooks(int currentPage, int pageSize, String category) throws SQLException {
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
String sql = null;
List products = null;
if ("全部商品目录".equals(category)) {
sql = "select * from products limit ?,?";
if (currentPage>=1) {
products = qr.query(sql, new BeanListHandler<>(Product.class),(currentPage-1)*pageSize,pageSize);
}
}
else{
sql = "select * from products where category=? limit ?,?";
if (currentPage>=1) {
products = qr.query(sql, new BeanListHandler<>(Product.class), category,(currentPage-1)*pageSize,pageSize);
}
}
return products;
}
/**
* 根据指定书名搜索书籍
*/
@Override
public Product searchBookByName(String name) throws SQLException {
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
String sql = "select * from products where name=?";
Product product = qr.query(sql,new BeanHandler(Product.class),name);
return product;
}
/**
* 模糊检索，根据模糊条件查找数据库，返回list
*/
@Override
public List findBooksByBlurName(String name) throws SQLException {
//1.创建QueryRunner对象
QueryRunner qr = new QueryRunner(C3P0Util.getDataSource());
List list = qr.query("select * from products where name like ?", new BeanListHandler<>(Product.class),"%"+name+"%");
return list;
}
/**
* 模糊检索，根据模糊条件查找数据库，返回pagebean
*/
@SuppressWarnings("unused")
@Override
public PageBean findPageBooksByBlurName(String name) throws SQLException {
// 1.获取符合条件的书的集合
List list = findBooksByBlurName(name);
// 2.获取搜索到的所有书籍的个数
int totalcount = list.size();
// 3.设置当前页和最大页
int currentPage = 1;
int totalPage = 1;
if (totalcount == 0) {
currentPage = 0;
totalPage = 0;
}
// 4.创建PageBean对象
PageBean pageBean = new PageBean();
pageBean.setCurrentPage(currentPage);
pageBean.setTotalCount(totalcount);
pageBean.setTotalPage(totalcount);
pageBean.setCurrentCount(totalcount);
pageBean.setIsblur("yes");
if (list!=null) {
pageBean.setPs(list);
}
pageBean.setCategory(name);
return pageBean;
}
/**
* 分页查询，返回pageBean，pegeBean封装了当前页的所有信息
*/
@Override
public PageBean findPageBooks(int currentPage, int pageSize, String category) throws SQLException {
// 1.获取当前类别下，一页显示pageSize条，当前页所对应的所有书籍
ImplProductDao impl = new ImplProductDao();
List products = impl.findBooks(currentPage, pageSize, category);
// 2.获取当前类别下所有书籍的个数
long totalcount = impl.count(category);
//如果当前分类下 的图书个数为0，则currentPage为0
if (totalcount == 0) {
currentPage = 0;
}
// 3.计算要显示的总页数
int totalpage = (int) Math.ceil(totalcount / (double) pageSize);
// 4.创建PageBean对象
PageBean pageBean = new PageBean();
pageBean.setCurrentPage(currentPage);
pageBean.setTotalCount(totalcount);
pageBean.setTotalPage(totalpage);
pageBean.setCurrentCount(pageSize);
pageBean.setPs(products);
pageBean.setCategory(category);
return pageBean;
}
}