大项目之网上书城（七）——书页面以及加入购物车Servlet
程序员文章站
2022-03-19 23:26:44
咳咳，那么说改动，就是完善了下书的显示页面，同时完善了下各分类的主页，还有写了个添加图书到购物车的Servlet。还有就是给所有的页面的body都加了个width:1400px;margin:0 auto;也就是把整体居中，并且把宽度固定。因为今天去机房，电脑比我笔记本宽，页面显示就很丑。于是干脆固... ......
大项目之网上书城（七）——书页面以及加入购物车servlet
主要改动
时间不多是常事啊，话说今天去机房打的代码，可能是因为桌子比较低（还是高？）总之很不适应，敲了几个小时之后背疼得厉害。。
咳咳，那么说改动，就是完善了下书的显示页面，同时完善了下各分类的主页，还有写了个添加图书到购物车的servlet。还有就是给所有的页面的body都加了个width:1400px;margin:0 auto;也就是把整体居中，并且把宽度固定。因为今天去机房，电脑比我笔记本宽，页面显示就很丑。于是干脆固定下。哦，对了，还在数据库加了个事件，每天凌晨1点自动判断每本书是否是新书。
1.shu.jsp
代码
这个是服装类图书的shu.jsp，其他分类的类似。都是复制粘贴加小修。
<%@page import="java.util.hashmap"%>
<%@page import="java.util.map"%>
<%@page import="cn.edu.bdu.mc.utils.cookieutil"%>
<%@page import="cn.edu.bdu.mc.services.impls.bookserviceimpl"%>
<%@page import="cn.edu.bdu.mc.services.bookservice"%>
<%@page import="cn.edu.bdu.mc.beans.book"%>
<%@ page language="java" contenttype="text/html; charset=utf-8"
pageencoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!doctype html>
<html>
<head>
<% map<string,string>map = new hashmap<string,string>();
map.put("clothing","服装");
map.put("food","食品");
map.put("net_literature","网络文学");
map.put("pai","好书拍卖");
map.put("residence","家居");
map.put("sport","运动户外");
map.put("nursery","育婴童");
bookservice bookservice = new bookserviceimpl();
int er_id = integer.parseint(request.getparameter("er_id"));
book book = bookservice.findbookbyclazzander_id("clothing",er_id);
bookservice.click(book.getbook_id());
cookie[] cookies = request.getcookies();
cookie cookie = cookieutil.findcookiebyname(cookies, "bookhistory");
cookie.setvalue(book.getbook_id()+"#"+cookie.getvalue());
cookie.setpath("/bookstore");
if(cookie.getvalue().split("#").length>5){
cookie.setvalue(cookie.getvalue().substring(0,cookie.getvalue().lastindexof("#")));
}
response.addcookie(cookie);
%>
<title><%=book.getbook_name() %></title>
<style type="text/css">
.inc{
float:left;
margin-left:3%;
margin-top:1%;
width:16%;
height:90%;
background-color:rgba(160,128,255,0.8);
}
</style>
<script type="text/javascript" src="${pagecontext.request.contextpath}/jquery-3.3.1/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="${pagecontext.request.contextpath}/client/js/shu.js"></script>
</head>
<body style="background-color:#bbb;width:1400px;margin:0 auto">
<!-- 调用头部页面 -->
<div style="width:100%;height:100px;float:left">
<jsp:include page="/client/head.jsp"></jsp:include>
</div>
<!-- 通用内容体大小 -->
<div style="width:70%;height:886px;float:left;margin-left:15%;">
<!-- 二级导航 -->
<jsp:include page="/client/head2.jsp"></jsp:include>
<!-- 通用界面 -->
<div style="width:100%;height:800px;float:left;margin-top:2%;background-color:#ccc;">
<div style="width:100%;height:48%;float:left;margin-top:2%;margin-left:2%;">
<div style="width:30%;height:100%;background-color:rgba(111,123,145,0.8);float:left">
<img alt="图书" src="${pagecontext.request.contextpath}/shuimgbyid?book_id=<%=book.getbook_id() %>" style="width:100%;"/>
</div>
<div style="width:60%;margin-left:8%;height:100%;float:left">
<h2 style="margin-left:2%;float:left;width:94%"><%=book.getbook_name() %>(一本你不容错过的好书！)</h2>
<p style="margin-left:2%;float:left;width:94%;height:30%;">详情：<%=book.getdescribtion() %><a style="margin-left:2%;" href="./">点击</a>查看更多同类好书！</p>
<h2 style="margin-left:2%;margin-top:1%;float:left;width:94%;color:rgba(200,0,0,0.8);text-align:center;background-color:rgba(64,123,233,0.4);height:18%;line-height:200%;">惊爆价：<%=book.getprice() %> 元
<font style="color:rgba(0,0,0,0.6);font-size:24px;"><del>原价：<%double price = (int)(book.getprice()*1.4)-0.01; %><%=price %> 元</del></font>
</h2>
<font style="margin-left:2%;margin-top:1%;float:left;width:94%;font-size:16px;">类别：<%=map.get(book.getclazz()) %></font>
<font style="margin-left:2%;margin-top:1%;float:left;font-size:16px;">点击量：<%=book.getclick_num() %></font>
<font style="margin-left:2%;margin-top:1%;float:left;font-size:16px;">购买量：<%=book.getbuy_num() %></font>
<font style="margin-left:2%;margin-top:1%;float:left;font-size:16px;">热度：<%=book.getre_du() %></font>
<font style="margin-left:2%;margin-top:1%;float:left;width:94%;font-size:16px;">剩余数量：<%=book.getcount() %></font>
<% if(request.getsession().getattribute("user")==null){ %>
<font style="margin-left:2%;margin-top:1%;float:left;"><a href="${pagecontext.request.contextpath}/client/login.jsp">登录</a>后可购买书籍。</font>
<% }else{ %>
<a style="margin-left:2%;margin-top:1%;float:left;" href="${pagecontext.request.contextpath}/addintocart?book_id=<%=book.getbook_id() %>">加入购物车</a>
<a style="margin-left:2%;margin-top:1%;float:left;" href="${pagecontext.request.contextpath}/neworder?book_id_list=<%=book.getbook_id() %>">购买</a>
<% } %>
</div>
</div>
<div style="width:96%;height:40%;float:left;margin-top:2%;margin-left:2%;">
<div style="width:100%;height:15%;text-align:center;line-height:50px;background-color:rgba(85,107,47,0.8);float:left">
<font color="#ddd" style="font-size:20px;">为您推荐热门书籍</font>
</div>
<div style="width:100%;height:85%;text-align:center;line-height:45px;background-color:rgba(85,139,84,0.8);float:left">
<div class="inc" style="margin-left:4%">
<img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=1" style="width:100%;height:100%" id="re1"/>
</div>
<div class="inc">
<img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=2" style="width:100%;height:100%" id="re2"/>
</div>
<div class="inc">
<img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=3" style="width:100%;height:100%" id="re3"/>
</div>
<div class="inc">
<img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=4" style="width:100%;height:100%" id="re4"/>
</div>
<div class="inc">
<img alt="图书" src="${pagecontext.request.contextpath}/xinshuimg?shu=5" style="width:100%;height:100%" id="re5"/>
</div>
</div>
</div>
</div>
</div>
<!-- 调用底部页面 -->
<div style="width:100%;height:60px;float:left">
<jsp:include page="/client/foot.jsp"></jsp:include>
</div>
</body>
</html>
效果图
2.shu.js
代码
$(function(){
$("img").each(function(){
$(this).css("height",$(this).parent().css("height"));
});
$("#re1").click(function(){
$.post("../../xinshuming?shu=1",function(data){
window.location.href="../"+data.split("@")[2];
});
});
$("#re2").click(function(){
$.post("../../xinshuming?shu=2",function(data){
window.location.href="../"+data.split("@")[2];
});
});
$("#re3").click(function(){
$.post("../../xinshuming?shu=3",function(data){
window.location.href="../"+data.split("@")[2];
});
});
$("#re4").click(function(){
$.post("../../xinshuming?shu=4",function(data){
window.location.href="../"+data.split("@")[2];
});
});
$("#re5").click(function(){
$.post("../../xinshuming?shu=5",function(data){
window.location.href="../"+data.split("@")[2];
});
});
});
3.index.jsp
代码
同样只放服装类图书的主页。
<%@page import="cn.edu.bdu.mc.services.impls.bookserviceimpl"%>
<%@page import="cn.edu.bdu.mc.beans.book"%>
<%@page import="java.util.list"%>
<%@ page language="java" contenttype="text/html; charset=utf-8"
pageencoding="utf-8"%>
<!doctype html>
<html>
<head>
<title>主页</title>
<style type="text/css">
.inc{
float:left;
margin-left:3%;
margin-top:4%;
width:16%;
height:25%;
background-color:rgba(160,128,255,0.8);
}
</style>
<script type="text/javascript" src="${pagecontext.request.contextpath}/jquery-3.3.1/jquery-3.3.1.min.js"></script>
<script type="text/javascript">
$(function(){
$("img").click(function(){
var book_id=$(this)[0].src.split("=")[1];
if(book_id!=0){
$.post("../../findpagebyid?book_id="+book_id,function(data){
window.location.href=data.split("/")[1];
});
}
});
});
</script>
</head>
<body style="background-color:#bbb;width:1400px;margin:0 auto">
<!-- 调用头部页面 -->
<div style="width:100%;height:100px;float:left">
<jsp:include page="/client/head.jsp"></jsp:include>
</div>
<!-- 通用内容体大小 -->
<div style="width:70%;height:886px;float:left;margin-left:15%;">
<!-- 二级导航 -->
<jsp:include page="/client/head2.jsp"></jsp:include>
<img id="a1">
<!-- 通用界面 -->
<div style="width:100%;height:800px;float:left;margin-top:2%;background-color:#ccc;">
<% list<book>list = new bookserviceimpl().findbookbyclazz("clothing");
int i=1;
for(book book:list){
if(i>15){break;}%>
<div class="inc" <%if(i%5==1){ %>style="margin-left:4%"<%} %>>
<img alt="图书" src="${pagecontext.request.contextpath}/shuimgbyid?book_id=<%=book.getbook_id() %>" style="width:100%;height:100%;float:left;"/>
</div>
<%
};
%>
</div>
</div>
<!-- 调用底部页面 -->
<div style="width:100%;height:60px;float:left">
<jsp:include page="/client/foot.jsp"></jsp:include>
</div>
</body>
</html>
效果图
4.findbookbyclazz
代码
@override
public list<book> findbookbyclazz(string clazz) throws sqlexception {
list<book> list = dao.findallbook();
list<book> newlist = new arraylist<>();
//lambda表达式，emmmm，的确可读性不太好的样子。
list.foreach(book->{if(book.getclazz().equals(clazz)){newlist.add(book);}});
/*
相当于
for (book book : newlist) {
if(book.getclazz().equals(clazz)){
newlist.add(book);
}
}
*/
return newlist;
}
5.mysql判断是否新书事件
代码
同样是从sql文件里摘出来的，不知道能不能行，我本身对事件不是太了解。
delimiter ;; create definer=`root`@`localhost` event `temp_event` on schedule every 1 day starts '2019-06-21 01:00:00' on completion preserve enable do update book set is_new=0 where to_days(now())-to_days(book.insert_date)>2 ;; delimiter ;
6.addintocartservlet
代码
package cn.edu.bdu.mc.servlets;
import java.io.ioexception;
import java.sql.sqlexception;
import java.util.arraylist;
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 javax.servlet.http.httpsession;
import cn.edu.bdu.mc.beans.book;
import cn.edu.bdu.mc.daos.impls.bookdaoimpl;
import cn.edu.bdu.mc.services.impls.bookserviceimpl;
/**
* servlet implementation class addintocartservlet
*/
@webservlet("/addintocart")
public class addintocartservlet extends httpservlet {
private static final long serialversionuid = 1l;
/**
* @see httpservlet#httpservlet()
*/
public addintocartservlet() {
super();
// todo auto-generated constructor stub
}
/**
* @see httpservlet#doget(httpservletrequest request, httpservletresponse response)
*/
protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
try {
int book_id = integer.parseint(request.getparameter("book_id"));
httpsession session = request.getsession();
list<book> cart = (list<book>) session.getattribute("cart");
if(cart==null) {
cart = new arraylist<book>();
session.setattribute("cart", cart);
}
cart.add(new bookdaoimpl().findbookbyid(book_id));
string htmlcode="<!doctype html>\n" +
"<html>"
+ "<head>"
+ "<link rel=\"stylesheet\" href=\""+request.getcontextpath()+"/bootstrap-3.3.7-dist/css/bootstrap.min.css\">"
+ "</head>"
+ "<body>"
+ "<div style=\"position:absolute;left:44%;top:46%;height:100px;width:240px;background-color:rgba(145, 162, 196, 0.9);border:1px;text-align:center;\"id=\"quit1\">\r\n" +
" <h3>加入购物车成功！</h3><a class=\"btn btn-info\" href=\""+request.getcontextpath()+"/client/index.jsp\">继续购买</a> "
+"<a class=\"btn btn-info\" href=\""+request.getcontextpath()+"/client/cart.jsp\">查看购物车</a>\n" +
"</div>"
+ "</body>"
+ "</html>";
response.getwriter().write(htmlcode);
} catch (sqlexception e) {
// todo auto-generated catch block
e.printstacktrace();
}
}
/**
* @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)
*/
protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
// todo auto-generated method stub
doget(request, response);
}
}
效果图
上一篇： RSA加密方法
下一篇： 二进制数据和文件之间相互转换的方法