关系型数据库 |
MongoDB |
database(数据库) |
database(数据库) |
table(表) |
collection(集合) |
row(行) |
document(文档) |
column(列) |
filed(域) |
index(索引) |
index(索引) |
table joins(表关系) |
无 |
primary key(主键) |
自动将_id字段设置为主键 |
由上表可知,在我们熟悉的关系型数据库中,具体的实体表对应MongoDB中的集合,表中的行对应MongoDB集合中的文档,表中的列对应MongoDB文档中的域,最关键的主键在MongoDB中是系统自动生成,MongoDB自动的生成的主键是按照特定的方法来生成,具体有12个字节,12字节按照如下方式生成:
0|1|2|3 | 4|5|6 | 7|8 | 9|10|11
时间戳 | 机器 | PID | 计数器
以上是个人初步学习MongoDB的介绍,如有错误,欢迎各位圆友指正。
说完了概念,就要到具体运用,MongoDB中存入和读取的数据格式均为BSON格式,BSON格式是一种类似JSON格式的数据,其具体样式如下所示:
/* 7 createdAt:2016/11/22 下午3:52:51*/ { "_id" : ObjectId("5833f953e9d60125601a8c8b"), "sid" : "7", "sname" : "红米Note4", "sprice" : "899" }, /* 8 createdAt:2016/11/22 下午3:53:19*/ { "_id" : ObjectId("5833f96fe9d60125601a8c8c"), "sid" : "8", "sname" : "平凡的世界", "sprice" : "99" }, /* 9 createdAt:2016/11/22 下午3:53:43*/ { "_id" : ObjectId("5833f987e9d60125601a8c8d"), "sid" : "9", "sname" : "斗罗大陆", "sprice" : "199" },
当我们从MongoDB数据库查询获取数据后,其格式为BSON格式,不能直接与客户端获取的数据进行匹配。在这里,我在获取数据库中BSON格式数据后,调用MongoDB驱动包中BSON.toMap()方法,把BSON格式转换为Map键值对格式的字符串,然后调用Map中Map.get(“name”)方法,获取其中具体键值对的值,从而实现与客户端页面中数据的匹配。
最后,最关键的一点就是,在新建项目中导入MongoDB驱动包,方便客户端和业务层操作数据库。这里我使用的是mongo-java-driver-3.3.0.jar包,其各版本驱动包下载链接:http://central.maven.org/maven2/org/mongodb/mongo-java-driver/
2.5 核心功能代码讲解
(1)用户登录功能
实现用户登录,主要是由login_action.jsp脚本中代码来实现,代码中已给出具体注释,具体如下:
%@ page language="java" import="java.util.*,com.mongodb.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>My JSP 'login_action.jsp' starting page/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> !-- link rel="stylesheet" type="text/css" href="styles.css"> --> /head> body> % response.setContentType("text/html;charset=utf-8"); //确保显示的汉字信息以正确编码方式显示 request.setCharacterEncoding("utf-8"); //确保获取的汉字信息以正确编码方法获取 String userName=(String)request.getParameter("username"); //获取登录页面用户名 String passWord=(String)request.getParameter("password");//获取登陆页面密码 String checkBox = request.getParameter("save_password");//获取登陆页面记住密码选择框属性值 boolean login_test = false; //设定登陆布尔值,若用户名和密码成功匹配,则为true try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //此处采用无用户名和密码验证方式登陆 @SuppressWarnings("deprecation") DB db = mongoClient.getDB( "library" ); //连接到数据库library DBCollection coll = db.getCollection("userInfo"); //获取library数据库中集合userInfo System.out.println("Collection userInfo selected successfully"); DBCursor cursor = coll.find(); //查询集合userInfo中文档信息 int i=1; while (cursor.hasNext()) { //检索集合userInfo中所有文档信息 System.out.println("userInfo Document: "+i); DBObject show = cursor.next(); System.out.println(show); @SuppressWarnings("rawtypes") Map show1 = show.toMap(); //将检索结果show(Bson类型)转换为Map类型 String toname = (String)show1.get("username"); //提取Map中字段名为username的属性值 String topassword = (String)show1.get("password"); //提取Map中字段名为password的属性值 if(toname.equals(userName) topassword.equals(passWord)){ //将从数据库中获取的用户名和密码与表单中获取的数据进行验证,匹配成功则使login_test值为true System.out.println("登陆成功!!!!!"+"username:"+toname+" password:"+topassword); //request.getRequestDispatcher("welcome.jsp").forward(request, response); login_test = true; } System.out.println(show1.get("username")); i++; } }catch(Exception e){ System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } if(login_test) { if ("save".equals(checkBox)) { //Cookie存取时用URLEncoder.encode进行编码(PS:读取时URLDecoder.decode进行解码) String name1 = java.net.URLEncoder.encode(userName,"UTF-8"); //创建两个Cookie对象 Cookie nameCookie = new Cookie("username", name1); //设置Cookie的有效期为3天 nameCookie.setMaxAge(60 * 60 * 24 * 3); String pwd = java.net.URLEncoder.encode(passWord,"UTF-8"); Cookie pwdCookie = new Cookie("password", pwd); pwdCookie.setMaxAge(60 * 60 * 24 * 3); response.addCookie(nameCookie); response.addCookie(pwdCookie); } // request.getRequestDispatcher("welcome.jsp").forward(request, response); response.sendRedirect("welcome.jsp"); } else{ response.sendRedirect("login_Fail.jsp"); // request.getRequestDispatcher("loginFail.jsp").forward(request, response); } %> /body> /html>
(2)用户注册功能
用户注册功能实现原理基本和用户登录一致,唯一的区别在于用户登录是查询数据库,而用户注册是写入数据库,此处就不贴具体代码,在下面具体编码中展示。
(3)记住密码功能
实现记住密码,此处使用两个Cookie,当用户正确登录时,Cookie_one获取用户名,并添加到当前浏览器Cookie中,Cookie_two获取密码,也添加到当前浏览器Cookie中。在登录首页用户名和密码两个输入框中的value值填写系统从Cookie中获取的用户名和密码,从而实现记住密码功能。具体如下:
if(login_test) { if ("save".equals(checkBox)) { //Cookie存取时用URLEncoder.encode进行编码(PS:读取时URLDecoder.decode进行解码) String name1 = java.net.URLEncoder.encode(userName,"UTF-8"); //创建两个Cookie对象 Cookie nameCookie = new Cookie("username", name1); //设置Cookie的有效期为3天 nameCookie.setMaxAge(60 * 60 * 24 * 3); String pwd = java.net.URLEncoder.encode(passWord,"UTF-8"); Cookie pwdCookie = new Cookie("password", pwd); pwdCookie.setMaxAge(60 * 60 * 24 * 3); response.addCookie(nameCookie); response.addCookie(pwdCookie); } // request.getRequestDispatcher("welcome.jsp").forward(request, response); response.sendRedirect("welcome.jsp"); } else{ response.sendRedirect("login_Fail.jsp"); // request.getRequestDispatcher("loginFail.jsp").forward(request, response); }
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String username = ""; String password = ""; //获取当前站点的所有Cookie Cookie[] cookies = request.getCookies(); for (int i = 0; i cookies.length; i++) { //对cookies中的数据进行遍历,找到用户名、密码的数据 if ("username".equals(cookies[i].getName())) { //读取时URLDecoder.decode进行解码(PS:Cookie存取时用URLEncoder.encode进行编码) username = java.net.URLDecoder.decode(cookies[i].getValue(),"UTF-8"); } else if ("password".equals(cookies[i].getName())) { password = java.net.URLDecoder.decode(cookies[i].getValue(),"UTF-8"); } } %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>登陆页面/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="content-type" content="text/html; charset=UTF-8"> meta http-equiv="description" content="This is my page"> link rel="stylesheet" type="text/css" href="css/login.css"> /head> body> div class="content"> div class="head"> h1>简单购物车/h1> /div> !-- 登录面板 --> div class="panel"> form action="login_action.jsp" method="post"> !-- 账号和密码组 --> div class="group"> label>账号/label> input type="text" placeholder="请输入账号" name="username" value="%=username%>"> /div> div class="group"> label>密码/label> input type="password" placeholder="请输入密码" name="password" value="%=password%>"> /div> div> input type="checkbox" value="save" name="save_password"> label>记住密码/label> /div> div class="group"> label>/label> /div> !-- 登录按钮 --> div class="login"> button type="submit" name="login">登陆/button> button type="reset" name="reset">重置/button> /div> /form> /div> !-- 注册按钮 --> div class="register"> button onclick="window.location.href='register.jsp'">创建新账号/button> /div> /div> /body> /html>
(4)查询商品和购买商品
此处功能主要是操作MongoDB数据库,返回商品的具体信息,只要弄懂用户登录功能后,此处的功能代码就会很快弄明白,具体代码在后面展示。
(5)购物车
此处的功能也是主要操作MongoDB数据,通过和客户端的用户交互,实现购物车相关功能,具体代码在后面展示。
2.6 具体编码
具体编码的讲解,就按照实现功能大致顺序来介绍,具体如下:
2.6.1用户登录和记住密码
首先看是登录首页login.jsp页面,为了显示美观,此物使用一个login.css文件(后面多个页面均是使用login.css文件)。login.css具体代码如下:
@CHARSET "UTF-8"; /*按照样图要求,添加一个浅灰色背景*/ body{ background-color: #F2F2F2; } /*设置内容模块距离顶部一个有一段距离100px*/ .content { margin-top: 80px; } /*登录和注册按钮的整体样式*/ .content button { height: 30px;/*登录和注册按钮的高度*/ color: white;/*登录和注册按钮字体颜色为白色*/ font-size: 18px;/*登录和注册按钮的字体大小*/ border: 0px;/*无边框*/ padding: 0px;/*无内边距*/ cursor: pointer;/*登录和注册按钮的选择时为手形状*/ } /*头部名称*/ .content .head { text-align: center;/*子内容居中*/ } /*登录面板*/ .content .panel { background-color: white;/*登录面板背景颜色为白色*/ width: 302px;/*宽度为302px*/ text-align: center;/*子内容居中*/ margin: 0px auto;/*自身居中*/ padding-top: 10px;/*顶部的内边距为20px*/ padding-bottom: 10px;/*底部的内边距为20px*/ border: 1px solid #ddd;/*边框颜色为灰色*/ border-radius: 5px;/*边框边角有5px的弧度*/ } /*购物主页购物面板*/ .content .panel1 { background-color: white;/*购物主页面板背景颜色为白色*/ width: 1000px;/*宽度为600px*/ text-align: center;/*子内容居中*/ margin: 0px auto;/*自身居中*/ border: 1px solid #ddd;/*边框颜色为灰色*/ border-radius: 5px;/*边框边角有5px的弧度*/ } /*登录和密码组*/ .content .panel .group { text-align: left;/*子内容居中*/ width: 262px;/*宽度为262px*/ margin: 0px auto 20px;/*自身居中,并距离底部有20px的间距*/ } .content .panel .group label { line-height: 30px;/*高度为30px*/ font-size: 18px;/*字体大小为18px*/ } .content .panel .group input { display: block;/*设置为块,是为了让输入框独占一行*/ width: 250px;/*宽度为250px*/ height: 30px;/*高度为30px*/ border: 1px solid #ddd;/*输入框的边框*/ padding: 0px 0px 0px 10px;/*左边内边距为10px,显得美观*/ font-size: 16px;/*字体大小*/ } .content .panel .group input:focus{ border-left: 1px solid #CC865E;/*当输入框成为焦点时,左边框颜色编程褐色*/ } .content .panel .login button { background-color: #CC865E;/*按钮的背景颜色*/ width: 130px;/*按钮的宽度*/ } .content .panel .login button:hover { background-color: white;/*按钮选中后背景颜色为白色*/ color: #CC865E;/*按钮选中后字体颜色为褐色*/ border: 1px solid #CC865E;/*按钮选中后边框颜色为褐色*/ } /*注册按钮*/ .content .register { text-align: center;/*子内容居中*/ margin-top: 20px;/*顶部的内边距为20px*/ } .content .register button { background-color: #466BAF;/*按钮的背景颜色为蓝色*/ width: 180px;/*按钮的宽度*/ } .content .register button:hover { background-color: white;/*按钮选中后背景颜色为白色*/ color: #466BAF;/*按钮选中后字体颜色为蓝色*/ border: 1px solid #466BAF;/*按钮选中后边框颜色为蓝色*/ }
Login.jsp具体代码如下:
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String username = ""; String password = ""; //获取当前站点的所有Cookie Cookie[] cookies = request.getCookies(); for (int i = 0; i cookies.length; i++) { //对cookies中的数据进行遍历,找到用户名、密码的数据 if ("username".equals(cookies[i].getName())) { //读取时URLDecoder.decode进行解码(PS:Cookie存取时用URLEncoder.encode进行编码) username = java.net.URLDecoder.decode(cookies[i].getValue(),"UTF-8"); } else if ("password".equals(cookies[i].getName())) { password = java.net.URLDecoder.decode(cookies[i].getValue(),"UTF-8"); } } %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>登陆页面/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="content-type" content="text/html; charset=UTF-8"> meta http-equiv="description" content="This is my page"> link rel="stylesheet" type="text/css" href="css/login.css"> /head> body> div class="content"> div class="head"> h1>简单购物车/h1> /div> !-- 登录面板 --> div class="panel"> form action="login_action.jsp" method="post"> !-- 账号和密码组 --> div class="group"> label>账号/label> input type="text" placeholder="请输入账号" name="username" value="%=username%>"> /div> div class="group"> label>密码/label> input type="password" placeholder="请输入密码" name="password" value="%=password%>"> /div> div> input type="checkbox" value="save" name="save_password"> label>记住密码/label> /div> div class="group"> label>/label> /div> !-- 登录按钮 --> div class="login"> button type="submit" name="login">登陆/button> button type="reset" name="reset">重置/button> /div> /form> /div> !-- 注册按钮 --> div class="register"> button onclick="window.location.href='register.jsp'">创建新账号/button> /div> /div> /body> /html>
登录处理脚本login_action.jsp代码如下:
%@ page language="java" import="java.util.*,com.mongodb.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>My JSP 'login_action.jsp' starting page/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> !-- link rel="stylesheet" type="text/css" href="styles.css"> --> /head> body> % response.setContentType("text/html;charset=utf-8"); //确保显示的汉字信息以正确编码方式显示 request.setCharacterEncoding("utf-8"); //确保获取的汉字信息以正确编码方法获取 String userName=(String)request.getParameter("username"); //获取登录页面用户名 String passWord=(String)request.getParameter("password");//获取登陆页面密码 String checkBox = request.getParameter("save_password");//获取登陆页面记住密码选择框属性值 boolean login_test = false; //设定登陆布尔值,若用户名和密码成功匹配,则为true try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //此处采用无用户名和密码验证方式登陆 @SuppressWarnings("deprecation") DB db = mongoClient.getDB( "library" ); //连接到数据库library DBCollection coll = db.getCollection("userInfo"); //获取library数据库中集合userInfo System.out.println("Collection userInfo selected successfully"); DBCursor cursor = coll.find(); //查询集合userInfo中文档信息 int i=1; while (cursor.hasNext()) { //检索集合userInfo中所有文档信息 System.out.println("userInfo Document: "+i); DBObject show = cursor.next(); System.out.println(show); @SuppressWarnings("rawtypes") Map show1 = show.toMap(); //将检索结果show(Bson类型)转换为Map类型 String toname = (String)show1.get("username"); //提取Map中字段名为username的属性值 String topassword = (String)show1.get("password"); //提取Map中字段名为password的属性值 if(toname.equals(userName) topassword.equals(passWord)){ //将从数据库中获取的用户名和密码与表单中获取的数据进行验证,匹配成功则使login_test值为true System.out.println("登陆成功!!!!!"+"username:"+toname+" password:"+topassword); //request.getRequestDispatcher("welcome.jsp").forward(request, response); login_test = true; } System.out.println(show1.get("username")); i++; } }catch(Exception e){ System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } if(login_test) { if ("save".equals(checkBox)) { //Cookie存取时用URLEncoder.encode进行编码(PS:读取时URLDecoder.decode进行解码) String name1 = java.net.URLEncoder.encode(userName,"UTF-8"); //创建两个Cookie对象 Cookie nameCookie = new Cookie("username", name1); //设置Cookie的有效期为3天 nameCookie.setMaxAge(60 * 60 * 24 * 3); String pwd = java.net.URLEncoder.encode(passWord,"UTF-8"); Cookie pwdCookie = new Cookie("password", pwd); pwdCookie.setMaxAge(60 * 60 * 24 * 3); response.addCookie(nameCookie); response.addCookie(pwdCookie); } // request.getRequestDispatcher("welcome.jsp").forward(request, response); response.sendRedirect("welcome.jsp"); } else{ response.sendRedirect("login_Fail.jsp"); // request.getRequestDispatcher("loginFail.jsp").forward(request, response); } %> /body> /html>
登录失败login_Fail.jsp页面代码如下:
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>登陆失败/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> link rel="stylesheet" type="text/css" href="css/login.css"> /head> body> div class="content"> div class="panel1"> h1>输入用户名和密码不正确,请重新登陆!!!/h1> /div> div class="register"> button onclick="window.location.href='login.jsp'">返回/button> /div> /div> /body> /html>
2.6.2用户注册
注册首页register.jsp页面代码如下:
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>注册页面/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="content-type" content="text/html; charset=UTF-8"> meta http-equiv="description" content="This is my page"> link rel="stylesheet" type="text/css" href="css/login.css"> Script Language="JavaScript"> function check() { var tmp,str; str=document.myform.password1.value; tmp=document.myform.password2.value; if(str != tmp) alert("两次密码输入不一致,请重新确认密码!!!"); } /Script> /head> body> div class="content"> div class="head"> h1>欢迎来到简单购物车系统注册页面/h1> /div> !-- 注册面板 --> div class="panel"> form name="myform" action="register_action.jsp" method="post"> !-- 账号和密码组 --> div class="group"> label>/label> input type="text" placeholder="请输入注册账号" name="username1"> /div> div class="group"> label>/label> input type="password" placeholder="请输入注册密码" name="password1"> /div> div class="group"> label>/label> input type="password" placeholder="请确认注册密码" name="password2"> /div> !-- 注册按钮 --> div class="login"> button type="submit" name="register" onclick="check()">注册/button> button type="reset" name="reset1">重置/button> /div> /form> div class="register"> button onclick="window.location.href='login.jsp'">返回/button> /div> /div> /div> /body> /html>
注册处理脚本register_action.jsp代码如下;
%@ page language="java" import="java.util.*,com.mongodb.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String text_change = "等待注册"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>My JSP 'register_action.jsp' starting page/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> meta http-equiv="description" content="This is my page"> /head> body> % response.setContentType("text/html;charset=utf-8"); //确保显示的汉字信息以正确编码方式显示 request.setCharacterEncoding("utf-8"); //确保获取的汉字信息以正确编码方法获取 String userName1=(String)request.getParameter("username1"); //获取页面用户名 String passWord1=(String)request.getParameter("password1");//获取注册页面密码1 String passWord2=(String)request.getParameter("password2");//获取注册页面密码2 if(!passWord1.equals(passWord2)){ //如果用户两次输入密码不一致,则跳转到注册原页面register.jsp,即实现未跳转效果 response.sendRedirect("register.jsp"); } try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //此处采用无用户名和密码验证方式登陆 @SuppressWarnings("deprecation") DB db = mongoClient.getDB( "library" ); //连接到数据库library DBCollection coll = db.getCollection("userInfo"); //获取library数据库中集合userInfo System.out.println("Collection userInfo selected successfully"); DBObject user = new BasicDBObject();//定义一个Bson变量,用于存储注册的用户名和密码 user.put("username", userName1); user.put("password", passWord1); coll.insert(user); //向集合userInfo中插入注册用户信息 response.sendRedirect("register_success.jsp"); //注册成功后,自动跳转到注册成功提示页面 }catch(Exception e){ System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } %> /body> /html>
成功注册提示页面register_success.jsp页面代码如下:
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>注册成功/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> link rel="stylesheet" type="text/css" href="css/login.css"> /head> body> div class="content"> div class="panel1"> h1>恭喜您,您已经成功注册简单购物车系统/h1> /div> div class="register"> button onclick="window.location.href='login.jsp'">返回/button> /div> /div> /body> /html>
2.6.3查看商品
首先看一下购物首页welcome.jsp页面代码:
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>购物页面/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> !-- link rel="stylesheet" type="text/css" href="styles.css"> --> /head> frameset rows="30%,60%,10%" cols="*" frameborder="no" border="0" framespacing="0"> frame src="header.jsp"> frame src="main_shop.jsp"> frame src="bottom.jsp"> /frameset> body> /body> /html>
首页头部header.jsp页面代码:
%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312" pageEncoding="gb2312"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> meta http-equiv="Content-Type" content="text/html;charset=gb2312"> /head> body topmargin="0" leftmargin="0" rightmargin="0" style="background-color: #F2F2F2;overflow-x:hidden;overflow-y:hidden"> form action=""> table width="100%" height="79" border="0" cellpadding="0" cellspacing="0" align=center> tr> td bgcolor="F9A859" valign="top"> table width="100%" height="100" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#466BAF"> tr> td align="center" style="font-size:60px;color: white;"> 简单购物车系统 /td> /tr> /table> /td> /tr> tr> td bgcolor="F9A859" valign="top"> table width="100%" height="50" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#CC865E"> tr> td align="center" style="font-size:20px;color: white;"> 欢迎你访问!/td> /tr> /table> /td> /tr> /table> /form> /body> /html>
尾部bottom.jsp页面代码:
%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>My JSP 'bottom.jsp' starting page/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> /head> body style="background-color: #F2F2F2;overflow-x:hidden;overflow-y:hidden"> hr> h4 style="width:100%;text-align:center">Copyright @2016 舞动的心/h4> /body> /html>
首页中间主体main_shop.jsp页面代码;
%@ page contentType="text/html;charset=GBK" import="java.util.*,com.liuzhen.shop.MongodbBean" %> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String cp=request.getParameter("cp");//cp为分页数 //int page_number = DBBean.getTotalPage(); //int currpage = page_number; int currpage=(cp==null||cp=="")?1:Integer.parseInt(cp); String[][] ss = MongodbBean.getGoodList(currpage); int n = MongodbBean.getlength(ss); %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>购物页面/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> link rel="stylesheet" type="text/css" href="css/login.css"> /head> body style="overflow-x:hidden;overflow-y:hidden"> div class="content"> div class="panel1"> table border="1" align="center"> tr> th width="30%" align="center">物品编号/th> th width="30%" align="center">物品名/th> th width="30%" align="center">定价/th> th width="50%" align="center">求购/th> /tr> % for(int i=0;in;i++) { %> tr> td height="30%" align="center">%= ss[i][0] %>/td> td height="30%" align="center">%= ss[i][1] %>/td> td height="30%" align="center">%= ss[i][2] %>/td> td height="30%" align="center">a href="Buy.jsp?sid=%= ss[i][0] %>action=buy">购买/a>/td> /tr> % } %> /table> % int tp=MongodbBean.getTotalPage(); if(currpage!=1) { %> a href="main_shop.jsp?cp=%=currpage-1%>">上一页/a> % } if(currpage!=tp) { %> a href="main_shop.jsp?cp=%=currpage+1%>">下一页/a> % } %> form action="main_shop.jsp" name="myform"> select name="cp" onchange="document.myform.submit()"> % for(int i=1;i=tp;i++) { %> option value="%=i%>" %= (i==currpage)?"selected":"" %>>第%=i%>页/option> % } %> /select> /form> /div> div class="register"> button onclick="window.location.href='Cart.jsp'">查看购物车/button> /div> /div> /body> /html>
实现查看商品的功能,主要是通过调用MongodbBean.java类来实现,其具体代码如下:
package com.liuzhen.shop; import java.util.Map; import java.util.Vector; import com.mongodb.*; public class MongodbBean { static int span=5; //设定JSP页面表单单页显示物品信息行数为5行 //返回数据库中全部货物编号sid public static String[] getGood_sid(){ String[] good_sid_temporary = new String[100]; //定义一个长度为100的暂时存放货物编号的一维数组 // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //此处采用无用户名和密码验证方式登陆 @SuppressWarnings("deprecation") DB db = mongoClient.getDB( "library" ); //连接到数据库library DBCollection coll = db.getCollection("good"); //获取library数据库中集合good System.out.println("Collection userInfo selected successfully"); DBCursor cursor = coll.find(); //查询集合good中文档信息 int i=0; while (cursor.hasNext()) { //检索集合good中所有文档信息 DBObject show = cursor.next(); @SuppressWarnings("rawtypes") Map show1 = show.toMap(); //将检索结果show(Bson类型)转换为Map类型 String tosid = (String)show1.get("sid"); //提取Map中字段名为sid的属性值 good_sid_temporary[i] = tosid; //将数据库中查询的货物编号存储入数组good_sid i++; } String[] good_sid = new String[i]; //根据查询数据遍历集合中文档信息i值来确定最终返回数组长度 for(int j=0;ji;j++){ good_sid[j] = good_sid_temporary[j]; } return good_sid; } //返回数据库中全部货物名称sname public static String[] getGood_sname(){ String[] good_sname_temporary = new String[100]; //定义一个长度为100的暂时存放货物名称的一维数组 // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //此处采用无用户名和密码验证方式登陆 @SuppressWarnings("deprecation") DB db = mongoClient.getDB( "library" ); //连接到数据库library DBCollection coll = db.getCollection("good"); //获取library数据库中集合good System.out.println("Collection userInfo selected successfully"); DBCursor cursor = coll.find(); //查询集合good中文档信息 int i=0; while (cursor.hasNext()) { //检索集合good中所有文档信息 DBObject show = cursor.next(); @SuppressWarnings("rawtypes") Map show1 = show.toMap(); //将检索结果show(Bson类型)转换为Map类型 String tosname = (String)show1.get("sname"); //提取Map中字段名为sname的属性值 good_sname_temporary[i] = tosname; //将数据库中查询的货物名称存储入数组good_sname i++; } String[] good_sname = new String[i]; //根据查询数据遍历集合中文档信息i值来确定最终返回数组长度 for(int j=0;ji;j++){ good_sname[j] = good_sname_temporary[j]; } return good_sname; } //返回数据库中全部货物价格sprice public static String[] getGood_sprice(){ String[] good_sprice_temporary = new String[100]; //定义一个长度为100的暂时存放货物价格的一维数组 // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "localhost" , 27017 ); //此处采用无用户名和密码验证方式登陆 @SuppressWarnings("deprecation") DB db = mongoClient.getDB( "library" ); //连接到数据库library DBCollection coll = db.getCollection("good"); //获取library数据库中集合good System.out.println("Collection userInfo selected successfully"); DBCursor cursor = coll.find(); //查询集合good中文档信息 int i=0; while (cursor.hasNext()) { //检索集合good中所有文档信息 DBObject show = cursor.next(); @SuppressWarnings("rawtypes") Map show1 = show.toMap(); //将检索结果show(Bson类型)转换为Map类型 String tosprice = (String)show1.get("sprice"); //提取Map中字段名为sname的属性值 good_sprice_temporary[i] = tosprice; //将数组库中查询的货物价格存储入数组good_sprice i++; } String[] good_sprice = new String[i]; //根据查询数据遍历集合中文档信息i值来确定最终返回数组长度 for(int j=0;ji;j++){ good_sprice[j] = good_sprice_temporary[j]; } return good_sprice; } //根据分页当前page数,从数据库中获取当前单个页面货物种类的具体信息,并以二维数据返回具体信息 public static String[][] getGoodList(int page) { String[][] result=null; VectorString[]> v=new VectorString[]>(); //定义一个Vector集合,一个记录存放一个货物的具体信息 String[] good_sid = getGood_sid(); //获取货物编号 String[] good_sname = getGood_sname(); //获取货物名称 String[] good_sprice = getGood_sprice(); //获取货物价格 int len = good_sid.length; for(int i=0;ispan;i++){ int t = (page-1)*span+i; //获取货物编号 if(t >= len){ //如果当前货物编号大于数据库中已有编号,则跳出循环 break; } String[] good_temp=new String[3]; //定义一个长度为3的数组,用于存放一个物品的编号、名称、价格信息 good_temp[0]=good_sid[t]; good_temp[1]=good_sname[t]; good_temp[2]=good_sprice[t]; v.add(good_temp); //将1个物品的信息存入Vector集合中 } int size = v.size(); result=new String[size][]; //根据Vercotr大小,给result指定行数大小 for(int j=0;jsize;j++) { //返回Vector中一个值(其中即表示一个物品的sid,名称和价格),并赋值给result[j],即result二维数组一行表示一个物品具体信息 result[j]=(String[])v.elementAt(j); } return result; } //根据货物sid,返回其价格信息 public static double getPrice(String sid) { double price = 0; //定义返回物品的价格 String[] good_sprice = getGood_sprice(); //获取全部物品的价格 int i = Integer.parseInt(sid); //将String类型的物品编号sid转换为int型 String sprice = good_sprice[i]; //根据sid获取物品的价格 price = Double.parseDouble(sprice); //将String类型的价格信息转换为double型,并赋值给price return price; } //根据货物sid,返回货物的名称和价格,一一个长度为2的数组返回 public static String[] getDetail(String sid) { String[] good_detail=null; good_detail = new String[2]; String[] good_sname = getGood_sname(); //获取全部物品名称 String[] good_sprice = getGood_sprice(); //获取全部物品价格 int i = Integer.parseInt(sid); //将String类型的物品编号sid转换为int型 good_detail[0] = good_sname[i]; //根据物品编号sid,得到名称存入数组good_detail中 good_detail[1] = good_sprice[i]; //根据物品编号sid,得到物品价格存入数组good_detail中 return good_detail; } //通过查询数据库中货物种类数目,以5行为一页,返回现有货物页数 public static int getTotalPage() { int page = 0; String[] good_sid = getGood_sid(); int len = good_sid.length; page = len/span+((len%span==0)?0:1); //以span(span值为5)行为一页,计算货物具有的页数page return page; } //返回一个二维数组的行数大小 public static int getlength(String[][] a){ return a.length; } public static void main(String args[]){ // String[] good_sid = getGood_sid(); //定义一个存放货物编号的一维数组 // String[] good_sname = getGood_sname(); //定义一个存放货物名称的一维数组 // String[] good_sprice = getGood_sprice(); //定义一个存放货物价格的一维数组 // // for(int j=0;j10;j++){ // System.out.println("货物sid:"+good_sid[j]); // System.out.println("货物sname:"+good_sname[j]); // System.out.println("货物是price:"+good_sprice[j]); // System.out.println("**************************"); // System.out.println(); // } System.out.println("分页数目(测试):"+MongodbBean.getTotalPage()); String[][] ss=MongodbBean.getGoodList(MongodbBean.getTotalPage()); for(int i=0;iss.length;i++) { System.out.println(ss[i][0]); System.out.println(ss[i][1]); System.out.println(ss[i][2]); System.out.println("***********"); } int n = ss.length; System.out.println("数组长度为:"+n); } }
2.6.4购买商品
实现购买商品,通过Buy.jsp业务处理脚本调用ShopCartBean.java类来实现。
ShopCartBean.java类代码如下:
package com.liuzhen.shop; import java.util.HashMap; import java.util.Iterator; import java.util.Set; public class ShopCartBean { //ShopCartBean类构造函数 public ShopCartBean(){ } //定义一个存储整形数值的键值对hashMap HashMapString, Integer> hm=new HashMapString, Integer>(); //定义购物车总物品总价格,初始值为0 double total=0; //添加购买的物品,存入哈希表hm中,并计算购买成功后的总价格 public void add(String sid) { if(hm.containsKey(sid)) { //如果hm中包含键值对sid,则获取该键值对中的值,并加1 int xc=((Integer)hm.get(sid)).intValue()+1; //把上面获取的xc值存入hm中 hm.put(sid,new Integer(xc));; } else { //如果hm中不包含键值对sid,则将该键值对存入hm中,并该键值对值为1 hm.put(sid,new Integer(1)); } total=total+MongodbBean.getPrice(sid); //购买物品后,计算物品总价格 } //获取购物车当前物品总价格 public double getTotal() { return total; } //根据物品编号sid,设定购买物品数目,并将购买数目存入哈希表hm中,并更新当前购物车物品总价格 public void setCount(int c,String sid) { int yc=((Integer)hm.get(sid)).intValue(); total=total+(c-yc)*MongodbBean.getPrice(sid); hm.put(sid,new Integer(c)); } //根据物品编号sid,从购物车中删除物品,并删除存入哈希表hm中物品的数目,以及当前购物车物品总价格 public void deleteFromCart(String sid) { int yc=((Integer)hm.get(sid)).intValue(); total=total-yc*MongodbBean.getPrice(sid); hm.remove(sid); } //判断当前哈希表hm是否为空 public boolean isEmpty() { return hm.isEmpty(); } //返回用户购买物品的详细信息(物品编号、物品名称、物品价格、物品购买数量) public String[][] getCart() { //定义一个set集合,存放哈希表hm中键值对的键名称 SetString> ks=hm.keySet(); //定义一个迭代器,用于遍历set集合 IteratorString> ii=ks.iterator(); //获取哈希表hm中键值对的个数 int size=hm.size(); //定义二维数组,存放购买物品的信息 String rs[][]=new String[size][]; for(int i=0;isize;i++) { String sid=(String)ii.next(); //存放键值对的键名,即货物的编号sid String[] sa=new String[4]; sa[0]=sid; //获取购买货物sid String[] sat=MongodbBean.getDetail(sid); //根据货物sid,获取购买货物的名称和价格 sa[1]=sat[0]; //获取购买货物名称 sa[2]=sat[1]; //获取购买货物价格 sa[3]=((Integer)hm.get(sid)).toString(); //获取购买货物数量 rs[i]=sa; //将上述单个物品详细存入二维数组rs中 } return rs; } }
Buy.jps购物处理脚本代码如下:
%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" pageEncoding="gb2312"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> jsp:useBean id="cart" scope="session" class="com.liuzhen.shop.ShopCartBean"/> % String action=request.getParameter("action"); if(action==null) { %> jsp:forward page="main_shop.jsp"/> % } else if(action.trim().equals("buy")) { String sid=request.getParameter("sid"); cart.add(sid.trim()); %> jsp:forward page="main_shop.jsp"/> % } else if(action.trim().equals("gc")) { String sid=request.getParameter("sid"); String count=request.getParameter("count"); cart.setCount(Integer.parseInt(count),sid); %> jsp:forward page="Cart.jsp"/> % } else if(action.trim().equals("del")) { String sid=request.getParameter("sid"); cart.deleteFromCart(sid); %> jsp:forward page="Cart.jsp"/> % } %> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> !-- link rel="stylesheet" type="text/css" href="styles.css"> --> /head> body> /body> /html>
2.6.5购物车
购物车功能,主要是用过Cart.jsp页面调用ShopCartBean.java类来实现,ShopCartBean.java类代码在上面已给出,下面请看Cart.jsp购物车页面代码:
%@ page language="java" import="java.util.*" contentType="text/html;charset=gb2312" import="com.liuzhen.shop.MongodbBean" pageEncoding="gb2312"%> % String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> jsp:useBean id="cart" scope="session" class="com.liuzhen.shop.ShopCartBean"/> !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> html> head> base href="%=basePath%>"> title>购物车/title> meta http-equiv="pragma" content="no-cache"> meta http-equiv="cache-control" content="no-cache"> meta http-equiv="expires" content="0"> meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> meta http-equiv="description" content="This is my page"> meta http-equiv="Content-Type" content="text/html;charset=gb2312"> link rel="stylesheet" type="text/css" href="css/login.css"> /head> body> div class="content"> div class="panel1"> % if(cart.isEmpty()) { %> font color="red" size="20">购物车中没有任何商品!!!/Font> % } else { %> h2>购物车/h2> table border="1"> tr> td width="27%" align="center">物品编号/td> td width="27%" align="center">物品名/td> td width="27%" align="center">定价/td> td width="27%" align="center">数量/td> td width="27%" align="center">求购/td> /tr> % String[][] ssa=cart.getCart(); for(int i=0;issa.length;i++) { %> tr> td height="30%" align="center">%= ssa[i][0] %>/td> td height="30%" align="center">%= ssa[i][1] %>/td> td height="30%" align="center">%= ssa[i][2] %>/td> td> form action="Buy.jsp" method="post"> input type="text" name="count" value="%= ssa[i][3] %>"> input type="hidden" name="sid" value="%= ssa[i][0] %>"> input type="hidden" name="action" value="gc"> /form> /td> td>a href="Buy.jsp?sid=%= ssa[i][0] %>action=del">删除/a>/td> /tr> % } %> /table> br> br> 本订单总价为:%= Math.round(cart.getTotal()*100)/100.0%> % } %> br> div class="register"> button onclick="window.location.href='main_shop.jsp'">继续购物/button> /div> /div> /div> /body> /html>
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