图书商城 --- 代码回溯2
2019-12-10 本文已影响0人
幽泉流霜
前端显示界面
左侧书籍列表
因为我们的所有分类都是要从后台添加的分类所拿到，所以同理要先进入到相应的servlet，然后转发请求,图书显示也同理
<body>
<%@include file="top.jsp" %>
<div class="container">
<div class="col-md-3">
<jsp:include page="/category"></jsp:include>
</div>
<div class="col-md-9">
<jsp:include page="/bookshow"></jsp:include>
</div>
</div>
</body>
这里要注意因为使用的是动态引入，而且引入的是servlet链接，所以后面的请求转发应写include而不是forword
@WebServlet(name = "catagoryshow",urlPatterns = "/category")
public class catagoryshow extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
CategoryService cs = new CategoryServiceImpl();
List<Category> lc = cs.ShowAllCategory();
req.setAttribute("category",lc);
req.getRequestDispatcher("/FontMain/categoryleft.jsp").include(req,resp);
}
}
- 显示图书
<div class="">
<c:forEach items="${requestScope.books}" var="book">
<div class="bookitem panel panel-primary">
<div class="panel-heading">书名：${book.name}</div>
<div class="panel-body">
<div class="col-sm-6">
<img class="img-responsive" src="../BookImage/${book.image_id}">
</div>
<div class="col-sm-6">
<ul class="list-group">
<li class="list-group-item">书名：${book.name}</li>
<li class="list-group-item">作者：${book.author}</li>
<li class="list-group-item">描述：${book.description}</li>
<li class="list-group-item">价格${book.price}</li>
</ul>
</div>
</div>
<input class="btn btn-primary " type="button" onclick="InsertCart(this);" value="加入购物车">
<p class="hidden">${book.id}</p>
</div>
</c:forEach>
</div>
效果
image.png
用户登录注册
前端页面
- 登录以及注册
<div class="login">
<form action="/registerlogin">
<input type="hidden" name="oper" value = "login">
<div class="form-group">
<label>账号</label>
<input type="text" class="form-control" placeholder="" value = ""name = "luname">
</div>
<div class="form-group">
<label>密码</label>
<input type="password" class="form-control" placeholder="" value="" name="lpwd">
</div>
<button type="submit" class="btn btn-primary">登录</button>
<span class="glyphicon glyphicon-remove exit"></span>
<c:if test="${!empty(requestScope.message2)}">
<p class="result2">用户名或密码错误</p>
</c:if>
</form>
</div>
<div class="register">
<form id = "registerpanel" action="/registerlogin">
<input type="hidden" name="oper" value = "register">
<div class="form-group">
<label>账号</label>
<input type="text" class="form-control" value = ""id = "zhanghao" name = "uname"placeholder="">
</div>
<div class="form-group">
<label>密码</label>
<input type="password" class="form-control" value = ""id = "pwd"placeholder="">
</div>
<div class="form-group">
<label>确认密码</label>
<input type="password" class="form-control" id = "checkpwd" value = ""name = "pwd"placeholder="">
</div>
<div class="form-group">
<label for="exampleInputEmail1">邮箱地址</label>
<input type="email" class="form-control" id="exampleInputEmail1" name = "email" value = ""placeholder="Email">
</div>
<button type="submit" class="btn btn-primary">注册</button>
<span class="glyphicon glyphicon-remove exit"></span>
<c:if test="${!empty(requestScope.message)}">
<p class="result">已注册成功</p>
</c:if>
</form>
</div>
- 遮罩层
<span class="cover"></span>
-js
if(document.getElementById("myname")){
document.getElementById("loginbutton").style.display = "none";
document.getElementById("registerbutton").style.display = "none";
}
function Toactive(obj) {
obj.classList.add("active");
console.log(obj);
}
document.getElementById("loginbutton").onclick = function () {
var mini_login = document.getElementsByClassName("login")[0];
var cover = document.getElementsByClassName("cover")[0];
mini_login.style.display = "block";
cover.style.display = "block";
}
document.getElementById("registerbutton").onclick = function () {
var mini_register = document.getElementsByClassName("register")[0];
var cover = document.getElementsByClassName("cover")[0];
mini_register.style.display = "block";
cover.style.display = "block";
}
document.getElementsByClassName("exit")[0].onclick = function () {
var mini_login = document.getElementsByClassName("login")[0];
var cover = document.getElementsByClassName("cover")[0];
mini_login.style.display = "none";
cover.style.display = "none";
}
document.getElementsByClassName("exit")[1].onclick = function () {
var mini_register = document.getElementsByClassName("register")[0];
var cover = document.getElementsByClassName("cover")[0];
mini_register.style.display = "none";
cover.style.display = "none";
}
完成效果图
denglx.gif
登录servlet
同样 我们将其封装成了函数
private void Login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("登录函数运行");
String luname = req.getParameter("luname");
String lpwd = req.getParameter("lpwd");
if(luname.equals("admin")&&lpwd.equals("admin")){
req.getRequestDispatcher("/BackMain/AddCategory.jsp").forward(req,resp);
}
User u = new User();
u.setUname(luname);
u.setPwd(lpwd);
System.out.println(u);
User nu = us.CheckUser(u);
if(nu !=null){
HttpSession hs=req.getSession();
hs.setAttribute("user",nu);
resp.sendRedirect("/FontMain/Index.jsp");
}else{
req.setAttribute("message2",0);
req.getRequestDispatcher("/FontMain/Index.jsp").forward(req,resp);
}
}
如果登录成功就将用户信息 存储到session中,并在前台隐藏掉登录和删除，然后显示用户名
<c:if test="${!empty(sessionScope.user)}">
<span>欢迎 </span>
<span id="myname">${sessionScope.user.uname}</span>
<a href="/registerlogin?oper=exit">退出</a>
</c:if>
否则就传一个message到前台表示登录不成功
<c:if test="${!empty(requestScope.message2)}">
<p class="result2">用户名或密码错误</p>
</c:if>
购物车设计
为了防止购物车单项重复 并且 方便删除项目
我们新建一个购物车item表示购物车单项
cartitem
public class CartItem {
private Book book;
private int number;
private float price;
//各种get set
}
cart
public class Cart {
private Map<Integer,CartItem> mc = new HashMap<>();
//书籍id 和 购物项
private float allprice;
public void AddBook(Book book){
CartItem cartItem = mc.get(book.id);
if(cartItem ==null){
cartItem = new CartItem();
cartItem.setBook(book);
cartItem.setNumber(1);
mc.put(book.id,cartItem);
}else{
int currentnum = cartItem.getNumber();
cartItem.setNumber(++currentnum);
}
}
public void DeleteItem(int bookid){
mc.remove(bookid);
}
public Map<Integer, CartItem> getMc() {
return mc;
}
public void setMc(Map<Integer, CartItem> mc) {
this.mc = mc;
}
public float getPrice(){
allprice = 0;
for(int i:mc.keySet()){
CartItem ci = mc.get(i);
allprice += ci.getPrice();
}
return allprice;
}
}
加入购物车操作
当我们在前台单击加入购物车的时候，我们用ajax将数据传入到bussiness servlet
<input class="btn btn-primary " type="button" onclick="InsertCart(this);" value="加入购物车">
<script>
function InsertCart(obj) {
alert("已加入购物车");
var bookid = obj.nextElementSibling.innerHTML;
var ajax;
if (window.XMLHttpRequest) {
ajax = new XMLHttpRequest();
} else if (window.ActiveXObject) {
ajax = new ActiveXObject("Msxml2.XMLHTTP");
}
//复写onreadystatechange函数
ajax.onreadystatechange = function () {
if (ajax.readyState == 4) {
}
if (ajax.status == 404) {
}
}
ajax.open("get", "/business?oper=addItem&bookid="+bookid);
ajax.send(null);
}
</script>
bussiness servlet
加入购物车前 我们需要判断用户是否登录
如果没有登录 就在前台传回一个message
HttpSession hs = req.getSession();
User user = (User)hs.getAttribute("user");
if(user ==null){
req.setAttribute("message","请先登录后购买");
req.getRequestDispatcher("/FontMain/Mycart.jsp").forward(req,resp);
}
加入操作
private void AddItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
HttpSession hs = req.getSession();
Cart ct = (Cart)hs.getAttribute("cart");
if( ct== null){
ct = new Cart();
}
int bookid = Integer.parseInt(req.getParameter("bookid"));
BookService bs = new BookServiceImpl();
Book book = bs.FindBook(bookid);
ct.AddBook(book);
hs.setAttribute("cart",ct);
}
为了方便这里我们就不建数据库了 ，直接将购物车的内容放发到了session中，缺点是如果退出登录购物车里的内容就会消失，优点是:可以少写一个dao层
所以用户务必在退出的时候生成订单 ，某种情况下可以促进消费
购物车显示
<c:forEach items="${sessionScope.cart.mc}" var="cartitem">
<div class="container">
<div class="col-sm-2">
<img class="img-responsive" src="../BookImage/${cartitem.value.book.image_id}">
</div>
<div class="col-sm-3">
<ul class="list-group">
<li class="list-group-item list-group-item-info">书名：${cartitem.value.book.name}</li>
<li class="list-group-item list-group-item-info">作者：${cartitem.value.book.author}</li>
<li class="list-group-item list-group-item-info">数量：${cartitem.value.number}</li>
<li class="list-group-item list-group-item-info">价钱：${cartitem.value.price}</li>
</ul>
</div>
<div class="col-sm-2">
<span class="glyphicon glyphicon-remove deleteitem" onclick="DeleteItem(this);"></span>
<div class="hidden">${cartitem.value.book.id}</div>
</div>
</div>
</c:forEach>
删除操作
这里我们类比后台删除图书,同样用ajax完成
private void DeleteItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
HttpSession hs = req.getSession();
Cart ct = (Cart)hs.getAttribute("cart");
int itemid = Integer.parseInt(req.getParameter("itemid"));
ct.DeleteItem(itemid);
hs.setAttribute("cart",ct);
resp.getWriter().write("总价："+String.valueOf(ct.getPrice()));
}
gouwuche.gif
订单
OrderItem
public class CartItem {
private Book book;
private int number;
private float price;
public Book getBook() {
return book;
}
public void setBook(Book book) {
this.book = book;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public float getPrice() {
return number*book.getPrice();
}
public void setPrice(float price) {
this.price = price;
}
@Override
public String toString() {
return "CartItem{" +
"book=" + book +
", number=" + number +
", price=" + price +
'}';
}
public CartItem() {
}
public CartItem(Book book, int number, float price) {
this.book = book;
this.number = number;
this.price = price;
}
}
表示购物车每一项
Order
public class Order {
int id;
private Date date;
private float price;
private boolean state;
private int user_id;
private Set<OrderItem> so = new HashSet<>();
//设置一个 Set
}
生成订单
private void AddOrder(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
HttpSession hs = req.getSession();
//拿到用户id
int user_id = Integer.parseInt(req.getParameter("user_id"));
//从session中拿到购物车的数据
Cart ct = (Cart)hs.getAttribute("cart");
//拿到购物车中具体map数据
Map<Integer, CartItem> cartitems = ct.getMc();
//设置Set order
Set<OrderItem> so = new HashSet<>();
// Order order = new Order(0,new Date(),ct.getPrice(),false,user_id);
Order order = new Order();
order.setId(0);
for(int i:cartitems.keySet()){
CartItem ci = cartitems.get(i);
OrderItem ot = new OrderItem(0,ci.getBook().getId(),order.getId(),ci.getNumber(),ci.getPrice());
so.add(ot);
}
order.setSo(so);
order.setDate(new Date());
order.setPrice(ct.getPrice());
order.setState(false);
order.setUser_id(user_id);
//将order放入od
od.AddOrder(order);
List<Order> lo = od.FindUserOrder(user_id);
hs.setAttribute("orders", lo);
resp.sendRedirect("/FontMain/MyOrder.jsp");
}
