1.購物車功能
//用戶最近浏覽商品記錄
把商品的id作為參數來傳遞，在另一個頁面來接收這個參數,然後是創建cookie把這個商品id給保存下來。然後就是頁面就會自動保存這個cookie。
//顯示最近浏覽商品
Cookie cookie = new Cookie("proHistory", getHistory);
response.addCookie(cookie);
String myid = cookie.getValue();
//將一個數化為一個List對象，這個方法會返回一個ArrayList類型的對象,是把字符串從-號開始分劈
List mylist = Arrays.asList(myid.split("_"));
Product pro = null;
List<Product> list = new ArrayList<Product>();
//遍歷list對象
for (Object item : mylist) {
CommodityDaoImpl_Dong cimpl = new CommodityDaoImpl_Dong();
try {
pro = cimpl.getById(Integer.parseInt(item.toString()));//一級商品id
list.add(pro);
request.getSession().setAttribute("slist", list);
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
request.getRequestDispatcher("/product-view.jsp").forward(request, response);
}
//顯示最近浏覽商品
@SuppressWarnings("unchecked")
private String getHistory(HttpServletRequest request, String id){
//獲取用戶所有攜帶的cookie
//可能情況
//第一次訪問:proHistory=null 1 proHistory=1
//非第一次:proHistory=3_2_5 1 proHistory=1_3_2
//非第一次:proHistory=3_1_5 1 proHistory=1_3_5
//非第一次:proHistory=3_2 1 proHistory=1_3_2
//拆解出cookies集合
Cookie[] cookies = request.getCookies();
//浏覽過的商品形成的大字符串
String proHistory=null;
for (int i = 0; cookies!=null&&i < cookies.length; i++) {
if(cookies[i].getName().equals("proHistory")){
proHistory=cookies[i].getValue();
break;
}
}
if(proHistory==null){
return id;
}
//根據_分割數據
//在java中 \代表轉義字符 \n \t 等，而 \\ 代表一個反斜槓 而.代表一個元字符
//要表示一個.就需要用 要用\.
//所以"\\." 在實際編譯中 就代表 .
List mylist = Arrays.asList(proHistory.split("\\_"));
LinkedList<String> list = new LinkedList<String>();
list.addAll(mylist);
if(list.contains(id)){//集合中含有該商品
list.remove(id);
list.addFirst(id);
} else {
if(list.size()>=3){
list.removeLast();
list.addFirst(id);
} else {
list.addFirst(id);
}
}
StringBuffer sb = new StringBuffer();
for (String item : list) {
sb.append(item+"_");
}
return sb.deleteCharAt(sb.length()-1).toString();
}
css
<div class="spacer"></div>
<div class="last-view">
<h2>最近浏覽</h2>
<dl class="clearfix">
<c:forEach items="${slist}" var="item">
<dt><img src="<%=path %>/images/product/${item.fileName}" /></dt>
<dd><a href="<%=path %>/servlet/IndexServlet?opr=blist&id=${item.id}" target="_self">${item.name}</a>
<a href="<%=path %>/servlet/IndexServlet?opr=blist&id=${item.id}"></a></dd>
<dt> </dt>
<dd> </dd>
</c:forEach>
</dl>
</div>
</div>
//將購物車中的商品移除
//將商品移除出購物車
if(opr!=null&&opr.equals("deleteShop")){
String shid = request.getParameter("shid");
Cart cart=(Cart)request.getSession().getAttribute("cart");
cart.getMap().remove(shid);
request.getSession().setAttribute("cart", cart);
request.getRequestDispatcher("/shopping.jsp").forward(request, response);
}
//將商品加入到購物車
if(opr!=null&&opr.equals("plists")){
User userid=(User)request.getSession().getAttribute("user");//獲取用戶名對象
if (userid!=null) {//用戶登錄不等於空
// String cartid = request.getParameter("cartid");
String psid=request.getParameter("psid");
//System.out.println("qqqqq"+psid);
List<Product> plist = shop.getShoppingById(Integer.parseInt(psid));//商品id
//將商品加入到購物車中
Cart cart=(Cart)request.getSession().getAttribute("cart");
if (cart==null) {
cart =new Cart();
}
cart.Add(plist.get(0));
request.getSession().setAttribute("cart", cart);
//request.getRequestDispatcher("/shopping.jsp").forward(request, response);
}else{
request.getRequestDispatcher("/login.jsp").forward(request, response);
}
css
<div class="wrap">
<div id="shopping">
<form action='<%=path %>/servlet/IndexServlet?opr=check' method="post">
<table>
<tr>
<td>商品名稱</td>
<td>商品價格</td>
<td>購買數量</td>
<td>操作</td>
</tr>
<c:forEach items="${cart.map}" var="item">
<tr id="product_id_0">
<td class="thumb"><img src="<%=path %>/images/product/${item.value.product.fileName}" />
<a href="<%=path %>/servlet/IndexServlet?opr=plists&psid=${item.value.product.id}">${item.value.product.name}</a></td>
<td class="price" id="price_id_0">
<span class="price">￥${item.value.product.price}</span>
<input type="hidden" value="${item.value.product.price }" />
</td>
<td class="number">
<span name="del" >-</span>
<input id="number_id_0" type="text" name="number" class="text_box" value="${item.value.quantity}" />
<span name="add" >+</span>
</td>
<td class="delete"><a href="<%=path %>/servlet/IndexServlet?opr=deleteShop&shid=${item.value.product.id}">刪除</a></td>
</tr>
</c:forEach>
</table>
<div class="total"><span id="total">總計：￥0</span></div>
<div class="button"><input type="submit" value="" /></div>
</form>
</div>
//用戶結算購物車商品
if(opr!=null&&opr.equals("check")){
//獲取用戶
User uid=(User) request.getSession().getAttribute("user");
if( uid!=null){ //判定用戶不為空
String address = dao.getAddressByUserId(uid.getUserId());// 根據用戶id獲取收貨地址
request.getSession().setAttribute("address", address);
request.getRequestDispatcher("/address.jsp").forward(request, response);
// Cart cart=(Cart)request.getSession().getAttribute("cart");
}else {
request.getRequestDispatcher("/login.jsp").forward(request, response);
}
}
if(opr!=null&&opr.equals("Order")){
Cart cart = (Cart) request.getSession().getAttribute("cart");
// 獲取用戶名
User uid=(User) request.getSession().getAttribute("user");
//String user_id=uid.getUserId();
// 獲取發貨的地址
String address = request.getParameter("address");
address=new String(address.getBytes("iso-8859-1"),"utf-8");
String number=request.getParameter("number");
User user = new User();
// 給用戶id賦值
user.setUserId(uid.getUserId());
// 給用戶名賦值
user.setUserName(dao.getUsernameByUid(user.getUserId()));
//user.setUserName(uid.getUserName());
// 給收貨地址賦值
user.setAddress(address);
CartItem cartitm=new CartItem();
cartitm.setQuantity(Integer.parseInt(number));
boolean falg = daoorder.add(cart, user);
if (falg) {
request.getRequestDispatcher("/shopping-result.jsp").forward(request, response);
request.getSession().removeAttribute("cart");//結算購物車商品後清除該商品
} else {
request.getRequestDispatcher("/address.jsp").forward(request, response);
}
}
功能寫的不怎麼樣，如有不足之處，請多多指教！
