利用JAVA-COOKIE做的购物车DEMO

这几天写了下JAVA写的COOKIE的DEMO。可能代码有点长，希望对需要的朋友有帮助。
框架：SPRINGMVC

1、首先是购物车工具类 get set方法略

/**
 * 购物车工具类
 */
public class Cart {
	private static final long serialVersionUID = 1L;
	private static Logger logger = Logger.getLogger(Cart.class);
	private List<CartItem> items = new ArrayList<CartItem>();
	private HttpServletRequest request;
	private double sumamount;//总计金额
	private int sumnumb;//总计数量
	
	public Cart() {
	}
	
	//增加
	public void addItem(CartItem item) {
		if (items.contains(item)) {// 如果购物项已经存在于购物车,累加其购买数量
			for (CartItem cItem : items) {
				if (cItem.equals(item)) {
					cItem.setAmount(cItem.getAmount() + item.getAmount());
					double price = cItem.getSpace().getPrice();
					double totalamount = DataUtil.mul(price, cItem.getAmount(),1);
					cItem.setTotalamount(totalamount);
					break;
				}
			}
		} else {
			double price = item.getSpace().getPrice();
			double totalamount = DataUtil.mul(price, item.getAmount(),1);
			item.setTotalamount(totalamount);
			items.add(item);
		}
		//计算总价
		sumamount = this.getsumamount();
		sumnumb = this.getsumnumb();
	}
	
	//删除
	public void deleteItem(CartItem item) {
		if (items.contains(item)){
			items.remove(item);
		}
		//计算总价
		sumamount = this.getsumamount();
		sumnumb = this.getsumnumb();
	}
	
	//总价
	public double getsumamount(){
		double result = 0.0d;
		for(CartItem cItem: items){
			result = DataUtil.sum(result, cItem.getTotalamount());
		}
		return result;
	}
	
	//总数量
	public int getsumnumb(){
		int result = 0;
		for(CartItem cItem: items){
			result += cItem.getAmount();
		}
		return result;
	}
	
	/**
	 * 序列化
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String serialize() throws UnsupportedEncodingException {
		StringBuilder buffer = new StringBuilder();
		for(int i = 0;i<items.size();i++){
			String item = items.get(i).toString();			
			buffer.append(item);
			buffer.append(";");
		}
		if (buffer.length() > 0)
			buffer.deleteCharAt(buffer.length() - 1);
		return buffer.toString();
	}
	
	/**
	 * 加载购物车
	 * @param ticketService
	 * @param content
	 * @throws UnsupportedEncodingException
	 */
	public void load(TicketService ticketService,String content) throws UnsupportedEncodingException {
		items.clear();
		if (content == null || "".equals(content))
			return;
		else {
			try {
				String[] itemsArry = content.split(";");
				int sumnumb = 0;//总数量
				double sumamount = 0.0;//总计
				for (int i = 0; i < itemsArry.length; i++) {
					String array = itemsArry[i];
					String[] strarray = array.split(",");
					int number = Integer.parseInt(strarray[0].split(":")[1]);
					int id = Integer.parseInt(strarray[1].split(":")[1]);
					//double price = Double.parseDouble(strarray[2].split(":")[1]);
					CartItem item = new CartItem();
					item.setAmount(number);
					Space space = ticketService.findBySpaceId(id);
					Ticket ticket = ticketService.findById(space.getTicketNo());
					space.setTicketName(ticket.getTicketName());
				
					item.setSpace(space);
					item.setTotalamount(number, space.getPrice());//算小计
					items.add(item);
					
					sumnumb += number;
					sumamount = DataUtil.sum(sumamount, item.getTotalamount());
				}
				this.setSumamount(sumamount);
				
			} catch (Exception e) {
				// TODO: handle exception
				return;
			}
		}
	}

	//删除所有
	public void deleteAll() {
		items.clear();
	}

}

2、购物车其中的一项（工具类）

/**
 * 购物车-一项
 * @author shiaj
 * Dec,2012
 */
@SuppressWarnings("serial")
public class CartItem implements java.io.Serializable{
	private int amount = 1;//数量
	private Space space;//商品实体类
	private double totalamount;//小计

	public CartItem(){}
	
	public CartItem(int amount,Space space) {
		this.amount = amount;
		this.space = space;
	}
	
	/**
	 * 小计
	 * @param amount
	 * @param price
	 */
	public void setTotalamount(int amount,double price) {
		this.totalamount = DataUtil.mul(amount, price, 2);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((space == null) ? 0 : space.hashCode());
		return result;
	}
	
	@Override
	 	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		CartItem other = (CartItem) obj;
		if(this.space.getSpaceNo().equals(other.getSpace().getSpaceNo())){
			return true;
		}
		return false;
	}
	
	public String toString(){
		StringBuffer string = new StringBuffer();
		string.append("amount:" + amount + ",id:" + this.space.getSpaceNo() + 
				",price:" + this.space.getPrice());
		return string.toString();
	}

}

3、购物车的使用--ACTION类

@Controller
public class OrderAct extends SessionCart{
	@Autowired
	private TicketService ticketService;
	
	public static final String CART_ID = "cookie.cart.id";
	/**
	 * 查看购物车
	 * @param request
	 * @param model
	 * @return
	 */
	@RequestMapping(value = "/shoppingcart.jhtml", method = RequestMethod.GET)
	public String shoppingcart(HttpServletRequest request,ModelMap model){
		String flag = this.getCartFlag(request);
		if(flag == null || !flag.equals("havaReadCookie")){//COOKIE转SESSION
			//读取COOKIE
			Cart cart = this.getCart(request);
			this.setShoppingCartSession(request, cart);
		}
		return "WEB-INF/t/cms/www/red/index/shoppingcart.html";
	}
	
	/**
	 * 加入购物车
	 * @param request
	 * @param response
	 * @param test
	 * @throws Exception 
	 */
	@RequestMapping(value = "/addItem.jhtml")
	public void addItem(HttpServletRequest request,
			HttpServletResponse response,Space space,Integer amount) throws Exception {
		System.out.println(space.getSpaceNo());
		String flag = this.getCartFlag(request);
		Cart cart = new Cart();
		if(flag == null || !flag.equals("havaReadCookie")){//COOKIE转SESSION
			//读取COOKIE
			cart = this.getCart(request);
			
		} else{//若SESSION存在 则直接读取SESSION
			cart = this.getShoppingCartSession(request);
		}
		
		Space newspace = this.ticketService.findBySpaceId(space.getSpaceNo());
		Ticket ticket = this.ticketService.findById(newspace.getTicketNo());
		newspace.setTicketName(ticket.getTicketName());
		CartItem item = new CartItem(amount,newspace);
		cart.addItem(item);
		
		//放入购物车
		saveToCookie(response, cart);
		
		this.setCartFlag(request, "havaReadCookie");
		this.setShoppingCartSession(request, cart);
		
		String msg;
		msg = "{'success':false}";
		ResponseUtils.renderJson(response, msg);
	}
	
	/**
	 * 删除某一项
	 * @param request
	 * @param response
	 * @param test
	 * @throws Exception 
	 */
	@RequestMapping(value = "/delItem.jhtml")
	public void Item(HttpServletRequest request,
			HttpServletResponse response,Space space,Integer amount) throws Exception {
		String flag = this.getCartFlag(request);
		Cart cart = new Cart();
		if(flag == null || !flag.equals("havaReadCookie")){//COOKIE转SESSION
			//读取COOKIE
			cart = this.getCart(request);
			
		} else{//若SESSION存在 则直接读取SESSION
			cart = this.getShoppingCartSession(request);
		}
		
		Space newtest = this.ticketService.findBySpaceId(space.getSpaceNo());
		CartItem item = new CartItem(amount,newtest);
		cart.deleteItem(item);
		
		//放入购物车
		saveToCookie(response, cart);
		
		this.setCartFlag(request, "havaReadCookie");
		this.setShoppingCartSession(request, cart);
		
		String msg;
		msg = "{'success':false}";
		ResponseUtils.renderJson(response, msg);
	}
	
	/**
	 * 保存cookie
	 */
	private void saveToCookie(HttpServletResponse response, Cart cart)
			throws Exception {
		CookieUtils.addCookie(response, CART_ID + "01", cart.serialize());
	}
	
	/**
	 * 购物车的初始化
	 * 
	 * @return CartService
	 */
	private Cart getCart(HttpServletRequest request) {
		Cart cs = null;
		try {
			String cartStr = "";
			cartStr = CookieUtils.findCookie(request, CART_ID + "01");
			cs = new Cart();
			if (cartStr != null && !"".equals(cartStr)) {
				cs.load(ticketService,cartStr);
			}
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return cs;
	}
}

附、COOKIE工具类

public class CookieUtils {
	public static final int MAX_AGE = 60 * 60 * 24 * 7;

	/**
	 * 添加COOKIE
	 * @param response
	 * @param key
	 * @param value
	 * @throws UnsupportedEncodingException
	 */
	public static void addCookie(HttpServletResponse response, String key,
			String value) throws UnsupportedEncodingException {
		value = URLEncoder.encode(value, "utf-8");
		Cookie cookie = new Cookie(key, value);
		cookie.setMaxAge(MAX_AGE);
		cookie.setPath("/");
		response.addCookie(cookie);
	}

	/**
	 * 删除COOKIE
	 * @param response
	 * @param key
	 */
	public static void deleteCookie(HttpServletResponse response, String key) {
		Cookie cookie = new Cookie(key, "");
		cookie.setMaxAge(0);
		cookie.setPath("/");
		response.addCookie(cookie);
	}

	/**
	 * 查找COOKIE
	 * @param request
	 * @param key
	 * @return	String
	 * @throws UnsupportedEncodingException
	 */
	public static String findCookie(HttpServletRequest request, String key)
			throws UnsupportedEncodingException {	
		Cookie[] cookies = request.getCookies();
		if (cookies != null) {
			for (int i = 0; i < cookies.length; i++) {
				if (key.equals(cookies[i].getName())) {
					return URLDecoder.decode(cookies[i].getValue(), "utf-8");
				}
			}
		}
		return null;
	}
		
}