How to use cookie to save browsing history commodity ?

how to write a java using cookie history to retain six recent history code ?
I will keep the last six commodity browsing history, will be read and displayed on the page, ask how to write ?

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cookie operation
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write in, when read out each landing
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with stringbuffer to record the user writes viewed item id cookie , gets a cookie browse again , remove the id, id you think why there are ok
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upstairs , the goods ID stored cookie, such as the " 1-2-3-4-5-6 " stored this way .
When viewing a product when it reads the cookie, get its string to determine whether the id in which posts a part of the code .

  /**
  	 * 创建id字符串,形如"1-2-3-4-5-6"
  	 * @param request
  	 * @param id 商品Id
  	 * @return
  	 */
  private String buildViewHistory(HttpServletRequest request, Long id) {
  
  		String cookieValue = WebUtil.getCookieByName(request,
  				"productViewHistory");//从cookie读取，此处进行了封装，对该方法关系不大
  		LinkedList<Long> linkedList = new LinkedList<Long>();
  		if (cookieValue != null && !"".equals(cookieValue)) {
  			String[] entityIds = cookieValue.split("-");
  
  			for (int i = 0; i < entityIds.length; i++) {
  				linkedList.add(Long.valueOf(entityIds[i]));
  			}
  			// 该商品若在浏览历史里，把该商品排在历史记录首处
  			if (linkedList.contains(id)) {
  				linkedList.remove(id);
  			}
  			// 用户浏览的商品超过5个，保留最近浏览的商品
  			if (linkedList.size() >= 5) {
  				linkedList.remove();
  			}
  
  		}
  		linkedList.offer(id);
  		StringBuilder sb = new StringBuilder();
  		for (Long prodcutID : linkedList) {
  			sb.append(prodcutID).append("-");
  		}
  		if (linkedList.size() != 1) {
  			sb.deleteCharAt(sb.length() - 1);
  		}
  		return sb.toString();
  
  	}

With this string ajax request at the front desk , it is easy to get checked items .
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landlord this problem solved? I also do this seeking paste code
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elaborate brother can no longer beg ah