String分离的应用web开发用于记录购物数

在jsp上

<input type="hidden" name="merchandise">

 

在写一个javascript

 

<script type="text/javascript">
	<!-- 
		function _buy(name){
			var _merchandise=document.rollForm.merchandise.value;
			if(_merchandise==null){
				document.rollForm.merchandise.value=name;
			}else{
				document.rollForm.merchandise.value=_merchandise+"\t"+name;
			}
		}
	//-->
	</script>

  
  

还有一个用于提交的文本

<input type="hidden" name="merchandise">

private void _shop_car(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		
		String merchandise=request.getParameter("merchandise");
		List<Integer> merchandises=(List)request.getSession().getAttribute("merchandises");

		if(merchandises!=null){
			if(merchandise!=null){
				String[] m=merchandise.split("\t");
				for(String s:m){
					if(!s.equals(""))
						s=s.trim();
						merchandises.add(Integer.parseInt(s));
				}
			}
		}else{
			merchandises=new ArrayList<Integer>();
			request.getSession().setAttribute("merchandises", merchandises);
		}
		request.getSession().setAttribute("merchandises", merchandises);
		
		merchandises=(List)request.getSession().getAttribute("merchandises");
		List<Integer> list=new ArrayList<Integer>();
		List<BookBean> _merchandises=new ArrayList<BookBean>();
		/**
		 * 将session 中的session  copy出来
		 */
		for(Integer i:merchandises){
			list.add(i);
		}
		BookDTO bookDto=new BookDTO();
		for(int i=0;i<list.size();i++){
			BookBean book=bookDto.findById(list.get(i));
			int count=1;
			for(int j=1;j<list.size();j++){
				if(list.get(i)==list.get(j)){
					list.remove(j);
					count++;
				}
			}
			book.setCount(count);
			_merchandises.add(book);
		}
		System.out.println();
		request.setAttribute("list", _merchandises);
		request.getRequestDispatcher("/view/user/shop_car.jsp").forward(request, response);