buybook.jsp

jsp学习 jsp编程白例源代码此部分是指文件夹名为第1～9章中的内容（如表1）

<%@ page contentType="text/html;charset=gb2312" %>
<%@ include file="incoming/common.jsp"%>
<%@ include file="incoming/check.jsp"%>
<%
		String isbn = new String(request.getParameter("isbn").trim().getBytes("ISO-8859-1"));
		String buynum = new String(request.getParameter("buynum").trim().getBytes("ISO-8859-1"));
		Vector buylist = (Vector)session.getValue("shopcar");
		int ismatch = 0;
		Book book = new Book(isbn, Integer.parseInt(buynum));
		if (buylist == null)		 
		{
			buylist = new Vector();
			buylist.addElement(book);
		}
		else
		{
			for(int i=0; i<buylist.size(); i++)
				{
					Book _book =(Book)buylist.elementAt(i);
					if(_book.getIsbn().equals(book.getIsbn()))
						{
							_book.setBuynum(_book.getBuynum()+book.getBuynum());
							buylist.setElementAt(_book,i);
							ismatch = 1;
						}
				}
		if(ismatch==0)
			buylist.addElement(book);
		}
		session.putValue("shopcar", buylist);
		response.sendRedirect("shopcar.jsp");
%>