shoppingcartcontroller.java

JDBC数据库高级编程源代码

package jdbcbook.ch05;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.util.Vector;

// 购物车的Servlet控制器
public class ShoppingCartController extends HttpServlet
{
	public void doPost( HttpServletRequest request,
						HttpServletResponse response )
			throws ServletException, IOException
	{
		Vector books;

		HttpSession session = request.getSession();

		synchronized( session )
		{
			// 获得Session中保存的图书名称
			books = (Vector)session.getValue( "books" );

			// 如果没有保存，那么进行初始化
			if( books == null )
			{
				books = new Vector();
				session.putValue( "books", books );
			}

			// 业务处理
			ShoppingCartBean.processRequest( request, books );

			// 将数据传递给页面
			request.setAttribute( "books", books );

			// 业务处理完毕，控制器将指挥权交给显示页面
			RequestDispatcher dispatcher = request.getRequestDispatcher( "purchaseview.jsp" );
			dispatcher.forward( request, response );
		}
	}
}