网上购物系统,相信看后会有很大收获,用java,jsp,servlet编写

				package shop;
				
				import java.util.*;
				import java.sql.*;
				import test.bo.*;
				import test.models.*;
				import javax.servlet.*;
				import javax.servlet.http.*;
				import javax.servlet.jsp.*;
				import org.apache.jasper.runtime.*;
				
				
				public class clearall_0002ejsp_jsp extends HttpJspBase {
				
				    // begin [file="/shop/clearall.jsp";from=(3,0);to=(3,66)]
				    // end
				
				    static {
				    }
				    public clearall_0002ejsp_jsp( ) {
				    }
				
				    private static boolean _jspx_inited = false;
				
				    public final void _jspx_init() throws org.apache.jasper.runtime.JspException {
				    }
				
				    public void _jspService(HttpServletRequest request, HttpServletResponse  response)
				        throws java.io.IOException, ServletException {
				
				        JspFactory _jspxFactory = null;
				        PageContext pageContext = null;
				        HttpSession session = null;
				        ServletContext application = null;
				        ServletConfig config = null;
				        JspWriter out = null;
				        Object page = this;
				        String  _value = null;
				        try {
				
				            if (_jspx_inited == false) {
				                synchronized (this) {
				                    if (_jspx_inited == false) {
				                        _jspx_init();
				                        _jspx_inited = true;
				                    }
				                }
				            }
				            _jspxFactory = JspFactory.getDefaultFactory();
				            response.setContentType("text/html; charset=gb2312");
				            pageContext = _jspxFactory.getPageContext(this, request, response,
				            			"../error.jsp", true, 8192, true);
				
				            application = pageContext.getServletContext();
				            config = pageContext.getServletConfig();
				            session = pageContext.getSession();
				            out = pageContext.getOut();
				
				            // HTML // begin [file="/shop/clearall.jsp";from=(0,92);to=(1,0)]
				                out.write("\r\n");
				
				            // end
				            // HTML // begin [file="/shop/clearall.jsp";from=(1,42);to=(2,0)]
				                out.write("\r\n");
				
				            // end
				            // HTML // begin [file="/shop/clearall.jsp";from=(2,43);to=(3,0)]
				                out.write("\r\n");
				
				            // end
				            // begin [file="/shop/clearall.jsp";from=(3,0);to=(3,66)]
				                test.models.Cart cart = null;
				                boolean _jspx_specialcart  = false;
				                 synchronized (session) {
				                    cart= (test.models.Cart)
				                    pageContext.getAttribute("cart",PageContext.SESSION_SCOPE);
				                    if ( cart == null ) {
				                        _jspx_specialcart = true;
				                        try {
				                            cart = (test.models.Cart) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "test.models.Cart");
				                        } catch (ClassNotFoundException exc) {
				                             throw new InstantiationException(exc.getMessage());
				                        } catch (Exception exc) {
				                             throw new ServletException (" Cannot create bean of class "+"test.models.Cart", exc);
				                        }
				                        pageContext.setAttribute("cart", cart, PageContext.SESSION_SCOPE);
				                    }
				                 } 
				                if(_jspx_specialcart == true) {
				            // end
				            // begin [file="/shop/clearall.jsp";from=(3,0);to=(3,66)]
				                }
				            // end
				            // HTML // begin [file="/shop/clearall.jsp";from=(3,66);to=(5,0)]
				                out.write("\r\n\r\n");
				
				            // end
				            // begin [file="/shop/clearall.jsp";from=(5,2);to=(8,0)]
				                
				                  cart.clear();
				                  response.sendRedirect("viewCategory.jsp");
				            // end
				            // HTML // begin [file="/shop/clearall.jsp";from=(8,2);to=(9,0)]
				                out.write("\r\n");
				
				            // end
				
				        } catch (Throwable t) {
				            if (out != null && out.getBufferSize() != 0)
				                out.clearBuffer();
				            if (pageContext != null) pageContext.handlePageException(t);
				        } finally {
				            if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
				        }
				    }
				}