car_servlet.java

网上书城 购物车 创建SESSION等 具体网上书城 类库

package com.wl.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Vector;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.wl.db.dao.BooksDAO;
import com.wl.db.dao.OrderDAO;
import com.wl.db.dao.OrderDetailDAO;
import com.wl.db.vo.Books;
import com.wl.db.vo.OrderDetail;

public class Car_Servlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public Car_Servlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=gb2312");
		request.setCharacterEncoding("gb2312");
		BooksDAO db=new BooksDAO();
		
		try{
			Vector v=new Vector();
			v=(Vector)request.getSession(true).getAttribute("v");
			System.out.println("haha");
			String action=request.getParameter("action");
			if(action.equals("sure_car")){
				float sum=Float.parseFloat(request.getParameter("sum"));
			for(int i=0;i<v.size();i++){
				Books book=new Books();
				book=(Books)v.elementAt(i);
				float allshopcost=book.getBook_num()*book.getBooks_price()*book.getBooks_discount()+sum;
				book.setAllshopcost(allshopcost);
				v.setElementAt(book, i);
				}
				request.getSession(true).setAttribute("v", v);
				RequestDispatcher rd=request.getRequestDispatcher("SureOrderInfo.jsp");
				rd.forward(request, response);
			}
			if(action.equals("add")){
				String bookid1=request.getParameter("bookID");
				String booknum1=request.getParameter("setNum");
				int bookid=Integer.parseInt(bookid1);
				int booknum=Integer.parseInt(booknum1);
				if(v==null){
					v=new Vector();
					Books book=new Books();
					book=db.showSelectedbooks1(bookid);
					book.setBook_num(booknum);
					v.addElement(book);
					request.getSession(true).setAttribute("v", v);
					RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
					rd.forward(request, response);
				}else{
					int flag=0;
					for(int i=0;i<v.size();i++){
						Books book=(Books)v.elementAt(i);
						if(book.getBooks_id()==bookid){
							flag=1;
							int num=booknum+book.getBook_num();
							book.setBook_num(num);
							v.setElementAt(book, i);
							request.getSession(true).setAttribute("v", v);
							RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
							rd.forward(request, response);
						}
					}
					if(flag==0){
						Books book=new Books();
						book=db.showSelectedbooks1(bookid);
						book.setBook_num(booknum);
						v.addElement(book);
						request.getSession(true).setAttribute("v", v);
						RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
						rd.forward(request, response);
					}
				}
			}
			if(action.equals("delete")){
				int index=Integer.parseInt(request.getParameter("delbookid"));
				v.removeElementAt(index);
				request.getSession(true).setAttribute("v", v);
				RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
				rd.forward(request, response);
			}
			if(action.equals("change")){
				System.out.println("xixi");
				int bookid=Integer.parseInt(request.getParameter("changeid"));
				int booknum=Integer.parseInt(request.getParameter("num"));
				for(int i=0;i<v.size();i++){
					if(bookid==i){
						Books book=(Books)v.elementAt(i);
						book.setBook_num(booknum);
						v.setElementAt(book, i);
					}
				}
				request.getSession(true).setAttribute("v", v);
				RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
				rd.forward(request, response);
			}
			if(action.equals("clean")){
				v.removeAllElements();
				request.getSession(true).setAttribute("v", v);
				RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
				rd.forward(request, response);
			}
			if(action.equals("sure_car")){
				OrderDAO orderdao=new OrderDAO();
				OrderDetailDAO orderdtail=new OrderDetailDAO();
				String orderid=request.getParameter("orderid");
				Vector v1=new Vector();
				v1=(Vector)request.getSession().getAttribute("");
				for(int i=0;i<v1.size();i++){
					OrderDetail orderdatail=new OrderDetail();
					orderdatail=(OrderDetail)v1.elementAt(i);
					orderdtail.add_orderdetail(orderdatail);
				}
				request.getSession(true).invalidate();
				RequestDispatcher rd=request.getRequestDispatcher("ShowBookCar.jsp");
				rd.forward(request, response);
			}
			
		}catch(Exception ex){
			ex.printStackTrace();
		}
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}