addtocart.java

使用servlet写的简单网上书店

package c;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.sql.DataSource;

import utils.BookUtil;
import entity.Book;
import entity.ShoppingCart;

public class AddToCart extends HttpServlet {
	private DataSource ds;

//	private Connection con;
	private ResultSet rs;

	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		ServletContext context = config.getServletContext();
		ds = (DataSource) context.getAttribute("DataSource");
	}

	protected void service(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession(false);
		String pageInfo = "../login.html";
		if(null==session){
		response.sendRedirect(pageInfo);
		}else{
		String str = (String) session.getAttribute("login");

		System.out.println("str" + str);
		if ("success".equals(str)) {

			this.addBookServlet(session, request);
			pageInfo = "BookList";

		} else {
			pageInfo = "../login.html";
		}
		response.sendRedirect(pageInfo);
		}
	}

	private void addBookServlet(HttpSession session, HttpServletRequest request) {

		ShoppingCart cart = (ShoppingCart) session.getAttribute("cart");
		
		if (null == cart) {
			cart = new ShoppingCart();
			String[] books = request.getParameterValues("books");
			this.addBookToCart(cart, books, session);
		} else {
			String[] books = request.getParameterValues("books");
			this.addBookToCart(cart, books, session);
		}
	}

	private void addBookToCart(ShoppingCart cart, String[] books,
			HttpSession session) {
		Connection con = null;
		try {
			con = ds.getConnection();
			
			BookUtil bookUtil=new BookUtil(con);
			bookUtil.getList(books,cart);
			
			session.setAttribute("cart", cart);
			
			con.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
			
	}
}