checkcartservlet.java

网上购书系统的完整代码

package org.myrose.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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 org.myrose.beans.Member;
import org.myrose.dao.MemberDAO;

public class CheckCartServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public CheckCartServlet() {
		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 {

		response.setContentType("text/html;charset=GBK");
		request.setCharacterEncoding("GBK");
		this.doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * 次方法用来检验购物车,数据合法,则转到 cart_checkout.jsp
	 * 
	 * @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=GBK");
		request.setCharacterEncoding("GBK");
		HttpSession session = request.getSession();
		if(session.getAttribute("cart")==null){
			request.setAttribute("bookcart", "null");
			request.getRequestDispatcher("index.aspx").forward(request, response);
			return ;
		}
		String username="";
		username=(String)session.getAttribute("username");
		MemberDAO dao = new MemberDAO();
		Member m = null;
		if(username != ""){
			try {
				m = dao.findMemberByNamePass(username, null);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}else{
			request.setAttribute("regist", "no");
			request.getRequestDispatcher("index.aspx").forward(request, response);
			session.removeAttribute(username);
			session.invalidate();
			return ;
		}
		if(m == null){
			request.setAttribute("regist", "no");
			request.getRequestDispatcher("index.aspx").forward(request, response);
			session.removeAttribute(username);
			session.invalidate();
			return ;
		}else{
			request.setAttribute("member", m);
			request.getRequestDispatcher("cart_checkout.jsp").forward(request, response);
		}
	}

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

}