caraction.java

利用jsp中的技术

import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

/**
 * @author Chao Wu
 * 
 * Description:
 * <p>
 * 
 * Copyright:
 * <p>
 */
public class CarAction extends Action {

	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws IOException, ServletException {

		CarForm carForm = (CarForm) form;

		String mode = request.getParameter("mode");

		if ("add".equalsIgnoreCase(mode)) {
			return executeAddAction(mapping, carForm, request, response);
		} else if ("view".equalsIgnoreCase(mode)) {
			return executeViewAction(mapping, carForm, request, response);
		} else if ("done".equalsIgnoreCase(mode)) {
			return executeDoneAction(mapping, carForm, request, response);
		} else 
		{
			return executeManageAction(mapping, carForm, request, response);
		}

	}

	private ActionForward executeAddAction(ActionMapping mapping, CarForm form,
			HttpServletRequest request, HttpServletResponse response) {
		
		CarForm carForm = (CarForm) form;		
		String hid = request.getParameter("hid");
		SessionFactory sf = new Configuration().configure()
				.buildSessionFactory();
		Session session = sf.openSession();
		Transaction tx = session.beginTransaction();
		String sqlQuery = "select c from Car c where c.name='" + hid + "'";
		Query lQuery = session.createQuery(sqlQuery);
		ArrayList carList = (ArrayList) lQuery.list();
		Car car = (Car) carList.get(0);
		tx.commit();
		session.close();		
		HttpSession httpSession = request.getSession();
		ArrayList buylist = (ArrayList) httpSession.getAttribute("buylist");
		Double totalprice = (Double)httpSession.getAttribute("totalprice");
		buylist.add(car);
		httpSession.setAttribute("buylist", buylist);
		httpSession.setAttribute("totalprice",Double.valueOf(totalprice.doubleValue()+car.getPrice()));
		return executeManageAction(mapping, carForm, request, response);
	}

	private ActionForward executeViewAction(ActionMapping mapping,
			CarForm form, HttpServletRequest request,
			HttpServletResponse response) {
		CarForm carForm = (CarForm) form;
		String hid = request.getParameter("hid");
		SessionFactory sf = new Configuration().configure()
				.buildSessionFactory();
		Session session = sf.openSession();
		Transaction tx = session.beginTransaction();
		String sqlQuery = "select c from Car c where c.name='" + hid + "'";
		Query lQuery = session.createQuery(sqlQuery);
		ArrayList carList = (ArrayList) lQuery.list();
		Car car = (Car) carList.get(0);
		tx.commit();
		session.close();
		carForm.setViewCar(car);
		return mapping.findForward("viewcar");
	}
	
	private ActionForward executeDoneAction(ActionMapping mapping,
			CarForm form, HttpServletRequest request,
			HttpServletResponse response) {

		CarForm carForm = (CarForm) form;

		HttpSession httpSession = request.getSession();
		
		Double totalprice = (Double)httpSession.getAttribute("totalprice");
		carForm.setTotalPrice(String.valueOf(totalprice));
		return mapping.findForward("done");
	}
	private ActionForward executeManageAction(ActionMapping mapping,
			CarForm form, HttpServletRequest request,
			HttpServletResponse response) {

		CarForm carForm = (CarForm) form;

		ArrayList carList = new ArrayList();

		SessionFactory sf = new Configuration().configure()
				.buildSessionFactory();
		Session session = sf.openSession();
		Transaction tx = session.beginTransaction();
		String sqlQuery = "from Car";
		Query lQuery = session.createQuery(sqlQuery);
		carList = (ArrayList) lQuery.list();
		tx.commit();
		session.close();
		HttpSession httpSession = request.getSession();
		ArrayList buylist = (ArrayList) httpSession.getAttribute("buylist");
		carForm.setBuyList(buylist);
		carForm.setCarList(carList);
		return mapping.findForward("cars");
	}

}