📄 eventmanagerservlet.java

📁 hibernate 开源框架的代码 jar包希望大家能喜欢
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package org.hibernate.tutorial.web;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.hibernate.tutorial.domain.Event;import org.hibernate.tutorial.util.HibernateUtil;public class EventManagerServlet extends HttpServlet {    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        SimpleDateFormat dateFormatter = new SimpleDateFormat("dd.MM.yyyy");        try {            // Begin unit of work            HibernateUtil.getSessionFactory()                    .getCurrentSession().beginTransaction();            // Write HTML header            PrintWriter out = response.getWriter();            out.println("<html><head><title>Event Manager</title></head><body>");            // Handle actions            if ( "store".equals(request.getParameter("action")) ) {                String eventTitle = request.getParameter("eventTitle");                String eventDate = request.getParameter("eventDate");                if ( "".equals(eventTitle) || "".equals(eventDate) ) {                    out.println("<b><i>Please enter event title and date.</i></b>");                } else {                    createAndStoreEvent(eventTitle, dateFormatter.parse(eventDate));                    out.println("<b><i>Added event.</i></b>");                }            }            // Print page            printEventForm(out);            listEvents(out, dateFormatter);            // Write HTML footer            out.println("</body></html>");            out.flush();            out.close();            // End unit of work            HibernateUtil.getSessionFactory()                    .getCurrentSession().getTransaction().commit();        } catch (Exception ex) {            HibernateUtil.getSessionFactory()                    .getCurrentSession().getTransaction().rollback();            throw new ServletException(ex);        }    }    private void printEventForm(PrintWriter out) {        out.println("<h2>Add new event:</h2>");        out.println("<form>");        out.println("Title: <input name='eventTitle' length='50'/><br/>");        out.println("Date (e.g. 24.12.2009): <input name='eventDate' length='10'/><br/>");        out.println("<input type='submit' name='action' value='store'/>");        out.println("</form>");    }    private void listEvents(PrintWriter out, SimpleDateFormat dateFormatter) {        List result = HibernateUtil.getSessionFactory()                        .getCurrentSession().createCriteria(Event.class).list();        if (result.size() > 0) {            out.println("<h2>Events in database:</h2>");            out.println("<table border='1'>");            out.println("<tr>");            out.println("<th>Event title</th>");            out.println("<th>Event date</th>");            out.println("</tr>");            for (Iterator it = result.iterator(); it.hasNext();) {                Event event = (Event) it.next();                out.println("<tr>");                out.println("<td>" + event.getTitle() + "</td>");                out.println("<td>" + dateFormatter.format(event.getDate()) + "</td>");                out.println("</tr>");            }            out.println("</table>");        }    }    protected void createAndStoreEvent(String title, Date theDate) {        Event theEvent = new Event();        theEvent.setTitle(title);        theEvent.setDate(theDate);        HibernateUtil.getSessionFactory()                        .getCurrentSession().save(theEvent);    }}
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