Package guestbook

Source Code of guestbook.SignGuestbookServlet

package guestbook;

import java.io.IOException;
import java.util.Date;
import java.util.logging.Logger;

import javax.persistence.EntityManager;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.users.User;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;



@SuppressWarnings("serial")
public class SignGuestbookServlet extends HttpServlet {
  private static final Logger log = Logger.getLogger(SignGuestbookServlet.class.getName());
 
  public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException{
    UserService userService = UserServiceFactory.getUserService();
    User user = userService.getCurrentUser();
   
    String content = req.getParameter("content");
   
    Date date = new Date();
   
    Greeting greeting = new Greeting(user, content, date);
   
    EntityManager em = EMF.get().createEntityManager();
   
    try {
     
      em.getTransaction().begin();
      em.persist(greeting);
      em.getTransaction().commit();

      if (content == null) {
        content = "(No greeting)";
      }
     
      if (user != null) {
        log.info("Greeting posted by user " + user.getNickname() + " : " + content);
      } else {
        log.info("Greeting posted anonymously: " + content);
      }
     
    } finally {
      em.close();
    }
   
    resp.sendRedirect("/guestbook.jsp");
  }
}
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