intech java: create article exo

createArticleForm

package fr.intechinfo.s5.jee.servletJsp;

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

import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.HeuristicMixedException;
import javax.transaction.HeuristicRollbackException;
import javax.transaction.NotSupportedException;
import javax.transaction.RollbackException;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.UserTransaction;

import fr.intechinfo.s5.jee.jpa.Article;

/**
 * Servlet implementation class CreateArticleForm
 */
@WebServlet("/create-article-form")
public class CreateArticleForm extends HttpServlet {
	private static final long serialVersionUID = 1L;
  
	@PersistenceContext(unitName="BlogPU")
	EntityManager entityManager;
	
	@Resource
	private UserTransaction utx;
	  
    /**
     * @see HttpServlet#HttpServlet()
     */
    public CreateArticleForm() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		request.getRequestDispatcher("/createArticleForm.jsp")
		.forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		
		String title = request.getParameter("title");
		String content = request.getParameter("content");
		
	
		try {
			utx.begin();
		} catch (NotSupportedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SystemException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		Article article = new Article();
		article.setTitle(title);
		article.setContent(content);
		article.setCreatedOn(new Date());
		
		entityManager.persist(article);
		
		try {
			utx.commit();
		} catch (SecurityException | IllegalStateException | RollbackException
				| HeuristicMixedException | HeuristicRollbackException
				| SystemException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		response.sendRedirect("article-list");
	}

}