JAX-RS resource like a servlet

package org.paulvargas.blog.rs;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.AbstractMap.SimpleEntry;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ejb.EJB;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;

import org.omnifaces.filter.CacheControlFilter;
import org.paulvargas.blog.ejb.ArchiveEJB;
import org.paulvargas.blog.ejb.CommentEJB;
import org.paulvargas.blog.ejb.PostEJB;
import org.paulvargas.blog.model.Archive;
import org.paulvargas.blog.model.Comment;
import org.paulvargas.blog.model.Post;
import org.paulvargas.tools.util.ClassLoaderUtil;

@Path("blog")
@Stateless
public class BlogResource {

	private static final Logger LOG = Logger.getLogger(BlogResource.class.getName());

	private static void copy(InputStream source, OutputStream target) throws IOException {
		byte[] buffer = new byte[8192];
		for (int n; (n = source.read(buffer)) > 0;) {
			target.write(buffer, 0, n);
		}
	}

	@EJB
	private PostEJB postEJB;

	@EJB
	private CommentEJB commentEJB;

	@EJB
	private ArchiveEJB archiveEJB;

	@GET
	public void getHome(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context) {
		try {
			request.setAttribute("posts", postEJB.getPosts());
			request.getRequestDispatcher("/WEB-INF/pages/blog/home.jsp").forward(request, response);
		} catch (ServletException | IOException e) {
			LOG.log(Level.SEVERE, "There was an error getting the posts.", e);
		}
	}

	@GET
	@Path("post/{id : \\d+}")
	@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
	public void getPost(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context, @PathParam("id") int id) {
		try {
			SimpleEntry<Post, List<Comment>> entry = postEJB.getPost(id);
			Post post = entry.getKey();
			String content = post.getContent();
			content = content.replace("blog/image/", "../../blog/image/");
			content = content.replace("blog/pdf/", "../../blog/pdf/");
			post.setContent(content);
			request.setAttribute("post", entry);
			request.getRequestDispatcher("/WEB-INF/pages/blog/post.jsp").forward(request, response);
		} catch (ServletException | IOException e) {
			LOG.log(Level.SEVERE, "There was an error getting the post.", e);
		}
	}

	@POST
	@Path("post/{id : \\d+}")
	@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
	public void postComment(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context, @PathParam("id") int id, @FormParam("parentId") int parentId, @FormParam("level") int level, @FormParam("name") String name, @FormParam("email") String email, @FormParam("title") String title, @FormParam("content") String content) {
		try {
			content = content.replaceAll("\r?\n", "<br>");
			commentEJB.postComment(parentId, level, name, email, title, content);
			request.setAttribute("post", postEJB.getPost(id));
			request.getRequestDispatcher("/WEB-INF/pages/blog/post.jsp").forward(request, response);
		} catch (ServletException | IOException e) {
			LOG.log(Level.SEVERE, "There was an error posting the comment.", e);
		}
	}

	@GET
	@Path("image/{id : \\d+}")
	public void getImage(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context, @PathParam("id") int id) {
		CacheControlFilter.setCacheHeaders(response, 900); // 15 min
		try {
			Archive archive = archiveEJB.findArchive(id);
			if (archive != null) {
				byte[] data = archive.getData();
				response.setContentType("image/png");
				response.setContentLength(data.length);
				ServletOutputStream outputStream = response.getOutputStream();
				outputStream.write(data);
				outputStream.flush();
				outputStream.close();
			}
		} catch (IOException e) {
			LOG.log(Level.SEVERE, "There was an error getting the image.", e);
		}
	}

	@GET
	@Path("pdf/{id : \\d+}")
	public void getPdf(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context, @PathParam("id") int id) {
		CacheControlFilter.setCacheHeaders(response, 900); // 15 min
		try {
			Archive archive = archiveEJB.findArchive(id);
			if (archive != null) {
				byte[] data = archive.getData();
				response.setContentType("application/pdf");
				response.setContentLength(data.length);
				ServletOutputStream outputStream = response.getOutputStream();
				outputStream.write(data);
				outputStream.flush();
				outputStream.close();
			}
		} catch (IOException e) {
			LOG.log(Level.SEVERE, "There was an error getting the pdf.", e);
		}
	}

	@GET
	@Path("css/{filename : .*}")
	public void getStylesheet(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context, @PathParam("filename") String filename) {
		CacheControlFilter.setCacheHeaders(response, 31104000); // 1 year
		try {
			InputStream source = ClassLoaderUtil.getResourceAsStream("org/paulvargas/blog/resources/" + filename, this.getClass());
			if (source != null) {
				response.setContentType("text/css");
				ServletOutputStream target = response.getOutputStream();
				copy(source, target);
			} else {
				response.sendError(HttpServletResponse.SC_NOT_FOUND);
			}
		} catch (IOException e) {
			LOG.log(Level.SEVERE, "There was an error getting the stylesheet.", e);
		}
	}

	@GET
	@Path("fonts/{filename : .*}")
	public void getFont(@Context HttpServletRequest request, @Context HttpServletResponse response, @Context ServletContext context, @PathParam("filename") String filename) {
		CacheControlFilter.setCacheHeaders(response, 31104000); // 1 year
		try {
			InputStream source = ClassLoaderUtil.getResourceAsStream("org/paulvargas/blog/resources/" + filename, this.getClass());
			if (source != null) {
				ServletOutputStream target = response.getOutputStream();
				copy(source, target);
			} else {
				response.sendError(HttpServletResponse.SC_NOT_FOUND);
			}
		} catch (IOException e) {
			LOG.log(Level.SEVERE, "There was an error getting the font.", e);
		}
	}

}