Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package hu.jozsef.vesza.so.servlets; import com.google.appengine.api.datastore.Blob; import com.googlecode.objectify.Objectify; import hu.jozsef.vesza.so.model.Event; import hu.jozsef.vesza.so.utils.OfyService; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.logging.Logger; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.io.IOUtils; /** * * @author Jzsef */ public class EventImageService extends HttpServlet { private static final Logger log = Logger.getLogger(EventManagerServlet.class.getName()); Objectify objectify = OfyService.ofy(); @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Long eventId = new Long(request.getParameter("identifier")); Event fetchedEvent = objectify.load().type(Event.class).id(eventId).now(); String imageUrl = "/WEB-INF/" + fetchedEvent.getShortTitle() + ".png"; String imageRealPath = this.getServletContext().getRealPath(imageUrl); InputStream imgStream = new FileInputStream(new File(imageRealPath)); Blob image = new Blob(IOUtils.toByteArray(imgStream)); if (image != null) { response.setContentType("image/jpeg"); response.getOutputStream().write(image.getBytes()); } else { response.getWriter().write("no image"); } } }