GetPictureServlet.java

package com.popx.presentazione;

import com.popx.persistenza.ProdottoDAO;
import com.popx.persistenza.ProdottoDAOImpl;

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 java.io.IOException;
import java.io.OutputStream;

@WebServlet(name = "GetPictureServlet", urlPatterns = {"/getPictureServlet"})
public class GetPictureServlet extends HttpServlet {

    private final ProdottoDAO prodottoDAO = new ProdottoDAOImpl();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String id = request.getParameter("id");

        if (id == null || id.isEmpty()) {
            response.sendError(HttpServletResponse.SC_BAD_REQUEST, "ID prodotto mancante.");
            return;
        }

        try {
            byte[] imageData = prodottoDAO.getProductImageById(id);

            if (imageData != null) {
                response.setContentType("image/jpeg");
                try (OutputStream out = response.getOutputStream()) {
                    out.write(imageData);
                }
            } else {
                response.sendError(HttpServletResponse.SC_NOT_FOUND, "Immagine non trovata.");
            }
        } catch (Exception e) {
            e.printStackTrace();
            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Errore durante il recupero dell'immagine.");
        }
    }
}