package teste;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = {"/produto/imagens"})
public class ImagemServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       try (InputStream is = new FileInputStream(new File("C:\\Projetos\\setas1.png"))) {
           response.setContentType("image/png");
           response.getOutputStream().write(getBytesFromInputStream(is));
       }
    }

    public static byte[] getBytesFromInputStream(InputStream is) throws IOException {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024 * 1024];

        int len;
        while ((len = is.read(buffer)) != -1) {
            os.write(buffer, 0, len);
        }

        return os.toByteArray();
    }
}