ImageUploadServlet

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@WebServlet(name = "ImageUpload", urlPatterns = { "/ImageUpload" })
@MultipartConfig(maxFileSize = 10 * 1024 * 1024) // max 10MB
public class ImageUploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        InputStream inputStream = null;
        Part filePart = null;
        // obtains the upload file part in this multipart request
        try {
            filePart = req.getPart("image");
        } catch (Exception e) {
            System.out.println("Erreur d'upload : " + e);
            req.getRequestDispatcher("/index.jsp").forward(req, resp);
        }
        if (filePart != null) {
            // prints out some information for debugging
            System.out.println(filePart.getSubmittedFileName());
            System.out.println(filePart.getSize());
            System.out.println(filePart.getContentType());

            // obtains input stream of the upload file
            inputStream = filePart.getInputStream();
        }

        // Add to database EASY
        PreparedStatement pst = null;
        Connection conn = Connexion.getInstance();

        try {
            pst = conn.prepareStatement("INSERT INTO images VALUES(null, ?, ?, ?)");

            pst.setBinaryStream(1, inputStream);
            pst.setString(2, filePart.getSubmittedFileName());
            pst.setLong(3, filePart.getSize());
            pst.executeUpdate();
            pst.close();
        } catch (Exception e) {
            System.out.println("Exception Servlet: " + e);
            req.setAttribute("info", "Non Ajouté!");
            req.getRequestDispatcher("/index.jsp").forward(req, resp);
            return;
        }

        req.setAttribute("info", "Ajouté !");
        req.getRequestDispatcher("/index.jsp").forward(req, resp);
    }

}