Ctrl.Upload.java Source code

Introduction

Here is the source code for Ctrl.Upload.java

Source

/*
 * 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 Ctrl;

import Model.Products;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
 *
 * @author Admin
 */
public class Upload extends HttpServlet {
    private static final String UPLOAD_DIRECTORY = "Images";
    private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
    private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter writer = response.getWriter();

        try {

            if (!ServletFileUpload.isMultipartContent(request)) {
                // if not, we stop here

                writer.println("Error: Form must has enctype=multipart/form-data.");
                writer.flush();
                return;
            }
            // configures upload settings
            DiskFileItemFactory factory = new DiskFileItemFactory();
            // sets memory threshold - beyond which files are stored in disk 
            factory.setSizeThreshold(MEMORY_THRESHOLD);
            // sets temporary location to store files
            factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

            ServletFileUpload upload = new ServletFileUpload(factory);

            // sets maximum size of upload file
            upload.setFileSizeMax(MAX_FILE_SIZE);

            // sets maximum size of request (include file + form data)
            upload.setSizeMax(MAX_REQUEST_SIZE);

            // constructs the directory path to store upload file
            // this path is relative to application's directory
            String uploadPath = getServletContext().getRealPath("") + File.separator + UPLOAD_DIRECTORY;

            // creates the directory if it does not exist
            File uploadDir = new File(uploadPath);
            if (!uploadDir.exists()) {
                uploadDir.mkdir();
            }

            List<FileItem> formItems = upload.parseRequest(request);

            if (formItems != null && formItems.size() > 0) {

                // iterates over form's fields
                for (FileItem item : formItems) {
                    // processes only fields that are not form fields
                    if (!item.isFormField()) {
                        String fileName = new File(item.getName()).getName();
                        String filePath = uploadPath + File.separator + fileName;

                        File storeFile = new File(filePath);
                        // saves the file on disk
                        item.write(storeFile);

                        request.setAttribute("ten", fileName);
                        request.setAttribute("msg", UPLOAD_DIRECTORY + "/" + fileName);
                        request.setAttribute("message",
                                "Upload has been done successfully >>" + UPLOAD_DIRECTORY + "/" + fileName);
                    }
                }
            }

        } catch (Exception ex) {
            request.setAttribute("message", "There was an error: " + ex.getMessage());
        }
        // redirects client to message page
        getServletContext().getRequestDispatcher("/Product.jsp").forward(request, response);

    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);

    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);

    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}