controller.uploadImage.java Source code

Introduction

Here is the source code for controller.uploadImage.java

Source

package controller;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

/*
 * 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.
 */
/**
 *
 * @author jobayer
 */
public class uploadImage extends HttpServlet {

    private static final String UPLOAD_DIRECTORY = "upload";

    // upload settings
    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, Exception {
        response.setContentType("text/html;charset=UTF-8");

        //ArrayList<String> ls=new ArrayList();

        try (PrintWriter out = response.getWriter()) {
            //if (!ServletFileUpload.isMultipartContent(request)) {
            //if not, we stop here
            //PrintWriter writer = response.getWriter();
            //writer.println("Error: Form must has enctype=multipart/form-data.");
            //writer.flush();
            //return;

            //}
            // configures upload settings
            HttpSession ssn = request.getSession();

            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();
            }

            try {
                // parses the request's content to extract file data
                @SuppressWarnings("unchecked")
                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
                            if (storeFile.exists()) {

                                ssn.setAttribute("uploadMsg", "File exists");

                                response.sendRedirect("register.htm?name=index");

                            } else {
                                //if(item.isInMemory())
                                item.write(storeFile);
                                ssn.setAttribute("imgname", storeFile.getName());
                                ssn.setAttribute("uploadMsg", "File uploded");
                                response.sendRedirect("register.htm?name=null");

                            }

                        } else {

                            ssn.setAttribute(item.getFieldName(), item.getString());

                        }
                    }
                }
            } catch (Exception ex) {
                ssn.setAttribute("uploadMsg", ex.getMessage());
                response.sendRedirect("register.htm?name=index");
            }

        }

    }

    // <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 {
        try {
            processRequest(request, response);
        } catch (Exception ex) {
            Logger.getLogger(uploadImage.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * 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 {
        try {
            processRequest(request, response);
        } catch (Exception ex) {
            Logger.getLogger(uploadImage.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

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

}