sipl.servlets.FileUploadServlet.java Source code

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Here is the source code for sipl.servlets.FileUploadServlet.java

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/*
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package sipl.servlets;

/**
 *
 * @author WM
 */
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;
import sipl.db.Conexion;
import sipl.db.variableSisDAO;
import sipl.dominio.VariableSis;

/**
 * A Java servlet that handles file upload from client.
 *
 * @author www.codejava.net
 */
public class FileUploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    // location to store file uploaded
    private static final String UPLOAD_DIRECTORY = "Imagenes";

    // 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
    String nombre = "";

    /**
     * Upon receiving file upload submission, parses the request to read upload
     * data and saves the file on disk.
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // checks if the request actually contains upload file
        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
        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
        Conexion con = new Conexion();
        variableSisDAO varDAO = new variableSisDAO(con);
        VariableSis var = varDAO.getTipo_variable(1);
        String dir = var.getDatos();
        //        String uploadPath = getServletContext().getRealPath("")
        //                + File.separator + UPLOAD_DIRECTORY;
        String uploadPath = dir + 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();
                        nombre = fileName;
                        String filePath = uploadPath + File.separator + fileName;
                        File storeFile = new File(filePath);
                        item.write(storeFile);
                        request.setAttribute("message", "Upload has been done successfully!");
                        request.setAttribute("foto", nombre);
                    }
                }
            }
        } catch (Exception ex) {
            request.setAttribute("message", "There was an error: " + ex.getMessage());
        }
        // redirects client to message page
        getServletContext().getRequestDispatcher("/uploadImagen.jsp?accion=1").forward(request, response);
    }
}