Tuesday, September 24, 2013

Re: Storing uploaded file in gwt (server side)

You can do it through a servlet. Below is an example of the servlet code. Do not forget to declare the servlet in web.xml.

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
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.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
     * Accepts a Http request parameters and post a file to UforgeBuilder end
     * point. Used to upload profile picture.
    protected void doPost(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
        try {

            // Check that we have a file upload request
            boolean isMultipart = ServletFileUpload.isMultipartContent(request);
            if (isMultipart) {

                // Create a factory for disk-based file items
                FileItemFactory factory = new DiskFileItemFactory();

                // Create a new file upload handler
                ServletFileUpload upload = new ServletFileUpload(factory);

                // Parse the request
                List<?> /* FileItem */items = upload.parseRequest(request);

                // Process the uploaded items
                Iterator<?> iter = items.iterator();

                File uploadedFile = null;

                while (iter.hasNext()) {
                    FileItem item = (FileItem) iter.next();
                    /* text field */
                    // here you can retrieve text fields
                    if (item.isFormField()) {
                        if (item.getFieldName().equals("xxxx")) String field1 = item.getString();
                        else if (item.getFieldName().equals("xxxx")) String field2 = item.getString();
                    /* upload file field */
                    else {
                        if (!item.getName().isEmpty()) {
                            String fileName = item.getName();
                            String folder=this.getServletContext().getRealPath(Config.UPLOAD_DIRECTORY);
                            File uploadDirectory = new File(folder);
                            if (!uploadDirectory.exists()) uploadDirectory.mkdirs();
                            uploadedFile = new File(uploadDirectory, fileName);

                    // now you can handle the file "uploadedFile"

        catch (Exception e) {


Le lundi 16 septembre 2013 20:07:07 UTC+1, Pradeep Kumar a écrit :


Hi All,  

I am new to GWT, I am facing some issue with file creation.

I am uploading a file from client side and want to store that file in server side and parse it and create tables in database for the data present in the file.

When I try to create a file at server side there is some file.io permission issue App engine is not allowing me to create the file.

Please let me know how can I solve this issue.

I did browse net, didn't find any solutions.

In the mean time I did read about sandboxing and some data store concept

Please let me know how can I use for my problem.

Thanks in Advance, Pradeep

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