Wednesday, September 12, 2018

Re: Upload a file gwt

There is your basic
<g:FormPanel ui:field="formPanel" encoding="multipart/form-data" method="POST">
        <g:FileUpload name="data" ui:field="dataUpload" visible="false" /><!-- not visible due to custom UI -->
        <g:RadioButton stylePrimaryName="radio-check clearfix" name="dataType" ui:field="textDataType" debugId="textDataType" text="Plain text"/>
        <g:RadioButton stylePrimaryName="radio-check clearfix" name="dataType" ui:field="binaryDataType" debugId="binaryDataType" text="Binary"/>
During setup/creation we programmatically assign the action via formPanel.setAction.

In the end we do a formPanel.submit() when the user clicks on the upload button.

On our servlet we have @MultipartConfig
Then our doPost:
Collection<Part> parts = request.getParts();
        try {


            try {
                String dataType = request.getParameter("dataType");

                Part data = request.getPart("data");
                try (InputStream is = data.getInputStream()) {
                    Do your thing with the available data
            } catch (... e) {
                your error handling

        } finally {
            for (Part part : parts) {
                try {
                } catch (IOException e) {
                    logger.warn("Failed to delete part '{}' from server", part.getName(), e);

On Wednesday, 12 September 2018 15:42:03 UTC+2, Ousti Driss wrote:
let's say for example the user wants to upload a txt file, and he indicates that it's a data file type,
I'm interested in the keyword (String) "data", how can I add it to the formPanel?
can you give the java syntax ? 
thank you

On Wed, Sep 12, 2018 at 3:27 PM Maarten Daalder (ISAAC Software Solutions) <> wrote:
In our case we place all elements to be 'uploaded' in the same FormPanel as the file input element.
Then in our servlet we first retrieve all parts (HttpServletRequest#getParts) after which we use getParameter to read out the filled in form inputs.
The file itself is retrieved via a getPart(name of input here).

On Wednesday, 12 September 2018 12:25:16 UTC+2, Ousti Driss wrote:
I founnd something similar, 
On the client side I instanciated hidden objects,
I gave them a name and for the value it's the one selected by the user,
now, on the server side, when the result is parsed, I've got a list of items, how can I check 
that an item is the hidden one ?

On Wednesday, September 12, 2018 at 12:17:54 PM UTC+2, Josselin B. wrote:

You can use the form input name to send informations for exemple 

Le mer. 12 sept. 2018 à 11:59, Ousti Driss <> a écrit :
Thank you for your answer Paul,
Your solution seems logical,
but in my case these other data, I need it from the first submit,
these data are basically type of file ... 
I need it to store correctly the file in the database,
Moreover, on the client side a submit is not taken into account untill all the other data are filled.

On Wednesday, September 12, 2018 at 11:51:41 AM UTC+2, Paul Robinson wrote:
You can store the file on the server in a temporary area, returning a key to the UI. Then, when the user is ready to submit the lot, the UI sends the file's key to the server as well as the other data.

The server can then move the file data to a permanent home, or mark it as permanent.


On Wed, 12 Sep 2018, 10:06 Ousti Driss, <> wrote:
Hey guys,

While browsing on the internet I found a way to upload a file in a gwt app,
I managed to reimplement the code and it works just fine using formPanel,
It just happens that this file needs to be stored in a mysql database,
the problem is before the user selects the file he wants to upload, he needs to pick up two elements from 
2 combobox,
I need those informations so I can build my sql querry, How I can get those fields selected by the user 
in the  upload File servlet?

Thanks a lot,  

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