Examples of org.itsnat.comp.iframe.HTMLIFrameFileUpload

org.itsnat.comp.iframe.HTMLIFrameFileUpload
An instance of this interface represents a file uploading task associated to an iframe component and an input type=file element.
When this instance is created by calling {@link org.itsnat.comp.iframe.ItsNatHTMLIFrame#getHTMLIFrameFileUpload(HTMLInputElement)}or {@link org.itsnat.comp.iframe.ItsNatHTMLIFrame#getHTMLIFrameFileUpload(ClientDocument,HTMLInputElement)}, JavaScript code is generated to create a temporary form to submit the file specified in the <input type=file> element to the <iframe> as target. Because this code is sent in the end of the request, developers can register some listener calling {@link #addItsNatServletRequestListener(ItsNatServletRequestListener)}to receive and process the file uploading request.

In spite of developers have absolute freedom to process the file upload request, the method {@link #processFileUploadRequest(ItsNatServletRequest,ItsNatServletResponse)} can be optionally called,this method executes the typical header parsing and exposes the file being uploaded as an input stream.

The thread dispatching the file upload listeners does not synchronize the {@link org.itsnat.core.ItsNatDocument}object, therefore any access to the {@link org.itsnat.core.ItsNatDocument} or dependent objects must be synchronized before.

When file upload processing ends (when listeners have been executed) this object is automatically disposed and cannot be reused (explicit call to {@link #dispose()} is not needed).

{@link ItsNatUserData} methods are thread safe.
ItsNat provides a default implementation of this interface.
@author Jose Maria Arranz Santamaria @see org.itsnat.comp.iframe.ItsNatHTMLIFrame

        button.addEventListener("click", this);
    }


    public void handleEvent(Event evt)
    {
        final HTMLIFrameFileUpload iframeUpload = iframe.getHTMLIFrameFileUpload(input.getHTMLInputElement());
        ItsNatServletRequestListener listener = new ItsNatServletRequestListenerSerial()
        {
            public void processRequest(ItsNatServletRequest request, ItsNatServletResponse response)
            {
                FileUploadRequest fileUpReq = iframeUpload.processFileUploadRequest(request, response);


                StringBuilder html = new StringBuilder();
                html.append("<html><head /><body>");
                html.append("<p>Content Type:\"" + fileUpReq.getContentType() + "\"</p>");
                html.append("<p>Field Name:\"" + fileUpReq.getFieldName() + "\"</p>");
                html.append("<p>File Name:\"" + fileUpReq.getFileName() + "\"</p>");
                html.append("<p>File Size:\"" + fileUpReq.getFileSize() + "\"</p>");


                FileInputStream fileOrig = null;
                try
                {
                    fileOrig = new FileInputStream(fileUpReq.getFileName());
                }
                catch(IOException ex)
                {
                    html.append("<h2>Cannot test a local file</h2>");
                }


                try
                {
                    InputStream fileUp = fileUpReq.getFileUploadInputStream();
                    long count = 0;
                    if (fileOrig != null)
                    {
                        int b1,b2;
                        do
                        {
                            b1 = fileOrig.read();
                            b2 = fileUp.read();
                            if (b1 != b2) throw new RuntimeException("Different Files");
                            count++;
                        }
                        while ((b1 != -1) && (b2 != -1));
                    }
                    else
                    {
                        int b;
                        do
                        {
                            b = fileUp.read();
                            count++;
                        }
                        while (b != -1);
                    }


                    count--; // Quitamos la lectura del -1
                    long fileSize = fileUpReq.getFileSize();
                    if (fileSize != count) throw new RuntimeException("Wrong File Size");
                    html.append("</body></html>");


                    ServletResponse servRes = response.getServletResponse();
                    servRes.getWriter().print(html.toString());
                }
                catch(IOException ex)
                {
                    throw new RuntimeException(ex);
                }
            }
        };
        iframeUpload.addItsNatServletRequestListener(listener);
    }

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        EventListener timerListener = new EventListener() {
            public void handleEvent(Event evt) { }   // Nothing to do, this timer just update the client with the current state of progressElem
        };
        final ItsNatTimerHandle timerHnd = timer.schedule(null,timerListener,0,1000);


        final HTMLIFrameFileUpload iframeUpload = iframe.getHTMLIFrameFileUpload(clientDoc,input.getHTMLInputElement());


        ItsNatServletRequestListener listener = new ItsNatServletRequestListener()
        {
            public void processRequest(ItsNatServletRequest request, ItsNatServletResponse response)
            {
                FileUploadRequest fileUpReq = iframeUpload.processFileUploadRequest(request, response);


                try
                {
                    ServletResponse servRes = response.getServletResponse();
                    Writer out = servRes.getWriter();
                    out.write("<html><head /><body>");
                    out.write("<p>Content Type: \"" + fileUpReq.getContentType() + "\"</p>");
                    out.write("<p>Field Name: \"" + fileUpReq.getFieldName() + "\"</p>");
                    out.write("<p>File Name: \"" + fileUpReq.getFileName() + "\"</p>");
                    out.write("<p>File Size: " + fileUpReq.getFileSize() + "</p>");
                    out.write("</body></html>");


                    long fileSize = fileUpReq.getFileSize();
                    if (fileSize == 0) return;


                    byte[] buffer = new byte[10*1024];
                    InputStream fileUp = fileUpReq.getFileUploadInputStream();
                    long count = 0;
                    int read = 0;
                    do
                    {
                        if (iframeUpload.isDisposed())
                            return;


                        try { Thread.sleep(50); }catch(InterruptedException ex){ }
                        count += read;


                        long per = (count * 100) / fileSize;
                        synchronized(itsNatDoc)
                        {
                            Text text = (Text)progressElem.getFirstChild();
                            text.setData(String.valueOf(per));
                        }


                        read = fileUp.read(buffer);
                    }
                    while (read != -1);
                }
                catch(IOException ex)
                {
                    throw new RuntimeException(ex);
                }
                finally
                {
                    synchronized(itsNatDoc)
                    {
                        timerHnd.cancel();
                    }
                }
            }
        };
        iframeUpload.addItsNatServletRequestListener(listener);
    }
};
button.addEventListener("click", listener);


    }

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