Dynamic JNLP and ADF application

793149

Hi Everyone,

We use JDeveloper 11.1.1.7 and weblogic server 10.3.6. Our ADF application uses applet to connect to the user's scanner to scan and upload the images. This applet has parameters that is passed in order to show the reference while scanning. Now we are in a process of moving the applet to JNLP as the browser are desupporting NPAPI plugins. Can somebody let me know if there is any preferred way of doing this?

Right now I have created a jsp file(to create dynamic jnlp as the parameter values to be passed to the applet/jnlp should be dynamic) in ADF application workspace and set the content type of the page to application/x-java-jnlp-file. I am not able to evaluate the expression for the parameters except the values in implicit objects. Any help is much appreciated.

Regards

V. Praveen

793149

Hi Everyone,

Is there anything that anyone of you can share please?

Regards,

V. Praveen

793149

Hi All,

It is much appreciated if someone can give any insights in to it.

Shemeer

Did you try this from java script?

793149

Hi Shemeer,

Thanks for responding. I haven't tried it through javascript. Do you have any reference for it so that I can follow to implement?

Regards,

V. Praveen

793149

Hi All,

I could not get it done when it is an applet. However, I found an alternative solution by three steps and thought i should share this:

1. Convert the applet into a plain java application.

2. Add an action component to your page and add fileDownloadActionListener

3. Generate JNLP using the method attribute of fileDownloadActionListener.

Let us see them in detail

For point number 1,

I converted my applet into a java program by simply adding some attributes(to hold the values passed as arguments) and main() method as follows

  public static void main(String[] args)

  {

    MyApplet applet = new MyApplet();

    applet.setUrl(args[0]);// Make sure that you have an attribute named url in the class and have accessors

    applet.setInvoiceName(args[1]);// Make sure that you have an attribute named invoiceName in the class and have accessors

            

    JFrame frame = new JFrame();

    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

    frame.getContentPane().add(applet, BorderLayout.CENTER);

    frame.setTitle("Scan your document");

    applet.init();

    applet.start();

    frame.setSize(893, 510);

    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

    Dimension frameSize = frame.getSize();

    frame.setLocation((d.width-frameSize.width)/2, (d.height-frameSize.height)/2);

    frame.setVisible(true);

  }

For point 2,

Make sure that fileDownloadActionListener has contentType set to application/x-java-jnlp-file. Please take a look at the following code:

<af:commandLink id="commlink12" partialSubmit="true"

                shortDesc="Invoker" text="Invoker">

  <af:fileDownloadActionListener contentType="application/x-java-jnlp-file"

                                 filename="invoker.jnlp"

                                 method="#{myBacking.generateJnlp}"/>

For point 3,

Generate the JNLP dynamically in the backing bean. The following code is just a model to let know how it can be done.

  public void generateJnlp(FacesContext facesContext,

                           OutputStream outputStream) throws IOException

  {

    String invoiceNameToBePassed = null;

    String urlToBePassed = null;

  //logic to get the data and it can be of anything as per your requirement, I have just used the current row details for demo purpose

    MyInvoiceViewRowImpl currentRow = (MyInvoiceViewRowImpl)myAppModule.getMyInvoiceView1().getCurrentRow();

  invoiceNameToBePassed = currentRow.getAttribute("InvoiceName").toString();

    urlToBePassed = currentRow.getAttribute("TargetUrl").toString();

              

    StringBuffer sb = new StringBuffer();

    String xmlEnc         = "<?xml version='1.0' encoding='UTF-8'?>\n";

    String jnlpRoot       = "<jnlp spec=\"1.0+\" href=\"\" codebase=\""+codeBaseUrl+"\">\n";//string value of codebase to be added above

    String jnlpInforStart = "  <information>\n";

    String jnlpTitle      = "    <title>Invoker App</title>\n";

    String jnlpVendor     = "    <vendor>iVend</vendor>\n";

    String jnlpInforEnd   = "  </information>\n";

    String jnlpResources  = "  <resources>\n"+

                            "    <j2se version=\"1.6+\" />\n"+

                            "    <jar href=\"myRequiredJar1.jar\"/>\n"+

                            "    <jar href=\"myRequiredJar2.jar\" />\n"+

                            "  </resources>\n";

    String jnlpSecurity   = "  <security>\n"+

                            "    <all-permissions/>\n"+

                            "  </security>\n";

    String jnlpApp        = "  <application-desc name=\"Invoker App\" width=\"873\" height=\"540\"\n" +

                            "  main-class=\"com.test.MyApplet\">\n" +

                            "    <argument>"+invoiceNameToBePassed+"</argument>\n" +

                            "    <argument>"+urlToBePassed+"</argument>\n" +  

                            "  </application-desc>\n";

    String jnlpFoot       = "</jnlp>\n";

              

    sb.append(xmlEnc)

      .append(jnlpRoot)

      .append(jnlpInforStart)

      .append(jnlpTitle)

      .append(jnlpVendor)

      .append(jnlpInforEnd)

      .append(jnlpResources)

      .append(jnlpSecurity)

      .append(jnlpApp)

      .append(jnlpFoot);

      LOGGER.info("The JNLP file generated is\n"+sb);

              

    byte[] bytes =sb.toString().getBytes();

    outputStream.write(bytes);

    outputStream.flush();

  }

Regards,

V. Praveen