barcode generator source code in c#.net Adding a submit button to an existing form in Java

Generate Quick Response Code in Java Adding a submit button to an existing form

Adding a submit button to an existing form
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Figure 9.3 shows a form you created in section 8.5 (see figure 8.6) opened with the Adobe Reader plug-in in Google Chrome. I ve manually filled out the form with my name, login, and the most obvious reason why I want to visit the Foobar Film Festival. I ve also added buttons to the form that will allow you to submit this data to a server. There are four ways to submit this data:
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As an HTML form The server will receive a query string As FDF This is the Forms Data Format As XFDF This is the XML version of the Forms Data Format As PDF The full PDF, including the data that was entered, is sent to the server
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Sending the form as a full PDF is only possible if the end user is filling out the form in the full Acrobat, so there s no button for that option in figure 9.3. In this example, we re only looking at the first three options. The fourth button in the form, Reset, can be used to reset the data that was entered manually.
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Figure 9.3 Adding submit buttons to an existing form
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Listing 9.6 SubmitForm.java
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PdfReader reader = new PdfReader(src); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); PushbuttonField button1 = new PushbuttonField( stamper.getWriter(), new Rectangle(90, 660, 140, 690), "post"); button1.setText("POST"); button1.setBackgroundColor(new GrayColor(0.7f)); button1.setVisibility( PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT); PdfFormField submit1 = button1.getField(); submit1.setAction(PdfAction.createSubmitForm( "/book/request", null, PdfAction.SUBMIT_HTML_FORMAT | PdfAction.SUBMIT_COORDINATES)); stamper.addAnnotation(submit1, 1); PushbuttonField button2 = new PushbuttonField( stamper.getWriter(), new Rectangle(200, 660, 250, 690), "FDF"); button2.setBackgroundColor(new GrayColor(0.7f)); button2.setText("FDF"); button2.setVisibility( PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT); PdfFormField submit2 = button2.getField(); submit2.setAction(PdfAction.createSubmitForm( "/book/request", null, PdfAction.SUBMIT_EXCL_F_KEY)); stamper.addAnnotation(submit2, 1); PushbuttonField button3 = new PushbuttonField( stamper.getWriter(), new Rectangle(310, 660, 360, 690), "XFDF"); button3.setBackgroundColor(new GrayColor(0.7f)); button3.setText("XFDF"); button3.setVisibility( PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT); PdfFormField submit3 = button3.getField(); submit3.setAction(PdfAction.createSubmitForm( "/book/request", null, PdfAction.SUBMIT_XFDF)); stamper.addAnnotation(submit3, 1); PushbuttonField button4 = new PushbuttonField( stamper.getWriter(), new Rectangle(420, 660, 470, 690), "reset"); button4.setBackgroundColor(new GrayColor(0.7f)); button4.setText("RESET"); button4.setVisibility( PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT); PdfFormField reset = button4.getField(); reset.setAction(PdfAction.createResetForm(null, 0)); stamper.addAnnotation(reset, 1); stamper.close();
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Button to POST as FDF
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Button to POST as XFDF
Button to reset the form
NOTE There s one button missing in figure 9.3 and listing 9.6: a button that submits the form using the option PdfAction.SUBMIT_PDF. This was a deliberate choice, because this button won t work if the end user only has Adobe Reader, not the full Acrobat.
Making a form web ready
You ll recognize the methods to create and shape the PushbuttonField and to obtain the corresponding PdfFormField. The key methods in this code snippet are two static methods from the PdfAction class we haven t discussed before.
createSubmitForm() Expects three parameters. The first parameter is a String representing a URL. In listing 9.6, you specify the path /book/request. This is a path to a servlet in the book application. We ll have a look at this servlet in listing 9.7. The second parameter is an array of Object values. You can pass an array of String values with field names, or an array of PdfAnnotation values
representing fields. This can be used to limit the data that is sent to the server. The third parameter defines the submit method and extra options. createResetForm() Expects two parameters. The first parameter has the same meaning as the second parameter of the createSubmitForm() method. The second parameter is a flag, specifying whether the fields in the array should be included (0) or excluded (1). The use of null and 0 in listing 9.6 will reset all the fields.
Before discussing the different submit methods and options, we ll take a look at what happens on the server side if you use the /request URL pattern. This pattern corresponds with this ShowData servlet.
Listing 9.7 ShowData.java
public class ShowData extends HttpServlet { protected void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/plain"); PrintWriter out = response.getWriter(); Enumeration<String> parameters = request.getParameterNames(); String parameter; while (parameters.hasMoreElements()) { Shows parameters/ values sent with GET parameter = parameters.nextElement(); out.println(String.format("%s: %s", parameter, request.getParameter(parameter))); } } protected void doPost( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/plain"); OutputStream os = response.getOutputStream(); InputStream is = request.getInputStream(); byte[] b = new byte[256]; Shows request sent int read; to server with POST while ((read = is.read(b)) != -1) { os.write(b, 0, read); } } }
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