Hi,
I am having trouble using PdfTemplate. I am taking
existing Java code that uses iText to print a document
with varying pages, and I want to add a PdfTemplate to
each page to display the total number of pages (which
I won't know until I get to the end of the process).
I would appreciate any help. I'm sorry this is so
much code; I chopped out everything that I was
confident would not be applicable to this problem.
The printing code basically works as follows:
-Use a PdfStamper to read in a page with form fields,
fill in the fields. Write the page to byte array.
-Use a PdfCopy object and its getImportedPage() method
to copy each byte array to the final file (using a new
Reader constructed for each byte array).
-Repeat the above 2 steps for every page (variable
number).
I've gotten the use of PdfTemplate to occur without
any runtime errors (at least any I can see from a
console). I think I may be adding the template to the
wrong object. I have tried adding it to both the
PdfCopy object and the PdfStamper object (not both at
once) - the places I tried separately I marked with a
"here?" comment. Whichever I do, no text shows up in
the PDF file from the template. The rest of the
printing process works properly; the template is the
exception.
Control flow starts in the generate() method. Some of
this is pseudo-code.
FileOutputStream outStream;
Document document;
PdfCopy copier;
Helper helper;
generate() {
helper = new Helper();
outStream = new FileOutputStream(OUT_FILENAME);
for each page { // variable # of pages
ByteArrayOutputStream bs = new
ByteArrayOutputStream();
// read in a single page with form fields.
PdfReader reader = new
PdfReader(ORIGINAL_PDF_FILE);
PdfStamper stamper = new PdfStamper(reader,
bs);
// code omitted: use the stamper to set form
fields.
addTemplateToPage(stamper.getOverContent(1));
// here?
stamper.setFormFlattening(true);
stamper.close();
bs.close();
concat(bs converted to byte[]);
} // end for each page
copier.close();
document.close();
outStream.close();
}
void concat(byte[] b) {
PdfReader reader = new PdfReader(b);
int n = reader.getNumberOfPages();
if (document == null || copier == null) {
document = new
Document(reader.getPageSizeWithRotation(i));
copier = new PdfCopy(document, outStream);
copier.setPageEvent(helper);
document.open();
}
PdfImportedPage page;
for (int i = 0; i < n; ) {
++i;
page = copier.getImportedPage(reader, i);
// PdfImportedPage throws error on
addTemplate() calls, so can't add template here.
copier.addPage(page);
addTemplateToPage(copier.getDirectContent());
// here?
copier.freeReader(reader);
}
}
void addTemplateToPage(PdfContentByte cb) {
if (template == null {
template = cb.createTemplate(100, 100);
template.setBoundingBox(new Rectangle(-20,
-20, 300, 300)); // tried without this line too.
helper.setTemplate(template);
}
cb.addTemplate(100, 100);
}
class Helper extends PdfPageEventHelper {
PdfTemplate template;
void setTemplate(PdfTemplate template) {
this.template = template;
}
public void onCloseDocument(PdfWriter writer,
Document document) {
BaseFont helvetica = null;
try {
helvetica =
BaseFont.createFont("Helvetica", BaseFont.WINANSI,
false);
} catch (Exception ex) {
print errors and return;
}
template.beginText();
template.setFontAndSize(helvetica, 12);
template.setTextMatrix(200, 200);
template.showText(200, 200);
template.endText();
// print statement here to verify this is being
called - it is.
}
} // end class Helper
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