How to add multiple Textfields in single or multiple pages in a Loop - spring-boot

Question

I am Using Itext 5 maven and I want to add multiple textfields in multiple pdf pages. like page 1 need 3 fields, page 2 need 4 fields etc.
I have write the below code
public byte[] setupDocument(EditPdfDTO editPdfDTOList, MultipartFile attachment)
{
WritePDF obj = new WritePDF();
Document document = null;
PdfWriter writer = null;
PdfImportedPage page = null;
PdfReader reader = null;
try
{
// Create output PDF
document = new Document(PageSize.A4);
document.setMargins(0, 0, 0, 0);
writer = PdfWriter.getInstance(document,
new FileOutputStream("D:/test.pdf"));
document.open();
PdfContentByte cb = writer.getDirectContent();
// Load existing PDF
reader = new PdfReader(attachment.getBytes());
int totalPages = reader.getNumberOfPages();
for (int i = 0; i < totalPages; i++)
{
page = writer.getImportedPage(reader, i + 1);
document.newPage();
cb.addTemplate(page, 0, 0);
for (int j = 0; j < editPdfDTOList.getPdf().size(); j++)
{
if (i + 1 == editPdfDTOList.getPdf().get(j).getPageNo())
{
BaseFont baseFont = null;
try
{
baseFont = BaseFont.createFont();
}
catch (DocumentException | IOException e1)
{
e1.printStackTrace();
}
int a, b;
a = editPdfDTOList.getPdf().get(j).getxCoordinate();
b = editPdfDTOList.getPdf().get(j).getyCoordinate();
String str = editPdfDTOList.getPdf().get(j).getTextContent();
Rectangle linkLocation =
new Rectangle(a, b + baseFont.getDescentPoint(str, 10),
a + 10 + baseFont.getWidthPoint(str, 10),
b + baseFont.getAscentPoint(str, 10) + 10);
TextField field =
new TextField(writer, linkLocation, "user1" + j+UUID.randomUUID());
field.setFontSize(10);
field.setOptions(TextField.MULTILINE | TextField.READ_ONLY);
field.setTextColor(BaseColor.RED);
field.setText(str);
field.setBorderWidth(1);
cb = writer.getDirectContent();
try
{
cb.addAnnotation(field.getTextField(),false);
}
catch (IOException | DocumentException e)
{
e.printStackTrace();
}
}
}
}
}
catch (DocumentException | IOException e)
{
e.printStackTrace();
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
document.close();
}
return null;
}
this code is able to add only one Textfield on every expected but not to add 2 or many textfields in a single page.
there is no issue of multiple try--catch block.

Answer 1

The appropriate classes to use
First of, you say you "want to add multiple textfields in multiple pdf pages". When implementing tasks like this, i.e. tasks that take a single document and want to somehow manipulate it while keeping it structurally more or less as before, one should usually work with a PdfReader/PdfStamper couple. This allows you to concentrate on the manipulation and provides a copy of the original PDF with all its properties to work on.
Adding multiple fields to a page of an existing PDF
Adding multiple fields to a single existing page is trivial, e.g.:
PdfReader pdfReader = new PdfReader(resource);
PdfStamper pdfStamper = new PdfStamper(pdfReader, output);
TextField field1 = new TextField(pdfStamper.getWriter(),
new Rectangle(100, 800, 200, 820), "Field1");
field1.setBorderColor(BaseColor.CYAN);
field1.setBorderStyle(PdfBorderDictionary.STYLE_DASHED);
field1.setBorderWidth(BaseField.BORDER_WIDTH_MEDIUM);
field1.setText("Field 1");
pdfStamper.addAnnotation(field1.getTextField(), 1);
TextField field2 = new TextField(pdfStamper.getWriter(),
new Rectangle(300, 800, 400, 820), "Field2");
field2.setBorderColor(BaseColor.RED);
field2.setBorderStyle(PdfBorderDictionary.STYLE_INSET);
field2.setBorderWidth(BaseField.BORDER_WIDTH_THIN);
field2.setText("Field 2");
pdfStamper.addAnnotation(field2.getTextField(), 1);
pdfStamper.close();
(AddField test testAddMultipleFields)
Applied to my example document
the code generates
Thus, there is no conceptual problem adding multiple text fields to the same document page, it works in a very natural manner.
In your case I would switch to using a PdfReader/PdfStamper couple. If some issue still remain, I would inspect your data. Probably they simply contain only a single field dataset per page. Or two textfields have the same coordinates and, therefore, look like one. Or some text fields have off-screen coordinates. Or... Or... Or...
The original answer
Originally the code in the question looked differently. This original answer focused on issues of that code.
You claim your code
is able to add only one Textfield on every expected but not to add 2 or many textfields in a single page
I doubt that because
you have two distinct objects writing to the same file "D:/TemplateFilePDf/" + attachment.getOriginalFilename() concurrently, the PdfWriter writer and the PdfStamper stamper. If you get something sensible as a result of your code, then only by pure luck; and
additionally stamper is instantiated for a null instance of PdfReader. This actually will cause a NullPointerException in the constructor which will keep your textfield adding code from being executed at all.
Thus, either the code you shared is considerably different from the code you run or your test runs actually all throw that NullPointerException and you probably find the outputs of a former, less broken version of your code which happens to have added only a single text field.
After fixing those two issues, some questions still remain (e.g. what is the intention of that cb.fill()? That instruction is only allowed directly after a path definition, the path whose inner area to fill, but I don't see you defining any path).
Furthermore, you access your editPdfDTOList for a lot of relevant values but we don't know those values. Thus, we cannot run your code to try and reproduce the issue. Probably you create only a single textfield because that object contains only values for a single textfield...