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After resize document, new content have as same size. How save new size in ByteArrayOutputStream?

I have problem with size document. I pass vertical orientation(595.0x842.0) pdf and I change orientation pdf to horizontal(842.0x595.0) but When I return ByteArrayOutputStream as ByteArray and I try read this ByteArray I get vertical orientation(595.0x842.0) instead horizontal(842.0x595.0)
To write new content I use PdfWriter and I send Document with new size and ByteArrayOutputStream as second parametr.
PdfReader reader = new PdfReader(pdf.getFile());
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Document document = new Document(PageSize.A4.rotate(), 0, 0, 0, 0);
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
I expect the output horizontal(842.0x595.0) instead (595.0x842.0)
I need to this dimension in this code:
PdfReader reader = new PdfReader(pdf.getFile());
int n = reader.getNumberOfPages();
PdfStamper stamper = new PdfStamper(reader,outputStream);
PdfContentByte pageContent;
for (int i = 0; i < n;) {
pageContent = stamper.getOverContent(++i);
System.out.println(reader.getPageSize(i));
ColumnText.showTextAligned(pageContent, Element.ALIGN_RIGHT,
new Phrase(String.format("page %s of %s", i, n)),
reader.getPageSize(i).getWidth()- 20, 20, 0);
}
This variable pdf.getFile() is a ByteArray(ByteArrayOutputStream ) from previous code.
I expect page number in right down corner(x point 842) but actual is 595.
For better understand I send screenshot.

You use the PdfReader method getPageSize but you should use getPageSizeWithRotation, i.e. you should replace
System.out.println(reader.getPageSize(i));
ColumnText.showTextAligned(pageContent, Element.ALIGN_RIGHT,
new Phrase(String.format("page %s of %s", i, n)),
reader.getPageSize(i).getWidth()- 20, 20, 0);
by
System.out.println(reader.getPageSizeWithRotation(i));
ColumnText.showTextAligned(pageContent, Element.ALIGN_RIGHT,
new Phrase(String.format("page %s of %s", i, n)),
reader.getPageSizeWithRotation(i).getWidth()- 20, 20, 0);
The Backgrounds
There are two properties of a page responsible for the final displayed page dimension: MediaBox and Rotate. (Let's for the moment ignore the crop box and all the other boxes which also exist.)
A landscape A4 page, therefore, can be created in two conceptually different ways, either as a 842x595 media box with 0° (or 180°) rotation or as a 595x842 media box with 90° (or 270°) rotation.
If you instantiate a Document with PageSize.A4.rotate(), iText uses the latter way. (If you had instantiated it with new RectangleReadOnly(842,595), iText would have used the former way.)
PdfReader.getPageSize only inspects the media box. Thus, it returns a rectangle with width 595 for your PDF page with 595x842 media box and 90° rotation.
PdfReader.getPageSizeWithRotation also inspects the page rotation. Thus, it returns a rectangle with width 842 for your PDF page with 595x842 media box and 90° rotation.

how to place text and images in small sized page using iText

I need to make a PDF page that looks something like this:
I'm having problems to make two columns that fit on a small sized page.
This is my code:
public void createSizedPdf(String dest) throws IOException, DocumentException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
document.setMargins(5,5,5,5);
Rectangle one = new Rectangle(290,100);
one.setBackgroundColor(Color.YELLOW);
document.setPageSize(one);
document.open();
Paragraph consigneeName = new Paragraph("Ahmed");
Paragraph address = new Paragraph("Casa ST 121");
String codeBL = "14785236987541";
PdfContentByte cb = writer.getDirectContent();
Barcode128 code128 = new Barcode128();
code128.setBaseline(9);
code128.setSize(9);
code128.setCode(codeBL);
code128.setCodeType(Barcode128.CODE128);
Image code128Image = code128.createImageWithBarcode(cb, null, null);
Paragraph right = new Paragraph();
right.add(consigneeName);
right.add(address);
right.add(code128Image);
Chunk glue = new Chunk(new VerticalPositionMark());
Paragraph p = new Paragraph();
p.add(right);
p.add(new Chunk(glue));
p.add(code128Image);
document.add(p);
document.close();
}

One way to solve your problem, would be to create a template PDF with AcroForm fields. You could create a nice design manually, and then fill out the form programmatically by putting data (text, bar codes) at the appropriate places defined by the fields that act as placeholders.
Another way, is to create the PDF from scratch, which is the approach you seem to have taken, looking at your code.
Your question isn't entirely clear, in the sense that you share your code, but you don't explain the problem you are experiencing. As I already commented:
are you unable to scale images? are you unable to define a smaller
font size? are you unable to create a table with specific dimension?
You say I'm having problems to make two columns that fits in a small
sized page but you forgot to describe the problems.
You didn't give an answer to those questions, and that makes it very hard for someone to answer your question. The only thing a Stack Overflow reader could do, is to do your work in your place. That's not what Stack Overflow is for.
Moreover, the answer to your question is so trivial that it is hard for a Stack Overflow reader to understand why you posted a question.
You say you need to add data (text and bar codes) in two columns, you are actually saying that you want to create a table. This is an example of such a table:
If you look at the SmallTable example, you can see how it's built.
You want a PDF that measures 290 by 100 user units, with a margin of 5 user units on each side. This means that you have space for a table measuring 280 by 90 user units. Looking at your screen shot, I'd say that you have a column of 160 user units with and a column of 120 user units. I'd also say that you have three rows of 30 user units high each.
OK, then why don't you create a table based on those dimensions?
public void createPdf(String dest) throws IOException, DocumentException {
Rectangle small = new Rectangle(290,100);
Font smallfont = new Font(FontFamily.HELVETICA, 10);
Document document = new Document(small, 5, 5, 5, 5);
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
document.open();
PdfPTable table = new PdfPTable(2);
table.setTotalWidth(new float[]{ 160, 120 });
table.setLockedWidth(true);
PdfContentByte cb = writer.getDirectContent();
// first row
PdfPCell cell = new PdfPCell(new Phrase("Some text here"));
cell.setFixedHeight(30);
cell.setBorder(Rectangle.NO_BORDER);
cell.setColspan(2);
table.addCell(cell);
// second row
cell = new PdfPCell(new Phrase("Some more text", smallfont));
cell.setFixedHeight(30);
cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
cell.setBorder(Rectangle.NO_BORDER);
table.addCell(cell);
Barcode128 code128 = new Barcode128();
code128.setCode("14785236987541");
code128.setCodeType(Barcode128.CODE128);
Image code128Image = code128.createImageWithBarcode(cb, null, null);
cell = new PdfPCell(code128Image, true);
cell.setBorder(Rectangle.NO_BORDER);
cell.setFixedHeight(30);
table.addCell(cell);
// third row
table.addCell(cell);
cell = new PdfPCell(new Phrase("and something else here", smallfont));
cell.setBorder(Rectangle.NO_BORDER);
cell.setHorizontalAlignment(Element.ALIGN_RIGHT);
table.addCell(cell);
document.add(table);
document.close();
}
In this example,
you learn how to change the font of the content in a cell,
you learn how to change horizontal and vertical alignment,
you learn how to scale a bar code so that it fits into a cell,
...
All of this functionality is explained in the official documentation. As I said before: you didn't explain the nature of your problem. What wasn't clear in the documentation for you? What is your question?

Changing Font on PDF Rotated Text

I'm using iText to create barcodes on a PDF with the same format as this one:
The problem is the the left number, the first zero digits must be smaller, while the rest of the numbers must also be bold. "T.T.C." also has to be even smaller (it doesn't have to be on another line).
I was able to rotate the number with the following code:
String price = "23000 T.T.C.";
PdfContentByte cb = docWriter.getDirectContent();
PdfTemplate textTemplate = cb.createTemplate(50, 50);
ColumnText columnText = new ColumnText(textTemplate);
columnText.setSimpleColumn(0, 0, 50, 50);
columnText.addElement(new Paragraph(price));
columnText.go();
Image image;
image = Image.getInstance(textTemplate);
image.setAlignment(Image.MIDDLE);
image.setRotationDegrees(90);
doc.add(image);
The problem is that I cannot find a way online to change the font of certain characters of the String price when it is printed on the PDF.

I have created a small Proof of Concept that results in a PDF that looks like this:
As you can see, it has text in different sizes and styles. It also has a bar code that is rotated.
Take a look at the RotatedText example:
public void createPdf(String dest) throws IOException, DocumentException {
// step 1
Document document = new Document(new Rectangle(60, 120), 5, 5, 5, 5);
// step 2
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
// step 3
document.open();
// step 4
PdfContentByte canvas = writer.getDirectContent();
Font big_bold = new Font(FontFamily.HELVETICA, 12, Font.BOLD);
Font small_bold = new Font(FontFamily.HELVETICA, 6, Font.BOLD);
Font regular = new Font(FontFamily.HELVETICA, 6);
Paragraph p1 = new Paragraph();
p1.add(new Chunk("23", big_bold));
p1.add(new Chunk("000", small_bold));
document.add(p1);
Paragraph p2 = new Paragraph("T.T.C.", regular);
p2.setAlignment(Element.ALIGN_RIGHT);
document.add(p2);
BarcodeEAN barcode = new BarcodeEAN();
barcode.setCodeType(Barcode.EAN8);
barcode.setCode("12345678");
Rectangle rect = barcode.getBarcodeSize();
PdfTemplate template = canvas.createTemplate(rect.getWidth(), rect.getHeight() + 10);
ColumnText.showTextAligned(template, Element.ALIGN_LEFT,
new Phrase("DARK GRAY", regular), 0, rect.getHeight() + 2, 0);
barcode.placeBarcode(template, BaseColor.BLACK, BaseColor.BLACK);
Image image = Image.getInstance(template);
image.setRotationDegrees(90);
document.add(image);
Paragraph p3 = new Paragraph("SMALL", regular);
p3.setAlignment(Element.ALIGN_CENTER);
document.add(p3);
// step 5
document.close();
}
This example solves all of your issues:
You want a Paragraph to use different fonts: compose a Paragraph using different Chunk objects.
You want to add extra text on top of a bar code: add the bar code to a PdfTemplate and add the extra text using ColumnText.showTextAligned() (not that you can also compose a Phrase using different Chunk objects if you need more than one font in that extra text).
You want to rotate the bar code: wrap the PdfTemplate inside an Image object and rotate the image.
You can check the result: rotated_text.pdf
I hope this helps.

How do I draw graphics to PDF using iText?

I am trying to complete an example that draws graphics and writes them to PDF, but I keep getting errors that the PDF has no pages. if I add something simple with document.add() after opening it works fine, I just never see the graphics. Here is my code:
Document document = new Document();
PdfWriter writer = new PdfWriter();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition",
" attachment; filename=\"Design.pdf\"");
writer = PdfWriter.getInstance(document, response.getOutputStream());
document.open();
PdfContentByte cb = writer.getDirectContent();
Graphics2D graphics2D = cb.createGraphics(36, 54);
graphics2D.drawString("Hello World", 36, 54);
graphics2D.dispose();
document.close();
Do I have to do something else to add the graphic to the document or is my syntax incorrect?

I am not an expert in IText, but last week I tryed to draw some circles with it. So this is what I have noticed during my tests:
If you draw graphics, you must (or lets say I must when I tryed it) "wrap" the graphics commands in a section starting with saveState() and ending with restoreState(), es well as I needed to invoke fillStroke() -- if I do not invoke fillStroke() then nothing was drawn.
Example
private void circle(float x, float y, PdfWriter writer) {
PdfContentByte canvas = writer.getDirectContent();
canvas.saveState();
canvas.setColorStroke(GrayColor.BLACK);
canvas.setColorFill(GrayColor.BLACK);
canvas.circle(x, y, 2);
canvas.fillStroke();
canvas.restoreState();
}
#Test
public void testPossition() throws DocumentException, IOException {
OutputStream outputStream = FileUtil.openOutputStream("testPosition.pdf");
//this is my personal file util, but it does not anything more
//then creating a file and opening the file stream.
Document document = new Document(PageSize.A4, 50, 50, 50, 50);
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
markPosition(100, 100, writer);
document.add(new Paragraph("Total: 595 x 842 -- 72pt (1 inch)"));
document.close();
outputStream.flush();
outputStream.close();
}
private void markPosition(float x, float y, PdfWriter writer)
throws DocumentException, IOException {
placeChunck("x: " + x + " y: " + y, x, y, writer);
circle(x, y, writer);
}
private void placeChunck(String text, float x, float y, PdfWriter writer)
throws DocumentException, IOException {
PdfContentByte canvas = writer.getDirectContent();
BaseFont font = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
canvas.saveState();
canvas.beginText();
canvas.moveText(x, y);
canvas.setFontAndSize(font, 9);
canvas.showText(text);
canvas.endText();
canvas.restoreState();
}
But PdfContentByte (canvas) has much more functions, for example rectangle.

Does Document doc = new Document(PageSize.A4);
make any difference?
I don't know if you need to add a Paragraph like this:
doc.add(new Paragraph(...));
Also we use doc.add(ImgRaw); to add images.

Without going too far into it, I think your general approach is fine. I think what might be happening here is that the Graphics2D origin is different from the PDF origin, so maybe you need to change the call to drawString() so it uses 0,0 as the location??

I think the problem is that directcontent writes directly to the page object. This way you can add backgrounds or backdrop images. Try adding a new page (doc.newPage()) before writing to the directcontent.

Have you tried drawing operations on the g2d object that just use shapes instead of text? That would eliminate the possibility of something odd going on with font selection or something like that.
iText In Action Chapter 12 has exactly what you are looking for - it really is worth picking up. Preview of Chapter 12

I just put together the following unit test against the latest HEAD of iText:
Document document = new Document();
PdfWriter writer = new PdfWriter();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
writer = PdfWriter.getInstance(document, baos);
document.open();
PdfContentByte cb = writer.getDirectContent();
Graphics2D graphics2D = cb.createGraphics(36, 54);
graphics2D.setColor(Color.black);
graphics2D.drawRect(0, 0, 18, 27);
Font font = new Font("Serif", Font.PLAIN, 10);
graphics2D.setFont(font);
graphics2D.drawString("Yo Adrienne", 0, 54);
graphics2D.dispose();
document.close();
TestResourceUtils.openBytesAsPdf(baos.toByteArray());
And it works fine - I get a small black rectangle in the lower left hand corner of the page, plus text. Note that I am specifying X=0 for my drawString method (you were specifying 36 which causes the text to render outside of the image bounds). Note also that I explicitly specified a font - if I leave that out, it still renders, but it's usually a great idea to not trust the defaults for that sort of thing. Finally, I explicitly set the foreground color - again, not truly necessary, but trusting defaults can be scary.
So I'd have to say that the core issue here was the placement of the text at x=36.
In none of my tests was I able to create an error saying that the PDF has no pages - can you post the stack trace of the exception you are getting?
I can't imagine that adding a paragraph to the document makes any difference to this (that's the sort of bug that would have gotten taken care of long, long ago)

iText - add content to existing PDF file

I want to do the following with iText:
(1) parse an existing PDF file
(2) add some data to it, on the existing single page of the document (such as a timestamp)
(3) write out the document
I just can't seem to figure out how to do this with iText. In pseudo code I would do this:
Document document = reader.read(input);
document.add(new Paragraph("my timestamp"));
writer.write(document, output);
But for some reason iText's API is so dauntingly complicated that I can't wrap my head around it. The PdfReader actually holds the document model or something (rather than spitting out a document), and you need a PdfWriter to read pages from it... eh?

iText has more than one way of doing this. The PdfStamper class is one option. But I find the easiest method is to create a new PDF document then import individual pages from the existing document into the new PDF.
// Create output PDF
Document document = new Document(PageSize.A4);
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
PdfContentByte cb = writer.getDirectContent();
// Load existing PDF
PdfReader reader = new PdfReader(templateInputStream);
PdfImportedPage page = writer.getImportedPage(reader, 1);
// Copy first page of existing PDF into output PDF
document.newPage();
cb.addTemplate(page, 0, 0);
// Add your new data / text here
// for example...
document.add(new Paragraph("my timestamp"));
document.close();
This will read in a PDF from templateInputStream and write it out to outputStream. These might be file streams or memory streams or whatever suits your application.

Gutch's code is close, but it'll only work right if:
There are no annotations (links, fields, etc), no Document Structure/Marked Content, no bookmarks, no document-level script, etc, etc, etc...
The page size happens to be A.4 (decent odds, but it won't work on any ol' PDF you happen to come across)
You don't mind losing all the original document metadata (producer, creation date, possibly author/title/keywords), and maybe the document ID. You can't copy the creation date and doc ID unless you do some pretty deep hackery on iText itself).
The Approved Method is to do it the other way around. Open the existing document with a PdfStamper, and use the returned PdfContentByte from getOverContent() to write text (and whatever else you might need) directly to the page. No second document needed.
And you can use a ColumnText to handle layout and such for you... no need to get down and dirty with beginText(),setFontAndSize(),drawText(),drawText()...,endText().

This is the most complicated scenario I can imagine: I have a PDF file created with Ilustrator and modified with Acrobat to have AcroFields (AcroForm) that I'm going to fill with data with this Java code, the result of that PDF file with the data in the fields is modified adding a Document.
Actually in this case I'm dynamically generating a background that is added to a PDF that is also dynamically generated with a Document with an unknown amount of data or pages.
I'm using JBoss and this code is inside a JSP file (should work in any JSP webserver).
Note: if you are using IExplorer you must submit a HTTP form with POST method to be able to download the file. If not you are going to see the PDF code in the screen. This does not happen in Chrome or Firefox.
<%# page import="java.io.*, com.lowagie.text.*, com.lowagie.text.pdf.*" %><%
response.setContentType("application/download");
response.setHeader("Content-disposition","attachment;filename=listaPrecios.pdf" );
// -------- FIRST THE PDF WITH THE INFO ----------
String str = "";
// lots of words
for(int i = 0; i < 800; i++) str += "Hello" + i + " ";
// the document
Document doc = new Document( PageSize.A4, 25, 25, 200, 70 );
ByteArrayOutputStream streamDoc = new ByteArrayOutputStream();
PdfWriter.getInstance( doc, streamDoc );
// lets start filling with info
doc.open();
doc.add(new Paragraph(str));
doc.close();
// the beauty of this is the PDF will have all the pages it needs
PdfReader frente = new PdfReader(streamDoc.toByteArray());
PdfStamper stamperDoc = new PdfStamper( frente, response.getOutputStream());
// -------- THE BACKGROUND PDF FILE -------
// in JBoss the file has to be in webinf/classes to be readed this way
PdfReader fondo = new PdfReader("listaPrecios.pdf");
ByteArrayOutputStream streamFondo = new ByteArrayOutputStream();
PdfStamper stamperFondo = new PdfStamper( fondo, streamFondo);
// the acroform
AcroFields form = stamperFondo.getAcroFields();
// the fields
form.setField("nombre","Avicultura");
form.setField("descripcion","Esto describe para que sirve la lista ");
stamperFondo.setFormFlattening(true);
stamperFondo.close();
// our background is ready
PdfReader fondoEstampado = new PdfReader( streamFondo.toByteArray() );
// ---- ADDING THE BACKGROUND TO EACH DATA PAGE ---------
PdfImportedPage pagina = stamperDoc.getImportedPage(fondoEstampado,1);
int n = frente.getNumberOfPages();
PdfContentByte background;
for (int i = 1; i <= n; i++) {
background = stamperDoc.getUnderContent(i);
background.addTemplate(pagina, 0, 0);
}
// after this everithing will be written in response.getOutputStream()
stamperDoc.close();
%>
There is another solution much simpler, and solves your problem. It depends the amount of text you want to add.
// read the file
PdfReader fondo = new PdfReader("listaPrecios.pdf");
PdfStamper stamper = new PdfStamper( fondo, response.getOutputStream());
PdfContentByte content = stamper.getOverContent(1);
// add text
ColumnText ct = new ColumnText( content );
// this are the coordinates where you want to add text
// if the text does not fit inside it will be cropped
ct.setSimpleColumn(50,500,500,50);
ct.setText(new Phrase(str, titulo1));
ct.go();

Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document,
new FileOutputStream("E:/TextFieldForm.pdf"));
document.open();
PdfPTable table = new PdfPTable(2);
table.getDefaultCell().setPadding(5f); // Code 1
table.setHorizontalAlignment(Element.ALIGN_LEFT);
PdfPCell cell;
// Code 2, add name TextField
table.addCell("Name");
TextField nameField = new TextField(writer,
new Rectangle(0,0,200,10), "nameField");
nameField.setBackgroundColor(Color.WHITE);
nameField.setBorderColor(Color.BLACK);
nameField.setBorderWidth(1);
nameField.setBorderStyle(PdfBorderDictionary.STYLE_SOLID);
nameField.setText("");
nameField.setAlignment(Element.ALIGN_LEFT);
nameField.setOptions(TextField.REQUIRED);
cell = new PdfPCell();
cell.setMinimumHeight(10);
cell.setCellEvent(new FieldCell(nameField.getTextField(),
200, writer));
table.addCell(cell);
// force upper case javascript
writer.addJavaScript(
"var nameField = this.getField('nameField');" +
"nameField.setAction('Keystroke'," +
"'forceUpperCase()');" +
"" +
"function forceUpperCase(){" +
"if(!event.willCommit)event.change = " +
"event.change.toUpperCase();" +
"}");
// Code 3, add empty row
table.addCell("");
table.addCell("");
// Code 4, add age TextField
table.addCell("Age");
TextField ageComb = new TextField(writer, new Rectangle(0,
0, 30, 10), "ageField");
ageComb.setBorderColor(Color.BLACK);
ageComb.setBorderWidth(1);
ageComb.setBorderStyle(PdfBorderDictionary.STYLE_SOLID);
ageComb.setText("12");
ageComb.setAlignment(Element.ALIGN_RIGHT);
ageComb.setMaxCharacterLength(2);
ageComb.setOptions(TextField.COMB |
TextField.DO_NOT_SCROLL);
cell = new PdfPCell();
cell.setMinimumHeight(10);
cell.setCellEvent(new FieldCell(ageComb.getTextField(),
30, writer));
table.addCell(cell);
// validate age javascript
writer.addJavaScript(
"var ageField = this.getField('ageField');" +
"ageField.setAction('Validate','checkAge()');" +
"function checkAge(){" +
"if(event.value < 12){" +
"app.alert('Warning! Applicant\\'s age can not" +
" be younger than 12.');" +
"event.value = 12;" +
"}}");
// add empty row
table.addCell("");
table.addCell("");
// Code 5, add age TextField
table.addCell("Comment");
TextField comment = new TextField(writer,
new Rectangle(0, 0,200, 100), "commentField");
comment.setBorderColor(Color.BLACK);
comment.setBorderWidth(1);
comment.setBorderStyle(PdfBorderDictionary.STYLE_SOLID);
comment.setText("");
comment.setOptions(TextField.MULTILINE |
TextField.DO_NOT_SCROLL);
cell = new PdfPCell();
cell.setMinimumHeight(100);
cell.setCellEvent(new FieldCell(comment.getTextField(),
200, writer));
table.addCell(cell);
// check comment characters length javascript
writer.addJavaScript(
"var commentField = " +
"this.getField('commentField');" +
"commentField" +
".setAction('Keystroke','checkLength()');" +
"function checkLength(){" +
"if(!event.willCommit && " +
"event.value.length > 100){" +
"app.alert('Warning! Comment can not " +
"be more than 100 characters.');" +
"event.change = '';" +
"}}");
// add empty row
table.addCell("");
table.addCell("");
// Code 6, add submit button
PushbuttonField submitBtn = new PushbuttonField(writer,
new Rectangle(0, 0, 35, 15),"submitPOST");
submitBtn.setBackgroundColor(Color.GRAY);
submitBtn.
setBorderStyle(PdfBorderDictionary.STYLE_BEVELED);
submitBtn.setText("POST");
submitBtn.setOptions(PushbuttonField.
VISIBLE_BUT_DOES_NOT_PRINT);
PdfFormField submitField = submitBtn.getField();
submitField.setAction(PdfAction
.createSubmitForm("",null, PdfAction.SUBMIT_HTML_FORMAT));
cell = new PdfPCell();
cell.setMinimumHeight(15);
cell.setCellEvent(new FieldCell(submitField, 35, writer));
table.addCell(cell);
// Code 7, add reset button
PushbuttonField resetBtn = new PushbuttonField(writer,
new Rectangle(0, 0, 35, 15), "reset");
resetBtn.setBackgroundColor(Color.GRAY);
resetBtn.setBorderStyle(
PdfBorderDictionary.STYLE_BEVELED);
resetBtn.setText("RESET");
resetBtn
.setOptions(
PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT);
PdfFormField resetField = resetBtn.getField();
resetField.setAction(PdfAction.createResetForm(null, 0));
cell = new PdfPCell();
cell.setMinimumHeight(15);
cell.setCellEvent(new FieldCell(resetField, 35, writer));
table.addCell(cell);
document.add(table);
document.close();
}
class FieldCell implements PdfPCellEvent{
PdfFormField formField;
PdfWriter writer;
int width;
public FieldCell(PdfFormField formField, int width,
PdfWriter writer){
this.formField = formField;
this.width = width;
this.writer = writer;
}
public void cellLayout(PdfPCell cell, Rectangle rect,
PdfContentByte[] canvas){
try{
// delete cell border
PdfContentByte cb = canvas[PdfPTable
.LINECANVAS];
cb.reset();
formField.setWidget(
new Rectangle(rect.left(),
rect.bottom(),
rect.left()+width,
rect.top()),
PdfAnnotation
.HIGHLIGHT_NONE);
writer.addAnnotation(formField);
}catch(Exception e){
System.out.println(e);
}
}
}

how-to-update-a-pdf-without-creating-a-new-pdf
iText 7, please pay attention to version
PdfReader reader = new PdfReader(src);
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdfDoc = new PdfDocument(reader, writer);
//manipulate pdf…
pdfDoc.close();