Develop Reference

While converting a PDF to regular text using PDFBox, how can I surround superscript text with braces?

Using PDFBox I want to convert a very large PDF file into regular text. I would like to mark any supertext with braces. Being relatively new to PDFBox, how can I surround superscript text with braces?
Example:
PDF: This is text with the X being superscript.
Output: This is text with the (X) being superscript.
Hope you can help. I have seen this post, but that one does not give an easy approach.
My code so far is:
try (PDDocument document = PDDocument.load( new File("files/my-input.pdf"));
FileWriter fileWriter = new FileWriter( "files/my-output.txt")) {
PDFTextStripper tStripper = new PDFTextStripper();
int numberOfPages = document.getNumberOfPages();
for( int i = 1; i <= numberOfPages; i++) {
tStripper.setStartPage(i);
tStripper.setEndPage(i);
tStripper.writeText( document, fileWriter);
fileWriter.flush();
}
}
Subclassing the PDFTextStripper class and simply overruling the writeString() does not work because it will interfere with the original method. The string.getHeight() shows the heigth of the character - so could be used.

How to copy/move AcroForm fields from one document to new blank one using IText5 or IText7?

I need to copy whole AcroForm including field positions and values from template PDF to a new blank PDF file. How can I do that?
In short words - I need to get rid of "background" from the template and leave only filed forms.
The whole point of this is to create a PDF with content that would be printed on pre-printed templates.
I am using IText 5 but I can switch to 7 if usefull examples would be provided

After a lot of trial and error I have found the solution to "How to copy AcfroForm fields into another PDF". It is a iText v7 version. I hope it will help somebody someday.
private byte[] copyFormElements(byte[] sourceTemplate) throws IOException {
PdfReader completeReader = new PdfReader(new ByteArrayInputStream(sourceTemplate));
PdfDocument completeDoc = new PdfDocument(completeReader);
ByteArrayOutputStream out = new ByteArrayOutputStream();
PdfWriter offsetWriter = new PdfWriter(out);
PdfDocument offsetDoc = new PdfDocument(offsetWriter);
offsetDoc.initializeOutlines();
PdfPage blank = offsetDoc.addNewPage();
PdfAcroForm originalForm = PdfAcroForm.getAcroForm(completeDoc, false);
// originalForm.getPdfObject().copyTo(offsetDoc,false);
PdfAcroForm offsetForm = PdfAcroForm.getAcroForm(offsetDoc, true);
for (String name : originalForm.getFormFields().keySet()) {
PdfFormField field = originalForm.getField(name);
PdfDictionary copied = field.getPdfObject().copyTo(offsetDoc, false);
PdfFormField copiedField = PdfFormField.makeFormField(copied, offsetDoc);
offsetForm.addField(copiedField, blank);
}
offsetDoc.close();
completeDoc.close();
return out.toByteArray();
}

Did you check the PdfCopyForms object:
Allows you to add one (or more) existing PDF document(s) to create a new PDF and add the form of another PDF document to this new PDF.
I didn't find an example, but you could try something like this:
PdfReader reader1 = new PdfReader(src1); // a document with a form
PdfReader reader2 = new PdfReader(src2); // a document without a form
PdfCopyForms copy = new PdfCopyForms(new FileOutputStream(dest));
copy.AddDocument(reader1); // add the document without the form
copy.CopyDocumentFields(reader2); // add the fields of the document with the form
copy.close();
reader1.close();
reader2.close();
I see that the class is deprecated. I'm not sure of that's because iText 7 makes it much easier to do this, or if it's because there were technical problems with the class.

Create new pdf in loop with iText Java

I want to create a new pdf for each iteration of the loop so i wrote the below code in java:
PdfWriter writer;
PdfDocument pdf;
Document document;
int i=0;
while(condition){
writer = new PdfWriter("test_"+Integer.toString(i)+".pdf");
pdf = new PdfDocument(writer);
document = new Document(pdf);
//content code here
document.close()
i++;
}
i get the below exception on the line of the document.close() command:
Exception in thread "main" com.itextpdf.kernel.PdfException: Pdf
indirect object belongs to other PDF document. Copy object to current
pdf document. at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:184)
at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:174)
at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:104)
at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:176)
at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:104)
at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:176)
at
com.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:104)
at com.itextpdf.kernel.pdf.PdfWriter.writeToBody(PdfWriter.java:335)
at com.itextpdf.kernel.pdf.PdfWriter.flushObject(PdfWriter.java:243)
at
com.itextpdf.kernel.pdf.PdfDocument.flushObject(PdfDocument.java:1446)
at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:155) at
com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:128) at
com.itextpdf.kernel.pdf.PdfObjectWrapper.flush(PdfObjectWrapper.java:96)
at com.itextpdf.kernel.pdf.PdfPage.flush(PdfPage.java:489) at
com.itextpdf.kernel.pdf.PdfPage.flush(PdfPage.java:448) at
com.itextpdf.kernel.pdf.PdfDocument.close(PdfDocument.java:739) at
com.itextpdf.layout.Document.close(Document.java:120) at
gr.moh.Pdf.main(Pdf.java:224)
i have tried a lot but i cannot find why i get an error. If i do it without a loop it works. Any help?
P.S: i use itext 7

I had the below code out of the loop and it should be into the loop...
PdfFont normalFont = PdfFontFactory.createFont(fontDirectory.getAbsolutePath()+"\\arial.ttf", "Identity-H", true);
normal.setFont(normalFont).setFontSize(14);
Style red = new Style();
PdfFont redFont = PdfFontFactory.createFont(fontDirectory.getAbsolutePath()+"\\arial.ttf", "Identity-H", true);
red.setFont(redFont).setFontSize(14).setFontColor(Color.RED);
Style big = new Style();
PdfFont bigFont = PdfFontFactory.createFont(fontDirectory.getAbsolutePath()+"\\arial.ttf", "Identity-H", true);
big.setFont(bigFont).setFontSize(18).setBold();

Converting a pdf to word document using java

I've successfully converted JPEG to Pdf using Java, but don't know how to convert Pdf to Word using Java, the code for converting JPEG to Pdf is given below.
Can anyone tell me how to convert Pdf to Word (.doc/ .docx) using Java?
import java.io.FileOutputStream;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.Document;
public class JpegToPDF {
public static void main(String[] args) {
try {
Document convertJpgToPdf = new Document();
PdfWriter.getInstance(convertJpgToPdf, new FileOutputStream(
"c:\\java\\ConvertImagetoPDF.pdf"));
convertJpgToPdf.open();
Image convertJpg = Image.getInstance("c:\\java\\test.jpg");
convertJpgToPdf.add(convertJpg);
convertJpgToPdf.close();
System.out.println("Successfully Converted JPG to PDF in iText");
} catch (Exception i1) {
i1.printStackTrace();
}
}
}

In fact, you need two libraries. Both libraries are open source. The first one is iText, it is used to extract the text from a PDF file. The second one is POI, it is ued to create the word document.
The code is quite simple:
//Create the word document
XWPFDocument doc = new XWPFDocument();
// Open the pdf file
String pdf = "myfile.pdf";
PdfReader reader = new PdfReader(pdf);
PdfReaderContentParser parser = new PdfReaderContentParser(reader);
// Read the PDF page by page
for (int i = 1; i <= reader.getNumberOfPages(); i++) {
TextExtractionStrategy strategy = parser.processContent(i, new SimpleTextExtractionStrategy());
// Extract the text
String text=strategy.getResultantText();
// Create a new paragraph in the word document, adding the extracted text
XWPFParagraph p = doc.createParagraph();
XWPFRun run = p.createRun();
run.setText(text);
// Adding a page break
run.addBreak(BreakType.PAGE);
}
// Write the word document
FileOutputStream out = new FileOutputStream("myfile.docx");
doc.write(out);
// Close all open files
out.close();
reader.close();
Beware: With the used extraction strategy, you will lose all formatting. But you can fix this, by inserting your own, more complex extraction strategy.

You can use 7-pdf library
have a look at this it may help :
http://www.7-pdf.de/sites/default/files/guide/manuals/library/index.html
PS: itext has some issues when given file is non RGB image, try this out!!

Although it's far from being a pure Java solution OpenOffice/LibreOfffice allows one to connect to it through a TCP port; it's possible to use that to convert documents. If this looks like an acceptable solution, JODConverter can help you.

Remove page from PDF

I'm currently using iText and I'm wondering if there is a way to delete a page from a PDF file?
I have opened it up with a reader etc., and I want to remove a page before it is then saved back to a new file; how can I do that?

The 'better' way to 'delete' pages is doing
reader.selectPages("1-5,10-12");
Which means we only select pages 1-5, 10-12 effectively 'deleting' pages 6-9.

Get the reader of existing pdf file by
PdfReader pdfReader = new PdfReader("source pdf file path");
Now update the reader by
pdfReader.selectPages("1-5,15-20");
then get the pdf stamper object to write the changes into a file by
PdfStamper pdfStamper = new PdfStamper(pdfReader,
new FileOutputStream("destination pdf file path"));
close the PdfStamper by
pdfStamper.close();
It will close the PdfReader too.
Cheers.....

For iText 7 I found this example:
PdfReader pdfReader = new PdfReader(PATH + name + ".pdf");
PdfDocument srcDoc = new PdfDocument(pdfReader);
PdfDocument resultDoc = new PdfDocument(new PdfWriter(PATH + name + "_cut.pdf"));
resultDoc.initializeOutlines();
srcDoc.copyPagesTo(1, 2, resultDoc);
resultDoc.close();
srcDoc.close();
See also here: clone-reordering-pages
and here: clone-splitting-pdf-file

You can use a PdfStamper in combination with PdfCopy.
In this answer it is explained how to copy a whole document. If you change the criteria for the loop in the sample code you can remove the pages you don't need.

Here is a removing function ready for real life usage. Proven to work ok with itext 2.1.7. It does not use "strigly typing" also.
/**
* Removes given pages from a document.
* #param reader document
* #param pagesToRemove pages to remove; 1-based
*/
public static void removePages(PdfReader reader, int... pagesToRemove) {
int pagesTotal = reader.getNumberOfPages();
List<Integer> allPages = new ArrayList<>(pagesTotal);
for (int i = 1; i <= pagesTotal; i++) {
allPages.add(i);
}
for (int page : pagesToRemove) {
allPages.remove(new Integer(page));
}
reader.selectPages(allPages);
}