How to replace string in existing pdf using pdfbox?

Question

My requirement:
Your loan amount @loanamount is approved.
I wanted to replace @loanamount to 5,00,000. If i try with pdfbox api,i am not able to replace. i am getting empty space in pdf.
If i use same api and if try to replace @loanamount to abcd. now its replacing
replaceFirst("@loanamount","5,00,00"); - not able to replace. getting empty content in pdf
public void replaceString()
PDDocument doc = null;
try {     
doc = PDDocument.load("D:/DOCS/Letter.pdf"); //Input PDF File Name
List pages = doc.getDocumentCatalog().getAllPages();
for (int i = 0; i < pages.size(); i++)
PDPage page = (PDPage) pages.get(i);
PDStream contents = page.getContents();
PDFStreamParser parser = new PDFStreamParser(contents.getStream());
parser.parse();
List tokens = parser.getTokens();
for (int j = 0; j < tokens.size(); j++)
Object next = tokens.get(j);
if (next instanceof PDFOperator)
PDFOperator op = (PDFOperator) next;
// Tj and TJ are the two operators that display strings in a PDF
if (op.getOperation().equals("Tj"))
// Tj takes one operator and that is the string
// to display so lets update that operator
COSString previous = (COSString) tokens.get(j - 1);
System.out.println("COSString::"+previous);
String string = previous.getString();
string = string.replaceFirst("@loanamount", "5,00,000");
//Word you want to change. Currently this code changes word "Solr" to "Solr123"
previous.reset();
previous.append(string.getBytes());
PDStream updatedStream = new PDStream(doc);
OutputStream out = updatedStream.createOutputStream();
ContentStreamWriter tokenWriter = new ContentStreamWriter(out);
tokenWriter.writeTokens(tokens);
System.out.println("updatedStream::"+updatedStream.getInputStreamAsString());
page.setContents(updatedStream);
//setItem(COSName.CONTENTS,updatedStream);
doc.save("D:/DOCS/loanamt_filled.pdf"); //Output file name
sample content in pdf:
Dear ABC,
Your loan amount @loanamount is approved.
Regards,
DEF
Output:Your loan amount is approved.
I m getting empty spaces instead of @loanamount
Could anyone help me out ?
Please suggest me java open source api to replace caption or content in existing pdf.
Thanks in advance...

Answer 1

Tom
To answer your original question, I know of now easy way of processing your clips and replacing the existing ones already edited.
If I have this right you have your sequence fully edited?
There is a workaround, messy and time consuming but it will not spoil the video element of the sequence.
Process: -
Drag the audio for each clip so that it is on a track with space at either end of it.
Unlink each clip.
For every audio clip extend each audio's head and tail
Then use the edit in Audition link
The clips are individually processed
Then you can go back adjust the head and tail to what you want and fade out and in as you wish.
I'd manually fade each clip rather than add an audio transition
Take care not to alter the video clips at any time or you will go out of sync
Hope this helps
Col