I have a huge string of text that is apparently raw data for a PDF file, and I need to make it back into a PDF.
Currently I'm reading the string into a StringBuffer but if I need to I can change that. From there I have tried just writing it out to a file and changing the extension (I really hoped that worked, but I kinda knew it wouldn't), I've tried taking it to a String then getting a byte[] out of it and writing that to the file or using a DataOutputStream to put the bytes into the file. None of these has seemed to work.
I've also tried using the iText plugin, I tried just writing it to a pdf through that and I also tried reading the text as a pdf and then copying it page by page to a new pdf. Neither of these have returned very good results.
It's Friday afternoon, I'm tapped, any suggestions will be a huge help!
Okay, well after a lot of research I found out that to preserve the binary data in the string that typically you convert it to Base64 encoding. On a complete guess I decoded the string out of Base64 and dropped the bytes into the pdf file, and lo and behold I had a pdf that could be opened!
Thanks for the answers and I hope this helps someone in the future!
A PDF is a binary object. You need to write the bytes directly to a file.
Turning into text will probably break it. Does it start with %%PDF- and end with %%EOF?
How did you come across this string? If it is a raw ASCII string, you will be missing a large amount of binary data that is embedded within the PDF.
If you have a unicode string, you may be able to write it to a file directly using an OutputStream (not a Writer as you don't actually want to write character data).
The iText approach is the right one. You can do something like this :
import java.io.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
public class TextFileToPDF {
/*
ex. java TextFileToPDF c:\temp\text.txt c:\temp\text.pdf
*/
public static void main (String [] args){
BufferedReader input = null;
Document output = null;
System.out.println("Convert text file to pdf");
System.out.println("input : " + args[0]);
System.out.println("output : " + args[1]);
try {
// text file to convert to pdf as args[0]
input =
new BufferedReader (new FileReader(args[0]));
// letter 8.5x11
// see com.lowagie.text.PageSize for a complete list of page-size constants.
output = new Document(PageSize.LETTER, 40, 40, 40, 40);
// pdf file as args[1]
PdfWriter.getInstance(output, new FileOutputStream (args[1]));
output.open();
output.addAuthor("RealHowTo");
output.addSubject(args[0]);
output.addTitle(args[0]);
String line = "";
while(null != (line = input.readLine())) {
System.out.println(line);
Paragraph p = new Paragraph(line);
p.setAlignment(Element.ALIGN_JUSTIFIED);
output.add(p);
}
System.out.println("Done.");
output.close();
input.close();
System.exit(0);
}
catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
}
