Essentially, I am attempting to create a small tool in Java where I take the text from some kind of user input, think of an ordinary text box, and create a PDF file with it.
So far, I managed to scrape something really quickly with my barebones knowledge of PDFBox.
In my application, I am instantiating this class(the one shown below) in another one with GUI elements and if I input text, in let's say a text box, and running this PDFLetter script once - it works like a charm but running it a second time, it crashes and gives me this annoying error:
COSStream has been closed and cannot be read. Perhaps it's enclosing PDDocument has been closed?
I do not really see any way that I could trigger this error in my code. I thought it had something to do with my rudimentary 'jump to next page' solution but it works in its current state, so I do not know what to believe anymore.
The way I am instantiating the class, in case you need to know, is like this:
PDFLetter.PDFLetterGenerate(textInput.getValue().toString());
Additionally, I thought it had to be some kind of a problem with garbage collection that triggered the problem but I no longer think that this is the case.
public class PDFLetter {
private static final int PAGE_MARGIN = 80;
static float TABLE_HEIGHT;
static Boolean newPage = false;
public static String text = // null;
"Ding Dong ding dong Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et "
+ "Imperdiet dui accumsan sit amet. Risus in hendrerit gravida rutrum quisque non tellus orci ac.";
static List<String> textList = new ArrayList<String>();
PDDocument document = new PDDocument();
static PDPage main_page = new PDPage();
static PDPage new_page = new PDPage();
static File file = new File("C:/PDFTests/temp.pdf");
public void PDFLetterGenerate (String args) throws Exception {
text = args;
text = text.replace("\n", "").replace("\r", "");
if(file.exists()) file.delete();
file.createNewFile();
//Creating PDF document object
PDDocument document = new PDDocument();
document.addPage(main_page);
mainBody(document, main_page);
document.addPage(new_page);
if(!newPage) document.removePage(new_page);
document.save(file);
document.close();
}
public static void mainBody(PDDocument doc, PDPage page) throws Exception {
final float width = page.getMediaBox().getWidth()-(2*PAGE_MARGIN);
int fontSize = 11;
float leading = 1.5f * fontSize;
final float max = 256;
PDFont pdfFont = PDType1Font.HELVETICA;
@SuppressWarnings("deprecation")
PDPageContentStream contentStream = new PDPageContentStream(doc, page, true, true);
int lastSpace = -1;
while (text.length() > 0){
int spaceIndex = text.indexOf(' ', lastSpace + 1);
if (spaceIndex < 0) spaceIndex = text.length();
String subString = text.substring(0, spaceIndex);
float size = fontSize * pdfFont.getStringWidth(subString) / 1000;
if (size > width){
if (lastSpace < 0) lastSpace = spaceIndex;
subString = text.substring(0, lastSpace);
textList.add(subString);
text = text.substring(lastSpace).trim();
lastSpace = -1;
}
else if (spaceIndex == text.length()){
textList.add(text);
text = "";
}
else{
lastSpace = spaceIndex;
}
}
contentStream.beginText();
contentStream.setFont(pdfFont, fontSize);
contentStream.newLineAtOffset(PAGE_MARGIN, TABLE_HEIGHT);
@SuppressWarnings("deprecation")
PDPageContentStream newStream = new PDPageContentStream(doc, new_page, true, true);
int nextPage_i = 0;
for (int i=0; i<textList.size(); i++)//String line: textList){
System.out.println("HEIGHT: "+ TABLE_HEIGHT);
nextPage_i = i;
String line = textList.get(i);
float charSpacing = 0;
if (line.length() > 1){
float size = fontSize * pdfFont.getStringWidth(line) / 1000;
float free = width - size;
if (free > 0){
charSpacing = free / (line.length() - 1);
}
TABLE_HEIGHT = TABLE_HEIGHT - 10;
}
contentStream.setCharacterSpacing(charSpacing);
contentStream.showText(line);
contentStream.newLineAtOffset(0, -leading);
if(TABLE_HEIGHT <= 280){
contentStream.endText();
contentStream.close();
newPage = true;
break;
}
}
if(!newPage){
contentStream.endText();
contentStream.close();
}
else if (newPage){
float NEW_HEIGHT = 600;
newStream.beginText();
newStream.setFont(pdfFont, fontSize);
newStream.newLineAtOffset(PAGE_MARGIN, NEW_HEIGHT);
for (int j=nextPage_i; j<textList.size(); j++)//String line: textList){
System.out.println("HEIGHT: "+ NEW_HEIGHT);
nextPage_i = j;
String line = textList.get(j);
float charSpacing = 0;
if (line.length() > 1){
float size = fontSize * pdfFont.getStringWidth(line) / 1000;
float free = width - size;
if (free > 0)
{
charSpacing = free / (line.length() - 1);
}
NEW_HEIGHT = NEW_HEIGHT - 10;
}
newStream.setCharacterSpacing(charSpacing);
newStream.showText(line);
newStream.newLineAtOffset(0, -leading);
}
newStream.endText();
newStream.close();
}
lastSpace = -1;
}
