D-Net

import javax.servlet.ServletOutputStream;

import org.apache.pdfbox.pdmodel.font.PDTrueTypeFont;

import org.springframework.core.io.ClassPathResource;

	private ClassPathResource trueType = new ClassPathResource("/eu/dnetlib/data/provision/pdf/lmroman10-regular.ttf");

		List<String> arrayList = new ArrayList<String>();

		arrayList.add(getTextToPrint(id));

		writeText(arrayList, response.getOutputStream());

	}

	public void writeText(final List<String> arrayList, final ServletOutputStream outputStream) throws IOException,

	COSVisitorException {

		PDDocument document = new PDDocument();

		PDPage page = new PDPage();

		// PDFont font = PDType1Font.HELVETICA;

		PDFont font = PDTrueTypeFont.loadTTF(document, trueType.getInputStream());

		int positionX = 30;

		int positionY = 750;

		document.addPage(page);

		// Start a new content stream

		PDPageContentStream contentStream = new PDPageContentStream(document, page);

		// Define a text content stream using the selected font, moving the cursor and drawing the text in arrayList

		for (int i = 0; i < arrayList.size(); i++) {

			String text = arrayList.get(i);

			String[] tmpText = splitString(text);

			for (int k = 0; k < tmpText.length; k++) {

				contentStream.beginText();

				contentStream.setFont(font, 12);

				contentStream.moveTextPositionByAmount(positionX, positionY);

				contentStream.drawString(tmpText[k]);

				contentStream.endText();

				positionY = positionY - 20;

			contentStream.setLineWidth((float) 0.25);

		}

		// Make sure that the content stream is closed:

		contentStream.close();

		document.save(outputStream);

		document.close();

	}

	public String[] splitString(final String text) {

		/*

		 * pdfBox doesnt support linebreaks. Therefore, following steps are requierd to automatically put linebreaks in the pdf 1) split

		 * each word in string that has to be linefeded and put them into an array of string, e.g. String [] parts 2) create an array of

		 * stringbuffer with (textlength/(number of characters in a line)), e.g. 280/70=5 >> we need 5 linebreaks! 3) put the parts into the

		 * stringbuffer[i], until the limit of maximum number of characters in a line is allowed, 4) loop until stringbuffer.length <

		 * linebreaks

		 */

		int linebreaks = text.length() / 40; // how many linebreaks do I need?

		String[] newText = new String[linebreaks + 1];

		String tmpText = text;

		String[] parts = tmpText.split(" "); // save each word into an array-element

		// split each word in String into a an array of String text.

		StringBuffer[] stringBuffer = new StringBuffer[linebreaks + 1]; // StringBuffer is necessary because of manipulating text

		int i = 0; // initialize counter

		int totalTextLength = 0;

		for (int k = 0; k < linebreaks + 1; k++) {

			stringBuffer[k] = new StringBuffer();

			while (true) {

				if (i >= parts.length)

				{

					break; // avoid NullPointerException

				}

				totalTextLength = totalTextLength + parts[i].length(); // count each word in String

				if (totalTextLength > 40)

				{

					break; // put each word in a stringbuffer until string length is >80

				}

				stringBuffer[k].append(parts[i]);

				stringBuffer[k].append(" ");

				i++;

			// reset counter, save linebreaked text into the array, finally convert it to a string

			totalTextLength = 0;

			newText[k] = stringBuffer[k].toString();

		return newText;