Extract Paragraph from PDF

Extract Text from PDF document in Paragraphs form

We can get text from a PDF document by searching a particular text (using “plain text” or “regular expressions”) from a single page or whole document, or we can get the complete text of a single page, range of pages or complete document. However, in some cases, you require to extract paragraphs from a PDF document or text in the form of Paragraphs. We have implemented functionality for searching sections and paragraphs in the text of PDF document pages. We have introduced ParagraphAbsorber Class (like TextFragmentAbsorber and TextAbsorber), which can be used to extract paragraphs from PDF documents. There are two following ways in which you can use ParagraphAbsorber:

1- By drawing the border of sections and paragraphs of text on PDF page:

public static void ExtractParagraph() {
    // The path to the documents directory.
    Document doc = new Document(_dataDir + "input.pdf");
    Page page = doc.getPages().get_Item(2);

    ParagraphAbsorber absorber = new ParagraphAbsorber();
    absorber.visit(page);

    PageMarkup markup = absorber.getPageMarkups().get(0);

    for (MarkupSection section : markup.getSections()) {
        DrawRectangleOnPage(section.getRectangle(), page);
        for (MarkupParagraph paragraph : section.getParagraphs()) {
            DrawPolygonOnPage(paragraph.getPoints(), page);
        }
    }

    doc.save(_dataDir + "output_out.pdf");
}

private static void DrawRectangleOnPage(Rectangle rectangle, Page page) {
    page.getContents().add(new GSave());
    page.getContents().add(new ConcatenateMatrix(1, 0, 0, 1, 0, 0));
    page.getContents().add(new SetRGBColorStroke(0, 1, 0));
    page.getContents().add(new SetLineWidth(2));
    page.getContents().add(new Re(rectangle.getLLX(), rectangle.getLLY(), rectangle.getWidth(), rectangle.getHeight()));
    page.getContents().add(new ClosePathStroke());
    page.getContents().add(new GRestore());
}

private static void DrawPolygonOnPage(Point[] polygon, Page page) {
    page.getContents().add(new GSave());
    page.getContents().add(new ConcatenateMatrix(1, 0, 0, 1, 0, 0));
    page.getContents().add(new SetRGBColorStroke(0, 0, 1));
    page.getContents().add(new SetLineWidth(1));
    page.getContents().add(new MoveTo(polygon[0].getX(), polygon[0].getY()));
    for (int i = 1; i < polygon.length; i++) {
        page.getContents().add(new LineTo(polygon[i].getX(), polygon[i].getY()));
    }
    page.getContents().add(new LineTo(polygon[0].getX(), polygon[0].getY()));
    page.getContents().add(new ClosePathStroke());
    page.getContents().add(new GRestore());
}

2- By iterating through paragraphs collection and get the text of them:

public static void ExtractParagraph02() {
        // Open an existing PDF file
        Document doc = new Document(_dataDir + "input.pdf");
        // Instantiate ParagraphAbsorber
        ParagraphAbsorber absorber = new ParagraphAbsorber();
        absorber.visit(doc);

        for (PageMarkup markup : absorber.getPageMarkups()) {
            int i = 1;
            for (MarkupSection section : markup.getSections()) {
                int j = 1;

                for (MarkupParagraph paragraph : section.getParagraphs()) {
                    StringBuilder paragraphText = new StringBuilder();

                    for (java.util.List<TextFragment> line : paragraph.getLines()) {
                        for (TextFragment fragment : line) {
                            paragraphText.append(fragment.getText());
                        }
                        paragraphText.append("\r\n");
                    }
                    paragraphText.append("\r\n");

                    System.out.println("Paragraph "+j+" of section "+ i + " on page"+ ":"+markup.getNumber());
                    System.out.println(paragraphText.toString());

                    j++;
                }
                i++;
            }
        }
    }