highlight text using pdfbox when it's location in the pdf is known

问题

Does pdfbox provide some utility to highlight the text when I have it's co-ordinates?

Bounds of the text is known.

I know there are other libraries that provide the same functionality like pdfclown etc. But does pdfbox provide something like that?

回答1:

well i found this out. it is simple.

PDDocument doc = PDDocument.load(/*path to the file*/);
PDPage page = (PDPage)doc.getDocumentCatalog.getAllPages.get(i);
List annots = page.getAnnotations;
PDAnnotationTextMarkup markup = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.Su....);
markup.setRectangle(/*your PDRectangle*/);
markup.setQuads(/*float array of size eight with all the vertices of the PDRectangle in anticlockwise order*/);
annots.add(markup);
doc.save(/*path to the output file*/);

回答2:

This is an extended answer from the number 1 here, and basically is the same code as above.

Improves the coordinates points in respect to the page size in the current document, as well the yellow color that is very lighter and sometimes if the word is short and smaller is difficult to see.

Also highlight the full word taking the X, Y coordinates from the top-left to the top-right. Takes the coordinates from the first character and from the last one in the string.

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.List;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationTextMarkup;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.text.TextPosition;

public class MainSource extends PDFTextStripper {

    public MainSource()  throws IOException {
        super();
    }

    public static void main(String[] args)  throws IOException {
        PDDocument document = null;
        String fileName = "C:/AnyPDFFile.pdf";
        try {
            document = PDDocument.load( new File(fileName) );
            PDFTextStripper stripper = new MainSource();
            stripper.setSortByPosition( true );

            stripper.setStartPage( 0 );
            stripper.setEndPage( document.getNumberOfPages() );

            Writer dummy = new OutputStreamWriter(new ByteArrayOutputStream());
            stripper.writeText(document, dummy);

            File file1 = new File("C:/AnyPDFFile-New.pdf");
            document.save(file1);
        }
        finally {
            if( document != null ) {
                document.close();
            }
        }
    }

    /**
     * Override the default functionality of PDFTextStripper.writeString()
     */

    @Override
    protected void writeString(String string, List<TextPosition> textPositions) throws IOException {
        boolean isFound = false;
        float posXInit  = 0, 
              posXEnd   = 0, 
              posYInit  = 0,
              posYEnd   = 0,
              width     = 0, 
              height    = 0, 
              fontHeight = 0;
        String[] criteria = {"Word1", "Word2", "Word3", ....};

        for (int i = 0; i < criteria.length; i++) {
            if (string.contains(criteria[i])) {
                isFound = true;
            } 
        }
        if (isFound) {
            posXInit = textPositions.get(0).getXDirAdj();
            posXEnd  = textPositions.get(textPositions.size() - 1).getXDirAdj() + textPositions.get(textPositions.size() - 1).getWidth();
            posYInit = textPositions.get(0).getPageHeight() - textPositions.get(0).getYDirAdj();
            posYEnd  = textPositions.get(0).getPageHeight() - textPositions.get(textPositions.size() - 1).getYDirAdj();
            width    = textPositions.get(0).getWidthDirAdj();
            height   = textPositions.get(0).getHeightDir();

            System.out.println(string + "X-Init = " + posXInit + "; Y-Init = " + posYInit + "; X-End = " + posXEnd + "; Y-End = " + posYEnd + "; Font-Height = " + fontHeight);

            /* numeration is index-based. Starts from 0 */

            float quadPoints[] = {posXInit, posYEnd + height + 2, posXEnd, posYEnd + height + 2, posXInit, posYInit - 2, posXEnd, posYEnd - 2};

            List<PDAnnotation> annotations = document.getPage(this.getCurrentPageNo() - 1).getAnnotations();
            PDAnnotationTextMarkup highlight = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.SUB_TYPE_HIGHLIGHT);

            PDRectangle position = new PDRectangle();
            position.setLowerLeftX(posXInit);
            position.setLowerLeftY(posYEnd);
            position.setUpperRightX(posXEnd);
            position.setUpperRightY(posYEnd + height);

            highlight.setRectangle(position);

            // quadPoints is array of x,y coordinates in Z-like order (top-left, top-right, bottom-left,bottom-right) 
            // of the area to be highlighted

            highlight.setQuadPoints(quadPoints);

            PDColor yellow = new PDColor(new float[]{1, 1, 1 / 255F}, PDDeviceRGB.INSTANCE);
            highlight.setColor(yellow);
            annotations.add(highlight);
        }
    }

}

回答3:

This works for pdfbox 2.0.7

PDDocument document = /* get doc */
/* numeration is index-based. Starts from 0 */
List<PDAnnotation> annotations = document.getPage(yourPageNumber - 1).getAnnotations();
PDAnnotationTextMarkup highlight = new PDAnnotationTextMarkup(PDAnnotationTextMarkup.SUB_TYPE_HIGHLIGHT);
highlight.setRectangle(PDRectangle.A4);
// quadPoints is array of x,y coordinates in Z-like order (top-left, top-right, bottom-left,bottom-right) 
// of the area to be highlighted
highlight.setQuadPoints(quadPoints);
PDColor yellow = new PDColor(new float[]{1, 1, 204 / 255F}, PDDeviceRGB.INSTANCE);
highlight.setColor(yellow);
annotations.add(highlight);

Note: such annotation will be displayed if you save doc in file, but it will not appear in image created from page since there is no AppearanceStream created for this annotation. I solved it with code drafts from PDFBOX-3353

回答4:

Simplest way ... draw a rectangle in the desired location and set the height to 1 and the fill color to BLACK. or ...

Using PDFBox ... //create the page PDDocument doc = new PDDocument(); PDPage page1 = new PDPage(); doc.addPage(page1); //create the stream PDPageContentStream stream1 = new PDPageContentStream(doc, page1); //to simply draw an underscore with the coordinates //where the first is x start, second y start, third x end, fourth y end stream1.drawLine(20, 740, 590, 740); //to draw an underscore thicker than one pixel //first x begin second y begin third length fourth thickness stream1.addRect(345, 568, 70, 2); stream1.setNonStrokingColor(Color.BLACK); stream1.fill(); –

来源：https://stackoverflow.com/questions/18463543/highlight-text-using-pdfbox-when-its-location-in-the-pdf-is-known

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