Highlight specific word in a pdf document using itext7

Question

I want to create a pdf report in which some of the text alone is need to be highlighted while generating report.

my current code

private static Text returnCorrectColor(String letter,String htext, PdfFont helveticaFont, PdfFont helveticaBoldFont) {
    ArrayList<String>htextaslist = new ArrayList<>(Arrays.asList(htext.trim().split("\\r?\\n")));
    String v=StringUtils.normalizeSpace( htext.trim());

    Boolean flag=false;
    try {
        for (int i=0;i<htextaslist.size();i++) {
            System.out.println("entire linr"+letter);
            System.out.println("htext"+htextaslist.get(i));
            if (letter.trim().contains(htextaslist.get(i).trim())) {
                System.out.println("boolran"+"0inside");
                flag=true;
                if(flag)
                {
                    break;
                }
            } 
            else {
                flag=false;
            }

        }
    } catch (PatternSyntaxException e) {
        // TODO: handle exception
        flag=true;
    }
    if(flag) {
        return new Text(letter)
                 .setBackgroundColor(Color.GREEN)
                 .setFontColor(Color.BLACK)
                 .setFont(helveticaBoldFont);
    } else {
        return new Text(String.valueOf(letter))
              .setFontColor(Color.BLACK)
              .setFont(helveticaFont);
    
    }           
}

with this i'm able to highlight the entire line but what i need is to highlight a specific text that is "htext" only to be highlighted in a line.

And i don't hardcode the data in paragraph i call this method inside a for loop like

outputaslist = new ArrayList<>(Arrays.asList(output.split("\\r?\\n")));
for (int s = 0; s < outputaslist.size(); s++) {     
    paragraph.add(returnCorrectColor(outputaslist.get(s),testcaselist.get(i).getHtext(), helveticaFont, helveticaBoldFont));
    paragraph.add("\n");
}

my current ouput is like the above one but i expect the one below

Is there any way to do this?

one of my sample input

outputActive Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       
 PID/Program name    
 tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      
1185/systemd-resolv 
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      1441/cupsd          
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      1780/nginx: master  
tcp        0      0 127.0.0.1:35373         0.0.0.0:*               LISTEN      1616/containerd     
tcp        0      0 10.10.100.242:51938     13.33.60.102:443        TIME_WAIT   -                   
 tcp        0      0 10.10.100.242:52762     34.210.242.116:443      ESTABLISHED 6994/firefox        

I would like to highlight only listen in the output

Answer 1

I'm a little late to the party, but I had a similar issue,

To do this you have to find the locations of your words, then highlight those words.

    public static List<IPdfTextLocation> PdfFindKeywordLocations(PdfDocument pdfDocument, Keyword keyword, int pageNumber)
    {
        string cleanKeyword = DataFormatHelper.ReplaceStringText(keyword.Name, new Dictionary<string, string>()
        {
            {"[ ]", @"\W"}
        });

        Regex regex = new Regex(cleanKeyword, RegexOptions.IgnoreCase);

        RegexBasedLocationExtractionStrategy extractionStrategy = new RegexBasedLocationExtractionStrategy(regex);

        PdfCanvasProcessor parser = new PdfCanvasProcessor(extractionStrategy);

        parser.ProcessPageContent(pdfDocument.GetPage(pageNumber));

        return extractionStrategy.GetResultantLocations().ToList();
    }

    private static void PdfHighlightLocations(PdfDocument pdfDocument, IEnumerable<IPdfTextLocation> locations, int pageNumber)
    {
        PdfCanvas pdfCanvas = new PdfCanvas(pdfDocument.GetPage(pageNumber).NewContentStreamBefore(), pdfDocument.GetPage(pageNumber).GetResources(), pdfDocument);

        foreach (var l in locations)
        {
            pdfCanvas.SaveState().SetFillColor(ColorConstants.GREEN).Rectangle(l.GetRectangle().GetX(), l.GetRectangle().GetY(), l.GetRectangle().GetWidth(), l.GetRectangle().GetHeight()).Fill().RestoreState();
        }
    }