通过 Java 编辑 PDF

	public static void ReplaceTextInParticularRegion(){
    // load PDF file
    Document pdfDocument = new Document(_dataDir+"sample.pdf");

    // instantiate TextFragment Absorber object
    TextFragmentAbsorber textFragmentAbsorber = new TextFragmentAbsorber("PDF");

    // search text within page bound
    textFragmentAbsorber.getTextSearchOptions().setLimitToPageBounds(true);

    // specify the page region for TextSearch Options
    textFragmentAbsorber.getTextSearchOptions().setRectangle(new Rectangle(100, 700, 400, 770));

    // search text from first page of PDF file
    pdfDocument.getPages().get_Item(1).accept(textFragmentAbsorber);

    // iterate through individual TextFragment
    for(TextFragment tf : textFragmentAbsorber.getTextFragments())
    {
        // replace text with "---"
        tf.setText("---");
    }

    // Save the updated PDF file
    pdfDocument.save(_dataDir+"Updated_Text.pdf");
}