问候，什么是最简单的方法来删除文本/段落从PDF文档。该程序需要一个PDF文档，并创建一个单独的PDF文档的每一页。在每个文档中，我有文本从原来的，我想删除。我尝试了几个例子，但它不工作，或者他们使用旧的库我使用的iText 7库

private void processPDF(String src, String dest) throws IOException, DocumentException {

    PdfReader reader = new PdfReader(src);
    PdfDictionary dict = reader.getPageN(1);
    PdfObject object = dict.getDirectObject(PdfName.CONTENTS);

    if (object instanceof PRStream) {
        PRStream stream = (PRStream) object;
        byte[] data = PdfReader.getStreamBytes(stream);
        String dd = new String(data, "UTF8")
                .replace("Hand made software", "");
        stream.setData(dd.getBytes("UTF8"));
        if (dd.contains("Hand made software")) {
            System.out.println("Contains");
        } 
    }

    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
    stamper.close();
    reader.close();

}

private void processPDF2(String src, String dest) throws InvalidPasswordException, IOException {
    Map<String, String> map = new HashMap<>();
    map.put("Hand made software", "");
    File template = new File(src);
    PDDocument document = PDDocument.load(template);
    List<PDField> fields = document.getDocumentCatalog().getAcroForm().getFields();
    for (PDField field : fields) {
        for (Map.Entry<String, String> entry : map.entrySet()) {
            if (entry.getKey().equals(field.getFullyQualifiedName())) {
                field.setValue(entry.getValue());
                field.setReadOnly(true);
            }
        }
    }
    File out = new File(dest);
    document.save(out);
    document.close();
}

我想删除“手工制作软件”行