PdfDocument pdf = new PdfDocument();
pdf.loadFromFile(inputFile);
StringBuilder builder = new StringBuilder();
//Extract the table
PdfTableExtractor extractor = new PdfTableExtractor(pdf);
PdfTable[] tableLists = null;
for (int pageIndex = 0; pageIndex < pdf.getPages().getCount(); pageIndex++) {
    tableLists = extractor.extractTable(pageIndex);
    if (tableLists != null && tableLists.length > 0) {
        for (PdfTable table : tableLists) {
            int row = table.getRowCount();
            int column = table.getColumnCount();
            for (int i = 0; i < row; i++) {
                for (int j = 0; j < column; j++) {
                    if (j == 0) {
                        builder.append(table.getText(i, j));
                    } else {
                        String text = table.getText(i, j);
                        builder.append(text + " ");
                    }
                }
                builder.append("\r\n");
            }
        }
    }
}
FileWriter fileWriter = new FileWriter(outputFile);
fileWriter.write(builder.toString());
fileWriter.flush();
fileWriter.close();