如何使用Itext Library减小现有PDF中每个单元格值的字体大小

Question

我想减少字体大小到任何像素值，如2或3等。我有如下的Pdf表格，

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Answer 1

获得如下BaseFont = BaseFont.createFont(BaseFont.HELVETICA，BaseFont.CP1252，BaseFont.EMBEDDED)；

    AcroFields fields = stamper.getAcroFields();
    for (String key : fields.getFields().keySet()) {

        if (!values.containsKey(key)) {
            System.out.println("Value not found for:" + key);
            continue;
        }

        fields.setFieldProperty(key, "textsize", 4f, null);
        fields.setFieldProperty(key, "textfont", font, null);
        fields.setField(key, values.get(key));
        fields.regenerateField(key);
    }