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Im trying to write to an existing pdf using the java pdf stamper, but for some reason there is a certain checkbox in the pdf that the text appears to be drawn under.

Code for Reading pdf:

PdfReader reader = new PdfReader(Testing.getImagePath() + "form.pdf");
File dir = new File(Testing.getResourcePath() + id + "/");
String destination = Testing.getResourcePath() + id + "form" + id + ".pdf";
File exist = new File(destination);

dir.mkdirs();
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(destination));
stamper.setFormFlattening(true);
PdfContentByte over;
over = stamper.getOverContent(1);

Code for Drawing text:

over.beginText();
over.setFontAndSize(bf, 11);
over.setTextMatrix(169, 322);
over.showText("X");
over.endText();
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1 回答 1

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首先：

遍历 PDF 中的 FormFields 并找出要设置的有效值：

        AcroFields form = stamper.getAcroFields();
        for(Entry<String, Item> field : form.getFields().entrySet()) {
            System.out.println(field.getKey() + ": " + field.getValue());
            String[] values = form.getAppearanceStates(field.getKey());
            StringJoiner sb = new StringJoiner(",");
            for (String value : values) {
                sb.add(value);
            }
            System.out.println("Possible Options: " + sb.toString());
        }

现在您应该可以通过设置它的允许值来选择复选框：

        form.setField("myCheckbox", "myYesValue");
于 2017-05-26T15:56:14.180 回答