问题

尝试使用以下代码填充此PDF表单（http://vaielab.com/Test/2.pdf）时，出现了以下错误：

```java
PDDocument pdfDocument = PDDocument.load(new File("2.pdf"));
pdfDocument.setAllSecurityToBeRemoved(true);
PDDocumentCatalog docCatalog = pdfDocument.getDocumentCatalog();
PDAcroForm acroForm = docCatalog.getAcroForm();
if (acroForm != null) {				
    PDField field = (PDField) acroForm.getField("rad2");
    try {
        field.setValue("0");
    } catch (Exception e) {
        System.out.println(e);
    }
}
pdfDocument.save("output.pdf");
pdfDocument.close();

我收到了这个错误：值“0”不是字段rad2的有效选项，有效值为：[Yes] 和 Off

但是值“0”应该是一个有效选项，如果我使用pdftk进行dump_data_fields，我得到了以下内容：

FieldType: Button
FieldName: rad2
FieldFlags: 49152
FieldJustification: Left
FieldStateOption: 0
FieldStateOption: 1
FieldStateOption: Off
FieldStateOption: Yes

我还尝试了值“1”，但是得到了完全相同的错误。

我正在使用pdfbox 2.0.20

<details>
<summary>英文:</summary>

When trying to fill the form of this pdf (http://vaielab.com/Test/2.pdf) with this code

PDDocument pdfDocument = PDDocument.load(new File("2.pdf"));
pdfDocument.setAllSecurityToBeRemoved(true);
PDDocumentCatalog docCatalog = pdfDocument.getDocumentCatalog();
PDAcroForm acroForm = docCatalog.getAcroForm();
if (acroForm != null) {
PDField field = (PDField) acroForm.getField("rad2");
try {
field.setValue("0");
} catch (Exception e) {
System.out.println(e);
}
}
pdfDocument.save("output.pdf");
pdfDocument.close();

I get this error: value '0' is not a valid option for the field rad2, valid values are: [Yes] and Off

But value "0" should be a valid option, and if I do a dump_data_fields with pdftk, I get this:

FieldType: Button
FieldName: rad2
FieldFlags: 49152
FieldJustification: Left
FieldStateOption: 0
FieldStateOption: 1
FieldStateOption: Off
FieldStateOption: Yes

I also tried the value "1" but get the exact same error.

I'm using pdfbox 2.0.20

</details>


# 答案1
**得分**: 2

这是因为在`Root/AcroForm/Fields/[7]/Opt`中的`Opt`值，其中一个只有两个“是”条目。当设置了`/Opt`时，PDFBox中的`PDButton.setValue()`代码会以不同的方式更新此字段。在这种情况下，最好的做法是不进行设置，或通过调用`field.setExportValues(null)`来移除这些条目。然后有效的设置将为0、1和“关闭”。

[![字段的PDFDebugger截图][1]][1]

  [1]: https://i.stack.imgur.com/p7jwU.png

<details>
<summary>英文:</summary>

This is because of the `Opt` values in `Root/AcroForm/Fields/[7]/Opt`, that one has two &quot;Yes&quot; entries only. The `PDButton.setValue()` code in PDFBox updates this field differently when `/Opt` is set. The best here would be not to set it, or remove these entries by calling `field.setExportValues(null)` . Then valid settings would be 0, 1 and &quot;Off&quot;.

[![PDFDebugger screenshot of the field][1]][1]


  [1]: https://i.stack.imgur.com/p7jwU.png

</details>