PDFbox 找不到字体:/Helv [英] PDFbox Could not find font: /Helv

问题描述

我尝试将表单域添加到现有 PDF 文件，但出现以下错误 PDFbox 找不到字体:/Helv

I try to add form fields to existing PDF file but the following error appears PDFbox Could not find font: /Helv

我在 Java 中的代码具有以下视图:

My code in Java has the following view:

        PDDocument pdf = PDDocument.load(inputStream);
        PDDocumentCatalog docCatalog = pdf.getDocumentCatalog();
        PDAcroForm acroForm = docCatalog.getAcroForm();
        PDPage page = pdf.getPage(0);

        PDTextField textBox = new PDTextField(acroForm);
        textBox.setPartialName("SampleField");
        acroForm.getFields().add(textBox);
        PDAnnotationWidget widget = textBox.getWidgets().get(0);
        PDRectangle rect = new PDRectangle(0, 0, 0, 0);
        widget.setRectangle(rect);
        widget.setPage(page);
        widget.setAppearance(acroForm.getFields().get(0).getWidgets().get(0).getAppearance());

        widget.setPrinted(false);

        page.getAnnotations().add(widget);

        acroForm.refreshAppearances();
        acroForm.flatten();
        pdf.save(outputStream);
        pdf.close();

您知道为什么会出现异常吗?

Do you have any ideas why the exception appears?

有栈顶跟踪

java.io.IOException: Could not find font: /Helv
at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processSetFont(PDDefaultAppearanceString.java:179)
at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processOperator(PDDefaultAppearanceString.java:132)
at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.processAppearanceStringOperators(PDDefaultAppearanceString.java:108)
at org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.<init>(PDDefaultAppearanceString.java:86)
at org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.getDefaultAppearanceString(PDVariableText.java:93)
at org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.<init>(AppearanceGeneratorHelper.java:100)
at org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:262)
at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:368)
at com.workjam.service.impl.PDFService.fillForm(PDFService.java:85)

这是 PDF 的链接:https:///drive.google.com/file/d/0B2--NSDOiujoR3hOZFYteUl2UE0/view?usp=sharing

Here is the link for PDF: https://drive.google.com/file/d/0B2--NSDOiujoR3hOZFYteUl2UE0/view?usp=sharing

推荐答案

您的新文本字段没有默认外观，因此 PDFBox 为您制作了一个 (/Helv 0 Tf 0 g).

Your new text field doesn't have a default appearance, so PDFBox makes one for you (/Helv 0 Tf 0 g).

解决方案 1:从您正在使用的字段中获取它(这不适用于每个 PDF，因为您做出了几个假设，即有一个字段并且它是一个文本字段)

Solution 1: get it from the field you're using (this will not work with every PDF because you're making several assumptions, i.e. that there is a field and that it is a text field)

textBox.setDefaultAppearance(((PDTextField)acroForm.getFields().get(0)).getDefaultAppearance());

方案二:初始化默认资源:

Solution 2: initialize the default resources:

PDResources resources = new PDResources();
resources.put(COSName.getPDFName("Helv"), PDType1Font.HELVETICA);
acroForm.setDefaultResources(resources);

另见 CreateSimpleForm.java 源代码下载示例.

See also the CreateSimpleForm.java example from the source code download.

更新:这已在 2.0.8 中修复，请参阅问题 PDFBOX-3943.

Update: this has been fixed in 2.0.8, see issue PDFBOX-3943.

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