java - PDFBox:如何将 "flatten"设为 PDF 格式？

Question

如何使用 PDFBox“展平”PDF 表单(删除表单字段但保留字段的文本)？

Same question was answered here:

a quick way to do this, is to remove the fields from the acrofrom.

For this you just need to get the document catalog, then the acroform and then remove all fields from this acroform.

The graphical representation is linked with the annotation and stay in the document.

所以我写了这段代码:

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDDocumentCatalog;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;

public class PdfBoxTest {
    public void test() throws Exception {
        PDDocument pdDoc = PDDocument.load(new File("E:\\Form-Test.pdf"));
        PDDocumentCatalog pdCatalog = pdDoc.getDocumentCatalog();
        PDAcroForm acroForm = pdCatalog.getAcroForm();

        if (acroForm == null) {
            System.out.println("No form-field --> stop");
            return;
        }

        @SuppressWarnings("unchecked")
        List<PDField> fields = acroForm.getFields();

        // set the text in the form-field <-- does work
        for (PDField field : fields) {
            if (field.getFullyQualifiedName().equals("formfield1")) {
                field.setValue("Test-String");
            }
        }

        // remove form-field but keep text ???
        // acroForm.getFields().clear();         <-- does not work
        // acroForm.setFields(null);             <-- does not work
        // acroForm.setFields(new ArrayList());  <-- does not work
        // ???

        pdDoc.save("E:\\Form-Test-Result.pdf");
        pdDoc.close();
    }
}

Answer 1

使用 PDFBox 2，现在可以通过调用 PDAcroForm 对象上的 flatten 方法轻松“展平”PDF 表单。请参阅 Javadoc:PDAcroForm.flatten() .

带有此方法调用示例的简化代码:

//Load the document
PDDocument pDDocument = PDDocument.load(new File("E:\\Form-Test.pdf"));    
PDAcroForm pDAcroForm = pDDocument.getDocumentCatalog().getAcroForm();

//Fill the document
...

//Flatten the document
pDAcroForm.flatten();

//Save the document
pDDocument.save("E:\\Form-Test-Result.pdf");
pDDocument.close();

注意:动态 XFA 表单无法展平。

要从 PDFBox 1.* 迁移到 2.0，请查看 the official migration guide .