如何填充PDF文本框注释

Question

我可以用以下代码填充文本框注释，但文本不会出现在某些阅读器中，比如Adobe Acrobat，尽管它确实出现在Chrome和其他基于Webkit的浏览器中。我试图填写的PDF文件不使用AcroForms或FDF。我使用的是ApachePDFBox，但我认为PDF库中没有太大差异，即使是跨语言/平台。

// edited for brevity
PDAnnotation annotation = doc.getPages().get(0).getAnnotations().get(0);
COSDictionary cosObject = annotation.getCOSObject();
cosObject.setString(COSName.V, content);

我尝试过将我的PDF输出与填充Chrome的文档进行比较，但我看到的唯一区别是默认外观（DA）属性。我尝试过这样设置默认外观文本内容，但无济于事：

java prettyprint-override">COSString defaultAppearance = (COSString)cosObject.getItem(COSName.DA);
COSString newAppearance = new COSString(defaultAppearance.getString() + "0 0 Td (" + value + ") Tj");
cosObject.setItem(COSName.DA, newAppearance);

我还弄乱了一些听起来很有希望的旗帜：

int FLAG_PRINT = 4;
int FLAG_READ_ONLY = 64;
annotation.setAnnotationFlags(annotation.getAnnotationFlags() | FLAG_PRINT | FLAG_READ_ONLY);

我还尝试了其他属性：

cosObject.setString(COSName.CONTENTS, content);

我相信PDF 1.7规范中的相关部分12.7.4.3。

Answer 1

您的PDF确实使用acroform字段。小部件注释是字段的视觉表示。你要做的是设置字段。这是设定场。java示例源代码下载。使用以下参数调用它：文件名、字段名（第一个名称是“topmostSubform[0].Page1[0].Step1a[0].f1_01[0]）和一个值。

要获取字段名称，请下载PDFDebugger并将鼠标悬停在您想要设置的字段上。

下面是设置后字段的外观：

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pdfbox.examples.interactive.form;

import java.io.File;
import java.io.IOException;
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.PDCheckBox;
import org.apache.pdfbox.pdmodel.interactive.form.PDComboBox;
import org.apache.pdfbox.pdmodel.interactive.form.PDField;
import org.apache.pdfbox.pdmodel.interactive.form.PDListBox;
import org.apache.pdfbox.pdmodel.interactive.form.PDRadioButton;
import org.apache.pdfbox.pdmodel.interactive.form.PDTextField;

/**
 * This example will take a PDF document and set a form field in it.
 *
 * @author Ben Litchfield
 *
 */
public class SetField
{
    /**
     * This will set a single field in the document.
     *
     * @param pdfDocument The PDF to set the field in.
     * @param name The name of the field to set.
     * @param value The new value of the field.
     *
     * @throws IOException If there is an error setting the field.
     */
    public void setField(PDDocument pdfDocument, String name, String value) throws IOException
    {
        PDDocumentCatalog docCatalog = pdfDocument.getDocumentCatalog();
        PDAcroForm acroForm = docCatalog.getAcroForm();
        PDField field = acroForm.getField(name);
        if (field != null)
        {
            if (field instanceof PDCheckBox)
            {
                if (value.isEmpty())
                    ((PDCheckBox) field).unCheck();
                else
                    ((PDCheckBox) field).check();
            }
            else if (field instanceof PDComboBox)
            {
                field.setValue(value);
            }
            else if (field instanceof PDListBox)
            {
                field.setValue(value);
            }
            else if (field instanceof PDRadioButton)
            {
                field.setValue(value);
            }
            else if (field instanceof PDTextField)
            {
                field.setValue(value);
            } 
        }
        else
        {
            System.err.println("No field found with name:" + name);
        }
    }

    /**
     * This will read a PDF file and set a field and then write it the pdf out
     * again. <br>
     * see usage() for commandline
     *
     * @param args command line arguments
     *
     * @throws IOException If there is an error importing the FDF document.
     */
    public static void main(String[] args) throws IOException
    {
        SetField setter = new SetField();
        setter.setField(args);
    }

    private void setField(String[] args) throws IOException
    {
        PDDocument pdf = null;
        try
        {
            if (args.length != 3)
            {
                usage();
            }
            else
            {
                SetField example = new SetField();
                pdf = PDDocument.load(new File(args[0]));
                example.setField(pdf, args[1], args[2]);
                pdf.save(args[0]);
            }
        }
        finally
        {
            if (pdf != null)
            {
                pdf.close();
            }
        }
    }

    /**
     * This will print out a message telling how to use this example.
     */
    private static void usage()
    {
        System.err.println("usage: org.apache.pdfbox.examples.interactive.form.SetField <pdf-file> <field-name> <field-value>");
    }
}