保存的文本字段值在使用PDFBOX生成的PDF中无法正确显示

import java.io.IOException;

import javax.swing.text.BadLocationException;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.interactive.action.PDAnnotationAdditionalActions;
import org.apache.pdfbox.pdmodel.interactive.action.type.PDActionJavaScript;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDTextbox;
import org.junit.Test;

public class TestPDTextbox {
    @Test
    public void Sample1 () throws IOException, COSVisitorException, BadLocationException {


        PDDocument doc = new PDDocument();
        PDPage page = new PDPage();
        doc.addPage(page);   

        COSDictionary acroFormDict = new COSDictionary(); 
//        acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), true);
        acroFormDict.setItem(COSName.getPDFName("Fields"), new COSArray());

        PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
        doc.getDocumentCatalog().setAcroForm(acroForm);

        COSDictionary cosDict1 = new COSDictionary();
        COSArray rect1 = new COSArray();
        rect1.add(new COSFloat(100));
        rect1.add(new COSFloat(700));
        rect1.add(new COSFloat(200));
        rect1.add(new COSFloat(750));

        cosDict1.setItem(COSName.RECT, rect1);
        cosDict1.setItem(COSName.FT, COSName.getPDFName("Tx")); // Field Type
        cosDict1.setItem(COSName.TYPE, COSName.ANNOT);
        cosDict1.setItem(COSName.SUBTYPE, COSName.getPDFName("Widget"));
        cosDict1.setItem(COSName.T, new COSString("tx1"));
        cosDict1.setItem(COSName.DA, new COSString("/Helv 7 Tf 0 g"));
        cosDict1.setItem(COSName.V, new COSString("Test Value1"));

        PDTextbox textbox = new PDTextbox(doc.getDocumentCatalog().getAcroForm(), cosDict1);

//      textbox.setValue("Test Value");

        page.getAnnotations().add(textbox.getWidget());
        acroForm.getFields().add(textbox);

         doc.save("C:\\PDF\\SampleTextbox.pdf");
         doc.close();
    }
}

Issue#1 我创建了一个文本字段,如上面的代码所示,并尝试使用textbox.setValue("Test Value")设置值;方法,但它给出错误,如下所示:

java.io.IOException: Error: Don't know how to calculate the position for non-simple fonts
    at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.getTextPosition(PDAppearance.java:1037)
    at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.insertGeneratedAppearance(PDAppearance.java:558)
    at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.setAppearanceValue(PDAppearance.java:338)
    at org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.setValue(PDVariableText.java:131)
    at sample.pdfbox.example.TestPDTextbox.Sample1(TestPDTextbox.java:54)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Issue#2

为了解决问题#1,如果我使用cosDictionary属性设置textBox的值,即cosDict1.setItem(COSName.V,new COSString(“Test Value1”));

然后在Adobe Reader中,textBox的值未正确填充 . 我必须单击文本框,然后只显示值,一旦我从字段中移出,值再次变为不可见 .

Issue#3

为了解决问题#2,我需要将needAppearances标志设置为true,如下所示,然后在PDF中正确显示该字段值 . 但是在这个解决方案之后,一旦用户更改字段值,我就无法提取/解析PDF字段,我们再次解析此PDF .

Note:- 此问题存在于Adobe Reader中,在此处打开PDF时,它提供了一些消息,就像修复表单字段一样 . 一旦我保存PDF并尝试解析acroform字段,就会发现所有字段都被重置或为空 . 不能提取字段名称或字段值 .

所以使用acroFormDict.setBoolean(COSName.getPDFName(“NeedAppearances”),true);代码似乎有风险,它在PDF解析中创建了其他问题,因此无法使用 .

COSDictionary acroFormDict = new COSDictionary(); 
        acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), true);
        acroFormDict.setItem(COSName.getPDFName("Fields"), new COSArray());

        PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
        doc.getDocumentCatalog().setAcroForm(acroForm);

我想,我需要为文本字段设置PDAppearanceDictionary,但我不知道这样做以及是否需要为每个字段或acroform级别设置 .

请帮我解决这个问题,我该如何解决 . 我正在使用PDFBOX版本1.8.10 .

回答(1)

2 years ago

在上面的问题中,我通过向acroform添加页面资源并使用正确的Default Appearance字符串来修复问题#1 . 现在我不需要将needsAppearance标志设置为true .

PDFont font = PDType1Font.HELVETICA;
        PDResources res = new PDResources();
        String fontName = res.addFont(font);
        String defaultAppearance = "/"+fontName+" 7 Tf 0 g";

        COSDictionary acroFormDict = new COSDictionary(); 
        acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), false);
        acroFormDict.setItem(COSName.getPDFName("Fields"), new COSArray());
        acroFormDict.setItem(COSName.DA, new COSString(defaultAppearance));

        PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
        acroForm.setDefaultResources(res);

检查下面的整个更正代码:

import java.io.IOException;

import javax.swing.text.BadLocationException;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSString;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDTextbox;
import org.junit.Test;

public class TestPDTextbox {
    @Test
    public void Sample1 () throws IOException, COSVisitorException, BadLocationException {


        PDDocument doc = new PDDocument();
        PDPage page = new PDPage();
        doc.addPage(page);   

        PDFont font = PDType1Font.HELVETICA;
        PDResources res = new PDResources();
        String fontName = res.addFont(font);
        String defaultAppearance = "/"+fontName+" 7 Tf 0 g";

        COSDictionary acroFormDict = new COSDictionary(); 
        acroFormDict.setBoolean(COSName.getPDFName("NeedAppearances"), false);
        acroFormDict.setItem(COSName.getPDFName("Fields"), new COSArray());
        acroFormDict.setItem(COSName.DA, new COSString(defaultAppearance));

        PDAcroForm acroForm = new PDAcroForm(doc, acroFormDict);
        acroForm.setDefaultResources(res);

        doc.getDocumentCatalog().setAcroForm(acroForm);

        COSDictionary cosDict1 = new COSDictionary();
        COSArray rect1 = new COSArray();
        rect1.add(new COSFloat(100));
        rect1.add(new COSFloat(700));
        rect1.add(new COSFloat(200));
        rect1.add(new COSFloat(750));

        cosDict1.setItem(COSName.RECT, rect1);
        cosDict1.setItem(COSName.FT, COSName.getPDFName("Tx")); // Field Type
        cosDict1.setItem(COSName.TYPE, COSName.ANNOT);
        cosDict1.setItem(COSName.SUBTYPE, COSName.getPDFName("Widget"));
        cosDict1.setItem(COSName.T, new COSString("tx1"));
        cosDict1.setItem(COSName.DA, new COSString(defaultAppearance));
//        cosDict1.setItem(COSName.V, new COSString("Test Value1"));

        PDTextbox textbox = new PDTextbox(doc.getDocumentCatalog().getAcroForm(), cosDict1);

      textbox.setValue("Test Value");

        page.getAnnotations().add(textbox.getWidget());
        acroForm.getFields().add(textbox);

         doc.save("C:\\PDF\\SampleTextbox.pdf");
         doc.close();
    }
}