如何在Itext 5中设置字体家庭

Question

我无法弄清楚如何在现有的PDF字段上使用Itext5设置字体族。P>

这是我试图称呼此字体的方式(我只想使用fontfactory库的helvetica(：

Font Helvetica = FontFactory.getFont("Helvetica"); form.setFieldProperty("Text Field 1", "textfont", "Helvetica", null);

运行上述代码时，我会收到控制台错误消息：

Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to com.itextpdf.text.pdf.BaseFont at com.itextpdf.text.pdf.AcroFields.setFieldProperty(AcroFields.java:1033) at com.eb.anico.web.pdf.manipulatePdf(pdf.java:87) at com.eb.anico.web.pdf.main(pdf.java:55)

我能够做其他事情，例如制作字段多行，居中并更改字体颜色。但是更换字体家庭仍然无法工作。这是我的完整代码：

package com.pathtopackage;
import com.itextpdf.text.BaseColor;

import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Font;
import com.itextpdf.text.Font.FontFamily;
import com.itextpdf.text.FontFactory;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.AcroFields.Item;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.FontSelector;
import com.itextpdf.text.pdf.GrayColor;
import com.itextpdf.text.pdf.PdfAction;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfFormField;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfNumber;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.PushbuttonField;
import com.itextpdf.text.pdf.TextField;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class pdf  {

public static final String SRC = "src/resources/ads-horizontal-box-defined-size-single-line.pdf";
   public static final String DEST = "src/resources/ads-horizontal-box-defined-size-single-line-STYLED-TXTSIZEAUTOACROBAT-7.pdf";

   public static void main(String[] args) throws DocumentException, IOException {
       File file = new File(DEST);
       file.getParentFile().mkdirs();
       new pdf().manipulatePdf(SRC, DEST);
   }
   public void manipulatePdf(String src, String dest) throws DocumentException, IOException {
       PdfReader reader = new PdfReader(src);
       PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
       AcroFields form = stamper.getAcroFields();
       Item item = form.getFieldItem("Text Field 1");

       form.setFieldProperty("Text Field 1", "fflags", PdfFormField.FF_MULTILINE, null); //convert field to multiline
       item.getMerged(0).put(PdfName.Q, new PdfNumber(PdfFormField.Q_CENTER)); //center form field

       Font Helvetica = FontFactory.getFont("Helvetica");
       form.setFieldProperty("Text Field 1", "textfont", "Helvetica", null);
       form.setFieldProperty("Text Field 1", "textcolor", new BaseColor(0, 93, 171), null);
       form.setFieldProperty("Text Field 1", "textsize", new Float(16), null); //change field font size to 16

       PdfDictionary widget = item.getWidget(0);
       PdfArray rect = widget.getAsArray(PdfName.RECT);
       rect.set(2, new PdfNumber(rect.getAsNumber(2).floatValue()));
       String value = "Kyle Vassella";
       form.setField("Text Field 1", value);
       stamper.setFormFlattening(true); //flatten pdf
       stamper.close();
   }
}

Answer 1

所有这些在第8章中的" Inext"中都很好地解释。https://developers.itextpdf.com/examples/itext-action-second-edition/chapter-8

解决这个问题的一种方法是使用单个形式的对象本身，而不是整体上的形式。

PushbuttonField button = new PushbuttonField(writer, rect, "Buttons");
button.setBackgroundColor(new GrayColor(0.75f));
button.setBorderColor(GrayColor.GRAYBLACK);
button.setBorderWidth(1);
button.setBorderStyle(PdfBorderDictionary.STYLE_BEVELED);
button.setTextColor(GrayColor.GRAYBLACK);
button.setFontSize(12);

也请查看Itext5的API，以便您清楚地了解每种方法的参数。

http://itextsupport.com/apidocs/itext5/5.5.11/