How to implement the function of replacing fonts in PDF in Java

Introducing jar

Configure pom.xml in the Maven program:

<repositories>
        <repository>
            <id>com.e-iceblue</id>
            <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
        </repository>
    </repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf.free</artifactId>
        <version>5.1.0</version>
    </dependency>
</dependencies>

If you need to import manually, you can download the Jar package locally, then unzip it and find Spire in the lib folder .Pdf.jar file. Open "Project Structure" in IDEA and import the jar under the local path into the program, as shown in the figure:

Java code

1. Replace all fonts

Idea: After loading the PDF document, obtain the fonts in the source document, then define new fonts, replace the original fonts, and finally save the document.

Java

import com.spire.pdf.*;
import com.spire.pdf.graphics.PdfFont;
import com.spire.pdf.graphics.PdfFontFamily;
import com.spire.pdf.graphics.PdfFontStyle;
import com.spire.pdf.graphics.fonts.PdfUsedFont;

public class ReplaceAllFonts {
    public static void main(String[] args) throws Exception{
        //创建PdfDocument类的对象
        PdfDocument pdf = new PdfDocument();

        //加载PDF文档
        pdf.loadFromFile("input.pdf");

        //获取文档中的所有字体
        PdfUsedFont[] fonts = pdf.getUsedFonts();

        //遍历所有字体
        for (PdfUsedFont font: fonts) {

            //获取字体大小
            float fontSize = font.getSize();

            //创建新字体
            PdfFont newfont = new PdfFont(PdfFontFamily.Times_Roman, fontSize, PdfFontStyle.Italic);

            //替换原有字体
            font.replace(newfont);
        }

        //保存文档
        pdf.saveToFile("ReplaceAllFonts.pdf");
        pdf.dispose();
    }
}

2. Replace the specified font

Idea: Load PDF After searching the document, search and obtain the specified font in the document, then define a new font, replace the found original font, and finally save the document.

Java

import com.spire.pdf.PdfDocument;
import com.spire.pdf.graphics.*;
import com.spire.pdf.graphics.fonts.PdfUsedFont;

public class ReplaceSpecificFont {
    public static void main(String[] args) throws Exception{
        //创建PdfDocument类的对象
        PdfDocument pdf = new PdfDocument();

        //加载PDF文档
        pdf.loadFromFile("sample.pdf");

        //获取文档中的所有字体
        PdfUsedFont[] fonts = pdf.getUsedFonts();

        //遍历所有字体
        for (PdfUsedFont font: fonts)
        {
            //判断符合条件的字体
            if(font.getName().equals("Calibri"))
            {
                //获取字体大小
                float fontSize = font.getSize();

                //创建新字体
                PdfFont newfont = new PdfFont(PdfFontFamily.Times_Roman, fontSize, PdfFontStyle.Italic);

                //替换Calibri字体
                font.replace(newfont);
            }
        }

        //保存文档
        pdf.saveToFile("ReplaceSpecificFont.pdf");
        pdf.dispose();
    }
}

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