So fügen Sie in Java Seitenzahlen zu PDF-Dokumenten hinzu

<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>

import com.spire.pdf.*;
import com.spire.pdf.automaticfields.PdfCompositeField;
import com.spire.pdf.automaticfields.PdfPageCountField;
import com.spire.pdf.automaticfields.PdfPageNumberField;
import com.spire.pdf.graphics.*;

import java.awt.*;

public class addPageNumber {
    public static void main(String[] args) {

        //创建 PdfDocument 类的对象
        PdfDocument pdf = new PdfDocument();
        //载入PDF文档
        pdf.loadFromFile("九寨沟简介 .pdf");

        //创建 PdfTrueTypeFont 类的对象
        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("华文中宋", Font.PLAIN, 10));

        //创建 PdfPageNumberField 类的对象
        PdfPageNumberField pageNumberField = new PdfPageNumberField(font, PdfBrushes.getBlack());

        //创建 PdfPageCountField 类的对象
        PdfPageCountField pageCountField = new PdfPageCountField(font, PdfBrushes.getBlack());

        //创建一个 PdfCompositeField 类的对象，将页码字段和页数字段添加到复合字段
        PdfCompositeField compositeField = new PdfCompositeField(font, PdfBrushes.getBlack(), "第{0}页/共{1}页", pageNumberField, pageCountField);

        //设置复合字段的文字格式
        compositeField.setStringFormat(new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Top));

        //循环遍历文档中的页面
        for(int i = 0; i < pdf.getPages().getCount();i ++)
        {
            PdfPageBase page = pdf.getPages().get(i);
            float x = (float) page.getSize().getWidth()/2 - 20;
            float y = (float)page.getSize().getHeight() - pdf.getPageSettings().getMargins().getBottom();
            //将复合字段描绘于每个页面上
            compositeField.draw(page.getCanvas(), x, y);
        }

        //保存结果文档
        pdf.saveToFile("添加页码.pdf");
    }
}