Java 实现 PDF 附件的添加与删除：四种实用方法

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.cn/repository/maven-public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>12.4.4</version>
    </dependency>
</dependencies>

import com.spire.pdf.PdfDocument;
import com.spire.pdf.attachments.PdfAttachment;

public class AttachFilesToPdf {

    public static void main(String[] args) {
        // 创建 PDF 文档对象
        PdfDocument doc = new PdfDocument();

        // 加载已有 PDF 文件
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf");

        // 创建附件对象
        PdfAttachment attachment = new PdfAttachment("C:\\Users\\Administrator\\Desktop\\Data.xlsx");

        // 添加附件到 PDF
        doc.getAttachments().add(attachment);

        // 保存更新后的 PDF
        doc.saveToFile("Attachment.pdf");

        // 关闭文档
        doc.close();
    }
}

import com.spire.pdf.PdfPageBase;
import com.spire.pdf.annotations.*;
import com.spire.pdf.graphics.*;
import com.spire.pdf.PdfDocument;

import java.awt.*;
import java.awt.geom.Dimension2D;
import java.awt.geom.Rectangle2D;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.EnumSet;

public class AnnotationAttachment {

    public static void main(String[] args) throws IOException {
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf");

        // 获取第一页
        PdfPageBase page = doc.getPages().get(0);

        // 绘制提示文字
        String label = "请查看附件报告：";
        PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("微软雅黑", Font.PLAIN, 13));
        double x = 35;
        double y = page.getActualSize().getHeight() - 220;
        page.getCanvas().drawString(label, font, PdfBrushes.getRed(), x, y);

        // 将外部文件转换为字节数组
        String filePath = "C:\\Users\\Administrator\\Desktop\\Report.pptx";
        byte[] data = toByteArray(filePath);

        // 根据文字长度计算注释位置
        Dimension2D size = font.measureString(label);
        Rectangle2D bound = new Rectangle2D.Float((float) (x + size.getWidth() + 5), (float) y, 10, 15);

        // 创建附件注释
        PdfAttachmentAnnotation annotation = new PdfAttachmentAnnotation(bound, filePath, data);
        annotation.setColor(new PdfRGBColor(new Color(0, 128, 128)));
        annotation.setFlags(EnumSet.of(PdfAnnotationFlags.Default));
        annotation.setIcon(PdfAttachmentIcon.Graph);
        annotation.setText("点击此处打开附件");

        // 添加注释到页面
        page.getAnnotationsWidget().add(annotation);

        // 保存文档
        doc.saveToFile("Attachments.pdf");
        doc.close();
    }

    // 将文件转换为字节数组
    public static byte[] toByteArray(String filePath) throws IOException {
        File file = new File(filePath);
        long fileSize = file.length();
        if (fileSize > Integer.MAX_VALUE) {
            System.out.println("文件过大...");
            return null;
        }
        FileInputStream fi = new FileInputStream(file);
        byte[] buffer = new byte[(int) fileSize];
        int offset = 0;
        int numRead;
        while (offset < buffer.length
                && (numRead = fi.read(buffer, offset, buffer.length - offset)) >= 0) {
            offset += numRead;
        }
        if (offset != buffer.length) {
            throw new IOException("无法完整读取文件 " + file.getName());
        }
        fi.close();
        return buffer;
    }
}

import com.spire.pdf.PdfDocument;
import com.spire.pdf.attachments.PdfAttachmentCollection;

public class RemoveAttachments {

    public static void main(String[] args) {
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Attachments.pdf");

        // 获取普通附件集合（不包含注释附件）
        PdfAttachmentCollection attachments = doc.getAttachments();

        // 删除所有附件
        attachments.clear();

        // 或者删除指定附件
        // attachments.removeAt(0);

        // 保存更新后的 PDF
        doc.saveToFile("output/DeleteAttachments.pdf");
        doc.close();
    }
}

import com.spire.pdf.PdfDocument;
import com.spire.pdf.annotations.PdfAnnotation;
import com.spire.pdf.annotations.PdfAnnotationCollection;
import com.spire.pdf.annotations.PdfAttachmentAnnotationWidget;

public class RemoveAnnotationAttachments {

    public static void main(String[] args) {
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Attachments.pdf");

        // 遍历每一页
        for (int i = 0; i < doc.getPages().getCount(); i++) {
            PdfAnnotationCollection annotationCollection = doc.getPages().get(i).getAnnotationsWidget();

            // 遍历注释并删除附件注释
            for (Object annotation : annotationCollection) {
                if (annotation instanceof PdfAttachmentAnnotationWidget) {
                    annotationCollection.remove((PdfAnnotation) annotation);
                }
            }
        }

        // 保存文档
        doc.saveToFile("output/DeleteAnnotationAttachments.pdf");
        doc.close();
    }
}