使用Java提取和删除PDF文档附件的完整指南

<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>12.3.9</version>
    </dependency>
</dependencies>

import com.spire.pdf.PdfDocument;
import com.spire.pdf.attachments.*;
import java.io.*;
public class ExtractAllAttachments {
    public static void main(String[] args) throws Exception {
        // 加载 PDF 文档
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("data/template_Pdf_2.pdf");
        // 获取附件集合
        PdfAttachmentCollection attachments = pdf.getAttachments();
        // 遍历所有附件并保存到本地
        for (int i = 0; i < attachments.getCount(); i++) {
            PdfAttachment attachment = attachments.get(i);
            String fileName = attachment.getFileName();
            // 写入本地文件
            try (BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream(new File("output/" + fileName)))) {
                output.write(attachment.getData());
            }
        }
        // 释放资源
        pdf.close();
        pdf.dispose();
        System.out.println("所有附件已成功提取到 output 目录。");
    }
}

import com.spire.pdf.PdfDocument;
import com.spire.pdf.attachments.*;
import javax.imageio.stream.FileImageOutputStream;
import java.io.*;

public class ExtractSingleAttachment {
    public static void main(String[] args) throws IOException {
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("data/deleteAllAttachments.pdf");

        PdfAttachmentCollection attachments = pdf.getAttachments();

        if (attachments.getCount() > 0) {
            PdfAttachment attachment = attachments.get(0);
            try (FileImageOutputStream output = new FileImageOutputStream(new File("output/" + attachment.getFileName()))) {
                output.write(attachment.getData(), 0, attachment.getData().length);
            }

            System.out.println("已提取第一个附件：" + attachment.getFileName());
        } else {
            System.out.println("PDF 中没有附件。");
        }

        pdf.close();
        pdf.dispose();
    }
}

import com.spire.pdf.PdfDocument;
import com.spire.pdf.attachments.*;
import java.io.*;

public class GetAttachmentInfo {
    public static void main(String[] args) throws IOException {
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("data/deleteAllAttachments.pdf");

        PdfAttachmentCollection attachments = pdf.getAttachments();

        if (attachments.getCount() > 0) {
            PdfAttachment attachment = attachments.get(0);
            StringBuilder content = new StringBuilder();
            content.append("Filename: ").append(attachment.getFileName()).append("\n");
            content.append("Description: ").append(attachment.getDescription()).append("\n");
            content.append("Creation Date: ").append(attachment.getCreationDate()).append("\n");
            content.append("Modification Date: ").append(attachment.getModificationDate()).append("\n");

            writeStringToTxt(content.toString(), "output/AttachmentInfo.txt");

            System.out.println("附件信息已写入 output/AttachmentInfo.txt");
        } else {
            System.out.println("PDF 中没有附件。");
        }

        pdf.close();
        pdf.dispose();
    }

    private static void writeStringToTxt(String content, String fileName) throws IOException {
        try (FileWriter writer = new FileWriter(fileName, true)) {
            writer.write(content);
        }
    }
}

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

public class DeleteAllAttachments {
    public static void main(String[] args) {
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("data/deleteAllAttachments.pdf");

        PdfAttachmentCollection attachments = pdf.getAttachments();

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

        pdf.saveToFile("output/deleteAllAttachments.pdf");

        pdf.close();
        pdf.dispose();

        System.out.println("已删除 PDF 中的所有附件，并保存到 output/deleteAllAttachments.pdf");
    }
}