一文详解如何使用Java分割PDF文件

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.13</version>
</dependency>

package org.util;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.*;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * PDF处理工具类
 */
public class PdfUtil {

    /**
     * 将PDF文件切分成多个PDF
     *
     * @param filename  文件名
     * @param splitSize 拆分单个文件页数
     * @throws Exception 抛出异常
     */
    public static void splitPdf(String filename, int splitSize) throws Exception {
        PdfReader reader;
        try {
            reader = new PdfReader(filename);
        } catch (IOException e) {
            throw new Exception("读取PDF文件失败");
        }
        int numberOfPages = reader.getNumberOfPages();
        int newFileCount = 0;
        // PageNumber是从1开始计数的
        int pageNumber = 1;
        while (pageNumber <= numberOfPages) {
            Document doc = new Document();
            String splitFileName = filename.substring(0, filename.length() - 4) + "(" + newFileCount + ").pdf";
            PdfCopy pdfCopy;
            try {
                pdfCopy = new PdfCopy(doc, new FileOutputStream(splitFileName));
            } catch (FileNotFoundException | DocumentException e) {
                throw new Exception("切割文件副本创建失败");
            }
            doc.open();
            // 将pdf按页复制到新建的PDF中
            for (int i = 1; pageNumber <= numberOfPages && i <= splitSize; ++i, pageNumber++) {
                doc.newPage();
                PdfImportedPage page = pdfCopy.getImportedPage(reader, pageNumber);
                pdfCopy.addPage(page);
            }
            doc.close();
            newFileCount++;
            pdfCopy.close();
        }
    }

    /**
     * 主方法
     *
     * @param args 参数
     * @throws Exception 抛出异常
     */
    public static void main(String[] args) throws Exception {
        String filename = "C:\\Users\\yjtzf\\Downloads\\apache-groovy-docs-4.0.15\\groovy-4.0.15\\html\\documentation\\index.pdf";
        splitPdf(filename, 250);
    }
}