itextpdf提取PDF文件中的任意页码实现示例

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.13.3</version>
</dependency>

package com.magic.itextpdf;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Objects;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfCopy;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfSmartCopy;
/**
 * PDF工具类
 */
public class PdfUtils {
    /**
     * 抽取PDF文件
     * @param sourceFile 源PDF文件路径
     * @param targetFile 目标PDF文件路径
     * @param extractedPageNums 需要抽取的页码
     */
    public static void extract(String sourceFile, String targetFile, List<Integer> extractedPageNums) {
        Objects.requireNonNull(sourceFile);
        Objects.requireNonNull(targetFile);
        PdfReader reader = null;
        Document document = null;
        FileOutputStream outputStream = null;
        try {
            // 读取源文件
            reader = new PdfReader(sourceFile);
            // 创建新的文档
            document = new Document();
            // 创建目标PDF文件
            outputStream = new FileOutputStream(targetFile);
            PdfCopy pdfCopy = new PdfSmartCopy(document, outputStream);
            // 获取源文件的页数
            int pages = reader.getNumberOfPages();
            document.open();
            // 注意此处的页码是从1开始
            for (int page = 1; page <= pages; page++) {
                // 如果是指定的页码，则进行复制
                if (extractedPageNums.contains(page)) {
                    pdfCopy.addPage(pdfCopy.getImportedPage(reader, page));
                }
            }
        } catch (IOException | DocumentException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                reader.close();
            }
            if (document != null) {
                document.close();
            }
            if (outputStream != null) {
                try {
                    outputStream.flush();
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

PdfUtils.extract("D:\\Test\\test.pdf", "D:\\Test\\test_out.pdf", Collections.singletonList(1));

PdfUtils.extract("D:\\Test\\test.pdf", "D:\\Test\\test_out.pdf", Arrays.asList(1, 3, 5));

/**
 * 抽取PDF文件
 * @param sourceFile 源PDF文件路径
 * @param targetFile 目标PDF文件路径
 * @param fromPageNum 起始页码
 * @param toPageNum 结束页码
 */
public static void extract(String sourceFile, String targetFile, int fromPageNum, int toPageNum) {
    Objects.requireNonNull(sourceFile);
    Objects.requireNonNull(targetFile);
    PdfReader reader = null;
    Document document = null;
    FileOutputStream outputStream = null;
    try {
        // 读取源文件
        reader = new PdfReader(sourceFile);
        // 创建新的文档
        document = new Document();
        // 创建目标PDF文件
        outputStream = new FileOutputStream(targetFile);
        PdfCopy pdfCopy = new PdfSmartCopy(document, outputStream);
        // 获取源文件的页数
        int pages = reader.getNumberOfPages();
        document.open();
        // 注意此处的页码是从1开始
        for (int page = 1; page <= pages; page++) {
            if (page >= fromPageNum && page <= toPageNum) {
                pdfCopy.addPage(pdfCopy.getImportedPage(reader, page));
            }
        }
    } catch (IOException | DocumentException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            reader.close();
        }
        if (document != null) {
            document.close();
        }
        if (outputStream != null) {
            try {
                outputStream.flush();
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

PdfUtils.extract("D:\\Test\\test.pdf", "D:\\Test\\test_out.pdf", 10, 60);

package com.magic.itextpdf;
import java.util.Collections;
public class Test {
    public static void main(String[] args) {
        PdfUtils.extract("D:\\Test\\test.pdf", "D:\\Test\\test_out_1.pdf", Collections.singletonList(1));
        PdfUtils.extract("D:\\Test\\test.pdf", "D:\\Test\\test_out_2.pdf", 1, 1);
    }
}