iText 7合并字节数组中的文档

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class PdfMergeExample {
    public static void main(String[] args) {
        try {
            // 创建PdfDocument对象
            PdfDocument mergedDocument = new PdfDocument(new PdfWriter(new ByteArrayOutputStream()));

            // 合并文档
            byte[] document1 = getDocumentBytes("document1.pdf");
            byte[] document2 = getDocumentBytes("document2.pdf");

            PdfDocument document1Pdf = new PdfDocument(new PdfReader(document1));
            document1Pdf.copyPagesTo(1, document1Pdf.getNumberOfPages(), mergedDocument);

            PdfDocument document2Pdf = new PdfDocument(new PdfReader(document2));
            document2Pdf.copyPagesTo(1, document2Pdf.getNumberOfPages(), mergedDocument);

            // 关闭文档
            mergedDocument.close();

            // 保存合并后的文档
            byte[] mergedDocumentBytes = ((ByteArrayOutputStream) mergedDocument.getWriter().getOutputStream()).toByteArray();
            saveDocumentBytes(mergedDocumentBytes, "mergedDocument.pdf");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static byte[] getDocumentBytes(String documentPath) throws IOException {
        // 从文件中读取文档字节数组
        // 这里省略具体的读取逻辑
        return null;
    }

    private static void saveDocumentBytes(byte[] documentBytes, String documentPath) throws IOException {
        // 将文档字节数组保存到文件
        // 这里省略具体的保存逻辑
    }
}