package com.ltkj.common.utils.pdfutils;
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import com.itextpdf.text.Document;
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import com.itextpdf.text.pdf.*;
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import org.apache.commons.io.IOUtils;
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import java.io.*;
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import java.util.List;
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/**
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* @Author: 西安路泰科技有限公司/lige
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* @Date: 2022/12/12 17:45
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*/
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public class MergePdf {
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/**
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* 合并PDF文件
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*
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* @param files 文件列表
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* @param output 输出的PDF文件
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* @throws
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*/
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public static void mergeFileToPDF(List<File> files, File output) {
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Document document = null;
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PdfCopy copy = null;
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OutputStream os = null;
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try {
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os = new FileOutputStream(output);
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document = new Document();
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copy = new PdfCopy(document, os);
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document.open();
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for (File file : files) {
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if (!file.exists()) {
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continue;
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}
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String fileName = file.getName();
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if (fileName.endsWith(".pdf")) {
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PdfContentByte cb = copy.getDirectContent();
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PdfOutline root = cb.getRootOutline();
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new PdfOutline(root, new PdfDestination(PdfDestination.XYZ), fileName
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.substring(0, fileName.lastIndexOf(".")));
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// 不使用reader来维护文件，否则删除不掉文件，一直被占用
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try (InputStream is = new FileInputStream(file)) {
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PdfReader reader = new PdfReader(is);
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int n = reader.getNumberOfPages();
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for (int j = 1; j <= n; j++) {
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document.newPage();
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PdfImportedPage page = copy.getImportedPage(reader, j);
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copy.addPage(page);
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}
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} catch (Exception e) {
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System.out.println("error to close file : {}" + file.getCanonicalPath());
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}
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} else {
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System.out.println("file may not be merged to pdf. name:" + file.getCanonicalPath());
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}
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}
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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if (document != null) {
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document.close();
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}
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if (copy != null) {
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copy.close();
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}
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if (os != null) {
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IOUtils.closeQuietly(os);
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}
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}
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}
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}
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