itext5生成pdf和合并pdf

选择哪个版本？
‌iText 5开源免费，‌iText 7部分功能收费；本次使用iText5版本，使用方式如下：
目标：使用itext5生成pdf，生成内容包括标题，段落，多个合并单元格的表格，复选框。
1 引入依赖

<!-- 核心库 --><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13.3</version></dependency><!-- 中文字体支持 --><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency>

2 生成pdf代码部分

    private static Font titleFont;private static Font tableHeaderFont;private static Font tableContentFont;//设置字体static {try {BaseFont baseFont = BaseFont.createFont("STSong-Light","UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);titleFont = new Font(baseFont, 18, Font.BOLD);tableHeaderFont = new Font(baseFont, 12, Font.BOLD, BaseColor.BLACK);tableContentFont = new Font(baseFont, 14, Font.NORMAL);} catch (Exception e) {e.printStackTrace();}}// 1. 初始化文档ByteArrayOutputStream outputStream = new ByteArrayOutputStream();Document document = new Document(PageSize.A4, 50, 50, 30, 30);PdfWriter writer = PdfWriter.getInstance(document, outputStream);document.open();//2设置标题Paragraph title = new Paragraph(desc, titleFont);title.setAlignment(Element.ALIGN_CENTER);title.setSpacingAfter(20f);document.add(title);//设置表格样式PdfPTable table = new PdfPTable(2);//2列table.setWidths(new float[]{3, 7});//2列宽度占比table.setWidthPercentage(100);//填充表格List<List<String>> data = Arrays.asList("列1行1","列1行2");for(List<String> list:data){for(String str:list){PdfPCell pdfCell = new PdfPCell(new Phrase(desc, tableContentFont));//设置字体样式pdfCell.setPadding(5);//设置字体和表格空隙pdfCell.setHorizontalAlignment(Element.ALIGN_CENTER);//设置文本水平居中pdfCell.setVerticalAlignment(Element.ALIGN_MIDDLE);//设置文本垂直居中table.addCell(pdfCell);//加到文档中}}//表格中绑定复选框RadioCheckField fistApply = PdfUtils.createRadio(writer, "firstApply", "isFirst", true);

	//复选框public static RadioCheckField createRadio(PdfWriter writer, String group, String value, boolean checked) throws DocumentException, IOException {RadioCheckField radio = new RadioCheckField(writer,new Rectangle(0, 0, 8, 8), // 按钮尺寸group, value);radio.setCheckType(RadioCheckField.TYPE_CHECK); // 方形外观radio.setChecked(checked);//是否选中，对号radio.setBorderStyle(PdfBorderDictionary.STYLE_BEVELED);radio.setBorderWidth(0.5f);//复选框边框radio.setBorderColor(BaseColor.BLACK);//复选框边框颜色return radio;}

3 合并pdf时怎么给pdf添加新标题？

private void mergePdfFile(PdfCopy copy, String path, String title, String subTitle) throws IOException, com.itextpdf.text.DocumentException {PdfReader reader = new PdfReader(path);// 为第一页添加标题ByteArrayOutputStream baos = new ByteArrayOutputStream();PdfStamper stamper = new PdfStamper(reader, baos);try {// 获取第一页PdfContentByte canvas = stamper.getOverContent(1);// 创建支持中文的字体BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);// 获取页面尺寸（推荐使用此方法）Rectangle pageSize = reader.getPageSizeWithRotation(1);// 获取页面宽度和高度float pageWidth = pageSize.getWidth();float pageHeight = pageSize.getHeight();//一级标题if (StringUtils.isNotEmpty(title)) {ColumnText.showTextAligned(canvas,Element.ALIGN_LEFT,new Phrase(title, new Font(bfChinese, 16, Font.BOLD)),36, // 固定左边距pageHeight - 20, // 距离顶部20个单位0);}//二级标题if (StringUtils.isNotEmpty(subTitle)) {ColumnText.showTextAligned(canvas,Element.ALIGN_LEFT,new Phrase(subTitle, new Font(bfChinese, 14, Font.NORMAL)),36, // 固定左边距pageHeight - 45, // 距离顶部45个单位0);}stamper.close();// 将修改后的PDF添加页码并添加到主文档PdfReader modifiedReader = new PdfReader(baos.toByteArray());// 获取当前页码作为起始页码int startPage = copy.getPageNumber();byte[] pdfWithPageNumbers = addPageNumbersToPdf(modifiedReader, startPage);PdfReader finalReader = new PdfReader(pdfWithPageNumbers);for (int i = 1; i <= finalReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(finalReader, i));}finalReader.close();} catch (Exception e) {System.err.println("添加页码时出错: " + e.getMessage());throw new DocumentException("添加页码失败", e);} finally {reader.close();baos.close();}System.out.println("成功合并PDF文件: " + path + " (" + reader.getNumberOfPages() + " 页)");}

4 怎么切换字体？
1 下载自定义字体包simsun.ttc；
2 读取字体文件；

            Path path = Paths.get("字体文件路径");if (!Files.exists(path)) {throw new EhlBusinessException("File not found: "); }byte[] fontBytes = Files.readAllBytes(path);// 假设你要用 iText 将字体嵌入 PDFBaseFont thirdBaseFont = BaseFont.createFont("simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, false, fontBytes, null);

5 怎么生成目录？
使用表格方式，可以保证生成的目录左右都是对齐的，标题和点（根据页宽计算点数）作为第一列，页数作为第二列；

private byte[] createTocPage() throws Exception {ByteArrayOutputStream tocStream = new ByteArrayOutputStream();Document tocDocument = new Document();try {PdfWriter tocWriter = PdfWriter.getInstance(tocDocument, tocStream);tocDocument.open();// 添加目录标题Paragraph tocTitle = new Paragraph("目录", TITLE_FONT);tocTitle.setAlignment(Element.ALIGN_CENTER);tocTitle.setSpacingAfter(20);tocDocument.add(tocTitle);// 添加目录项（使用点线连接）for (TocItem item : tocItems) {PdfPTable tocTable = new PdfPTable(2);tocTable.setWidthPercentage(100);tocTable.setWidths(new float[]{9f,1f});// 创建单元格PdfPCell cell = new PdfPCell();cell.setBorder(Rectangle.NO_BORDER);cell.setNoWrap(true);// 创建一个段落，手动处理点线连接Paragraph tocEntry = new Paragraph();tocEntry.setSpacingAfter(5);// 添加标题Chunk titleChunk = new Chunk(item.title, Level_2_TITLE_FONT);tocEntry.add(titleChunk);// 计算需要添加的点数（根据页面宽度和内容长度）float titleWidth = titleChunk.getWidthPoint();// 计算页码的宽度String pageNumberStr = String.valueOf(item.pageNumber);float pageNumberWidth = new Chunk(pageNumberStr, POINT_FONT).getWidthPoint();// 页面总宽度减去边距float pageWidth = tocDocument.getPageSize().getWidth() -tocDocument.leftMargin() - tocDocument.rightMargin();// 计算可用于点线的空间（总宽度 - 标题宽度 - 页码宽度 - 一些间距）float dotsWidth = pageWidth - titleWidth - pageNumberWidth - 10; // 减去额外间距// 添加点if (dotsWidth > 0) {BaseFont baseFont = POINT_FONT.getBaseFont();float dotWidth = baseFont.getWidthPoint(".", 12);int dotCount = (int) (dotsWidth / dotWidth);StringBuilder dots = new StringBuilder();for (int i = 0; i < dotCount; i++) {dots.append(".");}tocEntry.add(new Chunk(dots.toString(), POINT_FONT));}cell.addElement(tocEntry);Paragraph para = new Paragraph(String.valueOf(item.pageNumber), Level_2_TITLE_FONT);para.setAlignment(Element.ALIGN_RIGHT);PdfPCell cell2 = new PdfPCell(para);cell2.setHorizontalAlignment(Element.ALIGN_RIGHT);cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);cell2.setBorder(Rectangle.NO_BORDER);cell2.setNoWrap(true);tocTable.addCell(cell);tocTable.addCell(cell2);tocDocument.add(tocTable);}tocDocument.close();tocWriter.close();return tocStream.toByteArray();} finally {tocStream.close();}}

6 怎么生成书签？

private void addBookmarksToPdf(String inputPath, String outputPath) throws Exception {PdfReader reader = new PdfReader(inputPath);try {FileOutputStream fos = new FileOutputStream(outputPath);PdfStamper stamper = new PdfStamper(reader, fos);try {// 创建书签List<HashMap<String, Object>> bookmarks = new ArrayList<>();for (int i = 0; i < tocItems.size(); i++) {TocItem item = tocItems.get(i);HashMap<String, Object> bookmark = new HashMap<>();bookmark.put("Title", item.title);// 目标页码（考虑目录页偏移，页码从1开始，生成pdf后验证调整）bookmark.put("Page", String.valueOf(item.pageNumber));// 添加目标位置信息，确保可以跳转bookmark.put("Action", "GoTo");bookmarks.add(bookmark);}// 添加书签到PDFstamper.setOutlines(bookmarks);} finally {stamper.close();fos.close();}} finally {reader.close();}}

整体代码：

public class PdfMergeAndUploadDemo {// 在类中统一定义字体常量private static  Font TITLE_FONT;private static  Font Level_2_TITLE_FONT;private static  Font CONTET_FONT;private static  Font POINT_FONT;private static  Font TABLE_HEADER_FONT;private static  Font TABLE_CONTENT_FONT;@PostConstructpublic void init() {try {Path path = Paths.get("fontPath");if (!Files.exists(path)) {throw new EhlBusinessException("File not found: ");}byte[] fontBytes = Files.readAllBytes(path);// 假设你要用 iText 将字体嵌入 PDFBaseFont bfChinese = BaseFont.createFont("simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, false, fontBytes, null);TITLE_FONT = new Font(bfChinese, 16, Font.BOLD);Level_2_TITLE_FONT = new Font(bfChinese, 14, Font.BOLD);CONTET_FONT = new Font(bfChinese, 14, Font.NORMAL);POINT_FONT = new Font(bfChinese, 12, Font.NORMAL);TABLE_HEADER_FONT = new Font(bfChinese, 12, Font.BOLD);TABLE_CONTENT_FONT = new Font(bfChinese, 10, Font.NORMAL);} catch (Exception e) {log.error("加载字体异常:{}",e.getMessage(),e);throw new EhlBusinessException("Error loading font: " + e.getMessage());}}// 添加目录项类private static class TocItem {String title;int pageNumber;String destination;public TocItem(String title, int pageNumber, String destination) {this.title = title;this.pageNumber = pageNumber;this.destination = destination;}}// 存储目录项private List<TocItem> tocItems = new ArrayList<>();/*** 使用 iText 5 合并多个 PDF 文件并上传到 MinIO* @param catalogDataList 输入的文件路径列表（支持PDF和图片等）* @param objectName MinIO 对象名称* @throws Exception 操作异常*/public String mergePdfsAndUpload(List<CatalogData> catalogDataList, String title) throws Exception {// 创建临时文件File tempMergedFile = File.createTempFile("merged_", ".pdf");File tempWithBookmarks = File.createTempFile("bookmarks_", ".pdf");File tempFinalFile = File.createTempFile("final_", ".pdf");try {// 第一步：合并所有文件mergeAllFiles(catalogDataList, tempMergedFile.getAbsolutePath());// 第二步：添加目录并生成最终文件addTocToPdf(tempMergedFile.getAbsolutePath(), tempWithBookmarks.getAbsolutePath(),title);// 第三步：添加书签addBookmarksToPdf(tempWithBookmarks.getAbsolutePath(), tempFinalFile.getAbsolutePath());// 保存到本地目录String localFilePath = savePdfToLocal(tempFinalFile, title);System.out.println("PDF 已保存到本地: " + localFilePath);return localFilePath;} finally {// 清理临时文件deleteFileIfExists(tempMergedFile);deleteFileIfExists(tempWithBookmarks);deleteFileIfExists(tempFinalFile);// 清理目录项列表tocItems.clear();}}/*** 将PDF保存到本地目录* @param pdfFile PDF文件* @param fileName 文件名（不包含扩展名）* @return 保存的文件路径*/private String savePdfToLocal(File pdfFile, String fileName) {try {// 创建本地保存目录String localDirPath = "D:\\project\\v2xserver\\spring-boot-v2x\\src\\main\\test";File localDir = new File(localDirPath);if (!localDir.exists()) {localDir.mkdirs();}// 生成文件名（带时间戳）String timestamp = new java.text.SimpleDateFormat("yyyyMMdd_HHmmss").format(new java.util.Date());String localFileName = fileName + "_" + timestamp + ".pdf";String localFilePath = localDirPath + localFileName;// 复制文件到本地目录try (FileInputStream fis = new FileInputStream(pdfFile);FileOutputStream fos = new FileOutputStream(localFilePath)) {byte[] buffer = new byte[8192];int bytesRead;while ((bytesRead = fis.read(buffer)) != -1) {fos.write(buffer, 0, bytesRead);}fos.flush();}return localFilePath;} catch (Exception e) {System.err.println("保存PDF到本地时出错: " + e.getMessage());return null;}}private void deleteFileIfExists(File file) {if (file != null && file.exists()) {file.delete();}}/*** 合并所有文件* CatalogData 目录数据*/private void mergeAllFiles(List<CatalogData> catalogDataList, String outputPath) throws Exception {Document document = new Document();try (FileOutputStream fos = new FileOutputStream(outputPath)) {PdfCopy copy = new PdfCopy(document, fos);document.open();// 遍历每个输入文件并合并for (int i = 0; i < catalogDataList.size(); i++) {CatalogData catalogData = catalogDataList.get(i);if (catalogData.getType() == null) {//添加目录，自定义一个表格tocItems.add(new TocItem(catalogData.getTitle(), copy.getPageNumber(), ""));addFixedTable(copy, catalogData.getTitle(), catalogDataList);} else if (catalogData.getType().equals(AttachmentConfigTypeEnum.FILE.getCode())) {//处理附件if (CollectionUtils.isNotEmpty(catalogData.getPath())) {for (int j = 0; j < catalogData.getPath().size(); j++) {String title = j == 0 ? catalogData.getTitle() : "";mergeFile(copy, catalogData.getPath().get(j), title, "");}} else {// 当path为空时，添加标题和默认说明文字tocItems.add(new TocItem(catalogData.getTitle(), copy.getPageNumber(), ""));addEmptyPathNotice(copy, catalogData.getTitle());}} else if (catalogData.getType().equals(AttachmentConfigTypeEnum.DIRECTORY.getCode())) {//处理子类，第一次循环时添加一级目录，之后只需要加二级目录int first = 0;for (CatalogData child : catalogData.getChildren()) {if (first == 0) {if (CollectionUtils.isNotEmpty(child.getPath())) {for (int j = 0; j < child.getPath().size(); j++) {String title = j == 0 ? catalogData.getTitle() : "";String subTitle = j == 0 ? child.getTitle() : "";mergeFile(copy, child.getPath().get(j), title, subTitle);}} else {// 当path为空时，添加标题和说明文字tocItems.add(new TocItem(child.getTitle(), copy.getPageNumber(), ""));addEmptyPathNotice(copy, child.getTitle());}} else {if (CollectionUtils.isNotEmpty(child.getPath())) {for (int j = 0; j < child.getPath().size(); j++) {String subTitle = j == 0 ? child.getTitle() : "";mergeFile(copy, child.getPath().get(j), "", subTitle);}} else {// 当path为空时，添加标题和说明文字tocItems.add(new TocItem(child.getTitle(), copy.getPageNumber(), ""));addEmptyPathNotice(copy, child.getTitle());}}first++;}}}} finally {document.close();}}/*** 添加固定表格到PDF*/private void addFixedTable(PdfCopy copy, String title,List<CatalogData> catalogDataList) throws Exception {// 创建临时PDF用于表格ByteArrayOutputStream tableStream = new ByteArrayOutputStream();Document tableDocument = new Document();try {PdfWriter tableWriter = PdfWriter.getInstance(tableDocument, tableStream);tableDocument.open();Paragraph paragraph = new Paragraph(title, TITLE_FONT);paragraph.setAlignment(Element.ALIGN_LEFT);paragraph.setSpacingAfter(12f);tableDocument.add(paragraph);// 创建表格 (3列示例)PdfPTable table = new PdfPTable(4);table.setWidthPercentage(100);table.setSpacingBefore(10f);table.setSpacingAfter(10f);// 设置列宽float[] columnWidths = {1f, 3f, 4f,2f};table.setWidths(columnWidths);// 添加表头PdfPCell cell1 = new PdfPCell(new Paragraph("序号", TABLE_HEADER_FONT));cell1.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell1);PdfPCell cell2 = new PdfPCell(new Paragraph("类别", TABLE_HEADER_FONT));cell2.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell2);PdfPCell cell3 = new PdfPCell(new Paragraph("材料名称", TABLE_HEADER_FONT));cell3.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell3);PdfPCell cell4 = new PdfPCell(new Paragraph("是否提交", TABLE_HEADER_FONT));cell4.setHorizontalAlignment(Element.ALIGN_CENTER);table.addCell(cell4);List<List<String>> dataList = new ArrayList<>();int count = 1;for (int i = 0; i < 5; i++) {CatalogData catalogData = catalogDataList.get(i);if (CollectionUtils.isNotEmpty(catalogData.getChildren())){for (CatalogData child : catalogData.getChildren()){List<String> data = new ArrayList<>();data.add(String.valueOf(count));data.add(catalogData.getTitle());data.add(child.getTitle());data.add(CollectionUtils.isNotEmpty(child.getPath()) ? "是" : "否");dataList.add(data);count++;}}}for (List<String> data : dataList){for (String cell : data){PdfPCell pdfPCell = new PdfPCell(new Paragraph(cell, TABLE_CONTENT_FONT));pdfPCell.setHorizontalAlignment(Element.ALIGN_CENTER);pdfPCell.setVerticalAlignment(Element.ALIGN_MIDDLE);table.addCell(pdfPCell);}}tableDocument.add(table);// 添加页脚显示"第一页"Phrase footer = new Phrase("第1页", TABLE_CONTENT_FONT);// 计算页脚位置（页面底部居中）PdfContentByte canvas = tableWriter.getDirectContent();Rectangle pageSize = tableDocument.getPageSize();float x = (pageSize.getLeft() + pageSize.getRight()) / 2;float y = pageSize.getBottom() + 20;ColumnText.showTextAligned(canvas, Element.ALIGN_CENTER, footer, x, y, 0);tableDocument.close();tableWriter.close();// 将表格页添加到主文档PdfReader tableReader = new PdfReader(tableStream.toByteArray());for (int i = 1; i <= tableReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(tableReader, i));}tableReader.close();} finally {tableStream.close();}}/*** 添加空路径提示页面*/private void addEmptyPathNotice(PdfCopy copy, String title) throws Exception {// 创建临时PDF用于提示信息ByteArrayOutputStream noticeStream = new ByteArrayOutputStream();Document noticeDocument = new Document();try {PdfWriter noticeWriter = PdfWriter.getInstance(noticeDocument, noticeStream);noticeDocument.open();if (StringUtils.isNotEmpty(title)) {// 添加标题Paragraph titleParagraph = new Paragraph(title, TITLE_FONT);titleParagraph.setAlignment(Element.ALIGN_LEFT);titleParagraph.setSpacingAfter(20f);noticeDocument.add(titleParagraph);}// 添加说明文字Paragraph noticeParagraph = new Paragraph("暂未提供", CONTET_FONT);noticeParagraph.setAlignment(Element.ALIGN_LEFT);noticeParagraph.setSpacingAfter(10f);noticeDocument.add(noticeParagraph);noticeDocument.close();noticeWriter.close();// 将提示页添加到主文档PdfReader noticeReader = new PdfReader(noticeStream.toByteArray());for (int i = 1; i <= noticeReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(noticeReader, i));}noticeReader.close();} finally {noticeStream.close();}}private void mergeFile(PdfCopy copy,String path,String title,String subTitle) throws Exception{try {// 记录当前页码（目录项的起始页）int startPage = copy.getPageNumber();// 判断文件类型并处理，添加到目录项if (isPdfFile(path)) {// 如果是PDF文件，直接合并mergePdfFile(copy, path, title,subTitle);} else {// 如果不是PDF文件，先转换为PDF再合并mergeNonPdfFileWithTitle(copy, path, title,subTitle);}// 添加到目录项if (StringUtils.isNotEmpty( title)){tocItems.add(new TocItem(title, startPage, "dest_"));}// 添加到目录项if (StringUtils.isNotEmpty( subTitle)){tocItems.add(new TocItem(subTitle, startPage, "dest_"));}} catch (InvalidPdfException e) {// 如果PDF验证失败，尝试作为非PDF文件处理System.out.println("文件不是有效PDF，尝试转换: " + path);int startPage = copy.getPageNumber();mergeNonPdfFileWithTitle(copy, path, title ,subTitle);// 添加到目录项if (StringUtils.isNotEmpty( title)){tocItems.add(new TocItem(title, startPage, "dest_"));}// 添加到目录项if (StringUtils.isNotEmpty( subTitle)){tocItems.add(new TocItem(subTitle, startPage, "dest_"));}} catch (Exception e) {System.err.println("处理文件时出错: " + path + ", 错误: " + e.getMessage());throw new Exception("处理文件失败: " + path, e);}}/*** 添加大标题页面*/private void addMainTitlePage(Document document, PdfCopy copy,String objectName) throws Exception {// 创建临时PDF用于大标题页ByteArrayOutputStream titleStream = new ByteArrayOutputStream();Document titleDocument = new Document();try {PdfWriter titleWriter = PdfWriter.getInstance(titleDocument, titleStream);titleDocument.open();// 添加大标题Paragraph mainTitle = PdfUtils.createPdfTitle(objectName);titleDocument.add(mainTitle);// 添加日期String dateStr = new java.text.SimpleDateFormat("yyyy年MM月dd日").format(new java.util.Date());Paragraph date = new Paragraph(dateStr, Level_2_TITLE_FONT);date.setAlignment(Element.ALIGN_CENTER);titleDocument.add(date);titleDocument.close();titleWriter.close();// 将标题页添加到主文档PdfReader titleReader = new PdfReader(titleStream.toByteArray());for (int i = 1; i <= titleReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(titleReader, i));}titleReader.close();} finally {titleStream.close();}}/*** 添加目录到PDF（改进版）*/private void addTocToPdf(String sourcePath, String outputPath,String objectName) throws Exception {// 第一步：创建带目录的PDFbyte[] finalPdf = createPdfWithToc(sourcePath,objectName);// 写入最终文件try (FileOutputStream fos = new FileOutputStream(outputPath);ByteArrayInputStream bis = new ByteArrayInputStream(finalPdf)) {byte[] buffer = new byte[8192];int bytesRead;while ((bytesRead = bis.read(buffer)) != -1) {fos.write(buffer, 0, bytesRead);}}}/*** 创建带目录的PDF*/private byte[] createPdfWithToc(String sourcePath,String objectName) throws Exception {ByteArrayOutputStream outputStream = new ByteArrayOutputStream();// 创建新的文档用于生成带目录的PDFDocument document = new Document();try {PdfCopy copy = new PdfCopy(document, outputStream);document.open();// 1添加大标题页面  pdf名称和时间addMainTitlePage(document, copy,objectName);// 2首先创建目录页byte[] tocContent = createTocPage();PdfReader tocReader = new PdfReader(tocContent);for (int i = 1; i <= tocReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(tocReader, i));}tocReader.close();// 然后添加原始内容PdfReader reader = new PdfReader(sourcePath);for (int i = 1; i <= reader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(reader, i));}reader.close();} finally {document.close();}return outputStream.toByteArray();}/*** 使用 PdfStamper 添加书签到已合并的PDF*/private void addBookmarksToPdf(String inputPath, String outputPath) throws Exception {PdfReader reader = new PdfReader(inputPath);try {FileOutputStream fos = new FileOutputStream(outputPath);PdfStamper stamper = new PdfStamper(reader, fos);try {// 创建书签List<HashMap<String, Object>> bookmarks = new ArrayList<>();for (int i = 0; i < tocItems.size(); i++) {TocItem item = tocItems.get(i);HashMap<String, Object> bookmark = new HashMap<>();bookmark.put("Title", item.title);// 目标页码（考虑目录页偏移，页码从1开始）bookmark.put("Page", String.valueOf(item.pageNumber+2));// 添加目标位置信息，确保可以跳转bookmark.put("Action", "GoTo");bookmarks.add(bookmark);}// 添加书签到PDFstamper.setOutlines(bookmarks);} finally {stamper.close();fos.close();}} finally {reader.close();}}/*** 创建目录页并返回字节数组*/private byte[] createTocPage() throws Exception {ByteArrayOutputStream tocStream = new ByteArrayOutputStream();Document tocDocument = new Document();try {PdfWriter tocWriter = PdfWriter.getInstance(tocDocument, tocStream);tocDocument.open();// 添加目录标题Paragraph tocTitle = new Paragraph("目录页", TITLE_FONT);tocTitle.setAlignment(Element.ALIGN_CENTER);tocTitle.setSpacingAfter(20);tocDocument.add(tocTitle);// 添加目录项（使用点线连接）for (TocItem item : tocItems) {PdfPTable tocTable = new PdfPTable(2);tocTable.setWidthPercentage(100);// 设置列宽为100%tocTable.setWidths(new float[]{8f,2f});// 创建单元格PdfPCell cell = new PdfPCell();cell.setBorder(Rectangle.NO_BORDER);cell.setNoWrap(true);// 创建一个段落，手动处理点线连接Paragraph tocEntry = new Paragraph();tocEntry.setSpacingAfter(5);// 添加标题Chunk titleChunk = new Chunk(item.title, Level_2_TITLE_FONT);tocEntry.add(titleChunk);// 计算需要添加的点数（根据页面宽度和内容长度）float titleWidth = titleChunk.getWidthPoint();// 计算页码的宽度String pageNumberStr = String.valueOf(item.pageNumber);float pageNumberWidth = new Chunk(pageNumberStr, POINT_FONT).getWidthPoint();// 页面总宽度减去边距float pageWidth = tocDocument.getPageSize().getWidth() -tocDocument.leftMargin() - tocDocument.rightMargin();// 计算可用于点线的空间（总宽度 - 标题宽度 - 页码宽度 - 一些间距）float dotsWidth = pageWidth - titleWidth - pageNumberWidth - 10; // 减去额外间距// 添加点if (dotsWidth > 0) {BaseFont baseFont = POINT_FONT.getBaseFont();float dotWidth = baseFont.getWidthPoint(".", 12);int dotCount = (int) (dotsWidth / dotWidth);StringBuilder dots = new StringBuilder();for (int i = 0; i < dotCount; i++) {dots.append(".");}tocEntry.add(new Chunk(dots.toString(), POINT_FONT));}cell.addElement(tocEntry);Paragraph para = new Paragraph(String.valueOf(item.pageNumber), Level_2_TITLE_FONT);para.setAlignment(Element.ALIGN_RIGHT);PdfPCell cell2 = new PdfPCell(para);cell2.setHorizontalAlignment(Element.ALIGN_RIGHT);cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);cell2.setBorder(Rectangle.NO_BORDER);cell2.setNoWrap(true);tocTable.addCell(cell);tocTable.addCell(cell2);tocDocument.add(tocTable);}tocDocument.close();tocWriter.close();return tocStream.toByteArray();} finally {tocStream.close();}}/*** 判断文件是否为PDF格式* @param path 文件路径* @return 是否为PDF文件*/private boolean isPdfFile(String path) {try {byte[] header = new byte[4];if (path.startsWith("http://") || path.startsWith("https://")) {// 网络文件URL url = new URL(path);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("GET");try (InputStream inputStream = connection.getInputStream()) {inputStream.read(header);}} else {// 本地文件try (InputStream inputStream = new FileInputStream(path)) {inputStream.read(header);}}// PDF文件头应该是 %PDFreturn header[0] == 0x25 && header[1] == 0x50 && header[2] == 0x44 && header[3] == 0x46;} catch (Exception e) {System.err.println("检查文件类型时出错: " + path + ", 错误: " + e.getMessage());return false;}}/*** 合并PDF文件，在同一页添加标题和内容* @param copy PdfCopy对象* @param path PDF文件路径* @param title 标题* @throws IOException IO异常* @throws DocumentException 文档异常*/private void mergePdfFile(PdfCopy copy, String path, String title, String subTitle) throws IOException, DocumentException {PdfReader reader = new PdfReader(path);// 为第一页添加标题ByteArrayOutputStream baos = new ByteArrayOutputStream();PdfStamper stamper = new PdfStamper(reader, baos);try {// 获取第一页PdfContentByte canvas = stamper.getOverContent(1);// 获取页面尺寸（推荐使用此方法）Rectangle pageSize = reader.getPageSizeWithRotation(1);// 获取页面宽度和高度float pageWidth = pageSize.getWidth();float pageHeight = pageSize.getHeight();if (StringUtils.isNotEmpty(title)) {ColumnText.showTextAligned(canvas,Element.ALIGN_LEFT,new Phrase(title, TITLE_FONT),36, // 固定左边距pageHeight - 30, // 距离顶部20个单位0);}if (StringUtils.isNotEmpty(subTitle)) {ColumnText.showTextAligned(canvas,Element.ALIGN_LEFT,new Phrase(subTitle, Level_2_TITLE_FONT),36, // 固定左边距pageHeight - 50, // 距离顶部45个单位0);}stamper.close();// 将修改后的PDF添加页码并添加到主文档PdfReader modifiedReader = new PdfReader(baos.toByteArray());// 获取当前页码作为起始页码int startPage = copy.getPageNumber();byte[] pdfWithPageNumbers = addPageNumbersToPdf(modifiedReader, startPage);PdfReader finalReader = new PdfReader(pdfWithPageNumbers);for (int i = 1; i <= finalReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(finalReader, i));}finalReader.close();} catch (Exception e) {System.err.println("添加页码时出错: " + e.getMessage());throw new DocumentException("添加页码失败", e);} finally {reader.close();baos.close();}System.out.println("成功合并PDF文件: " + path + " (" + reader.getNumberOfPages() + " 页)");}/*** 为PDF文档添加页码* @param reader PDF读取器* @param startPage 起始页码* @return 添加页码后的PDF字节数组* @throws Exception 异常*/private byte[] addPageNumbersToPdf(PdfReader reader, int startPage) throws Exception {ByteArrayOutputStream baos = new ByteArrayOutputStream();try {PdfStamper stamper = new PdfStamper(reader, baos);// 为每一页添加页码int n = reader.getNumberOfPages();for (int i = 1; i <= n; i++) {PdfContentByte canvas = stamper.getOverContent(i);Phrase footer = new Phrase("第 " + (startPage + i - 1) + " 页", TABLE_CONTENT_FONT);// 获取页面尺寸Rectangle pageSize = reader.getPageSizeWithRotation(i);// 计算页码位置（页面底部居中）float x = (pageSize.getLeft() + pageSize.getRight()) / 2;float y = pageSize.getBottom() + 20;ColumnText.showTextAligned(canvas, Element.ALIGN_CENTER, footer, x, y, 0);}stamper.close();return baos.toByteArray();} finally {baos.close();}}/*** 合并非PDF文件并添加标题* @param copy PdfCopy对象* @param path 非PDF文件路径* @param title 标题* @throws IOException IO异常* @throws DocumentException 文档异常*/private void mergeNonPdfFileWithTitle(PdfCopy copy, String path, String title,String subTitle) throws IOException, DocumentException {// 创建临时PDF文档ByteArrayOutputStream tempPdfStream = new ByteArrayOutputStream();Document tempDocument = new Document();try {PdfWriter writer = PdfWriter.getInstance(tempDocument, tempPdfStream);tempDocument.open();if (StringUtils.isNotEmpty(title)){// 添加文件标题Paragraph titleParagraph = new Paragraph(title, TITLE_FONT);titleParagraph.setSpacingAfter(20);tempDocument.add(titleParagraph);}if (StringUtils.isNotEmpty(subTitle)){// 添加文件标题Paragraph subtitleParagraph = new Paragraph(subTitle, Level_2_TITLE_FONT);subtitleParagraph.setSpacingAfter(20);tempDocument.add(subtitleParagraph);}// 根据文件扩展名处理不同类型的文件String lowerPath = path.toLowerCase();if (lowerPath.endsWith(".jpg") || lowerPath.endsWith(".jpeg") ||lowerPath.endsWith(".png") || lowerPath.endsWith(".gif") ||lowerPath.endsWith(".bmp")) {// 处理图片文件addImageToDocument(tempDocument, path);} else {// 处理其他类型文件，添加文件名和路径信息addFileInfoToDocument(tempDocument, path, TITLE_FONT);}tempDocument.close();writer.close();// 将生成的PDF添加页码并合并到主文档PdfReader reader = new PdfReader(tempPdfStream.toByteArray());// 获取当前页码作为起始页码int startPage = copy.getPageNumber();// 调用addPageNumbersToPdf方法为PDF添加页码byte[] pdfWithPageNumbers = addPageNumbersToPdf(reader, startPage);PdfReader finalReader = new PdfReader(pdfWithPageNumbers);for (int i = 1; i <= finalReader.getNumberOfPages(); i++) {copy.addPage(copy.getImportedPage(finalReader, i));}finalReader.close();reader.close();System.out.println("成功转换并合并非PDF文件: " + path);} catch (Exception e) {System.err.println("添加页码时出错: " + e.getMessage());throw new DocumentException("添加页码失败", e);} finally {tempPdfStream.close();}}/*** 将图片添加到文档中* @param document Document对象* @param imagePath 图片路径* @throws IOException IO异常* @throws DocumentException 文档异常*/private void addImageToDocument(Document document, String imagePath) throws IOException, DocumentException {try {Image img;if (imagePath.startsWith("http://") || imagePath.startsWith("https://")) {// 网络图片img = Image.getInstance(new URL(imagePath));} else {// 本地图片img = Image.getInstance(imagePath);}// 调整图片大小以适应页面img.scaleToFit(document.getPageSize().getWidth() - 50, document.getPageSize().getHeight() - 50);img.setAlignment(Image.ALIGN_CENTER);document.add(img);} catch (Exception e) {// 如果图片处理失败，添加错误信息document.add(new Paragraph("无法处理图片文件: " + imagePath));document.add(new Paragraph("错误信息: " + e.getMessage()));}}/*** 将文件信息添加到文档中* @param document Document对象* @param filePath 文件路径* @throws DocumentException 文档异常*/private void addFileInfoToDocument(Document document, String filePath,Font contentFont) throws DocumentException {document.add(new Paragraph("原始文件信息"));document.add(new Paragraph("文件路径: " + filePath,contentFont));document.add(new Paragraph("文件类型: " + getFileExtension(filePath)));document.add(new Paragraph("注意: 该文件不是PDF格式，系统已自动转换。"));// 尝试获取文件大小try {long fileSize = 0;if (filePath.startsWith("http://") || filePath.startsWith("https://")) {URL url = new URL(filePath);fileSize = url.openConnection().getContentLength();} else {File file = new File(filePath);fileSize = file.length();}document.add(new Paragraph("文件大小: " + fileSize + " 字节"));} catch (Exception e) {document.add(new Paragraph("无法获取文件大小信息"));}}/*** 获取文件扩展名* @param filePath 文件路径* @return 文件扩展名*/private String getFileExtension(String filePath) {int lastDotIndex = filePath.lastIndexOf('.');if (lastDotIndex > 0 && lastDotIndex < filePath.length() - 1) {return filePath.substring(lastDotIndex + 1);}return "unknown";}
}