itextpdf依賴

<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13.2</version></dependency>

代碼實現，? 我這里是直接輸出到response的響應流了，給前端頁面分頁查看pdf用，如果分割成多個pdf文件，可以輸出到自己的FileOutputStream

PdfReader reader = null;PdfWriter writer = null;//獲取文件輸入流FileInputStream is = null;try (//獲取響應輸出流ServletOutputStream os = response.getOutputStream()) {//截取文件名稱String fileName = path.substring(path.lastIndexOf("\\"));//文件下載response.setHeader("content-disposition","attachment;fileName=" + new String(fileName.getBytes("gb2312"), StandardCharsets.ISO_8859_1));// 頁碼為0 下載整個文件if (pageNum == 0) {is = new FileInputStream(tbSysParamsMapper.selectById("FILEPATH").getValue() + "\\" + path);IoUtil.copy(is, os);} else {reader = new PdfReader(tbSysParamsMapper.selectById("FILEPATH").getValue() + "\\" + path);//總頁數int pageCount = reader.getNumberOfPages();if (pageNum > pageCount) {throw new MyException(RespCodeEnum.NOT_HAVE_PAGES);}Document dd = new Document(reader.getPageSize(pageNum));writer = PdfWriter.getInstance(dd, os);dd.open();PdfContentByte cb = writer.getDirectContent();dd.newPage();cb.addTemplate(writer.getImportedPage(reader, pageNum), 0, 0);dd.close();writer.close();}} catch (IOException | DocumentException e) {e.printStackTrace();} finally {if (reader != null) {reader.close();}if (writer != null) {writer.close();}if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();}}}

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