itextpdf依赖
<dependency> <groupId>com.itextpdf</groupId> <artifactId>itextpdf</artifactId> <version>5.5.13.2</version> </dependency>
代码实现， 我这里是直接输出到response的响应流了，给前端页面分页查看pdf用，如果分割成多个pdf文件，可以输出到自己的FileOutputStream
PdfReader reader = null; PdfWriter writer = null; //获取文件输入流 FileInputStream is = null; try ( //获取响应输出流 ServletOutputStream os = response.getOutputStream() ) { //截取文件名称 String fileName = path.substring(path.lastIndexOf("\\")); //文件下载 response.setHeader("content-disposition", "attachment;fileName=" + new String(fileName.getBytes("gb2312"), StandardCharsets.ISO_8859_1)); // 页码为0 下载整个文件 if (pageNum == 0) { is = new FileInputStream(tbSysParamsMapper.selectById("FILEPATH").getValue() + "\\" + path); IoUtil.copy(is, os); } else { reader = new PdfReader(tbSysParamsMapper.selectById("FILEPATH").getValue() + "\\" + path); //总页数 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(); } } }
