/**
     * 預覽PDF文件
     *
     * @param filePath
     * @param originFileName
     * @return void
     * @author ss.xin
     * @date 2021/2/5 9:27
     */
    private void viewPdfFile(String filePath, String originFileName) {
        File file = new File(filePath);
        try (OutputStream outputStream = response.getOutputStream();
             //加載pdf附件到PDF流中
             PDDocument document = PDDocument.load(new FileInputStream(file))) {
            response.setCharacterEncoding(Constant.UTF8);
            String showName = StringUtils.isNotBlank(originFileName) ? originFileName : file.getName();
            showName = URLEncoder.encode(showName, Constant.UTF8);
            response.setHeader("Content-Disposition", "inline;fileName=" + showName + ";fileName*=UTF-8''" + showName);
            //從PDF流中獲得PDF文檔屬性對象
            PDDocumentInformation info = document.getDocumentInformation();
            //設(shè)置PDF文檔屬性對象的文件名稱（最重要的環(huán)節(jié)）
            info.setTitle(StringUtils.isNotBlank(originFileName) ? originFileName : file.getName());
            document.setDocumentInformation(info);
            //修改完直接輸出到響應體中
            document.save(outputStream);
        } catch (Exception e) {
            log.error(this.getClass().getName() + ".viewPdfFile：", e);
        }
    }

response.setContentType(“application/pdf; charset=UTF-8”);