pdf工具类之获取pdf的总页数以及每页的宽度和高度

没啥可说的，毫无技术的水贴

    /**
     * 获取pdf的总页数以及每页的宽度和高度
     *
     * @param filePath
     * @return Map<String, List<Map<String, String>>>
     * @author 龙谷情
     * @date 2020/6/25 19:47
     * @exception/throws [异常类型] [异常说明]
     * @since [v1.0]
     */
    public static Map<String, List<Map<String, String>>> getPageNumByPath(String filePath) {
        Map resultMap = new HashMap(16);
        List<Map<String, String>> pageList = new ArrayList<>();
        int totalPages = 0;
        FileInputStream inputStream = null;
        PdfReader pdfReader = null;
        try {
            File file = new File(filePath);
            inputStream = new FileInputStream(file);
            pdfReader = new PdfReader(inputStream);
            totalPages = pdfReader.getNumberOfPages();
            for (int pageNum = 1; pageNum <= totalPages; pageNum++) {
                Map<String, String> pageMap = new HashMap<>(16);
                float width = pdfReader.getPageSize(pageNum).getWidth();
                float height = pdfReader.getPageSize(pageNum).getHeight();
                pageMap.put("pageNum", String.valueOf(pageNum));
                pageMap.put("width", String.valueOf(width));
                pageMap.put("height", String.valueOf(height));
                pageList.add(pageMap);
            }
            resultMap.put("totalPages", totalPages);
            resultMap.put("pageList", pageList);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != inputStream) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != pdfReader) {
                pdfReader.close();
            }
        }
        return resultMap;
    }