java 读取文内容（text，html）

 public static String openFile(MultipartFile file) {
        try {
            BufferedReader bis = new BufferedReader(new InputStreamReader(file.getInputStream()));
            StringBuilder szContent = new StringBuilder();
            String szTemp;

            while ((szTemp = bis.readLine()) != null) {
                szContent.append(szTemp);
            }
            bis.close();
            return szContent.toString();
        } catch (Exception e) {
            logger.error("open file fail ===》", e);
            return "";
        }
    }