[工作日志] 2019-04-12 按行读取文件和读取全部文件信息

private String getContent(MultipartFile file) {
    long start = System.currentTimeMillis();
    InputStream is = null;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    try {
        is = file.getInputStream();
        byte[] b = new byte[1024];
        int n;
        while ((n = is.read(b)) != -1) {
            out.write(b, 0, n);
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
    return out.toString();
}




private void checkHeadAndTail(MultipartFile file){
    if (file == null) {
        throw new ApiException(WrapperEnumError.PARAMS_MISS.getCode(), "公钥文件不能为空");
    }
    List<String> list = new ArrayList<>();
    try {
        InputStream inputStream = file.getInputStream();
        BufferedReader read = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
        String line;
        while ((line = read.readLine()) != null){
            list.add(line);
        }
        if(!list.get(0).trim().equals("-----BEGIN PUBLIC KEY-----")){
            throw new ApiException(WrapperEnumError.OTHER_ERROR.getCode(), "文件开头格式错误");
        }
        if(!list.get(list.size() - 1).trim().equals("-----END PUBLIC KEY-----")){
            throw new ApiException(WrapperEnumError.OTHER_ERROR.getCode(), "文件结尾格式错误");
        }
    } catch (IOException e) {
        e.printStackTrace();
    }


}