读取文件信息

/**
     * 读取文件信息
     * @param src  文件路径
     * @return String
     */
    public static String readCacert(String src) {
        StringBuilder sb = new StringBuilder();
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File(src))));
            String CacertStr = null;
            while (null != (CacertStr = br.readLine())) {
                sb.append(CacertStr);
            }
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }