request获取数据流

   public static String getStreamAsString(InputStream stream, String charset) throws IOException {        final Closer closer = create();        try {            final Reader reader = new InputStreamReader(stream, charset);            closer.register(reader);            return CharStreams.toString(reader);        } finally {            try {                closer.close();            } catch (IOException e) {                LOGGER.error("通讯发生错误, 异常:{}", e);            }        }    }