HttpServletRequest 中获取输入流信息

HttpServletRequest 中获取输入流信息：

try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			byte[] temp = new byte[1024];
			int read;
			while((read = servletInputStream.read(temp)) > 0 ) {
				baos.write(temp, 0, read );
			}
			byte[] buffer = baos.toByteArray();
			return Base64.getEncoder().encodeToString(buffer);
		} catch (IOException e) {
			logger.error("读取文件流失败", e);
		}