从服务器路径中读出图片流

 response.setContentType("image/gif"); OutputStream outputStream = response.getOutputStream();InputStream inputStream = new FileInputStream(imageFilePath);try {    byte[] buffer = new byte[1024];    int i = -1;    while ((i = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, i);    }    outputStream.flush();} finally {    if (outputStream != null) {outputStream.close();    }    if (inputStream != null) {inputStream.close();    }}return null;