getWriter() has already been called for this response 的解决办法

潇洒

发布于 2023-10-20 12:23:26

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代码可运行

文章被收录于专栏：石头岛

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代码可运行

问题

在使用springboot时，发现有个同事报了一个错：

getWriter() has already been called for this response 错误提示也比较明显，是被调用过了。

出错的部分代码如下：

try {
  //有问题的部份
  //PrintWriter out = null;
  //out = response.getWriter();
  //String json = new ObjectMapper().writeValueAsString(map);
  //out.write(json);
  //out.flush();
  //out.close();
  
  outputStream = response.getOutputStream();
  String json = new ObjectMapper().writeValueAsString(map);
  outputStream.write(json.getBytes());
  outputStream.flush();
  outputStream.close();
} catch (IOException e) {
  LOGGER.error(e.getMessage(), e);
} finally {
  if (outputStream != null) {
    try {
      outputStream.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

注释部份为有问题的写法。