【已解决】使用easy-poi实现导入excel功能，报错 getWriter() has already been called for this response] with root cause

@[TOC]( [已解决]getWriter() has already been called for this response] with root cause)

【已解决】使用easy-poi实现导入excel功能，报错 getWriter() has already been called for this response] with root cause，影响导出excel

在项目中，需要导出查询数据为excel，在本地使用idea测试没有问题。但在测试环境，相同代码，报错** “getWriter() has already been called for this response] with root cause” **，影响下载功能。
【未彻底解决该问题】报错仍然没有解决，在研究中，但已经解决无法下载的问题。

报错截图

分析报错

通过对报错信息的分析，关键就是流信息重复开

解决方法

原来代码

private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws Exception {
        OutputStream outputStream=null;
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            //response.flushBuffer();
            outputStream = response.getOutputStream();
            workbook.write(outputStream);
        } catch (IOException e) {
            throw new ServiceException(ResponseEnum.EXCEPTION_FILE_IO);
        }finally {
            try {
                if(outputStream!=null){
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

修改后的代码

private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws Exception {
        OutputStream outputStream=null;
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            //-------------重点------------
            response.flushBuffer();
            //--------------重点----------
            outputStream = response.getOutputStream();
            workbook.write(outputStream);
        } catch (IOException e) {
            throw new ServiceException(ResponseEnum.EXCEPTION_FILE_IO);
        }finally {
            try {
                if(outputStream!=null){
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

请看注释"-----重点--------"部分

报错问题未解决，研究中，谢谢