Activiti導出模型文件xml(xml文件超過10K)

Activiti導出超過10K的xml文件時，response 要在獲取輸出流之前設置header格式

原代碼為：

ByteArrayInputStream in = new ByteArrayInputStream(exportBytes);

IOUtils.copy(in, response.getOutputStream());

response.setHeader("Content-Disposition", "attachment; filename="+ filename);

response.flushBuffer();

修改后，代碼為：

ByteArrayInputStream in = new ByteArrayInputStream(exportBytes);

response.setHeader("Content-Disposition", "attachment; filename="+ filename);

IOUtils.copy(in, response.getOutputStream());

response.flushBuffer();