getOutputStream() has already been called for this response

Question

1:做数据导出为excel的时候出现这个问题
java.lang.IllegalStateException: getOutputStream() has already been called for this response
2：controller里面的方法

3：service里面的方法

4：数据大概有20万条

Answer 1

有更详细的异常信息没，你提供的代码片段看不出什么问题。