错误java.lang.IllegalStateException: getWriter() has already been called for this response

今天遇到一个错误：Caused by: java.lang.IllegalStateException: getWriter() has already been called for this response

原因是：
response同时只能使用getOutputStream和getWriter的一个方法（OutputStream和Writer在一个response中不能同时获得）。

细节可以查看：
https://blog.csdn.net/li396864285/article/details/78122296