springmvc 监听器getWriter() has already been called for this response问题

springmvc 监听器getWriter() has already been called for this response问题

在监听器中，如果return true，就不要使用

response.getWriter().write("<h1 align='center'>no permission</h1>");

方法；

这样就会产生两次getWriter()调用的问题；