getWriter()和getOutputStream()不能同时调用
HTTP Status 500 ? Internal Server Error
Type Exception Report
Message getWriter() has already been called for this response
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
java.lang.IllegalStateException: getWriter() has already been called for this response org.apache.catalina.connector.Response.getOutputStream(Response.java:590) org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:194) com.itheima.content.ErrorServlet.doGet(ErrorServlet.java:34) javax.servlet.http.HttpServlet.service(HttpServlet.java:635) javax.servlet.http.HttpServlet.service(HttpServlet.java:742) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Note The full stack trace of the root cause is available in the server logs.