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

在做报表导出的时，导出报表后服务器提示：

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

at org.apache.catalina.connector.Response.getWriter(Response.java:662)

at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:213)

at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:104)

at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)

at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)

at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:186)

at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:126)

at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:80)

at org.apache.jsp.service.canteen_005fcomp_005fdetail_005freport_jsp._jspService(canteen_005fcomp_005fdetail_005freport_jsp.java:388)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:747)

at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:603)

at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:542)

at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:160)

at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)

at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1244)

at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1027)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:971)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)

at org.apache..JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

解决方法：在jsp中添加：

out.clearBuffer();

out = pageContext.pushBody();

但这样写的话，进入页面时，页面会一片空白，因此，使用了比较笨的方法，session。

这样做out的设置就不会对初始化的jsp产生影响了