报错记录:getOutputStream() has already been called for this response

时间：2021-09-28 23:39:59

仅作记录:参考文章:http://www.blogjava.net/vickzhu/archive/2008/11/03/238337.html

　　报错信息:

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 com.zhiweidata.eventsMuseum.util.GeneralController.getJsonStrByString(GeneralController.java:50)

	at com.zhiweidata.eventsMuseum.controller.DownEventController.downMediaData(DownEventController.java:341)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:606)

	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)

	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)

	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729)

	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)

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

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)

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

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

	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.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	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.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)

	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)

　　

　　在从数据库中读取数据写入到EXcel中,然后写入失败返回一串JSON给前端:

{

　　state: "账户余额不足!"

}

　　导致response两次写入报错

　　在第二次写入时加上:

　　response.reset();

　　

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