Jsf &引用；已为此响应调用getOutputStream（）；尝试下载生成的文件时

嗯

我使用Spring、MyFaces、Primefaces和Omnifaces构建了一个简单的应用程序。有一个功能可以使用ApachePOI生成Excel文件，并将生成的文件发送到客户端。但是，在托管Bean上，当我尝试发送文件时，我得到了一个

java.lang.IllegalStateException:getOutputStream（）已被调用用于此响应

在我的托管Bean上，我有以下方法来生成文件并将其发送到客户端：

public void exportarPlanilhaRateio() {
    try {
        Workbook wb = getFaturaTitularService().exportarRateioPlanilha(this.fatura);
        HttpServletResponse response = Faces.getResponse();
        response.setContentType("application/vnd.ms-excel");
        response.addHeader("Content-Disposition", "attachment; filename=" + this.fatura.getAnoMesReferencia() +"rateio.xls");
        OutputStream out = response.getOutputStream();
        wb.write(out);
        out.flush();
        out.close();
    }
    catch (ServiceException e) {
        logger.error("Erro ao criar planilha de rateio", e);
        this.addMessage(MENSAGEM_GLOBAL, "Erro", "Erro ao criar planilha de rateio", FacesMessage.SEVERITY_ERROR);
    }
    catch (IOException e) {
        logger.error("Erro ao preparar download planilha de rateio", e);
        this.addMessage(MENSAGEM_GLOBAL, "Erro", "Erro ao preparar download da planilha de rateio", FacesMessage.SEVERITY_ERROR);
    }
}

结束执行后，我得到以下异常：

java.lang.IllegalStateException: getOutputStream() has already been called for this response
    at org.apache.catalina.connector.Response.getWriter(Response.java:638)
    at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:214)
    at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:105)
    at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:105)
    at org.springframework.security.web.context.SaveContextOnUpdateOrErrorResponseWrapper.getWriter(SaveContextOnUpdateOrErrorResponseWrapper.java:109)
    at org.apache.myfaces.context.servlet.ServletExternalContextImpl.getResponseOutputWriter(ServletExternalContextImpl.java:185)
    at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.createResponseWriter(FaceletViewDeclarationLanguage.java:2296)
    at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1951)
    at org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:298)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:59)
    at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:116)
    at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:241)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:199)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:98)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)

我尝试了一些其他的方法，但没有成功。我尝试使用omnifaces的
Faces.sendFile（）
。没有例外，也没有成功。在托管Bean上执行后，响应永远不会返回。我在stackoverflow中搜索了其他问题，但没有一个对我有帮助。我检查了我的代码，以验证以前是否调用了
getResponse（）
，但没有找到任何内容

我错在哪里？
找到了解决方案（或我的错误）

我使用的是primefaces ajax状态。您可以在此处看到它的作用：。但是，当我尝试使用响应和ajax状态下载某些内容时，问题就出现了

我的Ajax状态：

<p:ajaxStatus onstart="statusDialog.show();" onsuccess="statusDialog.hide();"/>



我只是使用属性
ajax=“false”
在
commandLink
上禁用了ajax，一切正常

因此，当您尝试下载某些内容时，如果页面中有ajaxStatus，请不要使用ajax。
找到了解决方案（或我的错误）

我使用的是primefaces ajax状态。您可以在此处看到它的作用：。但是，当我尝试使用响应和ajax状态下载某些内容时，问题就出现了

我的Ajax状态：

<p:ajaxStatus onstart="statusDialog.show();" onsuccess="statusDialog.hide();"/>



我只是使用属性
ajax=“false”
在
commandLink
上禁用了ajax，一切正常

因此，当您尝试下载某些内容时，如果页面中有ajaxStatus，请不要使用ajax。
已经有一个。。。所以getWriter（）和getOutputStream（）不太合拍…@kiwiwings，我刚刚找到了解决方案。这与getWriter（）和getOutputStrem（）无关。getResponse（）的primefaces的ajaxStatus存在一些问题。已存在。。。所以getWriter（）和getOutputStream（）不太合拍…@kiwiwings，我刚刚找到了解决方案。这与getWriter（）和getOutputStrem（）无关。getResponse（）的primefaces的ajaxStatus存在一些问题。