如何修复“getOutputStream() 已为此响应调用”

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【中文标题】如何修复“getOutputStream() 已为此响应调用”【英文标题】:how to fix "getOutputStream() has already been called for this response" 【发布时间】:2019-10-10 01:58:42 【问题描述】:

当我想将数据从数据库导出到 Excel 文件时,我收到以下异常“java.lang.IllegalStateException:getOutputStream() 已为此响应调用”。

/**** 服务****/

@Component("articleExporter")
public class ArticleExporter implements FileExporter

    @Autowired
    private IArticleService articleService;

    private static final String FILE_NAME="Liste des articles";

    @Override
    public boolean exportDataToExcel(HttpServletResponse response, String filename, String encodage) 
        if(org.apache.commons.lang3.StringUtils.isEmpty(filename)) 
            filename=FILE_NAME;

        
        if(StringUtils.isEmpty(encodage)) 
            encodage=ApplicationConstants.DEFAULT_ENCODAGE;
        
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment; filename="+ filename +".xls");
        WorkbookSettings workbookSettings = new WorkbookSettings();
        workbookSettings.setEncoding("ISO-8859-1");
        try 
            WritableWorkbook workbook = Workbook.createWorkbook(response.getOutputStream(), workbookSettings);
            WritableSheet sheet = workbook.createSheet(filename, 0);
            /**
             * Header of the table
             * */

            Label labelRubrique = new Label(0, 0, ApplicationConstants.RUBRIQUE);
            labelRubrique.setCellFeatures(new WritableCellFeatures());
            labelRubrique.getCellFeatures().setComment("");
            sheet.addCell(labelRubrique);

            Label labelFournisseur = new Label(1, 0, ApplicationConstants.FOURNISSEUR);
            labelFournisseur.setCellFeatures(new WritableCellFeatures());
            labelFournisseur.getCellFeatures().setComment("");
            sheet.addCell(labelFournisseur);

            Label labelcode = new Label(2, 0, ApplicationConstants.CODE);
            labelcode.setCellFeatures(new WritableCellFeatures());
            labelcode.getCellFeatures().setComment("");
            sheet.addCell(labelcode);

            Label labelReference = new Label(3, 0, ApplicationConstants.REFRENCE);
            labelReference.setCellFeatures(new WritableCellFeatures());
            labelReference.getCellFeatures().setComment("");
            sheet.addCell(labelReference);

            Label labelReferenceProtronic = new Label(4, 0, ApplicationConstants.REFERENCE_PROTRONIC);
            labelReferenceProtronic.setCellFeatures(new WritableCellFeatures());
            labelReferenceProtronic.getCellFeatures().setComment("");
            sheet.addCell(labelReferenceProtronic);

            Label labelDesignationL = new Label(5, 0, ApplicationConstants.DESIGNATION_L);
            labelDesignationL.setCellFeatures(new WritableCellFeatures());
            labelDesignationL.getCellFeatures().setComment("");
            sheet.addCell(labelDesignationL);

            Label labelDesignationC = new Label(6, 0, ApplicationConstants.DESIGNATION_C);
            labelDesignationC.setCellFeatures(new WritableCellFeatures());
            labelDesignationC.getCellFeatures().setComment("");
            sheet.addCell(labelDesignationC);

            Label labelPrixUnitaireHT = new Label(7, 0, ApplicationConstants.PRIX_UNIT_HT);
            labelPrixUnitaireHT.setCellFeatures(new WritableCellFeatures());
            labelPrixUnitaireHT.getCellFeatures().setComment("");
            sheet.addCell(labelPrixUnitaireHT);

            Label labelQuantite = new Label(8, 0, ApplicationConstants.QUANTITE);
            labelQuantite.setCellFeatures(new WritableCellFeatures());
            labelQuantite.getCellFeatures().setComment("");
            sheet.addCell(labelQuantite);

            Label labelPrixUnitaireTTC = new Label(9, 0, ApplicationConstants.PRIX_UNIT_TTC);
            labelPrixUnitaireTTC.setCellFeatures(new WritableCellFeatures());
            labelPrixUnitaireTTC.getCellFeatures().setComment("");
            sheet.addCell(labelPrixUnitaireTTC);

            Label labelTauxTVA = new Label(10, 0, ApplicationConstants.TAUX_TVA);
            labelTauxTVA.setCellFeatures(new WritableCellFeatures());
            labelTauxTVA.getCellFeatures().setComment("");
            sheet.addCell(labelTauxTVA);

            int currentRow =1;
            List<Article>  listArticles = articleService.selectAll();
            if(/*listArticles !=null &*/ !listArticles.isEmpty()) 
                /**
                 * Writing in the sheet
                 */
                for (Article article : listArticles) 

                    sheet.addCell(new Label(0,currentRow,article.getRubrique().getDesignation()));
                    sheet.addCell(new Label(1,currentRow,article.getFournisseur().getNomFournisseur()));
                    sheet.addCell(new Label(2,currentRow,article.getCodeArt()));
                    sheet.addCell(new Label(3,currentRow,article.getRefArt()));
                    sheet.addCell(new Label(4,currentRow,article.getRefArtPro()));
                    sheet.addCell(new Label(5,currentRow,article.getDesignationL()));
                    sheet.addCell(new Label(6,currentRow,article.getDesignationC()));
                    sheet.addCell(new Label(7,currentRow,article.getPrixUnitaireHT().toString()));
                    sheet.addCell(new Label(8,currentRow,article.getQuantite().toString()));
                    sheet.addCell(new Label(9,currentRow,article.getPrixUnitaireTTC().toString()));
                    sheet.addCell(new Label(10,currentRow,article.getTauxTva().toString()));
                    currentRow++;
                    
                CellView cellView= new CellView();
                cellView.setAutosize(true);
                //cellView.setSize(600);
                sheet.setColumnView(0, cellView);
                sheet.setColumnView(1, cellView);
                sheet.setColumnView(2, cellView);
                sheet.setColumnView(3, cellView);
                sheet.setColumnView(4, cellView);
                sheet.setColumnView(5, cellView);
                sheet.setColumnView(6, cellView);
                sheet.setColumnView(7, cellView);
                sheet.setColumnView(8, cellView);
                sheet.setColumnView(9, cellView);
                sheet.setColumnView(10, cellView);

                /**
                 * Write to excel sheet
                 */

                workbook.write();

                /**
                 * Closing the workbook
                 */

                workbook.close();

                response.getOutputStream().flush();
                response.getOutputStream().close();

            
            return true;

        catch(Exception e)
             e.printStackTrace();
             return false;

        

    

/* the controller */

@RequestMapping(value="/export/")
public String ExportArticles(HttpServletResponse response) 

        exporter.exportDataToExcel(response, null, null);
        return "article/article";

/* 错误 */

java.lang.IllegalStateException: "getOutputStream()" 似曾相识 在 org.apache.catalina.connector.Response.getWriter(Response.java:582) 在 org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:227) 在 org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:115) 在 org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:108) 在 org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:179) 在 org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:120) 在 org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:75) 在 org.apache.jsp.WEB_002dINF.views.article.article_jsp._jspService(article_jsp.java:406) 在 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 在 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) 在 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) 在 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 在 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 在 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712) 在 org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:459) 在 org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384) 在 org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) 在 org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) 在 org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262) 在 org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180) 在 org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950) 在 org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) 在 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 在 org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778) 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:634) 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 在 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) 在 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) 在 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) 在 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) 在 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) 在 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) 在 org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) 在 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) 在 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) 在 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) 在 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) 在 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834) 在 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) 在 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 在 java.util.concurrent.ThreadPoolExecutor.runWorker(未知来源) 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(未知来源) 在 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 在 java.lang.Thread.run(Unknown Source)

【问题讨论】:

【参考方案1】:

当你打电话给workbook.write(); workbook.close();时,它已经在做

response.getOutputStream().flush();
response.getOutputStream().close();

所以抛出异常,去掉那几行就OK了。

【讨论】:

我试图删除那两行,但问题仍然存在,抛出异常。【参考方案2】:

似乎错误是从 Catalina (Tomcat) 内部引发的。我假设 Catalina 尝试刷新并关闭响应的输出流本身,但您已经关闭了它。

如果您删除了 response.getOutputStream().close(); 调用和 workbook.close; 调用,那么它是否可以工作,从而让输出流打开以便 catalina 刷新和关闭?

【讨论】:

我也试过了,但还是抛出了异常。

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