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POExport to Excel JSF and PrimeFaces
 

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    <p>Using JDK 1.6, JSF 2.1, PrimeFaces 2.2.1, POI 3.2, and Apache Tomcat 7</p> <p>I am trying to setup a servlet to allow a download of an excel file based on the user selection. The excel document is created at runtime.</p> <p>No errors and the code does get into the servlet. </p> <p>I click the button and nothing happens. I am not using the datatable export that PrimeFaces uses because I need to do reordering and custom formatting on the data in the Excel document.</p> <p>ExportExcelReports.java</p> <pre><code>protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("application/vnd.ms-excel"); response.setHeader("Content-Disposition", "attachment; filename=\"my.xls\""); HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet(); HSSFRow row = sheet.createRow(0); HSSFCell cell = row.createCell(0); cell.setCellValue(0.0); FileOutputStream out = new FileOutputStream("my.xls"); workbook.write(out); out.close(); } </code></pre> <p>ProjectReportBean.java</p> <pre><code>public void getReportData() { try { FacesContext ctx = FacesContext.getCurrentInstance(); ExternalContext ectx = ctx.getExternalContext(); HttpServletRequest request = (HttpServletRequest) ectx.getRequest(); HttpServletResponse response = (HttpServletResponse) ectx.getResponse(); RequestDispatcher dispatcher = request.getRequestDispatcher("/ExportExcelReports"); dispatcher.forward(request, response); ctx.responseComplete(); } catch (Exception e) {} } </code></pre> <p>index.xhtml</p> <pre><code>&lt;h:form id="reportsForm"&gt; &lt;h:outputLabel for="report" value="Reports" /&gt;&lt;br /&gt; &lt;h:selectOneMenu id="report" value="#{projectReportBean.selectedReport}" required="true" requiredMessage="Select Report"&gt; &lt;f:selectItem itemLabel="---" noSelectionOption="true" /&gt; &lt;f:selectItems value="#{projectReportBean.reports}" /&gt; &lt;/h:selectOneMenu&gt; &lt;p:commandButton action="#{projectReportBean.getReportData}" value="Export" update="revgrid" /&gt; &lt;/h:form&gt; </code></pre>
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