Wicket でExcel生成ダウンロード

Wicket で jakarta-POI で生成したExcel2007 をWebアプリでダウンロードさせる時の ContentType は、

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Wicket の例では、ダウンロードのボタンの onSubmit() に
org.apache.wicket.util.resource.IResourceStream 実装として
public String getContentType() の戻り値にこれを返すようにする。

拡張子xls の Excel2003 でも可能だった。

http://www.microsoft.com/japan/technet/prodtechnol/office/ork/library/f88d06fb-c9a4-413c-a1d3-40c97e340c5a.mspx?mfr=true

必要なJAR は、以下。
poi-3.6-20091214.jar
poi-ooxml-3.6-20091214.jar
poi-ooxml-schemes-3.6-20091214.jar
dom4j-1.6.1.jar
xmlbeans-2.3.0.jar
------------------------ 実装例 ------------------------------
public class ExcelTestPage extends WebPage{
   public ExcelTestPage(){
      Form<Void> form = new Form<Void>("downloadForm");
      add(form);
      final TextField<String> message = new TextField<String>("message"
              ,new Model<String>("サンプル"));
      form.add(message);
      Button download = new Button("download"){
         @Override
         public void onSubmit(){
            IResourceStream resource = new AbstractResourceStreamWriter(){
               @Override
               public void write(OutputStream output){
                  String templateName = "template.xlsx";
                  InputStream input = ExcelPage.class.getResourceAsStream(templateName);
                  try{
                  Workbook workbook = WorkbookFactory.create(input);
                  Sheet sheet = workbook.getSheetAt(0);
                  this.writeCell(sheet,0,0,message.getDefaultModelObjectAsString());
                  }catch(InvalidFormatException e){
                     e.printStackTrace();
                  }catch(IOException e){
                     e.printStackTrace();
                  }
               }
               @Override
               public String getContentType() {
                  return "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
               }
               private void writeCell(Sheet sheet,int rownum,int colnum,String data){
                  Row row = sheet.getRow(rownum);
                  if (row==null) row = sheet.createRow(rownum);
                  Cell cell = row.getCell(colnum);
                  if (cell==null) cell = row.createCell(colnum);
                  cell.setCellValue(data);
                  cell.setCellStyle(this.cellstyle);
               }
            };
            String downloadName = "download.xlsx";
            IRequestTarget target = new ResourceStreamRequestTarget(resource,downloadName);
            getRequestCycle().setRequestTarget(target);
         }
      };
      form.add(download);
   }
}