Wicket+Atom

Tak na szybko... przy pomocy Xstream'a

1. Klasa, na podstawie której generowany będzie feed:

    @XStreamAlias("rss")  
    public class Atom {  
        @XStreamAsAttribute  
        @XStreamAlias("xmlns:atom")  
        String xmlns="http://www.w3.org/2005/Atom";  
        @XStreamAsAttribute  
        String version="2.0";  
        public channel channel=new channel();  
          
        public static class channel {  
           public String title;  
           public String subtitle;  
           public String link;  
           @XStreamAlias("atom:link")  
           public AtomLink atomLink;  
           public String language;  
           public Date lastBuildDate;  

           @XStreamImplicit(itemFieldName = "item")  
             public List entries=new ArrayList();  
          }  
          public static class AtomLink {  
             @XStreamAsAttribute  
             public String href;  
             @XStreamAsAttribute  
             public String rel="self";  
          }  
          public static class Entry {  
             public String title;  
             public String link;  
             public String description;  
             public Date pubDate;  
          }  
     }  

2. Wicket WebResource class:

   public class AtomWebResource extends WebResource {  
       public static Logger log = LoggerFactory.getLogger(AtomWebResource.class);  
       
      @Override  
      protected int getCacheDuration() {  
          return 0;  
      }  
         
      @Override  
      public IResourceStream getResourceStream() {  
          return new AbstractResourceStreamWriter() {  
              public String getContentType() {  
                  return "text/xml; charset=UTF-8";  
              }  
              public void write(OutputStream output) {  
                  try {  
                      BufferedWriter bufferedWriter = new BufferedWriter(new PrintWriter(output));               
                      bufferedWriter.write(getAtom());  
                      bufferedWriter.flush();  
                      bufferedWriter.close();  
                  } catch (IOException e) {  
                      log.error("",e);  
                  }                    
              }              
          };  
      }  
     // w celu optymalizacji, zamiast tworzyć feeda na nowo można go cache'ować   
     private String getAtom() {  
          Atom a=new Atom();  
        a.title="Tytul";
        //... tu wypełniamy wszystkie entry
        return xstream.toXML();
   }
} 

3. Dodanie resource do aplikacji Wicket

public void init() {
    getSharedResources().add(AtomWebResource.class.getName(), new AtomWebResource());
    mountSharedResource("feed", Application.class.getName()+"/"+AtomWebResource.class.getName());           
}

4. Dodanie linkow na stronach

  add(new ResourceLink("rssLink",new ResourceReference(AtomWebResource.class.getName())));

...i w html