jforum example source code file (rss.jsp)

This example jforum source code file (rss.jsp) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - jforum tags/keywords

date, date, iterator, no, rss, simpledateformat, string, string, stringbuffer, stringbuffer, utf-8, wikiengine, wikipage, wikipage

The jforum rss.jsp source code

<?xml version="1.0" encoding="UTF-8"?>

<%@ page import="java.util.*,com.ecyrd.jspwiki.*" %>
<%@ page import="org.apache.log4j.*" %>
<%@ page import="java.text.*" %>
<%@ page import="com.ecyrd.jspwiki.rss.*" %>
<%@ page import="com.ecyrd.jspwiki.util.*" %>
<%@ taglib uri="/WEB-INF/oscache.tld" prefix="oscache" %>

<%!
    public void jspInit()
    {
        wiki = WikiEngine.getInstance( getServletConfig() );
    }

    Logger log = Logger.getLogger("JSPWiki");
    WikiEngine wiki;
%>

<%
    // Create wiki context and check for authorization
    WikiContext wikiContext = wiki.createContext( request, "rss" );
    if(!wikiContext.hasAccess( response )) return;
    WikiPage    wikipage    = wikiContext.getPage();

    // Redirect if baseURL not set or RSS generation not on
    if( wiki.getBaseURL().length() == 0 )
    {
        response.sendError( 500, "The jspwiki.baseURL property has not been defined for this wiki - cannot generate RSS" );
        return;
    }
    
    if( wiki.getRSSGenerator() == null )
    {
        response.sendError( 404, "RSS feeds are disabled at administrator request" );
        return;
    }

    if( wikipage == null || !wiki.pageExists(wikipage.getName()) )
    {
        response.sendError( 404, "No such page "+wikipage.getName() );
        return;
    }

    // Set the mode and type for the feed
    String      mode        = request.getParameter("mode");
    String      type        = request.getParameter("type");
    
    if( mode == null || !(mode.equals(RSSGenerator.MODE_BLOG) || mode.equals(RSSGenerator.MODE_WIKI)) ) 
    	   mode = RSSGenerator.MODE_BLOG;
    if( type == null || !(type.equals(RSSGenerator.RSS10) || type.equals(RSSGenerator.RSS20) || type.equals(RSSGenerator.ATOM)) ) 
    	   type = RSSGenerator.RSS20;
    
    // Force the TranslatorReader to output absolute URLs
    // regardless of the current settings.
    wikiContext.setVariable( WikiEngine.PROP_REFSTYLE, "absolute" );

    // Set the content type and include the response content
    response.setContentType( RSSGenerator.getContentType(type)+"; charset=UTF-8");

    StringBuffer result = new StringBuffer();
    SimpleDateFormat iso8601fmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

    Properties properties = wiki.getWikiProperties();
    String channelDescription = wiki.getRequiredProperty( properties, RSSGenerator.PROP_CHANNEL_DESCRIPTION );
    String channelLanguage    = wiki.getRequiredProperty( properties, RSSGenerator.PROP_CHANNEL_LANGUAGE );

    //
    //  Now, list items.
    //
    List changed;
    
    if( mode.equals("blog") )
    {
        com.ecyrd.jspwiki.plugin.WeblogPlugin plug = new com.ecyrd.jspwiki.plugin.WeblogPlugin();
        changed = plug.findBlogEntries(wiki.getPageManager(), 
                                       wikipage.getName(),
                                       new Date(0L),
                                       new Date());
    }
    else
    {
        changed = wiki.getVersionHistory( wikipage.getName() );
    }
    
    //
    //  Check if nothing has changed, so we can just return a 304
    //
    boolean hasChanged = false;
    Date    latest     = new Date(0);

    for( Iterator i = changed.iterator(); i.hasNext(); )
    {
        WikiPage p = (WikiPage) i.next();

        if( !HttpUtil.checkFor304( request, p ) ) hasChanged = true;
        if( p.getLastModified().after( latest ) ) latest = p.getLastModified();
    }

    if( !hasChanged && changed.size() > 0 )
    {
        response.sendError( HttpServletResponse.SC_NOT_MODIFIED );
        return;
    }

    response.addDateHeader("Last-Modified",latest.getTime());
    response.addHeader("ETag", HttpUtil.createETag(wikipage) );
%>
<%-- 
<%
    out.println(wiki.getRSSGenerator().generateFeed( wikiContext, changed, mode, type ));
%>
<%--