File	Doc	Category	Size	Date	Package
GetRSSChannelServlet.java	API Doc	Example	6808	Sat Jun 03 18:32:50 BST 2000	com.techbooks

GetRSSChannelServlet

• java.lang.Object
  • javax.servlet.GenericServlet
    • javax.servlet.http.HttpServlet

Fields Summary
private static final String	hostname Host to connect to for books list
private static final int	portNumber Port number to connect to for books list
private static final String	file File to request (URI path) for books list

Constructors Summary

Methods Summary
private java.lang.String	generateRSSContent(org.jdom.Document doc) This will generate an RSS XML document using the supplied JDOM Document. param doc Document to use for input. return String - RSS file to output. throws JDOMException when errors occur. StringBuffer rss = new StringBuffer(); rss.append("<?xml version=\"1.0\"?>\n") .append("<!DOCTYPE rss PUBLIC ") .append("\"-//Netscape Communications//DTD RSS 0.91//EN\" ") .append("\"http://my.netscape.com/publish/formats/rss-0.91.dtd\">\n") .append("<rss version=\"0.91\">\n") .append(" <channel>\n") .append(" <title>Technical Books</title>\n") .append(" <link>http://newInstance.com/javaxml/techbooks</link>\n") .append(" <description>\n") .append(" Your online source for technical materials, computers, ") .append("and computing books!\n") .append(" </description>\n") .append(" <language>en-us</language>\n") .append(" <image>\n") .append(" <title>mytechBooks.com</title>\n") .append(" <url>") .append("http://newInstance.com/javaxml/techbooks/images/techbooksLogo.gif") .append("</url>\n") .append(" <link>http://newInstance.com/javaxml/techbooks</link>\n") .append(" <width>140</width>\n") .append(" <height>23</height>\n") .append(" <description>\n") .append(" Your source on the Web for technical books.\n") .append(" </description>\n") .append(" </image>\n"); // Add an item for each new title with Computers as subject List books = doc.getRootElement().getChildren("book"); for (Iterator i = books.iterator(); i.hasNext(); ) { Element book = (Element)i.next(); if (book.getAttribute("subject") .getValue().equals("Computers")) { // Output an item rss.append("<item>\n") // Add title .append(" <title>") .append(book.getChild("title").getContent()) .append("</title>\n") // Add link to buy book .append(" <link>") .append("http://newInstance.com/javaxml/techbooks/buy.xsp?isbn=") .append(book.getChild("saleDetails") .getChild("isbn") .getContent()) .append("</link>\n") .append(" <description>") // Add description .append(book.getChild("description").getContent()) .append("</description>\n") .append("</item>\n"); } } rss.append(" </channel>\n") .append("</rss>"); return rss.toString();
public void	service(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) res.setContentType("text/plain"); PrintWriter out = res.getWriter(); // Connect and get XML listing of books URL getBooksURL = new URL("http", hostname, portNumber, file); InputStream in = getBooksURL.openStream(); try { // Request SAX Implementation and use default parser Builder builder = new SAXBuilder(); // Create the document Document doc = builder.build(in); // Output XML out.println(generateRSSContent(doc)); } catch (JDOMException e) { out.println("Error: " + e.getMessage()); } finally { out.close(); }