使用 Digester 来解析 RDF/RSS/ATOM 数据，digesterrdf,/** * XMLDi

使用 Digester 来解析 RDF/RSS/ATOM 数据，digesterrdf,/** * XMLDi

/** *  XMLDigester.java *   *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU Library General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *   *  Author: Winter Lau (javayou@gmail.com) *  <a href="http://dlog4j.sourceforge.net">http://dlog4j.sourceforge.net */package com.dlog4j.rss;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.net.URL;import org.apache.commons.digester.Digester;import org.xml.sax.InputSource;import org.xml.sax.SAXException;/** * 通用的解析RDF,RSS,ATOM的类 * @author Winter Lau */public class XMLDigester extends Digester {    /**     * Have we been configured yet?     */    protected boolean configured = false;    /**     * The set of public identifiers, and corresponding resource names,     * for the versions of the DTDs that we know about.     */    protected static final String registrations[] = {        "-//Netscape Communications//DTD RSS 0.9//EN",        "/com/dlog4j/rss/rss-0.9.dtd",        "-//Netscape Communications//DTD RSS 0.91//EN",        "/com/dlog4j/rss/rss-0.91.dtd",    };    // --------------------------------------------------------- Public Methods    /**     * Parse the content of the specified file using this Digester.  Returns     * the root element from the object stack (which will be the Channel).     *     * @param file File containing the XML data to be parsed     *     * @exception IOException if an input/output error occurs     * @exception SAXException if a parsing exception occurs     */    public Object parse(File file) throws IOException, SAXException {        configure();        return (super.parse(file));    }    /**     * Parse the content of the specified input source using this Digester.     * Returns the root element from the object stack (which will be the     * Channel).     *     * @param input Input source containing the XML data to be parsed     *     * @exception IOException if an input/output error occurs     * @exception SAXException if a parsing exception occurs     */    public Object parse(InputSource input) throws IOException, SAXException {        configure();        return (super.parse(input));    }    /**     * Parse the content of the specified input stream using this Digester.     * Returns the root element from the object stack (which will be     * the Channel).     *     * @param input Input stream containing the XML data to be parsed     *     * @exception IOException if an input/output error occurs     * @exception SAXException if a parsing exception occurs     */    public Object parse(InputStream input) throws IOException, SAXException {        configure();        return (super.parse(input));    }    /**     * Parse the content of the specified URI using this Digester.     * Returns the root element from the object stack (which will be     * the Channel).     *     * @param uri URI containing the XML data to be parsed     *     * @exception IOException if an input/output error occurs     * @exception SAXException if a parsing exception occurs     */    public Object parse(String uri) throws IOException, SAXException {        configure();        return (super.parse(uri));    }    // -------------------------------------------------------- Package Methods    // ------------------------------------------------------ Protected Methods    /**     * Configure the parsing rules that will be used to process RSS input.     */    protected void configure() {        if (configured) return;                // Register local copies of the DTDs we understand        for (int i = 0; i < registrations.length; i += 2) {            URL url = this.getClass().getResource(registrations[i + 1]);            if (url != null) {                register(registrations[i], url.toString());            }        }        setNamespaceAware(true);        setValidating(false);        // rdf        addObjectCreate("RDF", Channel.class);        addBeanPropertySetter("RDF/channel/title","title");        addBeanPropertySetter("RDF/channel/link","link");        addBeanPropertySetter("RDF/channel/description","description");        addObjectCreate("RDF/item", ChannelItem.class);        addSetNext("RDF/item","addItem");             addBeanPropertySetter("RDF/item/title","title");        addBeanPropertySetter("RDF/item/link","link");        addBeanPropertySetter("RDF/item/description","description");        // rss        addObjectCreate("rss", Channel.class);        addBeanPropertySetter("rss/channel/title","title");        addBeanPropertySetter("rss/channel/link","link");        addBeanPropertySetter("rss/channel/description","description");        addObjectCreate("rss/channel/item", ChannelItem.class);        addSetNext("rss/channel/item","addItem");             addBeanPropertySetter("rss/channel/item/title","title");        addBeanPropertySetter("rss/channel/item/link","link");        addBeanPropertySetter("rss/channel/item/pubDate","pubDate");        addBeanPropertySetter("rss/channel/item/description","description");                // atom        addObjectCreate("feed", Channel.class);        addBeanPropertySetter("feed/title","title");        addSetProperties("feed/link","href","link");        addBeanPropertySetter("feed/info","description");        addObjectCreate("feed/entry", ChannelItem.class);        addSetNext("feed/entry","addItem");             addBeanPropertySetter("feed/entry/title","title");        addSetProperties("feed/entry/link","href","link");        addBeanPropertySetter("feed/entry/content","description");        // Mark this digester as having been configured        configured = true;    }}//该片段来自于http://byrx.net