利用Java得到RSS源的内容

利用Java得到RSS源的内容

 

WebClient和WebResponse类，见文章http://blog.csdn.net/gtuu0123/archive/2009/12/06/4949087.aspx

 

IRSSParser.java

public interface IRSSParser {RSSChannel parseRSS() throws RSSException;}

 

RSSChannel.java   (对应<channel>标签)

public class RSSChannel implements Serializable {private Map<String, String> kv;private List<RSSItem> items;public RSSChannel() {kv = new HashMap<String, String>();items = new ArrayList<RSSItem>();}public List<RSSItem> getItems() {return items;}public void addItems(RSSItem item) {items.add(item);}public void set(String key, String value) {kv.put(key, value);}public String get(String key) {return kv.get(key);}public String toString() {StringBuilder sb = new StringBuilder();sb.append("[/n");Set<String> keySet = kv.keySet();Iterator<String> keyIter = keySet.iterator();while(keyIter.hasNext()) {String key = keyIter.next();String value = kv.get(key);sb.append(key + "=" + value + "/n");}for (int i = 0; i < items.size(); i++) {RSSItem item = items.get(i);sb.append(item.toString() + "/n");}sb.append("]/n");return sb.toString();}}

 

RSSItem.java  (对应<item>标签)

public class RSSItem implements Serializable {private Map<String, String> kv;public RSSItem() {kv = new HashMap<String, String>();}public void set(String key, String value) {kv.put(key, value);}public String get(String key) {return kv.get(key);}public String toString() {StringBuilder sb = new StringBuilder();sb.append("[/n");Set<String> keySet = kv.keySet();Iterator<String> keyIter = keySet.iterator();while(keyIter.hasNext()) {String key = keyIter.next();String value = kv.get(key);sb.append(key + "=" + value + "/n");}sb.append("]");return sb.toString();}}

 

RSSException.java

public class RSSException extends Exception {public RSSException() {super();}public RSSException(Throwable t) {super(t);}public RSSException(String error) {super(error);}public RSSException(String error, Throwable t) {super(error, t);}}

 

DefaultRSSParser.java

public class DefaultRSSParser implements IRSSParser {private static final Log logger = LogFactory.getLog(DefaultRSSParser.class);private String url;private WebClient browser = new WebClient();public DefaultRSSParser(String url) {this.url = url;}private Document createDOMDocument() throws RSSException {try {WebResponse rssResp = browser.doGet(url);String encoding = rssResp.getEncoding();String rssContent = rssResp.getBodyAsString();DocumentBuilderFactory docBuilderFac = DocumentBuilderFactory.newInstance();DocumentBuilder docBuilder = docBuilderFac.newDocumentBuilder();InputSource is = new InputSource(new ByteArrayInputStream(rssContent.getBytes(encoding)));Document doc = docBuilder.parse(is);return doc;} catch (Exception e) {logger.error("CreateDOMDocument Error", e);throw new RSSException("CreateDOMDocument Error", e);}}private RSSChannel parseForChannel(Document doc) {RSSChannel rssChannel = new RSSChannel();NodeList channelNodeList = doc.getElementsByTagName("channel");Node channel = channelNodeList.item(0);NodeList childsOfChannel = channel.getChildNodes();for (int i = 0; i < childsOfChannel.getLength(); i++) {Node childOfChannel = childsOfChannel.item(i);if (childOfChannel.getNodeType() != Node.TEXT_NODE) {String nodeName = childOfChannel.getNodeName();if (!nodeName.equals("item")) {String name = childOfChannel.getNodeName();String value = childOfChannel.getTextContent();rssChannel.set(name, value);}}}return rssChannel;}private List<RSSItem> parseForItem(Document doc) {List<RSSItem> rssItems = new ArrayList<RSSItem>();NodeList itemNodeList = doc.getElementsByTagName("item");for (int i = 0; i < itemNodeList.getLength(); i++) {RSSItem rssItem = new RSSItem();Node item = itemNodeList.item(i);NodeList childsOfItem = item.getChildNodes();for (int j = 0; j < childsOfItem.getLength(); j++) {Node node = childsOfItem.item(j);if (node.getNodeType() != Node.TEXT_NODE) {String name = node.getNodeName();String value = node.getTextContent();rssItem.set(name, value);}}rssItems.add(rssItem);}return rssItems;}public RSSChannel parseRSS() throws RSSException {Document doc = createDOMDocument();RSSChannel channel = parseForChannel(doc);List<RSSItem> items = parseForItem(doc);for (int i = 0; i < items.size(); i++) {channel.addItems(items.get(i));}return channel;}}

 

RSSTest.java

public class RSSTest {public static void main(String[] args) {try {//String url = "http://blog.sina.com.cn/rss/daodaodog.xml";String url = "http://rss.sina.com.cn/tech/rollnews.xml";IRSSParser parser = new DefaultRSSParser(url);RSSChannel channel = parser.parseRSS();System.out.println(channel.toString());} catch (RSSException e) {e.printStackTrace();}}}