利用RSSLibJ读取RSS .

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RSS是一个标准的XML文件，Rss阅读器可以读取这个XML文件获得文章的信息，使用户可以通过Rss阅读器而非浏览器阅读Blog，我们只要动态生成这个XML文件便可以了。RSSLibJ是一个专门读取和生成RSS的小巧实用的Java库，大小仅25k，可以下载rsslibj-1_0RC2.jar和它需要的EXMLjar两个文件，然后复制到/WEB-INF/lib/下。

rsslibj-1_0RC2.jar下载地址：http://sourceforge.net/project/downloading.php?group_id=71153&use_mirror=nchc&filename=rsslibj-1_0RC2.jar&27763931

EXML.jar下载地址：http://rsslibj.cvs.sourceforge.net/rsslibj/rsslibj/lib/EXML.jar?view=log

<%@taglib uri="http://java.sun.com/jsf/core" prefix="f"%><%@taglib uri="http://java.sun.com/jsf/html" prefix="h"%><%@page contentType="text/html;charset=gb18030"%><f:view><html><body><h:form><h3>RSS Reader</h3> 请输入RSS地址： <h:inputText value="#{rssReader.rssAddress }" id="rssAddress"converterMessage="请输入一个正确的Rss地址!" style="width:280px;"></h:inputText><h:commandButton value="提交" action="#{rssReader.readRss }"></h:commandButton><br><br><h:message for="rssAddress" style="color:red;"></h:message></h:form><br><br>从<h:outputText value="#{rssReader.rssAddress }"></h:outputText>获取的内容：<br><h:form><h:dataTable value="#{rssReader.items }" var="item" style="font-size:13px;" border="1"><h:column><h:outputText value="#{item.title }"></h:outputText></h:column> <h:column><h:outputLink value="#{item.link }"><h:outputText value="#{item.link }"></h:outputText></h:outputLink></h:column></h:dataTable></h:form></body></html></f:view>

RSSReader.java:

package com.rss;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;import java.util.Properties;import com.rsslibj.elements.Channel;import com.rsslibj.elements.Item;import com.rsslibj.elements.RSSReader;import electric.xml.ParseException;public class RssReader {private static final String urlString =  "http://rss.sina.com.cn/news/marquee/ddt.xml";private List<Item> items;private String rssAddress;private String proxyHost = "paicproxy2";private String proxyPort = "8080";public String getRssAddress() {return this.rssAddress;}public void setRssAddress(String rssAddress) {this.rssAddress = rssAddress;}public List<Item> getItems() {return this.items;}/** * 设置代理 */public void setProxy(String proxyHost,String proxyPort) {// 设置代理Properties systemSettings = System.getProperties();systemSettings.put("http.proxyHost", proxyHost);systemSettings.put("http.proxyPort", proxyPort);System.setProperties(systemSettings);} /**     * 读取RSS。     * @param url     * @throws IOException      * @throws ParseException      */    public void readRss() throws IOException, ParseException {    setProxy(proxyHost, proxyPort);        URL __url = new URL(this.rssAddress);    HttpURLConnection conn = (HttpURLConnection) __url.openConnection();    InputStream in = conn.getInputStream();    BufferedReader bufReader = new BufferedReader(new InputStreamReader(in,"utf-8"));    RSSReader rssReader = new RSSReader(bufReader);    Channel channel = rssReader.getChannel();    this.items = channel.getItems();    }        /**     * 打印获取的RSS内容。     * @param urlString     */    public void test(String urlString) {    setProxy(urlString, urlString);try {URL url = new URL(urlString);HttpURLConnection conn = (HttpURLConnection) url.openConnection();InputStream is = conn.getInputStream();StringBuilder sBuilder = new StringBuilder();String line = null;BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8"));while ((line = reader.readLine()) != null) {sBuilder.append(line).append("\n");}System.out.println(sBuilder.toString());} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}    }}

faces-config.xml:

<?xml version="1.0"?> <!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN" "http://java.sun.com/dtd/web-facesconfig_1_0.dtd"><faces-config><managed-bean><managed-bean-name>rssReader</managed-bean-name><managed-bean-class>com.rss.RssReader</managed-bean-class><managed-bean-scope>request</managed-bean-scope></managed-bean></faces-config>