1.通过Rome插件可以简化对这两种规范文件的解析难度！Rss,Atom一般用在网站订阅功能，可以实现网络资源共享，用户可以通过客户端软件直接浏览各大网站已订阅的文章。简单的来说，电子订阅的特点就是，可以将多个网站上频繁更新的内容如：博客，新闻，聚合到一个网页列表上。ff可以下载sage插件解析，IE7可以直接解析。以下是读写操作的代码示例：
package rss;import java.io.FileWriter;import java.io.Writer;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import com.sun.syndication.feed.synd.SyndContent;import com.sun.syndication.feed.synd.SyndContentImpl;import com.sun.syndication.feed.synd.SyndEntry;import com.sun.syndication.feed.synd.SyndEntryImpl;import com.sun.syndication.feed.synd.SyndFeed;import com.sun.syndication.feed.synd.SyndFeedImpl;import com.sun.syndication.io.SyndFeedOutput;public class RssWrite { public static void main(String[] args) throws Exception { DateFormat dateParser = new SimpleDateFormat("yyyyMMddhhmmss"); SyndFeed feed = new SyndFeedImpl(); feed.setFeedType("atom_1.0"); feed.setTitle("Sample Feed (created with Rome)"); feed.setLink("http://rome.dev.java.net"); feed.setDescription("This feed has been created using Rome (Java syndication utilities"); feed.setEncoding("utf-8");//默认是utf-8 List entries = new ArrayList(); SyndEntry entry; SyndContent description; entry = new SyndEntryImpl(); // feed其中的一个 entry, 即其中一篇文章 entry.setTitle("Rome v1.0"); // 设置文章标题 entry.setLink("http://wiki.java.net/bin/view/Javawsxml/Rome01"); entry.setPublishedDate(new Date()); description = new SyndContentImpl(); // 文章的描述 description.setType("text/plain"); description.setValue("hello caohaigang"); entry.setDescription(description); entries.add(entry); entry = new SyndEntryImpl(); entry.setTitle("Rome v1.0"); entry.setLink("http://wiki.java.net/bin/view/Javawsxml/Rome01"); entry.setPublishedDate(new Date()); description = new SyndContentImpl(); description.setType("text/plain"); description.setValue("<img src=\"http://farm4.static.flickr.com/3026/2645744338_bf6a7e9c57_m.jpg\" />"); entry.setDescription(description); entries.add(entry); feed.setEntries(entries); // 设置feed的文章列表 String path = "c:/xml"; File f = new File(path); if(!f.exists()){ f.mkdirs(); } String fileName = dateParser.format(new Date())+".xml"; //FileWriter输出的XML文件为gb2312编码,这在linux下无法使用 //Writer writer = new FileWriter(path + "/" + fileName); //要和正文编码设置一致 Writer writer = new OutputStreamWriter(new FileOutputStream(fileName), "UTF-8"); SyndFeedOutput output = new SyndFeedOutput(); output.output(feed,writer); // 向客户端输出xml writer.close(); System.out.println("The feed has been written to the file ["+fileName+"]"); }}
import com.sun.syndication.feed.synd.SyndEntry;import com.sun.syndication.feed.synd.SyndFeed;import com.sun.syndication.fetcher.FeedFetcher;import com.sun.syndication.fetcher.impl.FeedFetcherCache;import com.sun.syndication.fetcher.impl.HashMapFeedInfoCache;import com.sun.syndication.fetcher.impl.HttpURLFeedFetcher;public class RssReader { public static void main(String[] args) throws Exception { FeedFetcherCache feedInfoCache = HashMapFeedInfoCache.getInstance(); FeedFetcher feedFetcher = new HttpURLFeedFetcher(feedInfoCache); URL url = new URL("http://www.china-pub.com/rss/FeedPub.asp?id=3"); //url是XML文件, 如http://feed.feedsky.com/xxx.xml SyndFeed feed = feedFetcher.retrieveFeed(url); List entryList = feed.getEntries(); for (int i = 0; i < entryList.size(); i++) { SyndEntry entry = (SyndEntry) entryList.get(i); System.out.println("Published Date: " + entry.getPublishedDate()); System.out.println("Title: " + entry.getTitle()); System.out.println("Link: " + entry.getLink()); SyndContent sc = entry.getDescription(); if(sc!=null){ System.out.println("Description: " + sc.getValue()); } System.out.println("------------------------------"); } }}
其中FeedType为以下同种中的一种
public static final String RSS_090 = "rss_0.9";public static final String RSS_092 = "rss_0.92";public static final String RSS_093 = "rss_0.93";public static final String RSS_094 = "rss_0.94";public static final String RSS_091_Netscape = "rss_0.91";public static final String RSS_091_Userland = "rss_0.91";public static final String RSS_100 = "rss_1.0";public static final String RSS_200 = "rss_2.0";public static final String ATOM_030 = "atom_0.3";public static final String ATOM_100 = "atom_1.0";
用ROME ,就可以很简单的生成rss, atom或者将rss转化成atom, 等操作..
这个插件需要3个jar包 jdom.jar rome-0.9.jar rome-fetcher-0.9.jar
2.通过rssutils插件可以对RssXml进行读操作，引入jar包之后直接可以通过在jsp页写标签进行输出，优点：使用简单。缺点：仅仅只能对RssXml文件进行读取操作。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib uri="/WEB-INF/rssutils.tld" prefix="rss" %><rss:feedurl="http://dev.csdn.net/rss/2.xml"feedId="example1"/><b>Image: </b><rss:channelImage feedId="example1" asLink="true"/><br><b>Title: </b><rss:channelTitle feedId="example1"/><br><b>Link: </b><rss:channelLink feedId="example1" asLink="true"/><br><b>Description: </b><rss:channelDescription feedId="example1"/><br><ul> <rss:forEachItem feedId="example1"> <li><rss:itemTitle feedId="example1"/><br> <rss:itemLink feedId="example1"/><br> <rss:itemDescription feedId="example1"/><br> </rss:forEachItem></ul>
需要rssutils.jar
相关资源：敏捷开发V1.0.pptx
