Rome介绍 java的RSS阅读，发布器

Rome是为RSS聚合而开发的一个框架，让你可以快速的开发基于java的RSS阅读，发布器，支持

RSS 0.91 Netscape

RSS 0.91 Userland

RSS 0.92

RSS 0.93

RSS 0.94

RSS 1.0

RSS 2.0

Atom 0.3

Atom 1.0

等标准。你也可以自己扩展他的Module，让他解析你自己定义的XML格式。可以说它是一种用途很广的框架，在使用它之前。你必须下载JDOM开发包，因为它是用JDOM解析XML的。

在Rome中主要包裹下面几个包

com.sun.syndication.feed

com.sun.syndication.feed.atom

与获得atom中各个节点的数据

com.sun.syndication.feed.module

modeule为各个数据模型层。可以自己扩展

com.sun.syndication.feed.rss

用与获得RSS中各个相对应的XML节点中的值

com.sun.syndication.feed.sse
com.sun.syndication.feed.synd

此包为写成RSS格式的XML设置个节点的属性
com.sun.syndication.io

此包为输入输出流。

它的UML图



图1

下面是一个例子，功能是生成RSS格式的XML

public class FeedWriter {

private static final String DATE_FORMAT = "yyyy-MM-dd";

public static void main(String[] args) {
boolean ok = false;
if (args.length==2) {
try {
String feedType = args[0];
String fileName = args[1];

DateFormat dateParser = new SimpleDateFormat(DATE_FORMAT);

SyndFeed feed = new SyndFeedImpl(); //feed流
feed.setFeedType(feedType); //设置rss版本

feed.setTitle("Sample Feed (created with Rome)"); //<title>设置标题
feed.setLink(http://www.csdn.net); //<link>
feed.setDescription("This feed has been created using Rome (Java syndication utilities");

List entries = new ArrayList();
SyndEntry entry;
SyndContent description;

entry = new SyndEntryImpl(); //子节点
entry.setTitle("Rome v1.0");
entry.setLink(http://www.csdn.net);
entry.setPublishedDate(dateParser.parse("2004-06-08"));
description = new SyndContentImpl();
description.setType("text/plain");
description.setValue("Initial release of Rome");
entry.setDescription(description);
entries.add(entry);

entry = new SyndEntryImpl();
entry.setTitle("Rome v2.0");
entry.setLink(http://ww.csdn.net);
entry.setPublishedDate(dateParser.parse("2004-06-16"));
description = new SyndContentImpl(); //描述
description.setType("text/xml");
description.setValue("Bug fixes, <xml>XML</xml> minor API changes and some new features");
entry.setDescription(description);
entries.add(entry);

entry = new SyndEntryImpl();
entry.setTitle("Rome v3.0");
entry.setLink("http://www.csdn.net");
entry.setPublishedDate(dateParser.parse("2004-07-27"));
description = new SyndContentImpl();
description.setType("text/html");
description.setValue("<p>More Bug fixes, mor API changes, some new features and some Unit testing</p>"+
"<p>For details check the <a href=/"http://www.csdn.net/">Changes Log</a></p>");
entry.setDescription(description);
entries.add(entry);

feed.setEntries(entries); //设置子节点

Writer writer = new FileWriter(fileName);
SyndFeedOutput output = new SyndFeedOutput();
output.output(feed,writer); //写到文件中去

writer.close();

System.out.println("The feed has been written to the file ["+fileName+"]");

ok = true;
}
catch (Exception ex) {
ex.printStackTrace();
System.out.println("ERROR: "+ex.getMessage());
}
}

if (!ok) {
System.out.println();
System.out.println("FeedWriter creates a RSS/Atom feed and writes it to a file.");
System.out.println("The first parameter must be the syndication format for the feed");
System.out.println(" (rss_0.90, rss_0.91, rss_0.92, rss_0.93, rss_0.94, rss_1.0 rss_2.0 or atom_0.3)");
System.out.println("The second parameter must be the file name for the feed");
System.out.println();
}
}

}