WEB中使用ROME实现RSS服务

首页
http://wiki.java.net/bin/view/Javawsxml/Rome05TutorialFeedServlet

文件
rome-1.0RC1.jar

1、配置RSS服务
其实挺简单，没啥好配置的，我是配置在我的spring mvc controller中使用的
先在pom.xml中导入这个东东，先导入到maven2私服，然后修改pom.xml
<dependency>
<groupId>rome</groupId>
<artifactId>rome</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>jdom</groupId>
<artifactId>jdom</artifactId>
<version>1.0</version>
</dependency>

嘿嘿，修改springside上的BaseManageController基类（我用的springside2上的基类，感觉还挺清晰的）
增加了如下方法
/**
* RSS支持
* @param request
* @param response
* @return
* @throws Exception
*/
public ModelAndView rss(HttpServletRequest request,
HttpServletResponse response) throws Exception {
onRss(request, response);
return null;
}

//等着被overwrite
protected void onRss(HttpServletRequest request,
HttpServletResponse response) throws Exception {
}

在基类BaseController中加入如下代码：
private static final String MIME_TYPE = "application/xml; charset=UTF-8";

// rss_0.90, rss_0.91, rss_0.92, rss_0.93, rss_0.94, rss_1.0, rss_2.0,
// atom_0.3
private static final String RSS_TYPE = "rss_2.0";

//我直接写死的rss_2.0，其实也没有啥好配置的
/**
* 直接向客户端返回，不用通过View页面渲染.
*/
protected void rendText(HttpServletResponse response, SyndFeed feed)
throws IOException {
response.setCharacterEncoding("UTF-8");
feed.setFeedType(RSS_TYPE);
response.setContentType(MIME_TYPE);
SyndFeedOutput output = new SyndFeedOutput();
try {
output.output(feed, response.getWriter());
} catch (IOException e) {
e.printStackTrace();
} catch (FeedException e) {
e.printStackTrace();
}
}

找了个UserContoller.java来演示一下，当然实际中，应该是从manager层得到数据吧，这里我是MOCK一些数据来DEMO的
protected void onRss(HttpServletRequest request,
HttpServletResponse response) throws Exception {

SyndFeed feed = new SyndFeedImpl();
feed.setTitle("Channel title");
feed.setLink("http://hi.baidu.com/luohuazju");
feed.setDescription("Channel title, java demo");

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

entry = new SyndEntryImpl();
entry.setTitle("RSS demo");
entry.setLink("http://hi.baidu.com/luohuazju");
entry.setPublishedDate(new Date());

description = new SyndContentImpl();
description.setType("text/plain");
description.setValue("just the guide in the rome site");
entry.setDescription(description);
entries.add(entry);

feed.setEntries(entries);

rendText(response, feed);
}

服务配置就结束了，弄个reader来读取下看。

2、reader读取RSS
核心代码如下：
URL feedUrl = null;
try {
feedUrl = new URL("http://www.kiko.com/search/user.do?method=rss");
} catch (MalformedURLException e) {
e.printStackTrace();
}
SyndFeedInput input = new SyndFeedInput();
try {
SyndFeed feed = input.build(new XmlReader(feedUrl));
System.out.println(feed.getTitle());
List list = feed.getEntries();
for (int i = 0; i < list.size(); i++) {
SyndEntry entry = (SyndEntry) list.get(i);
System.out.println(entry.getTitle() + " : "
+ entry.getPublishedDate());
System.out.println(entry.getLink());
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (FeedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

就上面的server和reader的列子，读出的结果是：
Channel title