问题
I having a rss file in following :
<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
<channel>
<title> سایپا نیوز </title>
<link>http://www.saipanews.com/</link>
<description></description>
<language>fa</language>
<item>
<author></author>
<pretitle></pretitle>
<title>پیام تبریک دکتر جمالی به مناسبت فرارسیدن سالروز ولادت حضرت علی(ع) و روز پدر</title>
<link>http://www.saipanews.com/view-6751.html</link>
<pubdate>2016-04-20 10:58:00</pubdate>
<description>سایپا نیوز: مدیرعامل گروه خودروسازی سایپا همزمان با فرارسیدن سالروز میلاد باسعادت حضرت علی(ع) و روز پدر، طی پیامی به تمامی پدران متعهد و پرتلاش ایران زمین تبریک گفت.</description>
<secid>0</secid>
<typid>8</typid>
<image>http://www.saipanews.com/media/image/jamali/jmali.JPG</image>
</item>
<item>
<author></author>
<pretitle></pretitle>
<title>فرهنگ رانندگی بین خطوط در معابر شهری در حال گسترش است </title>
<link>http://www.saipanews.com/view-6748.html</link>
<pubdate>2016-04-19 11:27:00</pubdate>
<description>سایپا نیوز: به گزارش سایپا نیوز و به نقل از فرارو، از آنجایی که فرهنگ رانندگی مجموعه ای از رفتارهای درست رانندگی و آداب زندگی اجتماعی بهنگام تردد در شهرها و جاده ها است، رانندگی در بین خطوط معابر شهری یکی از نمادهای فرهنگ رانندگی در کشورهای درحال توسعه و توسعه یافته می باشد.</description>
<secid>0</secid>
<typid>8</typid>
<image>http://www.saipanews.com/media/image/farhang%20ranandegi/252887_331.jpg</image>
</item>
</channel>
</rss>
I want to get image's urls.
I use Rome library but not found any solution.
how to get image's url in item with Rome library ?
回答1:
I for that get image tag , build new rss parser on the following:
public class NewRssParser extends RSS094Parser implements WireFeedParser {
public NewRssParser() {
this("rss_2.0");
}
protected NewRssParser(String type) {
super(type);
}
protected String getRSSVersion() {
return "2.0";
}
protected boolean isHourFormat24(Element rssRoot) {
return false;
}
protected Description parseItemDescription(Element rssRoot, Element eDesc) {
Description desc = super.parseItemDescription(rssRoot, eDesc);
desc.setType("text/html"); // change as per
// https://rome.dev.java.net/issues/show_bug.cgi?id=26
return desc;
}
public boolean isMyType(Document document) {
boolean ok;
Element rssRoot = document.getRootElement();
ok = rssRoot.getName().equals("rss");
if (ok) {
ok = false;
Attribute version = rssRoot.getAttribute("version");
if (version != null) {
// At this point, as far ROME is concerned RSS 2.0, 2.00 and
// 2.0.X are all the same, so let's use startsWith for leniency.
ok = version.getValue().startsWith(getRSSVersion());
}
}
return ok;
}
@Override
public Item parseItem(Element arg0, Element arg1) {
Item item = super.parseItem(arg0, arg1);
Element imageElement = arg1.getChild("image", getRSSNamespace());
if (imageElement != null) {
String imageUrl = imageElement.getText();
Element urlElement = imageElement.getChild("url");
imageUrl = urlElement != null ? urlElement.getText() : imageUrl;
Enclosure enc = new Enclosure();
enc.setType("image");
enc.setUrl(imageUrl);
item.getEnclosures().add(enc);
}
return item;
}
}
in the class override parseItem method and add code for get image element and add image's url to Enclosures.
then add following line to rome.properties file :
WireFeedParser.classes=[packge name].NewRssParser
Example :
WireFeedParser.classes=ir.armansoft.newscommunity.newsgathering.parser.impl.NewRssParser
回答2:
Rome wont provide the <image> tag because it does not belong to the namespace it is in. So the feed isn't valid:
line 18, column 3: Undefined item element: image (29 occurrences) [help]
<image>http://www.saipanews.com/media/image/%D8%AA%D9%88%D9%84%D9%8A%D8%A ...
If the image tag would be in a different namespace, like this:
<image:image>http://www.saipanews.com/media/image/%D8%AA%D9%88%D9%84%D9%8A%D8%AF/2.jpg</image:image>
You could get foreing markup in this way:
for(SyndEntry entry : feed.getEntries()) {
for (Element element : entry.getForeignMarkup()) {
System.out.println("element: " + element.toString());
}
}
And the result would be
element: [Element: <image:image [Namespace: http://purl.org/rss/1.0/modules/image/]/>]
Unless the feed is fixed, It seems that there isn't a way to get the image url with Rome library at the moment.
回答3:
I solved this problem by parsing the feed with Rome and then parsing it again to get the raw jdom Document. Then I can get the item elements from the feed and look for images. Bit hacky but it easier than extending the RSS parsers and so on.
byte[] data = ... bytes for the feed ...
SyndFeedInput input = new SyndFeedInput()
input.allowDoctypes = true
SyndFeed sf = input.build(new XmlReader(new ByteArrayInputStream(data)))
Document doc = new MyWireFeedInput().getDocument(new XmlReader(new ByteArrayInputStream(data)))
Element channel = doc.rootElement.getChild("channel")
List<Element> items = channel ? channel.getChildren("item") : null
List<SyndEntry> entries = sf.entries
for (int i = 0; i < entries.size(); i++) {
SyndEntry entry = entries[i]
Element item = items ? items[i] : null
if (item) {
Element image = item.getChild("image")
... add it to enclosures or whatever ...
}
}
Here is the class that gets the jdom Document:
/**
* This is a hack to get at the protected {@link WireFeedInput#createSAXBuilder()} method so we can get the
* raw jdom document for the feed to extract elements (e.g. 'image') not parsed by the built in feed parsers.
*/
public class MyWireFeedInput extends WireFeedInput {
Document getDocument(Reader reader) {
final SAXBuilder saxBuilder = createSAXBuilder();
try {
if (xmlHealerOn) reader = new XmlFixerReader(reader)
return saxBuilder.build(reader);
} catch (final JDOMParseException ex) {
throw new ParsingFeedException("Invalid XML: " + ex.getMessage(), ex);
} catch (final IllegalArgumentException ex) {
throw ex;
} catch (final Exception ex) {
throw new ParsingFeedException("Invalid XML", ex);
}
}
}
回答4:
The Answer is so simple. First get the syndContent using the Roam API. Find the code for the reading images and all content from RSS
<%@ page import="com.rometools.rome.feed.synd.SyndFeed"%>
<%@ page import="com.rometools.rome.feed.synd.SyndEntry"%>
<%@ page import="com.rometools.rome.feed.synd.SyndContent"%>
<%@ page import="com.rometools.modules.mediarss.MediaEntryModule"%>
<%@ page import="com.rometools.rome.feed.module.Module"%>
<%@ page import="com.rometools.modules.mediarss.types.Thumbnail"%>
<%@ page import="java.util.Iterator"%>
<%@ page import="java.util.List"%>
<html>
<head>
<title>website</title>
<link href="/css/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<h1>Home</h1>
<%
HttpSession session1=request.getSession(false);
SyndFeed syndFeed11= (SyndFeed) session1.getAttribute("syndFeed");
%>
<h2><%=syndFeed11.getTitle()%></h2>
<ul>
<%
Iterator it = syndFeed11.getEntries().iterator();
while (it.hasNext())
{
SyndEntry entry = (SyndEntry) it.next();
%>
<li><a href="<%=entry.getLink()%>"><%=entry.getTitle()%></a> <%
List<SyndContent> syndContents=entry.getContents();
System.out.println(syndContents.size());
for(SyndContent syndContent:syndContents)
{
System.out.println(syndContent.getMode());
System.out.println("This is content"+syndContent.getValue());
%>
//This is The STRING WHICH CONTAINS the link to the image apply regex expression to get SAMPLE_LINK out of "<img src"LINK">"
<%=syndContent.getValue() %>>
<%
}
//SyndContent syndContent=syndContents.get(0);
for (Module module : entry.getModules()) {
if (module instanceof MediaEntryModule) {
MediaEntryModule media = (MediaEntryModule)module;
for (Thumbnail thumb : media.getMetadata().getThumbnail()) {
%><img src="<%=thumb.getUrl() %>" />
<%
}
}
}
%></li>
<% } %>
</ul>
</body>
</html>
Bellow is the Servlet Class:-
package website.web;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.log4j.Logger;
import com.rometools.rome.feed.synd.SyndFeed;
import com.rometools.rome.io.FeedException;
import com.rometools.rome.io.SyndFeedInput;
import com.rometools.rome.io.XmlReader;
public class HomeServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private Logger logger = Logger.getLogger(this.getClass());
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String rssUrl=(String)req.getAttribute("rss");
logger.debug("Retrieving yahoo news feed");
URL url = new URL("https://www.reddit.com/.rss");
SyndFeedInput syndFeedInput = new SyndFeedInput();
HttpSession session=req.getSession();
SyndFeed syndFeed = null;
XmlReader xmlReader = new XmlReader(url);
try {
syndFeed = syndFeedInput.build(xmlReader);
System.out.println("Donr");
} catch (IllegalArgumentException e) {
logger.error("", e);
} catch (FeedException e) {
logger.error("", e);
}
logger.debug("Forwarding to home.jsp");
req.setAttribute("syndFeed11", syndFeed);
PrintWriter out = resp.getWriter();
out.println("<h1>");
out.println();
session.setAttribute("syndFeed", syndFeed);
out.println("</h1>");
ServletContext context = getServletContext();
RequestDispatcher dispatcher = context.getRequestDispatcher("/WEB-INF/jsp/home.jsp");
dispatcher.forward(req,resp);
}
}
来源：https://stackoverflow.com/questions/36743200/get-image-url-of-rss-with-rome-library