Question

我在下面有一个rss文件：

http://teamcity/app/rest/builds/?locator=property:(name:<name>,value:<value>),lookupLimit:1000

我想获得图片的网址我使用罗马图书馆，但没有找到任何解决方案如何在罗马图书馆的项目中获取图片的网址？

Answer 1

我为了获取图片标记，在以下内容上构建新的rss解析器：

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;
}

}

在类中覆盖parseItem方法并添加get image元素的代码并将图像的URL添加到Enclosures.

然后将以下行添加到 rome.properties 文件中：

WireFeedParser.classes = [packge name] .NewRssParser

示例：

WireFeedParser.classes = ir.armansoft.newscommunity.newsgathering.parser.impl.NewRssParser

Answer 2

罗马不会提供<image>代码，因为它不属于它所在的名称空间。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 ...

如果图片标记为in a different namespace，则为：

<image:image>http://www.saipanews.com/media/image/%D8%AA%D9%88%D9%84%D9%8A%D8%AF/2.jpg</image:image>

你可以用这种方式获得标记：

for(SyndEntry entry : feed.getEntries()) {
    for (Element element : entry.getForeignMarkup()) {
        System.out.println("element: " + element.toString());
    }
}

结果将是

element: [Element: <image:image [Namespace: http://purl.org/rss/1.0/modules/image/]/>]

除非Feed被修复，否则目前似乎无法通过Rome库获取图片网址。

Answer 3

我通过使用罗马解析Feed然后再次解析它来获取原始jdom文档解决了这个问题。然后我可以从Feed中获取项目元素并查找图像。有点hacky但比扩展RSS解析器等更容易。

Worksheets("Sheet1")

以下是获取jdom文档的类：

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 ...
    }
}

Answer 4

答案很简单。首先使用Roam API获取syndContent。找到阅读图像的代码和RSS中的所有内容

<%@ 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是Servlet类： -

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);

}
}

用罗马图书馆获取rss的图片网址

4 个答案: