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OPML and RSS from YouTube, a parse question

Greenhorn

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posted 7 years ago

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Hello all, first post and new to Java

Ive been looking for a Java home for a while, I've been using StackOverflow for a while and yes its a great reference however if you get stuck it can take days to get any response,. So not really what Im looking for,

I have a question, which I posted on SO but its still there waiting for a response so Im going to try it here

----------------------------------------------Informa RSS - Class missing error, what am I doing wrong?---------------------------------------------

I've set out some code for reading an OPML file for subscriptions from YouTube. The code comes from Informa RSS here http://informa.sourceforge.net/quickstart.html

When I run the code I get class missing error. The only reference to this I could find suggested the javaDOM version might be wrong since it was updated to DOM2.0 but failed to tell me how I could fix, it just said to use an older one and gave a link to a javaDOM version 0.7?

Now when I installed the JavaDOM 0.7 into the Library for Netbeans the error disappears until I try to run or compile it and it fails....

Now I dont know where to go with it.

I've been struggling with this for a few days now, my main problem is the OPML file has all the same tag information, ie

..and there isn't enough information about how to handle this combination of tags in Java, Ive been searching for three days...

Knute Snortum

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posted 7 years ago

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At a minimum, we need to see the full text of the error messages. If your program isn't too long, you can post the code here and UseCodeTags (that's a link). If the program is too long or it replies on a lot of other classes, post a SSCCE (that's a link).

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Phil Cee

Greenhorn

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posted 7 years ago

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I've nearly given up on this because generally there is no responses to any RSS queries. That coupled with the fact I couldn't find a live projects of Libraries led me to believe that maybe RSS is a dead duck these days?
I don't know!

My current effort has floundered and is as follows.

As I said I am new to this but I do have some background in the field, I found a Library that sounds great called Rome

The Library was one for Mavern (which I hadn't used before) and some sample code to get it to work.

/*
 * Copyright (c) 2006 Mark Woodman
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.philsscriping.mavernvideoplayer;

import com.rometools.rome.feed.synd.*;
import com.rometools.rome.io.*;
import com.totsp.xml.syndication.content.ContentModule;
import java.io.*;
import java.net.URL;
import java.util.*;

/**
 * FeedWarmer demonstrates how to use ROME to read, manipulate
 * and publish an RSS or Atom feed.   This example adds a footer
 * of "immediate action" links to each feed item.
 *
 * @author Mark Woodman
 *
 */
public class FeedWarmer
{
    /** Namespace URI for content:encoded elements */
    private static String CONTENT_NS =
            "http://purl.org/rss/1.0/modules/content/";

/** Parses RSS or Atom to instantiate a SyndFeed. */
    private SyndFeedInput input;

/** Transforms SyndFeed to RSS or Atom XML. */
    private SyndFeedOutput output;

/**
     * Default constructor.
     */
    public FeedWarmer()
    {
        input = new SyndFeedInput();
        output = new SyndFeedOutput();
    }

/**
     * Add FeedWarmer footer to all items of any feed,
     * then republish as format specified in OUTPUT.
     * @param url           The feed URL to input
     * @param outFormat     The feed type to output.  Can be:
     *                      rss_0.9, rss_0.91, rss_0.92, rss_0.93,
     *                      rss_0.94, rss_1.0, rss_2.0, atom_0.3,
     *                      or atom_1.0
     * @throws IOException
     * @throws FeedException
     */
    public String warmFeed(URL url, String outFormat)
            throws IOException, FeedException
    {
        // Load the feed, regardless of RSS or Atom type
        SyndFeed feed = input.build(new XmlReader(url));

// Set the output format of the feed
        feed.setFeedType(outFormat);

// Modify the feed title
        String newTitle = feed.getTitle() + " (Warmed)";
        feed.setTitle(newTitle);

// Iterate through feed items, adding a footer each item
        Iterator entryIter = feed.getEntries().iterator();
        while (entryIter.hasNext())
        {
            SyndEntry entry = (SyndEntry) entryIter.next();
            addFooter(entry);
        }

// Generate XML in output format, regardless of original
        StringWriter writer = new StringWriter();
        output.output(feed, writer);
        return writer.toString();
    }

/**
     * Add FeedWarmer footer to an entry.
     * @param entry
     */
    private void addFooter(SyndEntry entry)
    {
        // Prep variables used in loops
        String title = entry.getTitle();
        String link = entry.getLink();

// Use the add-on ContentModule to handle
        // <content:encoded/> elments within the feed
        ContentModule module =
                ((ContentModule) entry.getModule(CONTENT_NS));

// If content:encoded is found, use that.
        if(module!=null)
        {
            // Container for footer-appended HTML strings
            List newStringList = new ArrayList();

// Iterate through encoded HTML, creating footers
            Iterator oldStringIter =
                    module.getEncodeds().iterator();
            while (oldStringIter.hasNext())
            {
                String original = (String) oldStringIter.next();
                newStringList.add(createFooter(original,
                                  link, title));
            }

// Set new encoded HTML strings on entry
            module.setEncodeds(newStringList);
        }
        else
        {
            // Fall back to adding footer in <description/>
            // This results in escaped HTML.  Ugly, but common.
            Iterator contentIter = entry.getContents().iterator();
            while (contentIter.hasNext())
            {
                // Target the description node
                SyndContent content =
                        (SyndContent) contentIter.next();

// Create and set a footer-appended description
                String original = content.getValue();
                content.setValue(createFooter(original,
                                 link, title));
            }
        }
    }

/**
     * Create a feed item footer of immediate actions
     * by using information from the feed item itself
     * @param original  The original text of the feed item
     * @param link      The link for the feed item
     * @param title     The title of the feed item
     * @return
     */
    private String createFooter(String original, String link,
                                String title)
    {
        // Use StringBuffer to create a sb
        StringBuffer sb = new StringBuffer(original);
        sb.append("\n\n<div class='feedwarmer'><hr/>");
        sb.append("<i>Getting Warmer:</i> ");

// Add email link using title and item link
        sb.append("<a href='mailto:?body=Check this out: ");
        sb.append(link).append("'>Email this</a> | ");

// Add delicious link using item title link
        sb.append("<a href='http://del.icio.us/post/?url=");
        sb.append(link).append("&title=").append(title);
        sb.append("'>Add to delicious</a> | ");

// Add Google Blogs Search link using item title
        sb.append("<a href='http://blogsearch.google.com/");
        sb.append("blogsearch?hl=en&q=").append(title);
        sb.append("'>Blog Search this</a>");

// Finish and return the sb
        sb.append("</div>\n");
        return sb.toString();
    }

/**
     * Main method to demo from command line.
     * @param args        args[0] must be the URL of a feed
     * @throws Exception
     */
    public static void main(String[] args) throws Exception
    {
        // Create instance
        FeedWarmer warmer = new FeedWarmer();

// "Warm" a feed using URL passed in,
        // designating the feed output desired
        String warmedFeed = warmer.warmFeed(new URL(args[0]),
                                            "rss_2.0");
        // Print to console to demo results
        System.out.println(warmedFeed);
    }

}

I've added the Rome to the project which it seemed to accept and load dependences ok, then it spewed out an error related to the JDOM required was missing. I found a post suggesting that the Rome Library needed the older JDOM 1.0 version, and suggested loading in the JDOM 1.0 and JDOM 2.0 into the project - so my window looks like this now.

but now I get another error and Im stuck again!

It a bit strange coming from coding years ago and coming back to it. I know exactly what I want to do but get tripped up because of lack of current ways to do things.
I guess it comes with practice.

Any help here would be appreciated - I had almost given up, I was going to go and write a bespoke version - but I wanted to understand it from the ground up. To do tht I need a working piece of software to backward logic it all out, thing is I cannot even get that far....sigh

Phil

Phil Cee

Greenhorn

Posts: 6

posted 7 years ago

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Sorry forgot this bit,

The code above was not wrote by me, its a script provided that should work if you have done everything correct, I think it downloads a feed from Stack Overflow. I was going to use this to think through how it all works but as I cannot get it to work I cannot proceed.

The reason I chose Rome was because its supposed to decide which 'flavour' of RSS it is and decode accordingly.

The output from someone downloading their Subscriptions RSS is an OPML file that contains the subscriber and link to their RSS.

IGNORE THE Home.java file, that is not part of the problem.

Knute Snortum

Sheriff

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posted 7 years ago

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Well, the error you posted is a Maven (mvn) error. How are you executing you Java code? From an IDE? From the command line?

All things are lawful, but not all things are profitable.

Don't get me started about those stupid light bulbs.