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Parsing an HTML doc  RSS feed

 
Bill Compton
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I'm working on a project that requires parsing an HTML stream. Rather than write the parser myself, it seemed promising to use the HTML / HTMLDocument classes. I expected to write something roughly like:
HTMLDocument h = new HTMLDocument("http://page.domain.com");
or maybe ...= new HTMLDocument( aStreamReader );
Followed by a (possibly recursive) set of calls like:
Element elem = h.getNextElement();
However, I can find nothing like this (or any other approach) among the Java doc'n. Can anyone offer a suggestion or (even better!) a code snippet?
 
Carl Trusiak
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Check out the javax.swing.text.html package Here, It might just be what you need.
Hope this helps
 
Bill Compton
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Thanks, Carl! The article is a goldmine. Here's the distilled code. I plagiarized the getConnection method from some Paul Wheaton code.

[This message has been edited by Bill Compton (edited November 30, 2000).]
 
Jarvis Ka
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Given the sample code above, could anyone tell me how can I be able to search the "data"? For example, if I want to find out whether a web page contain the word "JavaBean"?
Could anybody help me out? Or point me to a right direction?
Thank you!
Jarvis
[ January 03, 2002: Message edited by: Jarvis Ka ]
 
Bill Compton
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Sure - the type of the variable 'data' is char[], which can be used to instantiate a String:
String s = new String( data );
Then the String methods like indexOf() can easily be used to find particular words you care about. In my case, I built a simple parser to break the input stream into tokens that could be "understood". The parser received String types created in this way.
 
Joshua
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I tried running that code on diferent websites (www.cnn.com & www.nytimes.com) and I'm getting an error. Any ideas?
Exception in thread "main" javax.swing.text.ChangedCharSetException
at javax.swing.text.html.parser.DocumentParser.handleEmptyTag(DocumentPa
rser.java:169)
at javax.swing.text.html.parser.Parser.startTag(Parser.java:372)
at javax.swing.text.html.parser.Parser.parseTag(Parser.java:1846)
at javax.swing.text.html.parser.Parser.parseContent(Parser.java:1881)
at javax.swing.text.html.parser.Parser.parse(Parser.java:2047)
at javax.swing.text.html.parser.DocumentParser.parse(DocumentParser.java
:106)
at javax.swing.text.html.parser.ParserDelegator.parse(ParserDelegator.ja
va:78)
at ParseURL.main(ParseURL.java:31)
 
Sudharsan Govindarajan
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Hi!
Is this code not working for you even for a single site or it does not work for some specific sites?
 
Tomer Libal
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Try setting ignoreCharSet to true in the ParserDelegator.
The problem for me is when using the HTMLEditor, i have no place to set this flag to true.
does anybody know of any html parser that returns a document with elements including all attributes including css (outer and inner).
thanks
Tomer
 
Stan James
(instanceof Sidekick)
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You've already done the hard work, so this comes a bit late. I use the Quiotix HTML Parser that parses into a DOM. The DOM supports the visitor pattern that could be used to check the text of each node or do lots of other cool stuff.
 
It is sorta covered in the JavaRanch Style Guide.
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