How to parse HTML page

What API or package can I use to parse an HTML page and to obtain
HTML DOM interfaces.

Use JTidy to make the HTML well-formed, then use the DOM parser in the Xerces API:
JTidy (recommended by W3C, so its probably pretty good):
http://www.w3.org/People/Raggett/tidy/
http://sourceforge.net/projects/jtidy

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