so what I'm trying to do is pretty simple. I'm parsing an HTML document for script tags, using the ParserDelegator, and using a ParserCallback to spit out the script tags. But when I run this program, it does nothing. The callbacks are never called. My html file path is correct and it does contain script tags. It's formatted correctly too.
import java.io.*;
import javax.swing.text.html.parser.ParserDelegator;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.text.html.HTML;
import javax.swing.text.SimpleAttributeSet;
import java.util.Enumeration;
public class JSFinder {
//static ParserDelegator pd;
public JSFinder () {
//pd = new ParserDelegator();
}
public static void main(String args[]) {
try {
HTMLEditorKit.ParserCallback callback = new ScriptTagCallBack();
new ParserDelegator().parse(new InputStreamReader(new FileInputStream(new File ("<path-to-html>"))), callback, false);
}
catch (Exception e) {
e.printStackTrace();
}
}
}
class ScriptTagCallBack extends HTMLEditorKit.ParserCallback {
public ScriptTagCallBack() {
super();
}
public void handleStartTag(HTML.Tag t, SimpleAttributeSet a, int pos) {
if(t == HTML.Tag.SCRIPT) {
System.out.println("Found a script tag");
System.out.println(a);
}
else {
System.out.println("Not a script tag");
}
}
public void handleEndTag(HTML.Tag t, SimpleAttributeSet a, int pos) {
if(t == HTML.Tag.SCRIPT) {
System.out.println("Found a script tag");
System.out.println(a);
}
else {
System.out.println("Not a script tag");
}
}
}
Any idea what I'm doing wrong? I've looked at examples (like this one: http://www.java2s.com/Tutorial/Java/0320__Network/HTMLparserbasedonHTMLEditorKitParserCallback.htm) and I'm doing basically the same thing (except maybe that I 开发者_StackOverflow社区haven't overridden all the methods of ParserCallback and I'm using a file path instead of a URL). Thanks in advance.
Use the @Override
annotation to see that you are hiding rather than overriding methods of HTMLEditorKit.ParserCallback
. Fix the signatures, and it works.
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