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Thread: Link Grabber

  1. #1
    Junior Member
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    Default Link Grabber

    I created this program which grabs all <img> links in a single html file. But I can't get it work.

    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package network;
     
    import java.io.FileReader;
    import java.io.IOException;
    import java.io.Reader;
    import java.util.ArrayList;
    import java.util.List;
    import javax.swing.text.MutableAttributeSet;
    import javax.swing.text.html.HTML.Attribute;
    import javax.swing.text.html.HTML.Tag;
    import javax.swing.text.html.HTMLEditorKit.ParserCallback;
    import javax.swing.text.html.parser.ParserDelegator;
     
    /**
     *
     * @author ztron
     */
    public class LinkGrabber {
        private LinkGrabber(){}
     
        public static List<String> extractLinks(Reader reader) throws IOException{
            final ArrayList<String> list = new ArrayList<String>();
     
            ParserDelegator parserDelegator = new ParserDelegator();
            ParserCallback parsercallback = new ParserCallback(){
                public void handleText(final char[] data, final int pos){}
                public void handleStartTag(Tag tag, MutableAttributeSet attribute, int pos){
                    if(tag == Tag.IMG){
                        String address = (String)attribute.getAttribute(Attribute.ALT);
                        list.add(address);
                    }
                }
                public void handleEndTag(Tag t, final int pos){}
                public void handleSimpleTag(Tag t, MutableAttributeSet a, final int pos){}
                public void handleComment(final char[] data, final int pos){}
                public void handleError(final java.lang.String errMsg, final int pos){}
     
                //public void handleError(final java.lang.String errMsg, final int pos){}
            };
     
            parserDelegator.parse(reader, parsercallback, true);
            return list;
        }
     
        public final static void main(String args[]) throws Exception{
     
            FileReader reader = new FileReader("java.html");
            List<String> links = LinkGrabber.extractLinks(reader);
            for(String link : links){
                System.out.println(link);
            }
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Link Grabber

    Can you explain a little more what your problem is?
    Do you get an error? Please post the full text of the error message.
    Is the output incorrect? Please show what you get and explain why it is wrong.

  3. #3
    mmm.. coffee JavaPF's Avatar
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    Default Re: Link Grabber

    Did you really write this yourself?

    As Norm says, what is the problem exactly? What happens when you compile the program?
    The more information you can give us the better. It will save us creating our own html file etc to test this..
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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