can not find symbol class Head

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  • Merin Lalu
    New Member
    • Oct 2011
    • 20
    #1

    can not find symbol class Head

    Can any one help me?

    I got a code for the parse method of Parser class in html parser library from the link

    htmlparser.sour ceforge.net/javadoc/index.html

    the code is as follows

    Code:
    NodeList nl = parser.parse (null); // here is your two node list
 NodeList heads = nl.extractAllNodesThatMatch (new TagNameFilter ("HEAD"))
 if (heads.size () > 0) // there may not be a HEAD tag
 {
     Head head = heads.elementAt (0); // there should be only one
     head.removeAll (); // clean out the contents
     Tag title = new TitleTag ();
     title.setTagName ("title");
     title.setChildren (new NodeList (new TextNode ("The New Title")));
     Tag title_end = new TitleTag ();
     title_end.setTagName ("/title");
     title.setEndTag (title_end);
     head.add (title);
 }
 System.out.println (nl.toHtml ()); // output the modified HTML
    but when i am running this code, i am getting an error

    "cannot find symbol class Head"

    i couldnt find a class named Head in the library..

    what should i do??
    Tags: None
    • r035198x
      MVP
      • Sep 2006
      • 13225
      #2
      I think it was a typing mistake in the code.
      I suspect the line should have been
      Code:
      Tag head = heads.elementAt (0); // there should be only one
      instead of
      Code:
      Head head = heads.elementAt (0); // there should be only one

        Comment

        • Merin Lalu
          New Member
          • Oct 2011
          • 20
          #3
          But the Tag class does not have a method named removeAll(). so again error

          can not find symbol method removeAll()

            Comment

            • r035198x
              MVP
              • Sep 2006
              • 13225
              #4
              I thought it could be a HeadTag but that doesn't seem to contain a removeAll method either.
              Find out what type it is with
              Code:
               System.out.println(heads.elementAt (0));
//comment out the rest of the code

                Comment

                • Merin Lalu
                  New Member
                  • Oct 2011
                  • 20
                  #5
                  the nodelist heads is null.. so heads.elementAt (0) is null

                  but input htmlpage has an headtag in it. i dont know why it is printing null

                    Comment

                    • r035198x
                      MVP
                      • Sep 2006
                      • 13225
                      #6
                      But there is an
                      Code:
                      if (heads.size () > 0) // there may not be a HEAD tag
 {
                      If your code is going into that if then a HEAD tag is there.
                      Create a short version of the program and post the code and the html you are using.

                        Comment

                        • Merin Lalu
                          New Member
                          • Oct 2011
                          • 20
                          #7
                          actually i commented
                          Code:
                          if (heads.size () > 0){
}
                          I am submitting the code and HTML code

                          Code:
                           import org.htmlparser.Parser;
 import org.htmlparser.Tag;
 import org.htmlparser.Text;
 import org.htmlparser.util.ParserException;
 import org.htmlparser.visitors.NodeVisitor;
 import java.util.*;
import org.htmlparser.filters.TagNameFilter;
import org.htmlparser.nodes.TextNode;
import org.htmlparser.NodeFilter;
import org.htmlparser.util.NodeList;


 public class MyVisitor1 extends NodeVisitor
 {
     
String str="DOCUMENT/HTML"; 
static Hashtable pages = new Hashtable();
int i=1;
static Enumeration names; 

static String str1=null;

     public MyVisitor1 ()
     {
     
     }
     public void visitTag (Tag tag)
     {
       //  System.out.println ("\n" + tag.getTagName ());

         str=str+"/"+tag.getTagName();

         pages.put("p"+i,str);
         i=i+1;
       
     //    System.out.println ("\n" +str);
     }
     public void visitStringNode (Text string)
     {

	String st=string.getText();

	if(!st.trim().equals(""))
	{
	
	str=str+"/"+string.getText();
 	pages.put("p"+i,str); 
	i=i+1; 


	}
     }

     public static void display()
    {

	names = pages.keys();
	
	while(names.hasMoreElements()) 
	{
	str1 = (String) names.nextElement();
	System.out.println("...................................................................\n");
	System.out.println(str1+ ": " +pages.get(str1));
	} 
System.out.println("the size of hash table is ::"+pages.size());
    }

     public void visitEndTag(Tag tag)
    {
	String starttag=tag.getTagName();
	int n=str.lastIndexOf(starttag);
	//System.out.println("last index is::"+n);

	if(n<0)
	{
		return;
	}	
	str= str.substring(0,n-1);
	//System.out.println("substring is::"+str);
		  
      }

     public static void main (String[] args) throws ParserException
     {
        
      	Parser parser = new Parser ("E:/project/docs/d6.html");
	
	NodeList nl = parser.parse (null); // here is your two node list
	 NodeList heads = nl.extractAllNodesThatMatch (new TagNameFilter ("head"));

 	//if (heads.size () > 0) // there may not be a HEAD tag
 	//{
	System.out.println("hello"+heads.elementAt (0));
  	   //Tag head =(Tag)heads.elementAt (0); // there should be only one
   	 //head.removeAll (); // clean out the contents

	//}

         MyVisitor1 visitor = new MyVisitor1 ();

         nl.visitAllNodesWith (visitor);
	//display();
     }
 }
                          here is the html inout

                          Code:
                          <html>
<head>
<title> hai</title>
</head>
<body>
<h1>tech</h1>
<br />
</body>
</html>

                            Comment

                            • r035198x
                              MVP
                              • Sep 2006
                              • 13225
                              #8
                              Use
                              Code:
                              NodeList heads = nl.extractAllNodesThatMatch(new TagNameFilter("HEAD"), true);
Tag head =(Tag)heads.elementAt (0); // there should be only one
System.out.println(head);
                              You'd have to check the Javadocs to see what that true flag does.

                                Comment

                                • Merin Lalu
                                  New Member
                                  • Oct 2011
                                  • 20
                                  #9
                                  Thanks a lot.. I got it..

                                    Comment

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