The following article explains how to use the Attributes and Styles in a DefaultStyledDocument which happens to be the document for JEditorPane by default.

http://java.sun.com/products/jfc/tsc/articles/text/attributes/

Basically you have to set the attibutes for a run of text using -

SimpleAttributeSet sas = new SimpleAttributeSet();
StyleConstants.setForeground((Color)foregroundColorTable.get(toke.kind));
StyleConstants.setBackground((Color)backgroundColorTable.get(toke.kind));
    textPane.getStyledDocument().setCharacterAttributes
                 (token.offset, token.length, sas, true);

I would simplify it by catagorizing the tokens into say -

• 
  KEYWORD
  
• 
  TYPE
  
• 
  IDENTIFIER
  
• 
  STRING
  
• 
  NUMBER
  
• 
  FORMAL_COMMENT
  
• 
  COMMENT
  

instead of using token.kind.

In fact you can define styles using
javax.swing.text.Style per category.