Java by API/javax.swing.text/AbstractDocument

AbstractDocument: getText(int offset, int length)

   <source lang="java">

import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; import javax.swing.text.AttributeSet; import javax.swing.text.Element; import javax.swing.text.ElementIterator; import javax.swing.text.StyleConstants; import javax.swing.text.html.HTML; import javax.swing.text.html.HTMLDocument; import javax.swing.text.html.HTMLEditorKit; import javax.swing.text.html.parser.ParserDelegator; public class MainClass {

 public static void main(String args[]) throws Exception {
   URL url = new URL("http://www.jexp.ru");
   URLConnection connection = url.openConnection();
   InputStream is = connection.getInputStream();
   InputStreamReader isr = new InputStreamReader(is);
   BufferedReader br = new BufferedReader(isr);
   HTMLEditorKit htmlKit = new HTMLEditorKit();
   HTMLDocument htmlDoc = (HTMLDocument) htmlKit.createDefaultDocument();
   HTMLEditorKit.Parser parser = new ParserDelegator();
   HTMLEditorKit.ParserCallback callback = htmlDoc.getReader(0);
   parser.parse(br, callback, true);
   ElementIterator iterator = new ElementIterator(htmlDoc);
   Element element;
   while ((element = iterator.next()) != null) {
     AttributeSet attributes = element.getAttributes();
     Object name = attributes.getAttribute(StyleConstants.NameAttribute);
     if ((name instanceof HTML.Tag) && (name == HTML.Tag.H1)) {
       StringBuffer text = new StringBuffer();
       int count = element.getElementCount();
       for (int i = 0; i < count; i++) {
         Element child = element.getElement(i);
         AttributeSet childAttributes = child.getAttributes();
         if (childAttributes.getAttribute(StyleConstants.NameAttribute) == HTML.Tag.CONTENT) {
           int startOffset = child.getStartOffset();
           int endOffset = child.getEndOffset();
           int length = endOffset - startOffset;
           text.append(htmlDoc.getText(startOffset, length));
         }
       }
       System.out.println(name + ": " + text.toString());
     }
   }
 }

}

      </source>
   
  
 
  

AbstractDocument: setDocumentFilter(DocumentFilter filter)

   <source lang="java">

import javax.swing.JFrame; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.text.AbstractDocument; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DocumentFilter; public class UpcaseFilter extends DocumentFilter {

 public void insertString(DocumentFilter.FilterBypass fb, int offset, String text,
     AttributeSet attr) throws BadLocationException {
   fb.insertString(offset, text.toUpperCase(), attr);
 }
 public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text,
     AttributeSet attr) throws BadLocationException {
   fb.replace(offset, length, text.toUpperCase(), attr);
 }
 public static void main(String[] args) {
   DocumentFilter dfilter = new UpcaseFilter();
   JTextArea jta = new JTextArea();
   JTextField jtf = new JTextField();
   ((AbstractDocument) jta.getDocument()).setDocumentFilter(dfilter);
   ((AbstractDocument) jtf.getDocument()).setDocumentFilter(dfilter);
   JFrame frame = new JFrame("UpcaseFilter");
   frame.getContentPane().add(jta, "Center");
   frame.getContentPane().add(jtf, "South");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(200, 120);
   frame.setVisible(true);
 }

}

      </source>