import java.net.*;
import java.io.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class FetchURLPane {
  public static void main(String args[]) throws Exception {
    int argc = args.length;

    // Check for valid number of parameters
    if (argc != 1) {
      System.out.println ("Syntax :");
      System.out.println ("java FetchURL url");
      return;
    }

    // Catch any thrown exceptions
    try {
      // Create an instance of java.net.URL
      java.net.URL myURL = new URL ( args[0] );

      // Fetch the content, and read from an InputStream
      InputStream in = myURL.openStream();

      // creat and show HTML styled content in TextPane
      showUI(in);

      // Pause for user
      System.out.println ();
      System.out.println ("Hit enter to continue");
      System.in.read();

      System.exit(0);
    } catch (MalformedURLException mue) {
      System.err.println ("Unable to parse URL!");
      return;
    } catch (IOException ioe) {
      System.err.println ("I/O Error : " + ioe);
      return;
    }
  }

  public static void showUI(InputStream in) {
    // read data from inputstream
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
    String line;
    try {
      line = br.readLine();
    } catch (IOException e) {
      // nothing is retrieved
      System.out.println("Nothing is read.");
      return;
    }

    int index1 = line.indexOf("<title>");
    int index2 = line.indexOf("</title>");
    String msg = line.substring(index1+7, index2);

    JFrame frame = new JFrame(msg);
    Container c = frame.getContentPane();

    JTextPane textPane = new JTextPane();
    StyledDocument doc = textPane.getStyledDocument();

    // set style: normal
    MutableAttributeSet normal = new SimpleAttributeSet();

    // set style: center
    MutableAttributeSet h1 = new SimpleAttributeSet();
    StyleConstants.setAlignment(h1, StyleConstants.ALIGN_CENTER);
    StyleConstants.setBold(h1, true);

    // set style: italic
    MutableAttributeSet italic = new SimpleAttributeSet();
    StyleConstants.setItalic(italic, true);

    // set style: bold
    MutableAttributeSet bold = new SimpleAttributeSet();
    StyleConstants.setBold(bold, true);

    index1 = line.indexOf("<h1>");
    index2 = line.indexOf("</h1>");
    msg = line.substring(index1+4, index2);
    textPane.setText(msg + "\n");
    doc.setParagraphAttributes(0, index2 - index1 - 4, h1, true);

    // reset style
    doc.setParagraphAttributes(index2-index1-3, 0, normal, true);

    while(true) {
      try {
        line = br.readLine();
        if(line != null) {
          doc.insertString(doc.getLength(), line + "\n", null);
        }
        else
          break;
      } catch (Exception e) {}
    }

    JScrollPane scrollPane = new JScrollPane( textPane );
    scrollPane.setPreferredSize( new Dimension( 200, 200 ) );
    c.add(scrollPane);
    frame.setSize(500, 300);
    frame.setVisible(true);   
  }
}