How to use JSP and Java beans 3 in java

/*
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>

Please submit a valid stock symbol

Stock symbol:

Here is the latest value of

" />






*/
package com.java2s;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import java.net.URL;
import java.net.MalformedURLException;

import javax.swing.text.html.HTMLEditorKit.ParserCallback;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.html.parser.ParserDelegator;

public class StockPriceBean {

/**
* The URL base for requesting a stock price; it looks like
* "http://finance.yahoo.com/q?d=t&s="
*/
private static final String urlBase = "http://finance.yahoo.com/q?d=t&s=";

/**
* The character stream of HTML that is parsed for the stock price
* returned by java.net.URL.openStream()
*
* see java.net.URL
* @see java.io.BufferedReader
*/
private BufferedReader webPageStream = null;

/**
* The java.net.URL object that represents the stock Web page
*
*/
private URL stockSite = null;

/**
* The ParserDelegator object for which ParserDelegator.parse() is
* called for the Web page
*
* @see javax.swing.text.html.parser.ParserDelegator
*/
private ParserDelegator htmlParser = null;

/**
* The MyParserCallback object (inner class); this object is an
* argument to the ParserDelegator.parse() method
*
* @see javax.swing.text.html.HTMLEditorKit.ParserCallback
*/
private MyParserCallback callback = null;

/**
* This String holds the HTML text as the Web page is parsed.
*
* @see MyParserCallback
*/
private String htmlText = "";
private String symbol = "";
private float stockVal = 0f;

//A JavaBean has to have a no-args constructor (we explicitly show this
//constructor as a reminder; the compiler would have generated a default
//constructor with no arguments automatically
public StockPriceBean() {}

//Setter or mutator method for the stock symbol
public void setSymbol(String symbol){

this.symbol = symbol;
}

class MyParserCallback extends ParserCallback {

//bread crumbs that lead us to the stock price
private boolean lastTradeFlag = false;
private boolean boldFlag = false;

public MyParserCallback(){

//Reset the enclosing class' instance variable
if (stockVal != 0)
stockVal = 0f;

}

public void handleStartTag(javax.swing.text.html.HTML.Tag t,
MutableAttributeSet a,int pos) {

if (lastTradeFlag && (t == javax.swing.text.html.HTML.Tag.B )){

boldFlag = true;
}

}//handleStartTag

public void handleText(char[] data,int pos){

htmlText = new String(data);

//System.out.println(htmlText);

if (htmlText.indexOf("No such ticker symbol.") != -1){

throw new IllegalStateException(
"Invalid ticker symbol in handleText() method.");

} else if (htmlText.equals("Last Trade:")){

lastTradeFlag = true;

} else if (boldFlag){

try{

stockVal = new Float(htmlText).floatValue();

} catch (NumberFormatException ne) {

try{

// tease out any commas in the number using
//NumberFormat

java.text.NumberFormat nf = java.text.NumberFormat.
getInstance();

Double f = (Double) nf.parse(htmlText);

stockVal = (float) f.doubleValue();

} catch (java.text.ParseException pe){

throw new IllegalStateException(
"The extracted text " + htmlText +
" cannot be parsed as a number!");

}//try
}//try

lastTradeFlag = false;
boldFlag = false;

}//if

} //handleText

}//MyParserCallback

public float getLatestPrice() throws IOException,MalformedURLException {

stockSite = new URL(urlBase + symbol);

webPageStream = new BufferedReader(new InputStreamReader(stockSite.
openStream()));

htmlParser = new ParserDelegator();

callback = new MyParserCallback();//ParserCallback

synchronized(htmlParser){

htmlParser.parse(webPageStream,callback,true);

}//synchronized

//reset symbol
symbol = "";

return stockVal;

}//getLatestPrice

}//StockPriceBean