JSP and Java beans 3 : Beans « JSP « Java

JSP and Java beans 3

<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<jsp:useBean id="priceFetcher" class="com.java2s.StockPriceBean" />
<head><title>Price Fetch</title></head>
    <c:when test="${empty param.symbol}">
   <h2>Please submit a valid stock symbol</h2>
   <form method="POST" action ='<c:out value="${pageContext.request.contextPath}" />/priceFetch.jsp'>
   <table border="0"><tr><td valign="top">

   Stock symbol: </td>  <td valign="top"><input type="text" name="symbol" size="10"></td></tr><tr><td valign="top"><input type="submit" value="Submit Info"></td></tr></table></form>
   <h2>Here is the latest value of <c:out value="${param.symbol}" /></h2>
       <jsp:setProperty name="priceFetcher" property="symbol" value="<%= request.getParameter(\"symbol\") %>" />
       <jsp:getProperty name="priceFetcher" property="latestPrice"/>

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;

    public void handleText(char[] data,int pos){
        htmlText  = new String(data);
        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){
                stockVal = new Float(htmlText).floatValue();

            } catch (NumberFormatException ne) {
                    // tease out any commas in the number using 
                    java.text.NumberFormat nf = java.text.NumberFormat.
                    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!");
            lastTradeFlag = false;
            boldFlag = false;
      } //handleText


  public float getLatestPrice() throws IOException,MalformedURLException {

      stockSite = new URL(urlBase + symbol);
      webPageStream = new BufferedReader(new InputStreamReader(stockSite.
      htmlParser = new ParserDelegator();
      callback = new MyParserCallback();//ParserCallback

    //reset symbol
    symbol = "";

     return stockVal;



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