stockpricehandler.java

J2EE开发与Weblogic一书中的源代码

package com.learnweblogic.examples.ch4;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class StockPriceHandler extends TagSupport {

	private String myTickerSymbol;
	private String price = "25 cents";

	public String getTickerSymbol() {
		return myTickerSymbol;
	}

	public void setTickerSymbol(String ts) {
		myTickerSymbol = ts;
	}

    public int doStartTag() throws JspException {
        /*
          You could place any work that you want to have done here. 
          
          This method returns a status code.  There a number of different
          options for these codes, which are discussed later in this 
          section.  This one instructs WebLogic not to evaluate any 
          expressions inside of the body of the tag.
        
          At this point, you would insert code to go out and 
          get the stock price from your source.  Take that value and 
          put it into a string variable named 'price'.
        */

        String stockPrice = price;

        try {
            JspWriter out = pageContext.getOut();
            out.print(myTickerSymbol + ":" + price);
        } catch (Exception e) {
            e.printStackTrace();
            throw new JspException(e.getMessage());
        }
        return (SKIP_BODY);
    }

	/* 
	   Called when the container wants to dispose of the current
	   tag library. 
	*/
	public void release() {
		myTickerSymbol = null;
		super.release();
	}

}