helperaction.java

我在加拿大学习的一个比较复杂的在线银行程序.

package com.ebusiness.ebank.action;

import java.util.Map;
import java.util.Set;
import java.util.List;
import java.util.Iterator;
import javax.servlet.ServletException;
import javax.servlet.ServletContext;

import org.apache.struts.action.Action;
import org.apache.struts.action.PlugIn;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.ModuleConfig;

import com.ebusiness.ebank.util.StaticDBData;
import com.ebusiness.ebank.util.OptionLabelValue;


/**
 * <p>Title: </p>
 * <p>Description: This class is an extension to ActionServlet class so that you can
 *                 use it to initialize application scope data</p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: eBusiness Inc., All right reserved</p>
 * @author unascribed
 * @version 1.0
 */

import org.apache.log4j.Logger;
import org.apache.log4j.MDC;

public class HelperAction extends Action implements PlugIn{

    private Logger log = Logger.getLogger(this.getClass());

    public void init(ActionServlet servlet, ModuleConfig config)  throws ServletException
    {
        ServletContext ctx = servlet.getServletContext();
        StaticDBData dbData = StaticDBData.getInstance();
        MDC.put("userid", "eBank System");
        this.setAppAttribute(dbData.getCountryMap(), ctx); //set country values
        this.setAppAttribute(dbData.getStateProvMap(), ctx); //set state/province values
        this.setAppAttribute(dbData.getFlagMap(), ctx); //set flag values
    }

    //Helper method to set application data to ServletContext
    //To see how the keys are constructed, please refer to StaticDBData class
    private void setAppAttribute(Map map, ServletContext ctx)
    {
        Set keys = map.keySet();
        String key = "";
        List list;
        for (Iterator i = keys.iterator(); i.hasNext();)
        {
            key =  (String)i.next();
            log.info("\nKey: " + key);
            list = (List)map.get(key);
            for (Iterator li = list.iterator(); li.hasNext();)
                log.info("\nValues: " + ((OptionLabelValue)li.next()).toString());
            ctx.setAttribute(key, (List)map.get(key));
        }
    }

    public void destroy(){}
}