traderservlet.java

java ejb----html jsp

package com.genuitec.traderx.web;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @web.servlet name = "TraderServlet"
 *              display-name = "TraderServlet"
 * @web.servlet-init-param name = "trader.jndi.context"
 *                         value = "ejb/com/genuitec/trader/ejb/TraderHome"
 * @web.servlet-mapping "/doTrade"
 */
public class TraderServlet extends HttpServlet {

    private boolean initialized;
    private ArrayList initErrors;
    private TraderController controller;

    /**
     * Constructor for TraderServlet.
     */
    public TraderServlet() {
        super();
    }

    public void doGet(
        HttpServletRequest theRequest,
        HttpServletResponse theResponse)
        throws ServletException, IOException {

        if (!initialized) {
            ViewDispatcher.displayErrors(theRequest, theResponse, initErrors);
        }

        try {
            getController().doTrade(theRequest, theResponse);
        } catch (Exception ex) {
            //top-level exception handler
            ViewDispatcher.displayError(theRequest, theResponse, ex.toString());
        }

    }

    public void doPost(
        HttpServletRequest theRequest,
        HttpServletResponse theResponse)
        throws ServletException, IOException {

        doGet(theRequest, theResponse);
    }

    public void init() {
        String traderJNDIContext =
            getServletConfig().getInitParameter("trader.jndi.context");
        String errorMsg = null;
        boolean hasError = false;

        initErrors = new ArrayList();

        if (traderJNDIContext == null) {
            errorMsg = "Error: undefined servlet property \"trader.jndi.context\".";
            log(errorMsg);
            hasError = true;
            initErrors.add(errorMsg);
        }

        if (!hasError) {
            try {
                controller = new TraderController(this, traderJNDIContext);
            } catch (Exception ex) {
                log(ex.toString());
                initErrors.add(ex.toString());
                hasError = true;
            }
        }

        if (!hasError)
            initialized = true;
    }

    public void destroy() {
        controller = null;
    }

    protected TraderController getController() {
        return controller;
    }

}