searchscheduleservlet.java

来自「100多M的J2EE培训内容」· Java 代码 · 共 122 行

package slsbsample;

/*
 *
 * Copyright 2001, 2002 JavaCamp.com, Inc. All Rights Reserved.
 *
 * Grant the rights to the purchaser of the book to use the source code.
 * .
 * @author	Pravin Tulachan
 * @version	1.0
 * @see
 * @since
 *
 */

//package j2eebootcamp.developingEJB.chapter6.web.servlets;

import java.util.*;
import java.io.*;

import java.rmi.RemoteException;
import java.util.Vector;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.rmi.PortableRemoteObject;
import javax.naming.InitialContext;

/*import j2eebootcamp.developingEJB.chapter6.search.Schedule;
import j2eebootcamp.developingEJB.chapter6.search.ScheduleHome;
import j2eebootcamp.developingEJB.chapter6.model.ScheduleVO;*/

//import j2eebootcamp.developingEJB.util.Logger;

public class SearchScheduleServlet
    extends HttpServlet {

  Schedule remote;
  ScheduleHome home;

  PrintWriter out;
  RequestDispatcher dispatcher;
  public void init() throws ServletException {
    try {
      InitialContext ic = new InitialContext();
      Object objref = ic.lookup("Schedule");
      System.out.println(" == Servlet MySchedule lookup ok");
      home = (ScheduleHome) PortableRemoteObject.narrow(objref, ScheduleHome.class);
      remote = home.create();
      System.out.println(" == Servlet home.create ok");

    }
    catch (Exception e) {
      e.printStackTrace();
    }

  }

  public void doGet(HttpServletRequest req, HttpServletResponse res) throws
      ServletException, IOException {
    defaultAction(req, res);
  }

  public void displayMessage(HttpServletRequest req,
                             HttpServletResponse res,
                             String messageText) throws ServletException,
      IOException {
    res.setContentType("text/html");
    out = res.getWriter();
    out.println(messageText);
  }

  public void defaultAction(HttpServletRequest req, HttpServletResponse res) throws
      ServletException, IOException {

    //get a handle to the response object for output
    res.setContentType("text/html");

    /* extract name/value pair from the request object */
    String searchBy = req.getParameter("SearchBy");
    String searchToken = req.getParameter("SearchText");

    Vector vList = new Vector(20);

    try {

      //find out search option and perform search.
      if (searchBy.equals("courseTitle")) {
        vList = (Vector) remote.searchByCourseTitle(searchToken);
        System.out.println(" == Servlet searchByCourseTitle() ok");
        if (vList.isEmpty()) {
          out.println(" == empty vector exiting");
          System.exit(0);
        }
        req.setAttribute("vec", vList);
        System.out.println(" == Servlet - dispatching to JSP ");
        dispatcher = getServletContext().getRequestDispatcher(
            "/ShowSearchResult.jsp");
      }
      else if (searchBy.equals("courseID")) {
        ScheduleVO schedule = null;
        //int courseID = (new Integer(searchToken)).intValue();
        System.out.println("KAO,a little problem!");
        schedule = (ScheduleVO) remote.searchByScheduleID(searchToken);
        System.out.println(" == Servlet searchByScheduleID() ok");
        req.setAttribute("sched", schedule);
        System.out.println(" == Servlet - dispatching to JSP ");
        dispatcher = getServletContext().getRequestDispatcher(
            "/ShowSearchResult1.jsp");
      }
    }
    catch (RemoteException re) {
      re.printStackTrace();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
    dispatcher.forward(req, res);
  }

}