controller.java

我的一些ejb的入门程序

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import stateful.CountBeanLocal;

public class Controller extends HttpServlet {
	private Context ctx;
	/**
	 * Constructor of the object.
	 */
	public Controller() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		CountBeanLocal cbl = null;
		HttpSession session = request.getSession();
		cbl = (CountBeanLocal) session.getAttribute("countBean");
		if(cbl == null){
			try {
				cbl = (CountBeanLocal) ctx.lookup("CountBean/local");
				session.setAttribute("countBean", cbl);
			} catch (NamingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out.println("count's value:" + cbl.count());
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
		try {
			ctx = new InitialContext();
		} catch (NamingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}