registrationservlet.java

Servlet与JSP核心编程第二版代码

package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Reads firstName and lastName request parameters and forwards
 *  to JSP page to display them. Uses session-based bean sharing
 *  to remember previous values.
 */

public class RegistrationServlet extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    HttpSession session = request.getSession();
    NameBean nameBean =
      (NameBean)session.getAttribute("nameBean");
    if (nameBean == null) {
      String firstName = request.getParameter("firstName");
      String lastName = request.getParameter("lastName");
      nameBean = new NameBean(firstName, lastName);
      session.setAttribute("nameBean", nameBean);
    }
    String address = "/WEB-INF/mvc-sharing/ShowName.jsp";
    RequestDispatcher dispatcher =
      request.getRequestDispatcher(address);
    dispatcher.forward(request, response);
  }
}