enterplayeraction.java

使用Servlet和JSP进行Web组件开发

package sl314.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
// Struts classes
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
// Model classes
import sl314.model.RegisterService;
import sl314.model.Player;
import java.util.List;
import java.util.LinkedList;


public class EnterPlayerAction extends Action {

  public ActionForward execute(ActionMapping mapping, ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response) {

    // Keep a set of strings to record form processing errors.
    List errorMsgs = new LinkedList();
    // Store this set in the request scope, in case we need to
    // send the ErrorPage view.
    request.setAttribute("errorMsgs", errorMsgs);

    try {

      // Retrieve form parameters.
      String name = request.getParameter("name").trim();
      String address = request.getParameter("address").trim();
      String city = request.getParameter("city").trim();
      String province = request.getParameter("province").trim();
      String postalCode = request.getParameter("postalCode").trim();

      // Verify 'Enter Player Information' form fields
      if ( name.length() == 0 ) {
        errorMsgs.add("You must enter your full name.");
      }
      if (   (address.length() == 0)  || (city.length() == 0)
          || (province.length() == 0) || (postalCode.length() == 0) ) {
        errorMsgs.add("You must enter your full address.");
      }

      // Send the ErrorPage view if there were errors
      if ( ! errorMsgs.isEmpty() ) {
        return mapping.findForward("error");
      }

      // Perform business logic
      RegisterService registerSvc = new RegisterService();

      // Update the player info
      Player player = registerSvc.getPlayer(name);
      player.setAddress(address);
      player.setCity(city);
      player.setProvince(province);
      player.setPostalCode(postalCode);

      // Store the player object in the session-scope
      HttpSession session = request.getSession();
      session.setAttribute("player", player);

      // Send the Success view
      return mapping.findForward("success");

    // Handle any unusual exceptions
    } catch (RuntimeException e) {
      // Log stack trace
      e.printStackTrace(System.err);

      // Send the Error view if there were errors
      errorMsgs.add(e.getMessage());
      return mapping.findForward("error");

    } // END of try-catch block

  } // END of execute method

} // END of RegisterAction class