editeventaction.java

使用eclipse开发的web程序

package com.wrox.tourism.actions;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionServlet;

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

import java.io.IOException;

import java.sql.Connection;
import java.sql.SQLException;

import java.util.Collection;

import com.wrox.tourism.db.util.ConnectionPool;
import com.wrox.tourism.db.EventDAO;
import com.wrox.tourism.entity.Event;

public class EditEventAction extends Action {

  private ConnectionPool pool;

  public EditEventAction() {
    pool = ConnectionPool.getInstance();
  }

  public ActionForward perform(ActionMapping mapping,ActionForm form,
    HttpServletRequest request,HttpServletResponse response)
      throws IOException,ServletException {

    Connection con = null;

    ActionErrors errors = new ActionErrors();

    try {

      con = pool.getConnection();
      int eventId = Integer.parseInt(
        request.getParameter("eventId"));

      EventDAO eventDAO = new EventDAO(con);
      Event event = eventDAO.findByPrimaryKey(eventId);

      request.setAttribute(BeanNames.EVENT_FORM,event);

      return mapping.findForward("success");

    } catch (SQLException e) {
      e.printStackTrace();
      ActionError error = new ActionError("error.unexpected");
      errors.add(ActionErrors.GLOBAL_ERROR,error);
    } catch (Throwable e) {
      e.printStackTrace();
      ActionError error = new ActionError(e.getMessage());
      errors.add(ActionErrors.GLOBAL_ERROR,error);
    } finally {
      try {

        if (con != null)
          con.close();
      } catch (SQLException e) {
        throw new RuntimeException(e.getMessage());
      }
    }

    saveErrors(request,errors);
    return new ActionForward(mapping.getInput());

  }

}