welcomeaction.java

采用Struts框架做的网上啤酒买卖系统

package com.cavaness.beer4all.catalog;

import org.apache.struts.action.*;
import com.cavaness.beer4all.framework.*;
import javax.servlet.http.*;
import com.cavaness.beer4all.service.Beer4AllService;
import java.util.List;
import com.cavaness.beer4all.util.Constants;

//这个类处理显示主页面的功能
public class WelcomeAction extends Beer4AllBaseAction {

  //获取主页面中的内容后，转发至main.jsp
  public ActionForward execute(ActionMapping mapping,
                               ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response)
    throws Exception{

    //通过Beer4AllBaseAction类的getBeer4AllService()方法，得到一个服务类对象
    Beer4AllService service = getBeer4AllService();
    //通过服务类对象，得到一个特色商品种类的集合对象
    List featuredCatalogs = service.getFeaturedCatalogs();
    //通过服务类对象，得到一个特色商品的集合对象
    List featuredItems = service.getFeaturedItems();
    //将两个列表添加到welcomeForm中,DynaActionForm是ActionForm类的子类
    ((DynaActionForm)form).set( "featuredCatalogs", featuredCatalogs );
    ((DynaActionForm)form).set( "featuredItems", featuredItems );
    //返回一个成功状态的映射
    return mapping.findForward( Constants.SUCCESS_KEY );
  }
}