catalogdispatchaction.java

采用Struts框架做的网上啤酒买卖系统

package com.cavaness.beer4all.catalog;

import java.util.List;
import org.apache.struts.action.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.cavaness.beer4all.service.Beer4AllService;
import com.cavaness.beer4all.framework.Beer4AllBaseDispatchAction;
import com.cavaness.beer4all.catalog.view.CatalogView;
import com.cavaness.beer4all.catalog.view.ItemView;
import com.cavaness.beer4all.util.Constants;
//这个类处理显示商品信息页面的功能
public class CatalogDispatchAction extends Beer4AllBaseDispatchAction{

  //获取一个映射，在配置中是转发至beer.jsp
  public ActionForward viewItem(ActionMapping mapping,
                                ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response)
    throws Exception {
    //从请求中获取商品ID
    String itemId = request.getParameter( Constants.ID_KEY );
    //获取一个公共服务接口
    Beer4AllService service = getBeer4AllService();
    //在商品信息类中获得依据商品ID查找商品信息的服务
    ItemView itemView = service.getItemById( itemId );
    //将商品信息作为参数置入请求对象中
    request.setAttribute( Constants.ITEMVIEW_KEY, itemView );
    //获取商品目录列表
    List featuredCatalogs = service.getFeaturedCatalogs();
    //将商品目录列表作为参数置入请求对象中
    request.setAttribute( "featuredCatalogs", featuredCatalogs );
    //返回一个成功映射
    return mapping.findForward(Constants.SUCCESS_KEY);
  }
}