baseaction.java

系统分为用户模块和管理员模块两大部分。 普通用户只能查看、搜索和购买图书。搜索有按书籍的类别、书籍名称、出版社名称、上架时间等条件的查询。购买方式有选择邮递和特快等方式。购物车的设计有记录某用户购买

package bookshop.base;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import bookshop.tools.constant.BookShopConstant;

import com.jstu.dto.UserDTO;


public abstract class BaseAction extends Action {
	
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		
		UserDTO userDTO = (UserDTO) request.getSession().getAttribute("user");		
		
		if (userDTO != null) {
			try {
				//调用子类的实现方法
				myexecute(form,request, response);

				return mapping.findForward(BookShopConstant.SUCCESS);
			} catch (Exception e) {
				request.setAttribute(BookShopConstant.EXCEPTION,e);
				return mapping.findForward(BookShopConstant.FAIL);
			}
		}
		else{
			request.setAttribute(BookShopConstant.EXCEPTION,new Exception(BookShopConstant.NOT_LOAD));
			return mapping.findForward(BookShopConstant.FAIL);
		}
	}

	public abstract void myexecute(
			ActionForm form,HttpServletRequest request, HttpServletResponse response)
			throws Exception;

}