Java Web 047: 处理商品列表的查询

1.　　Goods.java

 2.　　DBUtil.java

public class DBUtil {
    public static Map<String,User> userMap = new HashMap<String,User>();
    
    public static List<Goods> goodsList = new ArrayList<Goods>();
    
    static {
        addUser(new User("Jasper","123",10,"男",true));
        addUser(new User("123","123",20,"女",true));
        
        goodsList.add(new Goods("Banana","From BeiJing",100,400));
        goodsList.add(new Goods("Cucumber","Very fresh",25,234));
        goodsList.add(new Goods("Apple","Crispy",90,435));
        goodsList.add(new Goods("Sausage","Delicious",15,124));
        goodsList.add(new Goods("Clothing","Look good",30,196));
    }
    
    private static void addUser(User user) {
        userMap.put(user.getUsername(), user);
    }
}

3.　　GoodsDao.java

public class GoodsDao {
    public List<Goods> getAllGoods(){
        return DBUtil.goodsList;
    }
}

4.　　GoodsService.java

public class GoodsService {
    public List<Goods> selectAllGoods(){
        return new GoodsDao().getAllGoods();
    }
}

5.　　GoodsListServlet.java

@WebServlet("/admin/goods_list")
public class GoodsListServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        List<Goods> list = new GoodsService().selectAllGoods();
        req.setAttribute("list", list);
        req.getRequestDispatcher("/admin/goods_list.jsp").forward(req, resp);    
    }
}