用业务方法来获取系统中物品的种类：
@WebServlet(urlPatterns="/android/viewKind.jsp")public class ViewKindServlet extends BaseServlet{    public void service(HttpServletRequest request ,		HttpServletResponse response)		throws IOException , ServletException	{		// 获取业务逻辑组件		AuctionManager auctionManager = (AuctionManager)getCtx().getBean("mgr");		// 获取系统中所有物品种类		List<KindBean> kinds = auctionManager.getAllKind();		// 将所有物品种类包装成JSONArray		JSONArray jsonArr= new JSONArray(kinds);		response.setContentType("text/html; charset=GBK");		// 将JSONArray转换成JSON字符串后输出到客户端		response.getWriter().println(jsonArr.toString());	}}