Servlet cdi Analysis

@WebServlet("/cdiservlet")      //url映射
public class NewServlet extends HttpServlet {    //声明一个NewServlet类，并继承HttpServlet类
    private Message message;

    @Override             //重写doGet方法
    public void init() {
        message = new MessageB();    //对message初始化
    }

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
                  throws IOException {              //抛出可能出现IO异常
        response.getWriter().write(message.get());   //捕获可能发生的异常
    }
}