@WebServlet的学习

Posted 2021-05-29 唐僧喜欢小龙女

1、@WebServlet的作用

简化了配置，不用在web.xml中配置好多的 <servlet>的标签了，需要tomcat版本要7 及以上

2、用法

@WebServlet("/hello")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String method =  req.getParameter("method");

        if(method.equals("add")){

            req.getSession().setAttribute("msg","执行了add 方法");

        }

        if(method.equals("delete")){
            req.getSession().setAttribute("msg","执行了delete方法");
        }

        //转发
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);
        //重定向
        // resp.sendRedirect();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);


    }
}

 

3、测试