请求域、请求转发、请求包含

 

 

 

 

 

 

 

 

 

 

 

public class HttpServletDemo1 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //设置共享数据
        req.setAttribute("userName", "hangman");
        //获取请求调度对象
        RequestDispatcher dispatcher = req.getRequestDispatcher("servletDemo2");

        //转发
        dispatcher.forward(req, resp);

        //包含
        dispatcher.include(req, resp);
    }

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

public class HttpServletDemo2 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取共享数据
        Object userName = req.getAttribute("userName");
        System.out.println(userName);
    }

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