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public class test01 extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        ServletContext context = this.getServletContext();        String username = "小明";        context.setAttribute("username", username);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        doGet(req, resp);    }}

用getServletContext方法得到ServletContext对象，并且用setAttribute() 将数据进行存储

public class GetServlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        ServletContext context = this.getServletContext();        String username = (String) context.getAttribute("username");        resp.setContentType("text/html");        resp.setCharacterEncoding("utf-8");        resp.getWriter().println( "姓名：" + username);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        doGet(req, resp);    }}

用getAttribute()方法拿到存储的数据，然后在配置Servlet和Servlet的映射

启动服务就可以在浏览器中进行展示

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