package com.jeelearning.servlet;import java.io.IOException;import javax.servlet.RequestDispatcher;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class SetAttributeServlet */@WebServlet("/setAttribute")public class SetAttributeServlet extends HttpServlet {    private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public SetAttributeServlet() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        response.setCharacterEncoding("utf-8");        response.setContentType("text/html;charset=utf-8");        ServletContext servletctx = getServletContext();        HttpSession session = request.getSession();                servletctx.setAttribute("applicationAttribute", "应用范围属性");        session.setAttribute("sessionAttribute", "会话范围属性");        request.setAttribute("requestAttribute", "请求范围属性");                RequestDispatcher view = request.getRequestDispatcher("getAttribute");        view.forward(request, response);            }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doGet(request, response);    }}

package com.jeelearning.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class GetAttributeServlet */@WebServlet("/getAttribute")public class GetAttributeServlet extends HttpServlet {    private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public GetAttributeServlet() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        response.setCharacterEncoding("utf-8");        response.setContentType("text/html;charset=utf-8");        ServletContext servletctx = getServletContext();        HttpSession session = request.getSession();        PrintWriter out = response.getWriter();                out.println("应用范围属性: ");        out.println(servletctx.getAttribute("applicationAttribute"));        out.println("
");        out.println("会话范围属性: ");        out.println(session.getAttribute("sessionAttribute"));        out.println("
");        out.println("请求范围属性: ");        out.println(request.getAttribute("requestAttribute"));        out.println("
");    }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doGet(request, response);    }}