index**页面**：

    1. <!DOCTYPE html>
    2. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <title>Title</title>
    6. </head>
    7. <body>
    8.     <h1>首页</h1>
    9.     <a th:href="@{/testApplication}">取出Application域共享数据</a><br>
    10. </body>
    11. </html>

    controller：

    package com.way.controller;

import com.way.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@Controller
public class MyController2 {

    @RequestMapping(value = "/testApplication")
    public String testApplication(HttpSession session){

        ServletContext application = session.getServletContext();

        application.setAttribute("key1","Application1");
        application.setAttribute("key2","Application2");
        return "target";
    }
}

    target页面：

    <!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>target页面</h1>
    <p th:text="${application.key1}"></p>
    <p th:text="${application.key2}"></p>
</body>
</html>

    浏览器输出结果：
    image.png