ServletContext与三大作用域对象

ServletContext(Servlet上下文对象)，是web应用全局对象。

一个Web应用只会创建一个ServletContext对象

Java Web 三大作用域对象

HttpServletRequest - 请求对象

HttpSession - 用户会话对象

ServletContext - web应用全局对象

ServletContext context = request.getServletContext();
context.setAttribute("content", "© 2020 imooc.com 京ICP备 12003892号-11");
context.setAttribute("title", "<h1>幕课网</h1>");

response.setContentType("text/html;charset=utf-8");

response.getWriter().println("ServletContext 学习");

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ServletContext context = request.getServletContext();
String name = (String)context.getAttribute("content");
String title = (String)context.getAttribute("title");

response.setContentType("text/html;charset=utf-8");

response.getWriter().println("<h1>"+name+"</h1>"+title);