ServletContext概述和ServletContext获取
ServletContext概述
概念:代表整个web应用,可以和程序的容器(服务器)来通信
功能:
1.获取MIME类型:
2.域对象:共享数据
3.获取文件的真实(服务器)路径
ServletContext获取
1.通过request对象获取
request.getServletContext();
2.通过HTTPServlet获取
this.getServletContext();
@WebServlet("/servletContextD1") public class ServletContextD1 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { /* 1.通过request对象获取 request.getServletContext(); 2.通过HTTPServlet获取 this.getServletContext(); */ //1.通过request对象获取 ServletContext context1 = req.getServletContext(); //2.通过HTTPServlet获取 ServletContext context2 = this.getServletContext(); System.out.println(context1); System.out.println(context2); System.out.println(context1==context2); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } }
获取出来是一样的