获取Servlet原生的API
只需要在控制器的方法参数定义HttpServletRequest和HttpServletResponse对象。
@RequestMapping("/testServlet")
public String testServlet(HttpServletRequest request, HttpServletResponse response) {
System.out.println("执行了。。。");
System.out.println(request);
HttpSession session = request.getSession();
System.out.println(session);
return "success";
} 
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