~~~ • HttpServletRequest • HttpServletResponse • HttpSession • java.security.Principal • Locale • InputStream • OutputStream • Reader • Writer ~~~ ~~~ @RequestMapping("/testServletAPI") public void testServletAPI(HttpServletRequest request,HttpServletResponse response) throws IOException { response.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=UTF-8"); System.out.println(request+" "+ response); PrintWriter out=response.getWriter(); out.write("test servlet api 哈哈哈哈"); } ~~~