@Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); response.setStatus(HttpServletResponse.SC_OK); String code = request.getParameter("code"); try { response.getWriter().println("<h1>code</h1>"); response.getWriter().println(code); WxMpOAuth2AccessToken wxMpOAuth2AccessToken = this.wxMpService.oauth2getAccessToken(code); response.getWriter().println("<h1>access token</h1>"); response.getWriter().println(wxMpOAuth2AccessToken.toString()); WxMpUser wxMpUser = this.wxMpService.oauth2getUserInfo(wxMpOAuth2AccessToken, null); response.getWriter().println("<h1>user info</h1>"); response.getWriter().println(wxMpUser.toString()); wxMpOAuth2AccessToken = this.wxMpService.oauth2refreshAccessToken(wxMpOAuth2AccessToken.getRefreshToken()); response.getWriter().println("<h1>after refresh</h1>"); response.getWriter().println(wxMpOAuth2AccessToken.toString()); } catch (WxErrorException e) { e.printStackTrace(); } response.getWriter().flush(); response.getWriter().close(); }