控制层跳转：1）调用别人接口；2）指定页面

    @RequestMapping(value = "sso", method = RequestMethod.GET)
    public void sso(HttpServletRequest request, HttpServletResponse response) throws IOException {
        List<Users> users = usersService.findUsers("loginName", "testuser1");
        Users user = users.get(0);
        String url = "http://10.92.2.146/user/signin";
        url = String.format("%s?account=%s&password=%s", url, user.getLoginName(), user.getPassword());
        response.sendRedirect(url);
    }