Judging whether it is a mobile terminal or a PC terminal
tablet is a tablet computer

    public  String clientType(HttpServletRequest request) {
        String agent = request.getHeader("User-Agent").toLowerCase();
        if (agent.indexOf("ipad") > -1 || agent.indexOf("android") > -1 || agent.indexOf("iphone") > -1
              || agent.indexOf("tablet") > -1)   
            return mobileTerminal;
        else
            return pcTerminal;
    }