[经验] 关于 Java 中的非空判断

    @ResponseBody
    @RequestMapping(value = "test",method = RequestMethod.GET,produces = "application/json;charset=UTF-8")
    public Result<String> test(String user,String number,String time){
        String type="error";
        try{
            rType = SendType.create_send.toString();
            return firstSendService.createSend(type,uName,pNum,time);
        }catch (Exception ex){
            LOGGER.error(ex.getMessage(),ex);
        }
        return Result.failure(type,"fail of connect");
    }

    public Result<String> createSend(String type,String user,String time) throws Exception {
        String token = "not fond";
        try{
            if(user.isEmpty() && StringUtils.isBlank(user)){
                return Result.failure(type,"user is not null");
            }
            StringBuffer stringBuffer = new StringBuffer();
            stringBuffer.append(user).append(time);
            String signChar = stringBuffer.toString();
            token = TokenUtil.sign(signChar);
        }catch (Exception ex){
            LOGGER.error(ex.getMessage(),ex);
        }
        return Result.success(type,token);
    }

if(user.isEmpty() && StringUtils.isBlank(user)){
    return Result.failure(type,"user is not null");
}