时间戳

    @RequestMapping("/j3")
    public String JsonDome3() throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        Date date = new Date();
        //自定义日期的格式
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd:HH:mm:ss");
        String s = simpleDateFormat.format(date);
        //ObjectMapper 时间解析后悔的默认格式为:Timestamp  时间戳
        return  mapper.writeValueAsString(s);
        //"2020-04-12:23:41:12"
    }

时间戳

    @RequestMapping("/j3")
    public String JsonDome3() throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();


        Date date = new Date();

        return  mapper.writeValueAsString(date);
    }