场景

controller

@GetMapping("/userInfo")
public string userInfo( ModelMap mmap){
  UserInfo user = new UserInfo();
  user.setRegDate(new Date());
  user.setName("测试");
  mmap.put("userInfo",user);
  return "userInfo";
}

userInfo.html

<div id="app">
    用户名称：{{userInfo.name}}<br/>
    注册日期：{{userInfo.regDate}}
</div>
<script th:inline="javascript">
   var userInfo= [[${userInfo}]];
   var app = new Vue({
        el:"#app",
        data(){
          return {
                userInfo:userInfo
            }
       }
  });
</script>

@Configuration
public class ThymeleafConfig {
    @PostConstruct
    public void init() {
        SpringTemplateEngine springTemplateEngine = SpringUtils.getBean(SpringTemplateEngine.class);
         SpringStandardDialect springStandardDialect = CollectionUtils.findValueOfType(springTemplateEngine.getDialects(), SpringStandardDialect.class);
        IStandardJavaScriptSerializer standardJavaScriptSerializer = springStandardDialect.getJavaScriptSerializer();
      
        // 通过反射获取 ObjectMapper 
        Field field = ReflectionUtils.findField(standardJavaScriptSerializer.getClass(), "delegate");
        ReflectionUtils.makeAccessible(field);
        Object delegate = ReflectionUtils.getField(field, standardJavaScriptSerializer);
        Field field2 = ReflectionUtils.findField(delegate.getClass(), "mapper");
        ReflectionUtils.makeAccessible(field2);
        ObjectMapper objectMapper = (ObjectMapper) ReflectionUtils.getField(field2, delegate);
        // 设置新的格式化日期规则
        objectMapper.setDateFormat(new JacksonThymeleafISO8601DateFormat2());
    }

    private static final class JacksonThymeleafISO8601DateFormat2 extends DateFormat {
        private static final long serialVersionUID = 1354081220093875129L;
        private SimpleDateFormat dateFormat;

        JacksonThymeleafISO8601DateFormat2() {
            super();
            // 主要修改地方
            this.dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            setCalendar(this.dateFormat.getCalendar());
            setNumberFormat(this.dateFormat.getNumberFormat());
        }


        @Override
        public StringBuffer format(final Date date, final StringBuffer toAppendTo, final FieldPosition fieldPosition) {
            final StringBuffer formatted = this.dateFormat.format(date, toAppendTo, fieldPosition);
            return formatted;
        }


        @Override
        public Date parse(final String source, final ParsePosition pos) {
            throw new UnsupportedOperationException(
                    "JacksonThymeleafISO8601DateFormat should never be asked for a 'parse' operation");
        }


        @Override
        public Object clone() {
            JacksonThymeleafISO8601DateFormat2 other = (JacksonThymeleafISO8601DateFormat2) super.clone();
            other.dateFormat = (SimpleDateFormat) dateFormat.clone();
            return other;
        }
    }
}