哪个地方添加的MappingJackson2HttpMessageConverter

spring4零配置
一般通过WebMvcConfigurationSupport加载默认对象

要用extends 才能得到默认加载converters
不要用configure

 @Override
		public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
		 super.extendMessageConverters(converters);
		 for(HttpMessageConverter<?> httpMessageConverter : converters)
		 	{
		 		if(httpMessageConverter instanceof MappingJackson2HttpMessageConverter)
		 		{
		 			MappingJackson2HttpMessageConverter convert = (MappingJackson2HttpMessageConverter)httpMessageConverter;
		 			ObjectMapper objectMapper = convert.getObjectMapper();
		 			objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd"));
		 		}
		 	}
		}