spring cloud jackson自定义文本转换器

1. 由于

   spring.jackson.default-property-inclusion
   

   image.gif

   配置失效,所以得自定义文本转换器

2. 废话不多说上代码

   @Configuration
   @EnableWebMvc
   public class WebAppConfig implements WebMvcConfigurer {
   
       /**
        * 添加到消息转换器
        * @param converters
        */
       @Override
   public void configureMessageConverters(List > converters) {
       //如果放在jacson下面会出现字符串多一个的问题
       converters.add(stringHttpMessageConverter());
       converters.add(jackson2HttpMessageConverter());
   }
   
       /**
        * 处理返回json格式
        * 定义时间格式转换器
        * @return MappingJackson2HttpMessageConverter
        */
       @Bean
   public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {
       MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
       ObjectMapper mapper = new ObjectMapper();
       mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
       //主要是这句处理
       mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
       //时间格式化
       mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
       converter.setObjectMapper(mapper);
   
       List  list = Arrays.asList(
               MediaType.APPLICATION_JSON,
               MediaType.ALL);//防止spring boot admin报错(No converter for [class org.springframework.boot.actuate.health.Sy
   stemHealth] with preset Content-Type 'null')
       converter.setSupportedMediaTypes(list);
       return converter;
   }
   
   //或者这样
   @Bean
   public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {
       ObjectMapper mapper = new ObjectMapper();
       mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
       //主要是这句处理
       mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
       //时间格式化
       mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
       MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter(mapper);
       return converter;
   }
   
   @Bean
   public StringHttpMessageConverter stringHttpMessageConverter() {
       return new StringHttpMessageConverter();
   }
   

   image.gif

   以上能解决null字段不返回,并且字符串不会有两个双引号