spring cloud jackson自定义文本转换器

由于

spring.jackson.default-property-inclusion

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配置失效,所以得自定义文本转换器

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 <HttpMessageConverter <?>> 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 <MediaType> 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();
}

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以上能解决null字段不返回,并且字符串不会有两个双引号