org.springframework.http.converter.json.Jackson2ObjectMapperBuilder#build ( )源码实例Demo

/**
     * jackson 配置
     *
     * @return mapper
     */
    private static ObjectMapper createJackson() {
        Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder = Jackson2ObjectMapperBuilder.json();
        jackson2ObjectMapperBuilder.simpleDateFormat(DatePattern.NORM_DATETIME_PATTERN);
        ObjectMapper build = jackson2ObjectMapperBuilder.build();
        // 忽略空
        build.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        // 驼峰转下划线
        //        build.setPropertyNamingStrategy(new PropertyNamingStrategy.SnakeCaseStrategy());
        // long to String
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        build.registerModule(simpleModule);
        //
        build.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
//        build.activateDefaultTyping(objectMapper.getPolymorphicTypeValidator(), ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.WRAPPER_ARRAY);

        return build;
    }
 

@Bean
    public ObjectMapper objectMapper() {
        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();

        builder.featuresToDisable(
                SerializationFeature.WRITE_DATES_AS_TIMESTAMPS
        );

        builder.featuresToEnable(
                SerializationFeature.WRITE_DATES_WITH_ZONE_ID,
//                SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,
//                SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS,
//                DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS,
                DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT
        );

        builder.indentOutput(true);

        builder.failOnEmptyBeans(false);
        builder.failOnUnknownProperties(false);

        // do not include null value in json to make object graph smaller
        builder.serializationInclusion(JsonInclude.Include.NON_NULL);

        builder.modules(new GeoJsonModule(), new JavaTimeModule(), new MoneyModule());

        return builder.build();
    }
 

@Bean(name = "customObjectMapper")
    public ObjectMapper customObjectMapper() {
        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();

        builder.featuresToDisable(
                SerializationFeature.WRITE_DATES_AS_TIMESTAMPS
        );

        builder.featuresToEnable(
                SerializationFeature.WRITE_DATES_WITH_ZONE_ID,
//                SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,
//                SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS,
//                DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS,
                DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT
        );

        builder.indentOutput(true);

        builder.failOnEmptyBeans(false);
        builder.failOnUnknownProperties(false);

        // do not include null value in json to make object graph smaller
        builder.serializationInclusion(JsonInclude.Include.NON_NULL);

        builder.modules(new GeoJsonModule(), new JavaTimeModule(), new MoneyModule());

        return builder.build();
    }
 

@Bean
public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
    builder.failOnEmptyBeans(false);
    return builder.build();
}