springboot配置jackjson规则

springboot 整合jackson自定义配置

先看下jackjson的自动配置源码：

    @Configuration(proxyBeanMethods = false)
	@ConditionalOnClass(Jackson2ObjectMapperBuilder.class)
	static class JacksonObjectMapperBuilderConfiguration {

		@Bean
		@Scope("prototype")
		@ConditionalOnMissingBean
		Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder(ApplicationContext applicationContext,
				List<Jackson2ObjectMapperBuilderCustomizer> customizers) {
			Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
			builder.applicationContext(applicationContext);
			customize(builder, customizers);
			return builder;
		}

		private void customize(Jackson2ObjectMapperBuilder builder,
				List<Jackson2ObjectMapperBuilderCustomizer> customizers) {
			for (Jackson2ObjectMapperBuilderCustomizer customizer : customizers) {
				customizer.customize(builder);
			}
		}

	}

发现它的customize方法会加载所有的实现了Jackson2ObjectMapperBuilderCustomizer的customize方法

所以在自定义配置jackjson规则的时候，可以实现此接口来操作：

@Configuration
public class JacksonBuilderCustom implements Jackson2ObjectMapperBuilderCustomizer {
    private static final String STANDARD_PATTERN = "yyyy-MM-dd HH:mm:ss";

    private static final String DATE_PATTERN = "yyyy-MM-dd";

    private static final String TIME_PATTERN = "HH:mm:ss";

    @Override
    public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
        jacksonObjectMapperBuilder.timeZone("GMT+8");

        JavaTimeModule javaTimeModule = new JavaTimeModule();
        // 处理localDateTime
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(STANDARD_PATTERN);
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(dateTimeFormatter));
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(dateTimeFormatter));

        // 处理LocalDate
        DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern(DATE_PATTERN);
        javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(dateFormatter));
        javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(dateFormatter));

        // 处理LocalTime
        DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern(TIME_PATTERN);
        javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(timeFormatter));
        javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(timeFormatter));

        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(new ToStringSerializer(Long.TYPE));
        simpleModule.addSerializer(new ToStringSerializer(Long.class));
        simpleModule.addSerializer(new ToStringSerializer(BigInteger.class));

        jacksonObjectMapperBuilder
                .simpleDateFormat(STANDARD_PATTERN)
                .modules(javaTimeModule, simpleModule, new Jdk8Module())
                .serializationInclusion(JsonInclude.Include.ALWAYS)
                .failOnEmptyBeans(false)
                .failOnUnknownProperties(false)
                .featuresToEnable(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN)
                .featuresToDisable(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN);
    }
}