我一直无法找到如何使用的示例Jackson2ObjectMapperBuilderCustomizer.java在spring boot 1.4中自定义Jackson的功能。
boot 1.4 中自定义 Jackson 的 doco -https://docs.spring.io/spring-boot/docs/1.4.x/reference/htmlsingle/#howto-customize-the-jackson-objectmapper https://docs.spring.io/spring-boot/docs/1.4.x/reference/htmlsingle/#howto-customize-the-jackson-objectmapper
我的配置有效，尽管我不确定这是否是使用自定义对象映射器的正确方法Jackson2ObjectMapperBuilderCustomizer.java
@Configuration
public class JacksonAutoConfiguration {
@Autowired
private Environment env;
@Bean
public Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder(
List<Jackson2ObjectMapperBuilderCustomizer> customizers) {
Jackson2ObjectMapperBuilder builder = configureObjectMapper();
customize(builder, customizers);
return builder;
}
private void customize(Jackson2ObjectMapperBuilder builder,
List<Jackson2ObjectMapperBuilderCustomizer> customizers) {
for (Jackson2ObjectMapperBuilderCustomizer customizer : customizers) {
customizer.customize(builder);
}
}
private Jackson2ObjectMapperBuilder configureObjectMapper() {
Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
List<String> activeProfiles = asList(env.getActiveProfiles());
if (activeProfiles.contains(SPRING_PROFILE_DEVELOPMENT)) {
builder.featuresToEnable(SerializationFeature.INDENT_OUTPUT);
}
return builder;
}
}
为了提供一些上下文，此类位于我自己的 REST 服务 Spring 启动项目中，该项目仅自动配置许多内容，例如 ControllerAdvice 和上面的一些琐碎功能。
所以我的目标是扩展 Jackson 配置，而不是覆盖 boot 或其他包提供的任何配置。
定制杰克逊ObjectMapperSpring Boot 已经预先配置好了，我能够做到这一点（这里的示例是添加自定义反序列化器）。
配置类：
@SpringBootConfiguration
public class Application {
@Autowired
private BigDecimalDeserializer bigDecimalDeserializer;
...
@Bean
public Jackson2ObjectMapperBuilderCustomizer addCustomBigDecimalDeserialization() {
return new Jackson2ObjectMapperBuilderCustomizer() {
@Override
public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
jacksonObjectMapperBuilder.deserializerByType(BigDecimal.class, bigDecimalDeserializer);
}
};
}
...
}
还有我的自定义反序列化器，以展示 Spring 如何拾取它：
@Component
public class BigDecimalDeserializer extends StdDeserializer<BigDecimal> {
public BigDecimalDeserializer() {
super(BigDecimal.class);
}
@Override
public BigDecimal deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
...
}
...
}
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