我一直无法找到如何在 spring boot 1.4 中使用 Jackson2ObjectMapperBuilderCustomizer.java 来自定义 Jackson 的功能的示例。
在 boot 1.4 中自定义 Jackson 的文档 - https://docs.spring.io/spring-boot/docs/1.4.x/reference/htmlsingle/#howto-customize-the-jackson-objectmapper
我的配置有效，但我不确定这是否是使用 Jackson2ObjectMapperBuilderCustomizer.java 自定义对象映射器的正确方法
@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，这个类位于我自己的 REST 服务 spring 启动项目中，它只是自动配置许多东西，比如 ControllerAdvice 和一些像上面这样的琐碎功能。
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。
最佳答案
要自定义 Spring Boot 已经预先配置的 Jackson ObjectMapper，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 是如何获取它的:
@Component
public class BigDecimalDeserializer extends StdDeserializer<BigDecimal> {
public BigDecimalDeserializer() {
super(BigDecimal.class);
}
@Override
public BigDecimal deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
...
}
...
}
关于java - 如何在 Spring Boot 1.4 中自定义 Jackson，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39263553/