如何在 Spring Boot 应用程序中配置 Jackson 而不覆盖纯 Java 中的 springs 默认设置 [英] How to configure Jackson in spring boot application without overriding springs default setting in pure java

问题描述

在我的 Spring Boot 应用程序中，我使用 Jackson 通过在需要的地方注入 ObjectMapper 来序列化对象.我找到了这个答案:https://stackoverflow.com/a/32842962/447426但是这个创建了一个新的映射器 - 使用 jacksons 默认设置.

In my spring boot application i am using Jackson to serialize objects by injecting the ObjectMapper where needed. I found this answer: https://stackoverflow.com/a/32842962/447426 But this one creates a new mapper - with jacksons default settings.

另一方面，我发现 this 在官方文档中.我没有真正理解.没有示例代码.

On the other hand i found this in official docu. I didn't really understand. There is no example code.

那么如何在 Spring 的默认对象映射器的基础上配置 springs ObjectMapper 呢?

So how to configure springs ObjectMapper on base of Spring's default object mapper?

此配置应在ObjectMapper"上处于活动状态；无论在哪里注射.

This configuration should be active on "ObjectMapper" whereever injected.

推荐答案

你应该使用 Jackson2ObjectMapperBuilderCustomizer 来解决这个问题

You should use Jackson2ObjectMapperBuilderCustomizer for this

@Configuration
public class JacksonConfiguration {

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer addCustomBigDecimalDeserialization() {
        return new Jackson2ObjectMapperBuilderCustomizer() {

            @Override
            public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
               jacksonObjectMapperBuilder.featuresToDisable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
               // Add your customization
               // jacksonObjectMapperBuilder.featuresToEnable(...)      
            }
        };
    }
}

---

因为 Jackson2ObjectMapperBuilderCustomizer 是一个函子，Java 8 支持更紧凑的代码:

---

Because a Jackson2ObjectMapperBuilderCustomizer is a functor, Java 8 enables more compact code:

@Configuration
public class JacksonConfiguration {

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer addCustomBigDecimalDeserialization() {
        return builder -> {
            builder.featuresToDisable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
            // Add your customization
            // builder.featuresToEnable(...)      
            };
        }
    }
}

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