在春季配置对象映射器

json java spring jackson object-object-mapping

2022-08-31 09:49:41

我的目标是以它只序列化元素的方式配置，这些元素用.objectMapper@JsonProperty

为了做到这一点，我遵循了这个解释，它说如何配置对象映射器。

我包含了自定义对象映射器，如此处所述。

但是，当类被序列化时，它仍然包含json中的所有属性。NumbersOfNewEvents

有人有提示吗？提前致谢

杰克逊 1.8.0 春季 3.0.5

自定义对象映射器

public class CompanyObjectMapper extends ObjectMapper {
    public CompanyObjectMapper() {
        super();
        setVisibilityChecker(getSerializationConfig()
                .getDefaultVisibilityChecker()
                .withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
                .withFieldVisibility(JsonAutoDetect.Visibility.NONE)
                .withGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withSetterVisibility(JsonAutoDetect.Visibility.DEFAULT));
    }
}

servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="de.Company.backend.web" />

    <mvc:annotation-driven />

    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                    <property name="objectMapper" ref="jacksonObjectMapper" />
                </bean>
            </list>
        </property>
    </bean>

    <bean id="jacksonObjectMapper" class="de.Company.backend.web.CompanyObjectMapper" />
</beans>

新事件的数量

public class NumbersOfNewEvents implements StatusAttribute {

    public Integer newAccepts;
    public Integer openRequests;

    public NumbersOfNewEvents() {
        super();
    }
}

答案 1

使用Spring Boot（1.2.4）和Jackson（2.4.6），以下基于注释的配置对我有用。

@Configuration
public class JacksonConfiguration {

    @Bean
    public ObjectMapper objectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);

        return mapper;
    }
}

答案 2

这可能是因为我使用的是Spring 3.1（而不是你指定的Spring 3.0.5），但Steve Eastwood的答案对我不起作用。此解决方案适用于 Spring 3.1：

在你的春季 xml 上下文中：

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
        <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
        <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
            <property name="objectMapper" ref="jacksonObjectMapper" />
        </bean>        
    </mvc:message-converters>
</mvc:annotation-driven>

<bean id="jacksonObjectMapper" class="de.Company.backend.web.CompanyObjectMapper" />