spring - 如何在 Spring 中设置自定义 Mongo 格式化程序？

Question

我已经在这工作了几个小时，但还没有找到任何人让这个工作。我想在 Mongo 中保留一个 BigDecimal 对象，但 Mongo 本身并不支持 BigDecimal。我关注了 Spring 的文档 here但没有运气。

据我所知，Spring 在写入数据库时​​并没有将我的自定义转换器类注入(inject)到 Mongo 中。这是我所做的:

我的 applicationContext-services.xml...

    <!-- Factory bean that creates the Mongo instance -->
    <mongo:mongo 
        host="localhost" 
        port="1234" />

    <mongo:db-factory 
        dbname="solar" 
        mongo-ref="mongo"/>

    <mongo:mapping-converter>
      <mongo:custom-converters>
        <mongo:converter>
          <bean class="com.mine.BigDecimalReadConverter"/>
        </mongo:converter>
        <mongo:converter>
          <bean class="com.mine..BigDecimalWriteConverter"/>
        </mongo:converter>
      </mongo:custom-converters>
    </mongo:mapping-converter>

    <!-- Use this post processor to translate any MongoExceptions thrown in @Repository annotated classes -->

    <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>

<bean id="mongoDbTest"
    class="com.mine.MongoDbTest">
    <property name="mongoTemplate">
        <ref local="mongoTemplate" />
    </property> 
</bean>

我得到的错误是:

java.lang.IllegalArgumentException: Multiple constructors with arguments found in class java.math.BigDecimal! Annotate one with @PreferedConstructor explicitly to select it to be used in persistence operations.
    at org.springframework.data.mapping.PreferredConstructorDiscoverer.<init>(PreferredConstructorDiscoverer.java:81)

Answer 1

尝试使用它来支持转换器:

<bean id="mappingContext"
    class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" lazy-init="true"/>

 <bean id="defaultMongoTypeMapper"
    class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper" lazy-init="true">
    <constructor-arg name="typeKey"><null/></constructor-arg>
 </bean>

 <bean id="mappingMongoConverter"
    class="org.springframework.data.mongodb.core.convert.MappingMongoConverter" lazy-init="true" >
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
    <constructor-arg name="mappingContext" ref="mappingContext" />
    <property name="typeMapper" ref="defaultMongoTypeMapper" />
 </bean>

 <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate" lazy-init="true">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
    <constructor-arg name="mongoConverter" ref="mappingMongoConverter" />
 </bean>