springboot配置两个数据源怎么实现？

Question

springboot如何配置两个数据源呢？我的思路是这样的：
1.application.properties配置文件中先定义好两套数据源，然后定义一个DataSourceConfig类去加载两套数据源，然后再dao层调用mapper来查询的时候，分别用注解配套上不同的数据源，但是代码一直出错，请教有没有这方面的代码可以提供给参考下的，谢谢~~~

我试了下，报这个错误：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'documentationPluginsBootstrapper' defined in URL [jar:file:/E:/wacai/maven_repository/io/springfox/springfox-spring-web/2.1.2/springfox-spring-web-2.1.2.jar!/springfox/documentation/spring/web/plugins/DocumentationPluginsBootstrapper.class]: Unsatisfied dependency expressed through constructor argument with index 1 of type [springfox.documentation.spi.service.RequestHandlerProvider]: : Error creating bean with name 'webMvcRequestHandlerProvider' defined in URL [jar:file:/E:/wacai/maven_repository/io/springfox/springfox-spring-web/2.1.2/springfox-spring-web-2.1.2.jar!/springfox/documentation/spring/web/plugins/WebMvcRequestHandlerProvider.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.util.List]: : Error creating bean with name 'endpointHandlerMapping' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMapping]: Factory method 'endpointHandlerMapping' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcEndpoints' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'environmentMvcEndpoint' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.springframework.boot.actuate.endpoint.EnvironmentEndpoint]: : Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'endpointHandlerMapping' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMapping]: Factory method 'endpointHandlerMapping' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcEndpoints' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'environmentMvcEndpoint' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.springframework.boot.actuate.endpoint.EnvironmentEndpoint]: : Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'webMvcRequestHandlerProvider' defined in URL [jar:file:/E:/wacai/maven_repository/io/springfox/springfox-spring-web/2.1.2/springfox-spring-web-2.1.2.jar!/springfox/documentation/spring/web/plugins/WebMvcRequestHandlerProvider.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.util.List]: : Error creating bean with name 'endpointHandlerMapping' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMapping]: Factory method 'endpointHandlerMapping' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcEndpoints' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'environmentMvcEndpoint' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.springframework.boot.actuate.endpoint.EnvironmentEndpoint]: : Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'endpointHandlerMapping' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMapping]: Factory method 'endpointHandlerMapping' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcEndpoints' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'environmentMvcEndpoint' defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.springframework.boot.actuate.endpoint.EnvironmentEndpoint]: : Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration.healthIndicators; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.util.Map org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$DataSourcesHealthIndicatorConfiguration.dataSources; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'donghuaDataSource' defined in file [E:wacaiworkspaceData-Migrationtargetclassesspringdatabase.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to decrypt.

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springboot数据源 注解
springboot官网文档

Answer 1

a.直接配置2套数据源就像下面最EASY

@Configuration  
public class SpringConfig {  
  
    @Bean  
    public DataSource dataSource(){  
        return new XXDataSource();  
    } 
    
    @Bean
    public Counter dataSource2(){  
        return new XXDataSource();
    }  
}

b.复合数据源只读分离库实现 complexds

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"
      p:url="${jdbc.url}"
      p:username="${jdbc.username}"
      p:password="${jdbc.password}"
      p:initialSize="${druid.initialSize}"
      p:minIdle="${druid.minIdle}"
      p:maxActive="${druid.maxActive}"
      p:maxWait="${druid.maxWait}"
      p:timeBetweenEvictionRunsMillis="${druid.timeBetweenEvictionRunsMillis}"
      p:minEvictableIdleTimeMillis="${druid.minEvictableIdleTimeMillis}"
      p:validationQuery="${druid.validationQuery}"
      p:poolPreparedStatements="${druid.poolPreparedStatements}"
      p:maxPoolPreparedStatementPerConnectionSize="${druid.maxPoolPreparedStatementPerConnectionSize}"/>

<bean id="slaveDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"
      p:url="${slave.jdbc.url}"
      p:username="${slave.jdbc.username}"
      p:password="${slave.jdbc.password}"
      p:initialSize="${slave.druid.initialSize}"
      p:minIdle="${slave.druid.minIdle}"
      p:maxActive="${slave.druid.maxActive}"
      p:maxWait="${slave.druid.maxWait}"
      p:timeBetweenEvictionRunsMillis="${slave.druid.timeBetweenEvictionRunsMillis}"
      p:minEvictableIdleTimeMillis="${slave.druid.minEvictableIdleTimeMillis}"
      p:validationQuery="${slave.druid.validationQuery}"
      p:poolPreparedStatements="${slave.druid.poolPreparedStatements}"
      p:maxPoolPreparedStatementPerConnectionSize="${slave.druid.maxPoolPreparedStatementPerConnectionSize}"/>

<bean id="complexDataSource" class="com.weghst.pine.complexds.ComplexDataSource">
    <constructor-arg index="0" ref="dataSource"/>
    <constructor-arg index="1">
        <map>
            <entry key="#{T(com.weghst.pine.complexds.NamedDS).DEFAULT_SLAVE_NAME}" value-ref="slaveDataSource"/>
        </map>
    </constructor-arg>
</bean>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
      p:dataSource-ref="complexDataSource"/>

<tx:annotation-driven transaction-manager="transactionManager"/>

<!--
    MyBatis 配置
-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="complexDataSource"/>
    <property name="configurationProperties">
        <props>
            <prop key="defaultScriptingLanguage">org.mybatis.scripting.freemarker.FreeMarkerLanguageDriver</prop>
        </props>
    </property>
    <property name="mapperLocations" value="classpath*:com/weghst/pine/repository/*Mapper.xml"/>
</bean>
<bean id="sqlSessionTemplate" class="com.weghst.pine.util.FastSqlSessionTemplate"
      c:sqlSessionFactory-ref="sqlSessionFactory"/>
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.weghst.pine.repository"/>
    <property name="annotationClass" value="org.springframework.stereotype.Repository"/>
    <property name="sqlSessionTemplateBeanName" value="sqlSessionTemplate"/>
</bean>

<bean id="complexDataSourceInterceptor" class="com.weghst.pine.complexds.ComplexDataSourceInterceptor"/>
<aop:config>
    <aop:aspect ref="complexDataSourceInterceptor">
        <aop:around method="invoke" pointcut="execution(* com.weghst.pine.repository.*.*(..))"/>
    </aop:aspect>
</aop:config>

其实实现原理就是配置多不同的数据源将其集中在ComplexDS中用名字区别，在Repository的方法中使用@NamedDS指定数据源，在MyBatis获取Connection的时候利用AOP自动根据不同的数据源返回不同的Connection。
ComplexDataSource: ComplexDataSource.java
Spring AOP: ComplexDataSourceInterceptor.java

使用:

@NamedDS
List<Config> findAll();