springboot为什么使用exclude注解？什么是多数据源？

为什么使用exclude注解？

 什么是双（多）数据源？

 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"
       >
 
    <import resource="classpath*:/test1-core-spring/test1-datasource.xml"/>
 
    <context:component-scan base-package="com.yunpeng.core.test1">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:exclude-filter type="annotation"
                                expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
    </context:component-scan>
    
    //这里扫码第二套数据源相关的业务类
    <context:component-scan base-package="com.yunpeng.core.test2"/>
    //这里加载第二套数据源相关的数据源配置
    <import resource="classpath*:test2-core-spring/test2-core-dao.xml"/>
 
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
 
    <bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
        <property name="transactionManager" ref="transactionManager"/>
    </bean>
 
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>
 
    <!-- 使用 annotation 定义事务 -->
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
 
    <!-- MyBatis 配置 -->
    //重点这里已经有了一个名字叫sqlSessionFactory的bean了,并且只扫描了        
    //com.yunpeng.core.test1.dao下面的接口，如果当前文件引入的第二套中也有一个叫        
    //sqlSessionFactory的bean,会把第二套中的覆盖掉，于是只剩下了第一套的
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="typeAliasesPackage"
                  value="com.yunpeng.core.test1.entity,com.yunpeng.core.test1.enumtype"/>
        <property name="mapperLocations" value="classpath:/test1-process-mapper/*Mapper.xml"/>
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage"
                  value="com.yunpeng.core.test1.dao"/>
        <property name="annotationClass" value="org.springframework.stereotype.Repository"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
 
</beans>

这是第二套数据源的相关配置，重点是sqlSessionFactory这个bean一定不要和第一个的重复。

<?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:jdbc="http://www.springframework.org/schema/jdbc" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"
       default-autowire="byName">
 
    <import resource="classpath*:/test2-core-spring/test2-core-datasource.xml"/>
 
    <bean id="txManagerTest2" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="test2DS" />
        <property name="nestedTransactionAllowed" value="true"></property>
    </bean>
 
    <tx:annotation-driven transaction-manager="txManagerTest2" proxy-target-class="true" />
 
    <bean id="transactionTemplateTest2" class="org.springframework.transaction.support.TransactionTemplate">
        <property name="transactionManager" ref="txManagerTest2" />
    </bean>
 
    <bean id="jdbcTemplateTest2" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="test2DS" />
    </bean>
    
    //这里的bean一定要与数据源一中的区别开来，否则会被第一套覆盖，这是我加了Test2区分
    <bean id="sqlSessionFactoryTest2" class="com.yeepay.g3.utils.persistence.mybatis.SqlSessionFactoryBeanWapper">
        <property name="dataSource" ref="test2DS" />
        <property name="configLocation" value="classpath:/mybatis/mybatis-config.xml" />
        <property name="mapperLocations" value="classpath*:test2-core-mapper/*.xml" />
    </bean>
 
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.yunpeng.core.test2.dao" />
        <property name="annotationClass" value="org.springframework.stereotype.Repository" />
        <property name="sqlSessionFactory" ref="sqlSessionFactoryTest2" />
    </bean>
</beans>