Spring Mybatis 多数据源配置（AspectJ 注解方式）的一些问题

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1、db.properties文件的配置

	jdbc.dataSourceOne.driver=com.mysql.jdbc.Driver
	jdbc.dataSourceOne.url=jdbc:mysql://localhost:3306/test
	jdbc.dataSourceOne.username=root
	jdbc.dataSourceOne.password=123456

	jdbc.dataSourceTwo.driver=com.mysql.jdbc.Driver
	jdbc.dataSourceTwo.url=jdbc:mysql://localhost:3306/testtwo
	jdbc.dataSourceTwo.username=root
	jdbc.dataSourceTwo.password=123456

2、数据源的配置即applicationContext.xml的配置

<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
   destroy-method="close">
   <property name="driverClassName" value="${jdbc.dataSourceOne.driver}" />
   <property name="url" value="${jdbc.dataSourceOne.url}" />
   <property name="username" value="${jdbc.dataSourceOne.username}" />
   <property name="password" value="${jdbc.dataSourceOne.password}" />
   <property name="maxActive" value="10" />
   <property name="maxIdle" value="5" />
</bean>

<bean id="dataSourceTwo" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" >
   <property name="driverClassName" value="${jdbc.dataSourceTwo.driver}" />
   <property name="url" value="${jdbc.dataSourceTwo.url}" />
   <property name="username" value="${jdbc.dataSourceTwo.username}" />
   <property name="password" value="${jdbc.dataSourceTwo.password}" />
   <property name="maxActive" value="10" />
   <property name="maxIdle" value="5" />
</bean>
<!--

common.mutipleDataSource.MutipleDataSource 自己编写的类 下面会给出实现

--> < bean id ="multipleDataSource" class ="common.mutipleDataSource.MutipleDataSource" > < property name ="defaultTargetDataSource" ref ="dataSourceTwo" /> < property name ="targetDataSources" > < map > < entry key ="dataSource" value-ref ="dataSource" /> < entry key ="dataSourceTwo" value-ref ="dataSourceTwo" /> </ map > </ property > </ bean > <!-- SqlsessionFactory --> < bean id ="sqlSessionFactory" class ="org.mybatis.spring.SqlSessionFactoryBean" > <!-- 数据源 --> < property name ="dataSource" ref ="multipleDataSource" /> <!-- mybatis配置文件 --> < property name ="configLocation" value ="classpath:mybatis/SqlMapConfig.xml" /> < property name ="mapperLocations" value ="classpath:mapping/*.xml" ></ property > <!--配置pojo包下的pojo类的别名 别名为：pojo类名的首字母大写或者小写--> < property name ="typeAliasesPackage" value ="pojo" /> </ bean > <!-- MapperScannerConfigurer：mapper的扫描器，将包下边的mapper接口自动创建代理对象， 自动创建到spring容器中，bean的id是mapper的类名（首字母小写） --> < bean class ="org.mybatis.spring.mapper.MapperScannerConfigurer" > < property name ="basePackage" value ="dao" /> <!-- 使用sqlSessionFactoryBeanName --> < property name ="sqlSessionFactoryBeanName" value ="sqlSessionFactory" /> </ bean >

<!-- 使用自动代理扫描器 即使用注解 AspectJ  

common.multipleDataSourceAspectAdvice 自定义类 后面会给出具体实现
-->

<context:component-scan base-package="common.multipleDataSourceAspectAdvice" />
   <aop:aspectj-autoproxy />

3、common.mutipleDataSource.MutipleDataSource类的实现

public class MutipleDataSource extends AbstractRoutingDataSource {
    private static final ThreadLocal<String> dataSourceKey = new Inheritabl	eThreadLocal<String>();

    public static void setDataSourceKey(String dataSource) {
        dataSourceKey.set(dataSource);
    }

    @Override
    protected Object determineCurrentLookupKey() {
        return dataSourceKey.get();
    }
}

4、 common.multipleDataSourceAspectAdvice 类的实现

@Component
@Aspect 
public class MultipleDataSourceAspectAdvice  {
    @Around("execution(* dao.*.*(..))")//切入点选择在Dao层，之前选择了在service层出现了不能自动切换的情况，修改后正常使用
    public Object doAround(ProceedingJoinPoint jp) throws Throwable {
        Object obj = jp.getTarget();
        boolean flag = jp.getTarget() instanceof UserMapper;
        boolean flagTwo = jp.getTarget() instanceof UserMapperTwo;
        if (jp.getTarget() instanceof UserMapper) {
            MutipleDataSource.setDataSourceKey("dataSource");
        } else if (jp.getTarget() instanceof UserMapperTwo) {
            MutipleDataSource.setDataSourceKey("dataSourceTwo");
        }
        return jp.proceed();
    }
}