import java.lang.annotation.ElementType; 
import java.lang.annotation.Target; 
import java.lang.annotation.Retention; 
import java.lang.annotation.RetentionPolicy; 
/** 
 * RUNTIME 
 * 编译器将把注释记录在类文件中，在运行时 VM 将保留注释，因此可以反射性地读取。 
 * @author yangGuang 
 * 
 */ 
@Retention(RetentionPolicy.RUNTIME) 
@Target(ElementType.METHOD) 
public @interface DataSource { 
  String value(); 
} 

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 
 
 public class ChooseDataSource extends AbstractRoutingDataSource { 
 
   @Override 
   protected Object determineCurrentLookupKey() { 
     return HandleDataSource.getDataSource(); 
   } 
    
 } 

public class HandleDataSource { 
  public static final ThreadLocal<String> holder = new ThreadLocal<String>(); 
  public static void putDataSource(String datasource) { 
    holder.set(datasource); 
  } 
   
  public static String getDataSource() { 
    return holder.get(); 
  }   
} 

import java.lang.reflect.Method; 
import org.aspectj.lang.JoinPoint; 
import org.aspectj.lang.annotation.Aspect; 
import org.aspectj.lang.annotation.Before; 
import org.aspectj.lang.annotation.Pointcut; 
import org.aspectj.lang.reflect.MethodSignature; 
import org.springframework.stereotype.Component; 
//@Aspect 
//@Component 
public class DataSourceAspect { 
  //@Pointcut("execution(* com.apc.cms.service.*.*(..))")  
  public void pointCut(){};  
   
 // @Before(value = "pointCut()") 
   public void before(JoinPoint point) 
    { 
      Object target = point.getTarget(); 
      System.out.println(target.toString()); 
      String method = point.getSignature().getName(); 
      System.out.println(method); 
      Class<?>[] classz = target.getClass().getInterfaces(); 
      Class<?>[] parameterTypes = ((MethodSignature) point.getSignature()) 
          .getMethod().getParameterTypes(); 
      try { 
        Method m = classz[0].getMethod(method, parameterTypes); 
        System.out.println(m.getName()); 
        if (m != null && m.isAnnotationPresent(DataSource.class)) { 
          DataSource data = m.getAnnotation(DataSource.class); 
          HandleDataSource.putDataSource(data.value()); 
        } 
         
      } catch (Exception e) { 
        e.printStackTrace(); 
      } 
    } 
} 

<!-- 主库数据源 --> 
 <bean id="writeDataSource" class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"> 
  <property name="driverClass" value="com.mysql.jdbc.Driver"/> 
  <property name="jdbcUrl" value="jdbc:mysql://172.22.14.6:3306/cpp?autoReconnect=true"/> 
  <property name="username" value="root"/> 
  <property name="password" value="root"/> 
  <property name="partitionCount" value="4"/> 
  <property name="releaseHelperThreads" value="3"/> 
  <property name="acquireIncrement" value="2"/> 
  <property name="maxConnectionsPerPartition" value="40"/> 
  <property name="minConnectionsPerPartition" value="20"/> 
  <property name="idleMaxAgeInSeconds" value="60"/> 
  <property name="idleConnectionTestPeriodInSeconds" value="60"/> 
  <property name="poolAvailabilityThreshold" value="5"/> 
</bean> 
 
<!-- 从库数据源 --> 
<bean id="readDataSource" class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"> 
  <property name="driverClass" value="com.mysql.jdbc.Driver"/> 
  <property name="jdbcUrl" value="jdbc:mysql://172.22.14.7:3306/cpp?autoReconnect=true"/> 
  <property name="username" value="root"/> 
  <property name="password" value="root"/> 
  <property name="partitionCount" value="4"/> 
  <property name="releaseHelperThreads" value="3"/> 
  <property name="acquireIncrement" value="2"/> 
  <property name="maxConnectionsPerPartition" value="40"/> 
  <property name="minConnectionsPerPartition" value="20"/> 
  <property name="idleMaxAgeInSeconds" value="60"/> 
  <property name="idleConnectionTestPeriodInSeconds" value="60"/> 
  <property name="poolAvailabilityThreshold" value="5"/> 
</bean> 
 
<!-- transaction manager, 事务管理 --> 
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> 
  <property name="dataSource" ref="dataSource" /> 
</bean> 
 
 
<!-- 注解自动载入 --> 
<context:annotation-config /> 
 
<!--enale component scanning (beware that this does not enable mapper scanning!)--> 
<context:component-scan base-package="com.apc.cms.persistence.rdbms" /> 
<context:component-scan base-package="com.apc.cms.service"> 
 <context:include-filter type="annotation"  
    expression="org.springframework.stereotype.Component" />  
</context:component-scan>  
 
<context:component-scan base-package="com.apc.cms.auth" /> 
 
<!-- enable transaction demarcation with annotations --> 
<tx:annotation-driven /> 
 
 
<!-- define the SqlSessionFactory --> 
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> 
  <property name="dataSource" ref="dataSource" /> 
  <property name="typeAliasesPackage" value="com.apc.cms.model.domain" /> 
</bean> 
 
<!-- scan for mappers and let them be autowired --> 
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 
  <property name="basePackage" value="com.apc.cms.persistence" /> 
  <property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
</bean> 
 
<bean id="dataSource" class="com.apc.cms.utils.ChooseDataSource"> 
  <property name="targetDataSources">  
     <map key-type="java.lang.String">  
       <!-- write --> 
       <entry key="write" value-ref="writeDataSource"/>  
       <!-- read --> 
       <entry key="read" value-ref="readDataSource"/>  
     </map>  
      
  </property>  
  <property name="defaultTargetDataSource" ref="writeDataSource"/>  
</bean> 
  
<!-- 激活自动代理功能 --> 
<aop:aspectj-autoproxy proxy-target-class="true"/> 
 
<!-- 配置数据库注解aop --> 
<bean id="dataSourceAspect" class="com.apc.cms.utils.DataSourceAspect" /> 
<aop:config> 
  <aop:aspect id="c" ref="dataSourceAspect"> 
    <aop:pointcut id="tx" expression="execution(* com.apc.cms.service..*.*(..))"/> 
    <aop:before pointcut-ref="tx" method="before"/> 
  </aop:aspect> 
</aop:config> 
<!-- 配置数据库注解aop --> 

@DataSource("write") 
public void update(User user) { 
  userMapper.update(user); 
} 
 
@DataSource("read") 
public Document getDocById(long id) { 
  return documentMapper.getById(id); 
} 

<repository> 
   <id>nexus</id> 
   <name>nexus</name> 
   <url>http://repository.sonatype.org/content/groups/public/</url> 
   <layout>default</layout> 
 </repository> 

  <dependency> 
    <groupId>aspectj</groupId> 
    <artifactId>aspectjrt</artifactId> 
    <version>1.5.4</version> 
</dependency> 
<dependency> 
    <groupId>aspectj</groupId> 
    <artifactId>aspectjweaver</artifactId> 
    <version>1.5.4</version> 
lt;/dependency>