ssm多數據源——註解方式

<?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:tx="http://www.springframework.org/schema/tx"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx-4.0.xsd 
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-4.0.xsd ">

    <!-- 配置數據源  --> 
    <bean name="datasource" class="com.alibaba.druid.pool.DruidDataSource"  
        init-method="init" destroy-method="close">  
        <property name="url" value="${jdbc.urlmaster}" />  
        <property name="username" value="${jdbc.username}" />  
        <property name="password" value="${jdbc.password}" />  
    </bean>  
  
    <!-- 配置數據源1   -->
    <bean name="datasource1" class="com.alibaba.druid.pool.DruidDataSource"  
        init-method="init" destroy-method="close">  
        <property name="url" value="${jdbc.urlslave}" />  
        <property name="username" value="${jdbc.username}" />  
        <property name="password" value="${jdbc.password}" />  
    </bean>  
  
    <bean id="multipleDataSource" class="pers.aidenj.ostrich.common.DataSource.DynamicDataSource">  
        <property name="targetDataSources">  
            <map>  
                <entry key="datasource" value-ref="datasource"/>  
                <entry key="datasource1" value-ref="datasource1"/>  
            </map>  
        </property>  
        <property name="defaultTargetDataSource" ref="datasource"/>  <!-- 默認數據源 -->
    </bean>  
      
    <!-- 配置sqlSessionFactory 並讀取mybatis的一些配置 -->  
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  
        <property name="dataSource" ref="multipleDataSource"></property>  
        <property name="mapperLocations" value="classpath:pers/aidenj/ostrich/mapping/*.xml" />
    </bean>  
  
   <!--  自動掃描 將Mapper接口生成代理注入到Spring -->  
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
        <property name="basePackage" value="pers.aidenj.ostrich.mapper" />  
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />  
    </bean>  
  
    <!-- 配置事物   -->
    <bean id="transactionManager"  
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
        <property name="dataSource" ref="multipleDataSource"></property>  
    </bean>  
  
    <tx:annotation-driven transaction-manager = "transactionManager"/>  
  
    <!-- 事物的具體內容   -->
    <tx:advice id="transactionAdvice" transaction-manager="transactionManager">  
        <tx:attributes>  
            <tx:method name="add*" propagation="REQUIRED" />  
            <tx:method name="append*" propagation="REQUIRED" />  
            <tx:method name="insert*" propagation="REQUIRED" />  
            <tx:method name="save*" propagation="REQUIRED" />  
            <tx:method name="update*" propagation="REQUIRED" />  
            <tx:method name="modify*" propagation="REQUIRED" />  
            <tx:method name="edit*" propagation="REQUIRED" />  
            <tx:method name="delete*" propagation="REQUIRED" />  
            <tx:method name="remove*" propagation="REQUIRED" />  
            <tx:method name="repair" propagation="REQUIRED" />  
            <tx:method name="delAndRepair" propagation="REQUIRED" />  
  
  
            <tx:method name="get*" propagation="SUPPORTS" />  
            <tx:method name="find*" propagation="SUPPORTS" />  
            <tx:method name="load*" propagation="SUPPORTS" />  
            <tx:method name="search*" propagation="SUPPORTS" />  
            <tx:method name="datagrid*" propagation="SUPPORTS" />  
  
  
            <tx:method name="*" propagation="SUPPORTS" />  
        </tx:attributes>  
    </tx:advice>
	
	<!-- 爲業務邏輯層的方法解析@DataSource註解  爲當前線程的routeholder注入數據源key -->   
	<bean id="dataSourceAspect" class="pers.aidenj.ostrich.common.aop.DataSourceAspect" />    
	<aop:config proxy-target-class="true">
		<!-- 定義一個切面 -->
	    <aop:aspect id="dataSourceAspect" ref="dataSourceAspect" order="1">    
	        <!-- 定義一個切點 -->
	        <aop:pointcut id="dataSourcePointcut" expression="execution(* pers.aidenj.ostrich.service.*.*(..)) "/>    
	        <!-- 前通知 -->
	        <!-- <aop:before pointcut-ref="dataSourcePointcut" method="before" /> -->             
	        <aop:before pointcut-ref="dataSourcePointcut" method="intercept" />                
	    </aop:aspect>    
	</aop:config>
 
</beans>

package pers.aidenj.ostrich.common.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface DataSource {
	 String value();
}

package pers.aidenj.ostrich.common.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.reflect.MethodSignature;

import java.lang.reflect.Method;


import pers.aidenj.ostrich.common.DataSource.DynamicDataSourceHolder;
import pers.aidenj.ostrich.common.annotation.DataSource;

public class DataSourceAspect {

    /**
     * 攔截目標方法，獲取由@DataSource指定的數據源標識，設置到線程存儲中以便切換數據源
     * 
     * @param point
     * @throws Exception
     */
    public void intercept(JoinPoint point) throws Exception {
        Class<?> target = point.getTarget().getClass();
        MethodSignature signature = (MethodSignature) point.getSignature();
        // 默認使用目標類型的註解，若是沒有則使用其實現接口的註解
        signature.getMethod().getParameterTypes();
        for (Class<?> clazz : target.getInterfaces()) {
            resolveDataSource(clazz, signature.getMethod());
        }
        resolveDataSource(target, signature.getMethod());
    }

    /**
     * 提取目標對象方法註解和類型註解中的數據源標識
     * 
     * @param clazz
     * @param method
     */
    private void resolveDataSource(Class<?> clazz, Method method) {
        try {
            Class<?>[] types = method.getParameterTypes();
            // 默認使用類型註解
            if (clazz.isAnnotationPresent(DataSource.class)) {
                DataSource source = clazz.getAnnotation(DataSource.class);
                DynamicDataSourceHolder.setDataSource(source.value());
            }
            // 方法註解能夠覆蓋類型註解
            Method m = clazz.getMethod(method.getName(), types);
            if (m != null && m.isAnnotationPresent(DataSource.class)) {
                DataSource source = m.getAnnotation(DataSource.class);
                DynamicDataSourceHolder.setDataSource(source.value());
            }
        } catch (Exception e) {
            System.out.println(clazz + ":" + e.getMessage());
        }
    }

}

package pers.aidenj.ostrich.serviceImpl;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import pers.aidenj.ostrich.common.DataSource.DynamicDataSourceHolder;
import pers.aidenj.ostrich.common.annotation.DataSource;
import pers.aidenj.ostrich.mapper.DictionaryMapper;
import pers.aidenj.ostrich.model.Dictionary;
import pers.aidenj.ostrich.service.DictionaryService;

@Service("dictionaryService")
public class DictionaryServiceImpl implements DictionaryService {

	@Resource
	DictionaryMapper dictionaryMapper;
	
	@Override
	public boolean getOneData() {
		// TODO Auto-generated method stub
		return true;
	}

	//沒有指定庫，使用默認
	@Override
	public List<Dictionary> getAllDictionary() {
		// TODO Auto-generated method stub
		return dictionaryMapper.getAllDictionary();
	}

	//指定master
	@Override
	@DataSource("datasource")
	public List<Dictionary> getAllDictionaryMasterDataSource() {
		// TODO Auto-generated method stub
		return dictionaryMapper.getAllDictionary();
	}

	//指定master
	@Override
	public List<Dictionary> getAllDictionaryMaster() {
		// TODO Auto-generated method stub
		DynamicDataSourceHolder.setDataSource("datasource");
		return dictionaryMapper.getAllDictionary();
	}
	
	//指定slave
	@Override
	@DataSource("datasource1")
	public List<Dictionary> getAllDictionarySlaveDataSource() {
		// TODO Auto-generated method stub
		return dictionaryMapper.getAllDictionary();
	}
	//指定slave
	@Override
	public List<Dictionary> getAllDictionarySlave() {
		// TODO Auto-generated method stub
		DynamicDataSourceHolder.setDataSource("datasource1");
		return dictionaryMapper.getAllDictionary();
	}


}