springMVC多数据源使用 跨库跨连接

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有的时候项目中可能要从另外一个系统取数据  如果另外一个系统能提供接口就很好解决 如果没有接口 便可以配置多个数据源切换访问

<1>:这是数据源和事务扫描注入的配置 访问多个数据源只需要建立多个数据源和事务这一套配置文件

这是第一个数据源

<?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:jee="http://www.springframework.org/schema/jee"
	xmlns:tx="http://www.springframework.org/schema/tx" 
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"
	default-lazy-init="true">

	<description>Spring公共配置 </description>
	
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:resources.properties</value>
                <!--  <value>classpath:memcached.properties</value> -->
            </list>
        </property>
    </bean>
    
    <!-- dubbo配置 -->
    <!-- <dubbo:application name="xaUserRegPro" />
    <dubbo:registry address="multicast://" />
    <dubbo:reference id="userRegProService" interface="com.xinnet.xa.service.UserRegProService"  timeout="6000"/> -->
    
 <!-- **************** druid 监控连接池配置 ***************** -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
		
		<!-- 基本属性 url、user、password -->
		<property name="url" value="${url}" />
		<property name="username" value="${username}" />
		<property name="password" value="${password}" />
		
		<!-- 配置初始化大小、最小、最大 -->
		<property name="initialSize" value="${initialSize}" />
		<property name="minIdle" value="${minIdle}" />
		<property name="maxActive" value="${maxActive}" />
		
		<!-- 配置获取连接等待超时的时间 -->
		<property name="maxWait" value="${maxWait}" />
		
		<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
		<property name="timeBetweenEvictionRunsMillis" value="60000" />
		
		<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
		<property name="minEvictableIdleTimeMillis" value="300000" />
		<property name="validationQuery" value="SELECT 'x'" />
		<property name="testWhileIdle" value="true" />
		<property name="testOnBorrow" value="false" />
		<property name="testOnReturn" value="false" />
		
		<!-- 打开PSCache，并且指定每个连接上PSCache的大小  -->
		<!-- 如果用Oracle，则把poolPreparedStatements配置为true，mysql可以配置为false。分库分表较多的数据库，建议配置为false -->
		<property name="poolPreparedStatements" value="${poolPreparedStatements}" />
		<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
		
		<!-- 对泄漏的连接 自动关闭 -->
		<property name="removeAbandoned" value="${removeAbandoned}" /> <!-- 打开removeAbandoned功能 -->
   		<property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" /> <!-- 1800秒，也就是30分钟 -->
        <property name="logAbandoned" value="${logAbandoned}" /> <!-- 关闭abanded连接时输出错误日志 -->
        
		<!-- 配置监控统计拦截的filters -->
		<property name="filters" value="mergeStat" />
		<!--  <property name="filters" value="stat" /> -->
		<!-- 慢日志查询  缺省为3秒  修改为10秒 10000 -->
		<property name="connectionProperties" value="druid.stat.slowSqlMillis=5000" />
		
		<!-- DruidDataSource各自独立 ， 支持配置公用监控数据 -->
		<!-- <property name="useGloalDataSourceStat" value="true" /> -->
	</bean>
	
	<!-- druid 监控  spring  -->
	<bean id="druid-stat-interceptor" class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor"/>
	<bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut" scope="prototype">
		<property name="patterns">
			<list>
				<value>com.xinnet.*.service.*</value>
			</list>
		</property>
	</bean>
	<aop:config>
		<aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut" />
	</aop:config>
	
	<!-- MyBatis Mapper.XMl 配置 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
	    <property name="configLocation" value="classpath:config/mybatis.xml" />
	    <property name="mapperLocations">
			<list>
			<!-- 自动匹配Mapper映射文件  -->
				<value>classpath:mapper/**/*-mapper.xml</value>
			</list>
		</property>
		<!-- 添加插件 -->
        <property name="plugins">
	    	<array>
				<ref bean="pagePlugin" />
			</array>
	    </property>
	</bean>
	
	<!-- 支持文件上传相关 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
	
	<!-- 分页插件，根据方言自动添加分页信息，默认要求 -->
	<bean id="pagePlugin" class="com.xinnet.core.mybatis.plugin.PagePlugin">
		<property name="properties">
			<props>
				<prop key="dialect">com.xinnet.core.mybatis.dialet.MySQLDialect</prop>
				<prop key="pageSqlId">.*query.*</prop>
			</props>
		</property>
	</bean>
	<!-- redis客户端 -->
	 <!-- jedis pool配置  -->  
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">  
        <property name="maxActive" value="${redis.maxActive}" />  
        <property name="maxIdle" value="${redis.maxIdle}" />  
        <property name="maxWait" value="${redis.maxWait}" />  
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />  
    </bean>  
    
    <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">  
        <property name="usePool" value="true"></property>  
        <property name="hostName" value="${redis.host}" />  
        <property name="port" value="${redis.port}" />  
        <property name="password" value="${redis.pass}" />  
        <property name="timeout" value="${redis.timeout}" />  
        <property name="database" value="${redis.default.db}"></property>  
        <constructor-arg index="0" ref="jedisPoolConfig" />  
    </bean>  
	<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">  
        <property name="connectionFactory" ref="jedisConnectionFactory" />  
    </bean>
   
    <!-- ***************事务配置************** -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource" />
	</bean>
  	<aop:config>  
             <aop:advisor pointcut="execution(* com.xinnet..service..*.*(..))"  advice-ref="txAdvice" />  
    </aop:config>  
    <tx:advice id="txAdvice" transaction-manager="transactionManager">  
        <tx:attributes>  
            <tx:method name="get*" read-only="true" />  
            <tx:method name="query*" read-only="true" />  
            <tx:method name="find*" read-only="true" />  
            <tx:method name="load*" read-only="true" />
            <tx:method name="select*" read-only="true" /> 
            <tx:method name="count*" read-only="true" />  
            <tx:method name="search*" read-only="true" />  
            <tx:method name="list*" read-only="true" />  
            <tx:method name="*" propagation="REQUIRED" rollback-for="Exception" />  
        </tx:attributes>  
    </tx:advice>  
    <aop:aspectj-autoproxy proxy-target-class="true"/>  
    <!-- 开启注解事务 只对当前配置文件有效 -->
  	
    <!-- 扫描注解Bean -->
    <context:component-scan base-package="com.xinnet">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>  
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
     <!-- 隐式地向 Spring 容器注册 -->
	<context:annotation-config/> 
	
</beans>

<2>这是第二个数据源 和第一个数据源一样 需要有事务 扫描注解
 不同的是数据源的 url  username 和password 用的是第二个数据源的连接  用户名和密码

<?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:jee="http://www.springframework.org/schema/jee"
	xmlns:tx="http://www.springframework.org/schema/tx" 
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd"
	default-lazy-init="true">

	<description>Spring公共配置 </description>
	
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:resources.properties</value>
                <!--  <value>classpath:memcached.properties</value> -->
            </list>
        </property>
    </bean>
    
 <!-- **************** druid 监控连接池配置 *****************  -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
		
		<!-- 基本属性 url、user、password -->
		<property name="url" value="${url2}" />
		<property name="username" value="${username2}" />
		<property name="password" value="${password2}" />
		
		<!-- 配置初始化大小、最小、最大 -->
		<property name="initialSize" value="${initialSize}" />
		<property name="minIdle" value="${minIdle}" />
		<property name="maxActive" value="${maxActive}" />
		
		<!-- 配置获取连接等待超时的时间 -->
		<property name="maxWait" value="${maxWait}" />
		
		<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
		<property name="timeBetweenEvictionRunsMillis" value="60000" />
		
		<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
		<property name="minEvictableIdleTimeMillis" value="300000" />
		<property name="validationQuery" value="SELECT 'x'" />
		<property name="testWhileIdle" value="true" />
		<property name="testOnBorrow" value="false" />
		<property name="testOnReturn" value="false" />
		
		<!-- 打开PSCache，并且指定每个连接上PSCache的大小  -->
		<!-- 如果用Oracle，则把poolPreparedStatements配置为true，mysql可以配置为false。分库分表较多的数据库，建议配置为false -->
		<property name="poolPreparedStatements" value="${poolPreparedStatements}" />
		<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
		
		<!-- 对泄漏的连接 自动关闭 -->
		<property name="removeAbandoned" value="${removeAbandoned}" /> <!-- 打开removeAbandoned功能 -->
   		<property name="removeAbandonedTimeout" value="${removeAbandonedTimeout}" /> <!-- 1800秒，也就是30分钟 -->
        <property name="logAbandoned" value="${logAbandoned}" /> <!-- 关闭abanded连接时输出错误日志 -->
        
		<!-- 配置监控统计拦截的filters -->
		<property name="filters" value="mergeStat" />
		<!--  <property name="filters" value="stat" /> -->
		<!-- 慢日志查询  缺省为3秒  修改为10秒 10000 -->
		<property name="connectionProperties" value="druid.stat.slowSqlMillis=5000" />
		
		<!-- DruidDataSource各自独立 ， 支持配置公用监控数据 -->
		<!-- <property name="useGloalDataSourceStat" value="true" /> -->
	</bean>
	
	<!-- druid 监控  spring  -->
	<bean id="druid-stat-interceptor" class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor"/>
	<bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut" scope="prototype">
		<property name="patterns">
			<list>
				<value>com.xinnet.*.service.*</value>
			</list>
		</property>
	</bean>
	<aop:config>
		<aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut" />
	</aop:config>
	
	<!-- MyBatis Mapper.XMl 配置 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
	    <property name="configLocation" value="classpath:config/mybatis.xml" />
	    <property name="mapperLocations">
			<list>
			<!-- 自动匹配Mapper映射文件  -->
				<value>classpath:mapper/**/*-mapper.xml</value>
			</list>
		</property>
		<!-- 添加插件 -->
        <property name="plugins">
	    	<array>
				<ref bean="pagePlugin" />
			</array>
	    </property>
	</bean>
	
	<!-- 支持文件上传相关 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
	
	<!-- 分页插件，根据方言自动添加分页信息，默认要求 -->
	<bean id="pagePlugin" class="com.xinnet.core.mybatis.plugin.PagePlugin">
		<property name="properties">
			<props>
				<prop key="dialect">com.xinnet.core.mybatis.dialet.MySQLDialect</prop>
				<prop key="pageSqlId">.*query.*</prop>
			</props>
		</property>
	</bean>
	<!-- redis客户端 -->
	 <!-- jedis pool配置  -->  
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">  
        <property name="maxActive" value="${redis.maxActive}" />  
        <property name="maxIdle" value="${redis.maxIdle}" />  
        <property name="maxWait" value="${redis.maxWait}" />  
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />  
    </bean>  
    
    <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">  
        <property name="usePool" value="true"></property>  
        <property name="hostName" value="${redis.host}" />  
        <property name="port" value="${redis.port}" />  
        <property name="password" value="${redis.pass}" />  
        <property name="timeout" value="${redis.timeout}" />  
        <property name="database" value="${redis.default.db}"></property>  
        <constructor-arg index="0" ref="jedisPoolConfig" />  
    </bean>  
	<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">  
        <property name="connectionFactory" ref="jedisConnectionFactory" />  
    </bean>
   
    <!-- ***************事务配置************** -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource" />
	</bean>
  	<aop:config>  
             <aop:advisor pointcut="execution(* com.xinnet..service..*.*(..))"  advice-ref="txAdvice" />  
    </aop:config>  
    <tx:advice id="txAdvice" transaction-manager="transactionManager">  
        <tx:attributes>  
            <tx:method name="get*" read-only="true" />  
            <tx:method name="query*" read-only="true" />  
            <tx:method name="find*" read-only="true" />  
            <tx:method name="load*" read-only="true" />
            <tx:method name="select*" read-only="true" /> 
            <tx:method name="count*" read-only="true" />  
            <tx:method name="search*" read-only="true" />  
            <tx:method name="list*" read-only="true" />  
            <tx:method name="*" propagation="REQUIRED" rollback-for="Exception" />  
        </tx:attributes>  
    </tx:advice>  
    <aop:aspectj-autoproxy proxy-target-class="true"/>  
    <!-- 开启注解事务 只对当前配置文件有效 -->
  	
    <!-- 扫描注解Bean -->
    <context:component-scan base-package="com.xinnet">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository"/>  
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
     <!-- 隐式地向 Spring 容器注册 -->
	<context:annotation-config/> 
	
</beans>

<3>这个时候就可以用两个数据源进行切换注入 从而使用不同数据源的service

这是service里面的方法 该怎么写就是怎么写 该怎么注解就怎么注解 不用做特殊的步骤 

@Service("partyService")
public class PartyServiceImpl implements PartyService {

	@Autowired
	private PartyDao partyDao;
	
	@Override
	public List<Emp> getAllEmp() throws SQLException {
		return partyDao.getAllEmp();
	}

}

Dao层也是一样 该怎么写就怎么写 该怎么注解就怎么注解

然后可以写一个测试类试一下连接

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:spring.xml" })//这里的spring.xml加载了第一个数据源 spring-commons.xml 
public class DataSourceTest extends AbstractTransactionalJUnit4SpringContextTests {
	/**
	 * 
	 * 功能描述：xxxxx
	 *
	 * @throws SQLException
	 *
	 * @author xxx[[email protected]]
	 *
	 * @since 2014年3月12日
	 *
	 * @update:[变更日期YYYY-MM-DD][更改人姓名][变更描述]
	 */
	@Test
	@Rollback(true)
	public void testGetAllEmp() throws SQLException {
		ApplicationContext ac = new FileSystemXmlApplicationContext("classpath:config/hymanager/hymanager_spring.xml");//这里加载的是第二个数据源配置文件路径 使用的时候用application 读取第二个数据源的配置文件 就可以用getBean 获取注入的service 不用ac.getBean 用@Autowired自动注入的 则使用的是第一个数据源  
		PartyService partyService = (PartyService) ac.getBean("partyService");
		List<Emp> list = partyService.getAllEmp();
		for (Emp emp : list) {
			System.out.println(emp.getEmpno());
		}
	}

这样就可以封装一个父类

public class DataSourceChange {
	//第二个数据源数据源
	public ApplicationContext otherDataSource=new FileSystemXmlApplicationContext("classpath:config/hymanager/hymanager_spring.xml");
	//默认数据源
	public ApplicationContext defaultDataSource=new FileSystemXmlApplicationContext("classpath:config/spring_commons.xml");
	/**
	 * 
	 * 功能描述：xxxx
	 *
	 * @param beanName
	 * @return
	 *
	 * @author xxx[[email protected]]
	 *
	 * @since 2014年3月12日
	 *
	 * @update:[变更日期YYYY-MM-DD][更改人姓名][变更描述]
	 */
	public Object now(String beanName) {
		return defaultDataSource.getBean(beanName);
	}
	public Object after(String beanName) {
		return otherDataSource.getBean(beanName);
	}
}

要使用多个数据源的类就可以继承这个父类

public class HyMangerEmpDataHandle extends DataSourceChange {
	//用父类的after方法更换配置切换第二套数据源获取注入partyService
	private PartyService partyService=(PartyService) after("partyService");
	
	//用父类的now方法更换配置切换第一套数据源获取注入empService
	private EmpService empService=(EmpService) now("empService");
	
	private static Logger log=LoggerFactory.getLogger(PartyService.class);
	/**
	 * 
	 * 功能描述：xxxxx
	 *
	 * @throws SQLException
	 *
	 * @author xxx[[email protected]]
	 *
	 * @since 2014年3月12日
	 *
	 * @update:[变更日期YYYY-MM-DD][更改人姓名][变更描述]
	 */
	public void leadingAllEmp() throws SQLException {
		List<Emp> partyList=partyService.getAllEmp();//第二个数据源注入的service
		for(Emp emp:partyList) {
			empService.addEmp(emp);//第一个数据源注入的service
		}
	}
}