关于spring+springMvc+mybatis整合，配置多数据源
spring整合mybatis配置文件部分
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 加载数据库配置文件 -->
<context:property-placeholder location="classpath:database/jdbc.properties"
ignore-unresolvable="true" />
<!-- 开启AOP监听 只对当前配置文件有效 -->
<aop:aspectj-autoproxy expose-proxy="true" />
<!-- 配置源数据库数据源-->
<bean id="dataSourceSqlServer" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<!-- 基本属性 url、user、password -->
<property name="driverClassName" value="${enbrands.driverClassName}" />
<property name="url" value="${enbrands.url}" />
<property name="username" value="${enbrands.username}" />
<property name="password" value="${enbrands.password}" />
<!-- 配置初始化大小、最小、最大 -->
<property name="initialSize" value="${druid.initialSize}" />
<property name="minIdle" value="${druid.minIdle}" />
<property name="maxActive" value="${druid.maxActive}" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="${druid.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="${druid.timeBetweenEvictionRunsMillis}" />
<!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="${druid.minEvictableIdleTimeMillis}" />
<property name="validationQuery" value="${druid.validationQuery}" />
<property name="testWhileIdle" value="${druid.testWhileIdle}" />
<property name="testOnBorrow" value="${druid.testOnBorrow}" />
<property name="testOnReturn" value="${druid.testOnReturn}" />
<!-- 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。 -->
<property name="poolPreparedStatements" value="${druid.poolPreparedStatements}" />
<property name="maxPoolPreparedStatementPerConnectionSize"
value="${druid.maxPoolPreparedStatementPerConnectionSize}" />
<!-- 配置监控统计拦截的filters -->
<property name="filters" value="${druid.filters}" />
</bean>
<!-- 配置目标数据库数据源-->
<bean id="dataSourceMySql" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<!-- 基本属性 url、user、password -->
<property name="driverClassName" value="${target.driverClassName}" />
<property name="url" value="${target.url}" />
<property name="username" value="${target.username}" />
<property name="password" value="${target.password}" />
<!-- 配置初始化大小、最小、最大 -->
<property name="initialSize" value="${druid.initialSize}" />
<property name="minIdle" value="${druid.minIdle}" />
<property name="maxActive" value="${druid.maxActive}" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="${druid.maxWait}" />
<!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="${druid.timeBetweenEvictionRunsMillis}" />
<!-- 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="${druid.minEvictableIdleTimeMillis}" />
<property name="validationQuery" value="${druid.validationQuery}" />
<property name="testWhileIdle" value="${druid.testWhileIdle}" />
<property name="testOnBorrow" value="${druid.testOnBorrow}" />
<property name="testOnReturn" value="${druid.testOnReturn}" />
<!-- 打开PSCache，并且指定每个连接上PSCache的大小 如果用Oracle，则把poolPreparedStatements配置为true，mysql可以配置为false。 -->
<property name="poolPreparedStatements" value="${druid.poolPreparedStatements}" />
<property name="maxPoolPreparedStatementPerConnectionSize"
value="${druid.maxPoolPreparedStatementPerConnectionSize}" />
<!-- 配置监控统计拦截的filters -->
<property name="filters" value="${druid.filters}" />
</bean>
<bean id="dataSourceProxy"
class="org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy">
<property name="targetDataSource" ref="dataSource" />
</bean>
<!--指定多数据源 -->
<bean id="dataSource" class="com.jjmc.dcl.core.DynamicDataSource">
<property name="targetDataSources">
<map key-type="java.lang.String">
<!-- 指定lookupKey和与之对应的数据源 -->
<entry key="dataSourceSqlServer" value-ref="dataSourceSqlServer"></entry>
<entry key="dataSourceMySql" value-ref="dataSourceMySql"></entry>
</map>
</property>
<!-- 这里可以指定默认的数据源 -->
<property name="defaultTargetDataSource" ref="dataSourceSqlServer" />
</bean>
<!--事务管理器配置 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSourceProxy" />
</bean>
<!-- 声明SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property>
<property name="mapperLocations" value="classpath:mapping/*.xml" />
<!-- <property name="plugins">
<array>
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<value>
helperDialect=oracle
reasonable=true
supportMethodsArguments=true
params=count=countSql
autoRuntimeDialect=true
</value>
</property>
</bean>
</array>
</property> -->
</bean>
<!-- 扫描QMS系统数据层接口 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.jjmc.dcl.dao" />
</bean>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="add*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="insert*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="delete*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
</tx:attributes>
</tx:advice>
<bean id="dataSourceAspect" class="com.jjmc.dcl.core.DynamicDataSourceInterceptor" />
<aop:config>
<aop:aspect ref="dataSourceAspect">
<!-- 拦截所有service方法 -->
<aop:pointcut id="dataSourcePointcut" expression="execution(* com.jjmc.dcl.service.impl.*.*(..))"/>
<aop:before pointcut-ref="dataSourcePointcut" method="intercept" />
</aop:aspect>
</aop:config>
<!-- <aop:config expose-proxy="true" proxy-target-class="true">
只对业务逻辑层实施事务
<aop:pointcut id="txPointcut"
expression="execution(* com.jjmc.dcl.service..*.*(..))" />
<aop:advisor id="txAdvisor" advice-ref="txAdvice"
pointcut-ref="txPointcut" />
</aop:config> -->
</beans>
<!--------------------------------------------------------------------------------------------------------------------------------------------------->
除了配置spring，还需要另外再加三个类用来切换数据源
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**
*
* @author huangtao
* 2017年10月16日下午12:08:10
* business-server
* @parameter
* TODO
*
*/
public class DynamicDataSource extends AbstractRoutingDataSource{
@Override
protected Object determineCurrentLookupKey() {
// 从自定义的位置获取数据源标识
return DynamicDataSourceHolder.getDataSource();
}
}
<!--------------------------------------------------------------------------------------------------------------------------------------------------->
/**
*
* @author huangtao
* 2017年10月16日下午12:09:08
* business-server
* @parameter
* TODO
*
*/
public class DynamicDataSourceHolder {
/**
* 注意：数据源标识保存在线程变量中，避免多线程操作数据源时互相干扰
*/
private static final ThreadLocal<String> THREAD_DATA_SOURCE = new ThreadLocal<String>();
public static String getDataSource() {
return THREAD_DATA_SOURCE.get();
}
public static void setDataSource(String dataSource) {
THREAD_DATA_SOURCE.set(dataSource);
}
public static void clearDataSource() {
THREAD_DATA_SOURCE.remove();
}
}
<!--------------------------------------------------------------------------------------------------------------------------------------------------->
import java.lang.reflect.Method;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.reflect.MethodSignature;
import com.jjmc.dcl.service.DataSource;
/**
*
* @author huangtao
* 2017年10月16日下午12:20:49
* business-server
* @parameter
* TODO
*
*/
public class DynamicDataSourceInterceptor {
// public void setdataSourceMysql(JoinPoint jp)
// {
// DynamicDataSourceHolder.setDataSource("dataSourceSqlServer");
// }
//
// public void setdataSourceSql(JoinPoint jp) {
// DynamicDataSourceHolder.setDataSource("dataSourceMySql");
// }
//
public void intercept(JoinPoint point) throws Exception {
Class<?> target = point.getTarget().getClass();
MethodSignature signature = (MethodSignature) point.getSignature();
// 默认使用目标类型的注解，如果没有则使用其实现接口的注解
for (Class<?> clazz : target.getInterfaces()) {
resolveDataSource(clazz, signature.getMethod());
}
resolveDataSource(target, signature.getMethod());
}
/**
* 提取目标对象方法注解和类型注解中的数据源标识
*
* @param clazz
* @param method
*/
private void resolveDataSource(Class<?> clazz, Method method) {
try {
Class<?>[] types = method.getParameterTypes();
// 默认使用类型注解
if (clazz.isAnnotationPresent(DataSource.class)) {
DataSource source = clazz.getAnnotation(DataSource.class);
DynamicDataSourceHolder.setDataSource(source.value());
}
// 方法注解可以覆盖类型注解
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());
}
}
}
注意：第三个类中注释掉的代码是手动切换，没注释的代码是注解识别，注解可以定义在serviceImpl和dao的方法上，这个项目是定义在serviceImpl的方法上。
如果要手动切换数据源，那么需要DynamicDataSourceHolder.setDataSource("dataSourceSqlServer");写在java代码中，进行切换数据源。
最后，再定义一个注解
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.lang.annotation.RetentionPolicy;
/**
*
* @author huangtao
* 2017年10月16日下午12:57:23
* business-server
* @parameter
* TODO
* 自定义注解DataSource
*/
@Target(value = { ElementType.TYPE,ElementType.METHOD })
@Retention(value = RetentionPolicy.RUNTIME)
public @interface DataSource {
String value();
}
<!--------------------------------------------------------------------------------------------------------------------------------------------------->
这样就完成了注解自动切换数据源
