经过测试，MySQL的ReplicationConnection在和Druid连接池使用时，会经常出现连接断开不可用的问题，推测是主从配置不一样，导致超出生存时间的问题。
鉴于实际情况中，主从的配置有分开配置的需求，弃用Replication方案，使用多数据源解决
applicationContext.xml 加入多个数据源：
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<?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:tx=
"http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http:
//www.springframework.org/schema/beans
http:
//www.springframework.org/schema/beans/spring-beans-3.0.xsd
http:
//www.springframework.org/schema/context
http:
//www.springframework.org/schema/context/spring-context-3.0.xsd
http:
//www.springframework.org/schema/tx
http:
//www.springframework.org/schema/tx/spring-tx-2.0.xsd
">
<bean id=
"masterDataSource"
class
=
"com.alibaba.druid.pool.DruidDataSource"
init-method=
"init"
destroy-method=
"close"
>
<!-- 基本属性 url、user、password -->
<property name=
"driverClassName"
value=
"${jdbc.driverclass}"
/>
<property name=
"url"
value=
"${jdbc.url}"
/>
<!--
<property name=
"url"
value=
"${jdbc.url}?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true"
/>
<property name=
"url"
value=
"${jdbc.url}?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true"
/>
-->
<property name=
"username"
value=
"${jdbc.username}"
/>
<property name=
"password"
value=
"${jdbc.password}"
/>
<!-- 配置初始化大小、最小、最大 -->
<property name=
"initialSize"
value=
"5"
/>
<property name=
"minIdle"
value=
"15"
/>
<property name=
"maxActive"
value=
"100"
/>
<!-- 配置获取连接等待超时的时间 -->
<property name=
"maxWait"
value=
"60000"
/>
<!-- 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=
"true"
/>
<property name=
"testOnReturn"
value=
"false"
/>
<!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
<property name=
"poolPreparedStatements"
value=
"true"
/>
<property name=
"maxPoolPreparedStatementPerConnectionSize"
value=
"20"
/>
<!-- 配置监控统计拦截的filters -->
<property name=
"filters"
value=
"stat,log4j"
/>
</bean>
<bean id=
"slaveDataSource"
class
=
"com.alibaba.druid.pool.DruidDataSource"
init-method=
"init"
destroy-method=
"close"
>
<!-- 基本属性 url、user、password -->
<property name=
"driverClassName"
value=
"${jdbc.driverclass}"
/>
<property name=
"url"
value=
"${read.jdbc.url}"
/>
<!--
<property name=
"url"
value=
"${jdbc.url}?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true"
/>
<property name=
"url"
value=
"${jdbc.url}?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true"
/>
-->
<property name=
"username"
value=
"${read.jdbc.username}"
/>
<property name=
"password"
value=
"${read.jdbc.password}"
/>
<!-- 配置初始化大小、最小、最大 -->
<property name=
"initialSize"
value=
"5"
/>
<property name=
"minIdle"
value=
"15"
/>
<property name=
"maxActive"
value=
"100"
/>
<!-- 配置获取连接等待超时的时间 -->
<property name=
"maxWait"
value=
"60000"
/>
<!-- 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=
"true"
/>
<property name=
"testOnReturn"
value=
"false"
/>
<!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
<property name=
"poolPreparedStatements"
value=
"true"
/>
<property name=
"maxPoolPreparedStatementPerConnectionSize"
value=
"20"
/>
<!-- 配置监控统计拦截的filters -->
<property name=
"filters"
value=
"stat,log4j"
/>
</bean>
<bean id=
"dataSource"
class
=
"com.qding.order.dao.util.DynamicDataSource"
>
<property name=
"targetDataSources"
>
<map key-type=
"java.lang.String"
>
<entry key=
"master"
value-ref=
"masterDataSource"
/>
<entry key=
"slave"
value-ref=
"slaveDataSource"
/>
</map>
</property>
<property name=
"defaultTargetDataSource"
ref=
"masterDataSource"
/>
</bean>
</beans>
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加入数据源动态切换 DynamicDataSource:
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public
class
DynamicDataSource
extends
AbstractRoutingDataSource {
@Override
protected
Object determineCurrentLookupKey() {
return
DynamicDataSourceHolder.getDataSouce();
}
}
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DynamicDataSourceHolder:
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public
class
DynamicDataSourceHolder {
public
static
final
ThreadLocal<String> holder =
new
ThreadLocal<String>();
public
static
void
putDataSource(String name) {
holder.set(name);
}
public
static
String getDataSouce() {
return
holder.get();
}
}
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改变代理实现 ReadOnlyTransFactoryBean：
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public
Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy)
throws
Throwable {
T service = applicationContext.getBean(delegateBeanName, serviceInterface);
try
{
DynamicDataSourceHolder.putDataSource(
"slave"
);
DataSourceTransactionManager txManager = applicationContext.getBean(DataSourceTransactionManager.
class
);
DefaultTransactionDefinition definition =
new
DefaultTransactionDefinition(DefaultTransactionDefinition.PROPAGATION_REQUIRED);
definition.setReadOnly(
true
);
logger.info(
"Start ReadOnly Transactional!"
);
TransactionStatus transaction = txManager.getTransaction(definition);
Object result = method.invoke(service, args);
if
(!transaction.isCompleted()) {
txManager.commit(transaction);
}
logger.info(
"End ReadOnly Transactional!"
);
return
result;
}
finally
{
DynamicDataSourceHolder.putDataSource(
"master"
);
}
}
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使用方法不变