对于spring集成mybatis如何完成mysql数据库读写分离的案例区分

#主数据库数据源 jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://192.168.0.4:3306/mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=false jdbc.username=root jdbc.password=123456 jdbc.initialSize=1 jdbc.minIdle=1 jdbc.maxActive=20 jdbc.maxWait=60000 jdbc.removeAbandoned=true jdbc.removeAbandonedTimeout=180 jdbc.timeBetweenEvictionRunsMillis=60000 jdbc.minEvictableIdleTimeMillis=300000 jdbc.validationQuery=SELECT 1 jdbc.testWhileIdle=true jdbc.testOnBorrow=false jdbc.testOnReturn=false #从数据库数据源 slave.jdbc.driverClassName=com.mysql.jdbc.Driver slave.jdbc.url=jdbc:mysql://192.168.0.221:3306/mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=false slave.jdbc.username=root slave.jdbc.password=123456 slave.jdbc.initialSize=1 slave.jdbc.minIdle=1 slave.jdbc.maxActive=20 slave.jdbc.maxWait=60000 slave.jdbc.removeAbandoned=true slave.jdbc.removeAbandonedTimeout=180 slave.jdbc.timeBetweenEvictionRunsMillis=60000 slave.jdbc.minEvictableIdleTimeMillis=300000 slave.jdbc.validationQuery=SELECT 1 slave.jdbc.testWhileIdle=true slave.jdbc.testOnBorrow=false slave.jdbc.testOnReturn=false

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.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"> <!-- master数据源 --> <bean id="masterDataSource" class="com.alibaba.druid.pool.DruidDataSource"> <!-- 基本属性 url、user、password --> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="initialSize" value="${jdbc.initialSize}" /> <property name="minIdle" value="${jdbc.minIdle}" /> <property name="maxActive" value="${jdbc.maxActive}" /> <property name="maxWait" value="${jdbc.maxWait}" /> <!-- 超过时间限制是否回收 --> <property name="removeAbandoned" value="${jdbc.removeAbandoned}" /> <!-- 超过时间限制多长； --> <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}" /> <!-- 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="${jdbc.timeBetweenEvictionRunsMillis}" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}" /> <!-- 用来检测连接是否有效的sql，要求是一个查询语句--> <property name="validationQuery" value="${jdbc.validationQuery}" /> <!-- 申请连接的时候检测 --> <property name="testWhileIdle" value="${jdbc.testWhileIdle}" /> <!-- 申请连接时执行validationQuery检测连接是否有效，配置为true会降低性能 --> <property name="testOnBorrow" value="${jdbc.testOnBorrow}" /> <!-- 归还连接时执行validationQuery检测连接是否有效，配置为true会降低性能 --> <property name="testOnReturn" value="${jdbc.testOnReturn}" /> </bean> <!-- slave数据源 --> <bean id="slaveDataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${slave.jdbc.driverClassName}" /> <property name="url" value="${slave.jdbc.url}" /> <property name="username" value="${slave.jdbc.username}" /> <property name="password" value="${slave.jdbc.password}" /> <property name="initialSize" value="${slave.jdbc.initialSize}" /> <property name="minIdle" value="${slave.jdbc.minIdle}" /> <property name="maxActive" value="${slave.jdbc.maxActive}" /> <property name="maxWait" value="${slave.jdbc.maxWait}" /> <property name="removeAbandoned" value="${slave.jdbc.removeAbandoned}" /> <property name="removeAbandonedTimeout" value="${slave.jdbc.removeAbandonedTimeout}" /> <property name="timeBetweenEvictionRunsMillis" value="${slave.jdbc.timeBetweenEvictionRunsMillis}" /> <property name="minEvictableIdleTimeMillis" value="${slave.jdbc.minEvictableIdleTimeMillis}" /> <property name="validationQuery" value="${slave.jdbc.validationQuery}" /> <property name="testWhileIdle" value="${slave.jdbc.testWhileIdle}" /> <property name="testOnBorrow" value="${slave.jdbc.testOnBorrow}" /> <property name="testOnReturn" value="${slave.jdbc.testOnReturn}" /> </bean> <!-- 动态数据源，根据service接口上的注解来决定取哪个数据源 --> <bean id="dataSource" class="com.yzb.util.DynamicDataSource"> <property name="targetDataSources"> <map key-type="java.lang.String"> <!-- write or slave --> <entry key="slave" value-ref="slaveDataSource"/> <!-- read or master --> <entry key="master" value-ref="masterDataSource"/> </map> </property> <property name="defaultTargetDataSource" ref="masterDataSource"/> </bean> <!-- Mybatis文件 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:mybatis-config.xml" /> <property name="dataSource" ref="dataSource" /> <!-- 映射文件路径 --> <property name="mapperLocations" value="classpath*:dbmappers/*.xml" /> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.yzb.dao" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> <!-- 事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 声明式开启 --> <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" order="1"/> <!-- 为业务逻辑层的方法解析@DataSource注解 为当前线程的HandleDataSource注入数据源 --> <bean id="dataSourceAspect" class="com.yzb.util.DataSourceAspect" /> <aop:config proxy-target-class="true"> <aop:aspect id="dataSourceAspect" ref="dataSourceAspect" order="2"> <aop:pointcut id="tx" exdivssion="execution(* com.yzb.service.impl..*.*(..)) "/> <aop:before pointcut-ref="tx" method="before" /> </aop:aspect> </aop:config> </beans>

package com.yzb.util; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; /** * 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。 * */ @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface DataSource { String value(); }

package com.yzb.util; import java.lang.reflect.Method; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.reflect.MethodSignature; public class DataSourceAspect { /** * 在dao层方法获取datasource对象之前，在切面中指定当前线程数据源 */ public void before(JoinPoint point) { Object target = point.getTarget(); String method = point.getSignature().getName(); Class<?>[] classz = target.getClass().getInterfaces(); // 获取目标类的接口， 所以@DataSource需要写在接口上 Class<?>[] parameterTypes = ((MethodSignature) point.getSignature()) .getMethod().getParameterTypes(); try { Method m = classz[0].getMethod(method, parameterTypes); if (m != null && m.isAnnotationPresent(DataSource.class)) { DataSource data = m.getAnnotation(DataSource.class); System.out.println("用户选择数据库库类型：" + data.value()); HandleDataSource.putDataSource(data.value()); // 数据源放到当前线程中 } } catch (Exception e) { e.printStackTrace(); } } }

package com.yzb.util; import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; public class DynamicDataSource extends AbstractRoutingDataSource { /** * 获取与数据源相关的key 此key是Map<String,DataSource> resolvedDataSources 中与数据源绑定的key值 * 在通过determineTargetDataSource获取目标数据源时使用 */ @Override protected Object determineCurrentLookupKey() { return HandleDataSource.getDataSource(); } }

package com.yzb.util; public class HandleDataSource { public static final ThreadLocal<String> holder = new ThreadLocal<String>(); /** * 绑定当前线程数据源 * * @param key */ public static void putDataSource(String datasource) { holder.set(datasource); } /** * 获取当前线程的数据源 * * @return */ public static String getDataSource() { return holder.get(); } }

package com.yzb.service; import java.util.List; import com.yzb.model.Person; import com.yzb.util.DataSource; public interface IPersonService { /** * 加载全部的person * @return */ List<Person> listAllPerson(); /** * 查询某个人的信息 * @param personId * @return */ @DataSource("slave") // 指定使用从数据源 Person getPerson(int personId); boolean updatePerson(Person person); }