spring集成mybatis实现mysql数据库读写分离

#主数据库数据源jdbc.driverClassName=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://192.168.0.4:3306/mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=falsejdbc.username=rootjdbc.password=123456jdbc.initialSize=1jdbc.minIdle=1jdbc.maxActive=20jdbc.maxWait=60000jdbc.removeAbandoned=truejdbc.removeAbandonedTimeout=180jdbc.timeBetweenEvictionRunsMillis=60000jdbc.minEvictableIdleTimeMillis=300000jdbc.validationQuery=SELECT 1jdbc.testWhileIdle=truejdbc.testOnBorrow=falsejdbc.testOnReturn=false#从数据库数据源slave.jdbc.driverClassName=com.mysql.jdbc.Driverslave.jdbc.url=jdbc:mysql://192.168.0.221:3306/mybatis?useUnicode=true&characterEncoding=utf-8&useSSL=falseslave.jdbc.username=rootslave.jdbc.password=123456slave.jdbc.initialSize=1slave.jdbc.minIdle=1slave.jdbc.maxActive=20slave.jdbc.maxWait=60000slave.jdbc.removeAbandoned=trueslave.jdbc.removeAbandonedTimeout=180slave.jdbc.timeBetweenEvictionRunsMillis=60000slave.jdbc.minEvictableIdleTimeMillis=300000slave.jdbc.validationQuery=SELECT 1slave.jdbc.testWhileIdle=trueslave.jdbc.testOnBorrow=falseslave.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" expression="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);}