spring aop , mysql 主從配置 實現讀寫分離,接下來把自己的配置過程,以及遇到的問題記錄下來,方便下次操作,也希望給一些朋友帶來幫助。
1.使用spring aop 攔截機制現資料來源的動態選取。
import java.lang.annotation.ElementType; import java.lang.annotation.Target; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; /** * 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。 * @author yangGuang * */ @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface DataSource { String value(); }
3.利用Spring的AbstractRoutingDataSource解決多重資料來源的問題
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; public class ChooseDataSource extends AbstractRoutingDataSource { @Override protected Object determineCurrentLookupKey() { return HandleDataSource.getDataSource(); } }
4.利用ThreadLocal解決執行緒安全問題
public class HandleDataSource { public static final ThreadLocal<String> holder = new ThreadLocal<String>(); public static void putDataSource(String datasource) { holder.set(datasource); } public static String getDataSource() { return holder.get(); } }
4.利用ThreadLocal解決線程安全問題
import java.lang.reflect.Method; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.aspectj.lang.reflect.MethodSignature; import org.springframework.stereotype.Component; //@Aspect //@Component public class DataSourceAspect { //@Pointcut("execution(* com.apc.cms.service.*.*(..))") public void pointCut(){}; // @Before(value = "pointCut()") public void before(JoinPoint point) { Object target = point.getTarget(); System.out.println(target.toString()); String method = point.getSignature().getName(); System.out.println(method); Class<?>[] classz = target.getClass().getInterfaces(); Class<?>[] parameterTypes = ((MethodSignature) point.getSignature()) .getMethod().getParameterTypes(); try { Method m = classz[0].getMethod(method, parameterTypes); System.out.println(m.getName()); if (m != null && m.isAnnotationPresent(DataSource.class)) { DataSource data = m.getAnnotation(DataSource.class); HandleDataSource.putDataSource(data.value()); } } catch (Exception e) { e.printStackTrace(); } } }
<!-- 主库数据源 --> <bean id="writeDataSource" class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"> <property name="driverClass" value="com.mysql.jdbc.Driver"/> <property name="jdbcUrl" value="jdbc:mysql://172.22.14.6:3306/cpp?autoReconnect=true"/> <property name="username" value="root"/> <property name="password" value="root"/> <property name="partitionCount" value="4"/> <property name="releaseHelperThreads" value="3"/> <property name="acquireIncrement" value="2"/> <property name="maxConnectionsPerPartition" value="40"/> <property name="minConnectionsPerPartition" value="20"/> <property name="idleMaxAgeInSeconds" value="60"/> <property name="idleConnectionTestPeriodInSeconds" value="60"/> <property name="poolAvailabilityThreshold" value="5"/> </bean> <!-- 从库数据源 --> <bean id="readDataSource" class="com.jolbox.bonecp.BoneCPDataSource" destroy-method="close"> <property name="driverClass" value="com.mysql.jdbc.Driver"/> <property name="jdbcUrl" value="jdbc:mysql://172.22.14.7:3306/cpp?autoReconnect=true"/> <property name="username" value="root"/> <property name="password" value="root"/> <property name="partitionCount" value="4"/> <property name="releaseHelperThreads" value="3"/> <property name="acquireIncrement" value="2"/> <property name="maxConnectionsPerPartition" value="40"/> <property name="minConnectionsPerPartition" value="20"/> <property name="idleMaxAgeInSeconds" value="60"/> <property name="idleConnectionTestPeriodInSeconds" value="60"/> <property name="poolAvailabilityThreshold" value="5"/> </bean> <!-- transaction manager, 事务管理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 注解自动载入 --> <context:annotation-config /> <!--enale component scanning (beware that this does not enable mapper scanning!)--> <context:component-scan base-package="com.apc.cms.persistence.rdbms" /> <context:component-scan base-package="com.apc.cms.service"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Component" /> </context:component-scan> <context:component-scan base-package="com.apc.cms.auth" /> <!-- enable transaction demarcation with annotations --> <tx:annotation-driven /> <!-- define the SqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="typeAliasesPackage" value="com.apc.cms.model.domain" /> </bean> <!-- scan for mappers and let them be autowired --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.apc.cms.persistence" /> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> </bean> <bean id="dataSource" class="com.apc.cms.utils.ChooseDataSource"> <property name="targetDataSources"> <map key-type="java.lang.String"> <!-- write --> <entry key="write" value-ref="writeDataSource"/> <!-- read --> <entry key="read" value-ref="readDataSource"/> </map> </property> <property name="defaultTargetDataSource" ref="writeDataSource"/> </bean> <!-- 激活自动代理功能 --> <aop:aspectj-autoproxy proxy-target-class="true"/> <!-- 配置数据库注解aop --> <bean id="dataSourceAspect" class="com.apc.cms.utils.DataSourceAspect" /> <aop:config> <aop:aspect id="c" ref="dataSourceAspect"> <aop:pointcut id="tx" expression="execution(* com.apc.cms.service..*.*(..))"/> <aop:before pointcut-ref="tx" method="before"/> </aop:aspect> </aop:config> <!-- 配置数据库注解aop -->
@DataSource("write") public void update(User user) { userMapper.update(user); } @DataSource("read") public Document getDocById(long id) { return documentMapper.getById(id); }
<repository> <id>nexus</id> <name>nexus</name> <url>http://repository.sonatype.org/content/groups/public/</url> <layout>default</layout> </repository>
<dependency> <groupId>aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.5.4</version> </dependency> <dependency> <groupId>aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.5.4</version> lt;/dependency>
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