Spring+Hibernate框架下Mysql读写分离、主从数据库配

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介绍下mysql数据库读写分离在spring,hibernate框架下的配置。
1.mysql连接配置文件jdbc.properties
master.*.*表示主数据库连接参数，负责增，删，改；
slave.*.*表示从数据库连接参数，只负责读取；
jdbc.properties
master.jdbc.driverclassname=com.mysql.jdbc.drivermaster.jdbc.url=********master.jdbc.username=********master.jdbc.password=********slave.jdbc.driverclassname=com.mysql.jdbc.driverslave.jdbc.url=********slave.jdbc.username=********slave.jdbc.password=********把**改成你所需的连接参数；
2.配置aop切面类 datasourceadvice.java
import java.lang.reflect.method;import org.springframework.aop.afterreturningadvice;import org.springframework.aop.methodbeforeadvice;import org.springframework.aop.throwsadvice;import com.company.datasource.datasourceswitcher;public class datasourceadvice implements methodbeforeadvice, afterreturningadvice, throwsadvice {// service方法执行之前被调用public void before(method method, object[] args, object target) throws throwable {system.out.println("切入点: " + target.getclass().getname() + "类中" + method.getname() + "方法");if(method.getname().startswith("add") || method.getname().startswith("create")|| method.getname().startswith("save")|| method.getname().startswith("edit")|| method.getname().startswith("update")|| method.getname().startswith("delete")|| method.getname().startswith("remove")){system.out.println("切换到: master");datasourceswitcher.setmaster();}else  {system.out.println("切换到: slave");datasourceswitcher.setslave();}}// service方法执行完之后被调用public void afterreturning(object arg0, method method, object[] args, object target) throws throwable {}// 抛出exception之后被调用public void afterthrowing(method method, object[] args, object target, exception ex) throws throwable {datasourceswitcher.setslave();system.out.println("出现异常,切换到: slave");}}
数据源选择类 datasourceswitcher.java
package com.company.datasource;import org.springframework.util.assert;public class datasourceswitcher {@suppresswarnings("rawtypes")private static final threadlocal contextholder = new threadlocal();@suppresswarnings("unchecked")public static void setdatasource(string datasource) {assert.notnull(datasource, "datasource cannot be null");contextholder.set(datasource);}public static void setmaster(){cleardatasource();    }public static void setslave() {setdatasource("slave");}public static string getdatasource() {return (string) contextholder.get();}public static void cleardatasource() {contextholder.remove();}}
dynamicdatasource.java数据源动态切换类
package com.company.datasource;import org.springframework.jdbc.datasource.lookup.abstractroutingdatasource;public class dynamicdatasource extends abstractroutingdatasource {@overrideprotected object determinecurrentlookupkey() {return datasourceswitcher.getdatasource();}}
下面配置spring applicationcontext.xml文件
<?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-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsd"><context:annotation-config /><!-- 自动加载service dao action --><context:component-scan base-package="cn.com.company.dao.*" /><context:component-scan base-package="cn.com.company.service.*" /><context:component-scan base-package="cn.com.company.action" /><!-- 加载properties配置文件 --><bean id="propertyconfigurer"class="org.springframework.beans.factory.config.propertyplaceholderconfigurer"><property name="locations"><list><value>classpath:jdbc.properties</value></list></property></bean><bean id="parentdatasource" class="com.mchange.v2.c3p0.combopooleddatasource">//***c3p0配置</bean>     <!-- 主数据源--><bean id="masterdatasource" parent="parentdatasource"><property name="driverclass" value="${master.jdbc.driverclassname}" /><property name="jdbcurl" value="${master.jdbc.url}" /><property name="user" value="${master.jdbc.username}" /><property name="password" value="${master.jdbc.password}" /></bean>    <!-- 从数据源--><bean id="slavedatasource" parent="parentdatasource"><property name="driverclass" value="${slave.jdbc.driverclassname}" /><property name="jdbcurl" value="${slave.jdbc.url}" /><property name="user" value="${slave.jdbc.username}" /><property name="password" value="${slave.jdbc.password}" /></bean><bean id="datasource" class="com.company.datasource.dynamicdatasource"><property name="targetdatasources"><map key-type="java.lang.string"><entry key="slave" value-ref="slavedatasource" /></map></property><property name="defaulttargetdatasource" ref="masterdatasource" /></bean><!-- 配置sessionfactory --><bean id="sessionfactory"class="org.springframework.orm.hibernate3.annotation.annotationsessionfactorybean"><property name="datasource" ref="datasource"></property><property name="packagestoscan" value="cn.com.company.entity" /><property name="hibernateproperties"><props><prop>//***hibernate一些参数这里不写了</prop></props></property></bean><!-- 切换数据源 --><bean id="datasourceadvice" class="com.company.aop.datasourceadvice" /><aop:config><aop:advisorpointcut="execution(* cn.com.company.service..*service.*(..))"advice-ref="datasourceadvice" /></aop:config><!-- 配置事务管理器 --><bean id="transactionmanager"class="org.springframework.orm.hibernate3.hibernatetransactionmanager"><property name="sessionfactory"><ref bean="sessionfactory" /></property></bean><!--配置事务的传播特性 --><tx:advice id="txadvice" transaction-manager="transactionmanager"><tx:attributes><!-- 对增、删、改方法进行事务支持 --><tx:method name="add*" propagation="required" /><tx:method name="create*" propagation="required" /><tx:method name="save*" propagation="required" /><tx:method name="edit*" propagation="required" /><tx:method name="update*" propagation="required" /><tx:method name="delete*" propagation="required" /><tx:method name="remove*" propagation="required" /><!-- 对查找方法进行只读事务 --><tx:method name="loadbyusername*" propagation="supports" read-only="true" /><!-- 对其它方法进行只读事务 --><tx:method name="*" propagation="supports" read-only="true" /></tx:attributes></tx:advice><!--那些类的哪些方法参与事务 --><aop:config><aop:advisorpointcut="execution(* cn.com.company.service..*service.*(..))"advice-ref="txadvice" /><aop:advisorpointcut="execution(* cn.com.company.service..*serviceimpl.*(..))"advice-ref="txadvice" /></aop:config></beans>
！注 applicationcontenxt.xml中
<!-- 切换数据源 -->
<bean id="datasourceadvice" class="com.company.aop.datasourceadvice" />
<aop:config>
<aop:advisor
pointcut="execution(* cn.com.company.service..*service.*(..))"
advice-ref="datasourceadvice" />
</aop:config>
一定要配置在事务aop之上