Spring+Hibernate框架下Mysql读写分离、主从数据库配
    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 {	@override	protected 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.xsd		http://www.springframework.org/schema/tx 		http://www.springframework.org/schema/tx/spring-tx-3.0.xsd		http://www.springframework.org/schema/aop 		http://www.springframework.org/schema/aop/spring-aop-3.0.xsd		http://www.springframework.org/schema/context		http://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="