Spring动态数据源实现读写分离详解

一、创建基于ThreadLocal的动态数据源容器，保证数据源的线程安全性

package com.bounter.mybatis.extension;


public class DynamicDataSourceHolder {

 private static final ThreadLocal dataSourceHolder = new ThreadLocal<>();

 public static void setDataSource(String dataSourceKey) {
 dataSourceHolder.set(dataSourceKey);
 }

 public static String getDataSource() {
 return dataSourceHolder.get();
 }

 public static void clearDataSource() {
 dataSourceHolder.remove();
 }
}

二、定义Spring动态数据源扩展类,用来实现Master、Slave数据源动态切换

package com.bounter.mybatis.extension;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;


public class DynamicDataSource extends AbstractRoutingDataSource {

 @Override
 protected Object determineCurrentLookupKey() {
 //使用DynamicDataSourceHolder保证线程安全
 return DynamicDataSourceHolder.getDataSource();
 }

}

三、配置Master、Slave数据源

1. db.properties配置Master、Slave数据信息

# Master DB
db.master.url=jdbc:mysql://192.168.168.110:3306/bounter?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=PRC&useSSL=false
db.master.username=bounter
# AES encrypt,base64 encode
db.master.password=ZNhnEjauk3pecZxxS84ofA==

# Slave DB
db.slave.url=jdbc:mysql://192.168.168.111:3306/database?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=PRC&useSSL=false
db.slave.username=bounter
# AES encrypt,base64 encode
db.slave.password=jFYmt2f57RHhzItYDhWiSA==

2. Spring 配置文件配置Master、Slave连接池，动态数据源

四、创建数据源切面，通过AOP实现根据Dao层方法前缀动态选取读、写数据源

package com.bounter.mybatis.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.stereotype.Component;

import com.bounter.mybatis.extension.DynamicDataSourceHolder;


@Component
@Aspect
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class DataSourceAspect {

 //读库数据源key
 private static final String DATASOURCE_KEY_READ = "read";
 //查询方法清单
 String[] queryMethods = {"find","get","query","count","select"};

 
 @Before("execution(* com.bounter.mybatis.dao..*.*(..))")
 public void before(JoinPoint point) {
 // 获取到当前执行的方法名
 String methodName = point.getSignature().getName();
 //匹配查询方法
 for(String queryMethod : queryMethods) {
  if(methodName.startsWith(queryMethod)) {
  //查询方法设置数据源为读库
  DynamicDataSourceHolder.setDataSource(DATASOURCE_KEY_READ);
  break;
  }
 }
 }

 
 @After("execution(* com.bounter.mybatis.dao..*.*(..))")
 public void after(JoinPoint point) {
 DynamicDataSourceHolder.clearDataSource();
 }
}

github源码地址：https://github.com/13babybear/bounter-mybatis

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