spring 静态数据源动态切换

beans.xml

<?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"
 xmlns:task="http://www.springframework.org/schema/task"
 xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-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/tx 
           http://www.springframework.org/schema/tx/spring-tx-3.0.xsd  
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/task          
     http://www.springframework.org/schema/task/spring-task-3.0.xsd">
 <context:annotation-config />
 <aop:aspectj-autoproxy />
 <!--加入此段配置， -->
 <context:component-scan base-package="zh.task" />
 <!-- Enables the Spring Task @Scheduled programming model -->
 <task:executor id="executor" pool-size="1" />
 <task:scheduler id="scheduler" pool-size="1" />
 <task:annotation-driven executor="executor"
  scheduler="scheduler" />
 <bean id="propertyConfigurer"
  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="locations" value="classpath:jdbc.properties" />
 </bean>
 <!-- ========================= DataSource config ========================= -->
 <bean id="dataSource1" class="com.alibaba.druid.pool.DruidDataSource"
  init-method="init" destroy-method="close">
  <property name="url" value="${jdbc_url1}" />
  <property name="username" value="${jdbc_user1}" />
  <property name="password" value="${jdbc_password1}" />
  <property name="maxActive" value="20" />
  <property name="initialSize" value="1" />
  <property name="maxWait" value="60000" />
  <property name="minIdle" value="1" />
  <property name="timeBetweenEvictionRunsMillis" value="60000" />
  <property name="minEvictableIdleTimeMillis" value="300000" />
  <property name="testWhileIdle" value="true" />
  <property name="testOnBorrow" value="false" />
  <property name="testOnReturn" value="false" />
  <property name="poolPreparedStatements" value="true" />
  <property name="maxPoolPreparedStatementPerConnectionSize"
   value="50" />
  <property name="filters" value="stat,log4j" />
  <property name="proxyFilters" ref="log-filter" />

 </bean>
 <bean id="dataSource2" class="com.alibaba.druid.pool.DruidDataSource"
  init-method="init" destroy-method="close">
  <property name="url" value="${jdbc_url2}" />
  <property name="username" value="${jdbc_user2}" />
  <property name="password" value="${jdbc_password2}" />
  <property name="maxActive" value="20" />
  <property name="initialSize" value="1" />
  <property name="maxWait" value="60000" />
  <property name="minIdle" value="1" />
  <property name="timeBetweenEvictionRunsMillis" value="60000" />
  <property name="minEvictableIdleTimeMillis" value="300000" />
  <property name="testWhileIdle" value="true" />
  <property name="testOnBorrow" value="false" />
  <property name="testOnReturn" value="false" />
  <property name="poolPreparedStatements" value="true" />
  <property name="maxPoolPreparedStatementPerConnectionSize"
   value="50" />
  <property name="filters" value="stat,log4j" />
  <property name="proxyFilters" ref="log-filter" />

 </bean>
 <bean id="log-filter" class="com.alibaba.druid.filter.logging.Log4jFilter">
  <property name="resultSetLogEnabled" value="false" />
  <property name="statementExecutableSqlLogEnable" value="true" />
  <property name="statementLoggerName" value="sqlLogger" />
 </bean>
 <!-- ibatis配置 -->
 <bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
  <property name="configLocation" value="classpath:ibatis.xml" />
  <property name="dataSource" ref="dataSource" />
 </bean>
 <bean id="dataSource" class="zh.dbcenter.DynamicDataSource1">
  <property name="targetDataSources">
   <map key-type="java.lang.String">
    <entry key="dataSource2" value-ref="dataSource2" />
    <entry key="dataSource1" value-ref="dataSource1" />
   </map>
  </property>
  <property name="defaultTargetDataSource" ref="dataSource1" />
 </bean>

DbContextHolder.java

public class DbContextHolder {
 
 private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();  
   
    public static void setDBType(String dbType) { 
     System.out.println((String) contextHolder.get());
        contextHolder.set(dbType);  
    }  
  
    public static String getDBType() {  
        return (String) contextHolder.get();  
    }  
  
    public static void clearDBType() {  
        contextHolder.remove();  
    } 
}

DynamicDataSource1.java

import org.apache.log4j.Logger;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class DynamicDataSource1 extends AbstractRoutingDataSource {
 Logger log = Logger.getLogger("DynamicDataSource"); 
 @Override
 protected Object determineCurrentLookupKey() {
  return DbContextHolder.getDBType();
 } 
 
 
 
 
}

DBCenter2.java

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import zh.Dao.CampusDao;
 
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath*:beans1.xml"}) 
public class DBCenter2 { 
 
 @Autowired
 private CampusDao campusDao;
  
 @Test 
 public void testCampusAll() { 
  
  System.out.println("傻逼");
  System.out.println(campusDao.findAll().get(0));
  DbContextHolder.setDBType("dataSource2");
  System.out.println(campusDao.findAll().get(0));
  DbContextHolder.setDBType("default_dataSource");
  System.out.println(campusDao.findAll().get(0));
  
 }
}