详解利用Spring的AbstractRoutingDataSource解决多数据源的问题

多数据源问题很常见，例如读写分离数据库配置。

原来的项目出现了新需求，局方要求新增某服务器用以提供某代码，涉及到多数据源的问题。

研究成果如下：

1、首先配置多个datasource

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> 
    <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver"> 
    </property> 
    <property name="url" value="jdbc:jtds:sqlserver://10.82.81.51:1433;databaseName=standards"> 
    </property> 
    <property name="username" value="youguess"></property> 
    <property name="password" value="youguess"></property> 
  </bean> 
  <bean id="dataSource2" class="org.apache.commons.dbcp.BasicDataSource"> 
    <property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver"> 
    </property> 
    <property name="url" value="jdbc:jtds:sqlserver://10.82.81.52:1433;databaseName=standards"> 
    </property> 
    <property name="username" value="youguess"></property> 
    <property name="password" value="youguess"></property> 
</bean>

2、写一个DynamicDataSource类继承AbstractRoutingDataSource，并实现determineCurrentLookupKey方法

package com.standard.core.util; 
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 
public class DynamicDataSource extends AbstractRoutingDataSource { 
  @Override 
  protected Object determineCurrentLookupKey() { 
    return CustomerContextHolder.getCustomerType(); 
  } 
}

3、利用ThreadLocal解决线程安全问题

package com.standard.core.util; 
public class CustomerContextHolder { 
  public static final String DATA_SOURCE_A = "dataSource"; 
  public static final String DATA_SOURCE_B = "dataSource2"; 
  private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 
  public static void setCustomerType(String customerType) { 
    contextHolder.set(customerType); 
  } 
  public static String getCustomerType() { 
    return contextHolder.get(); 
  } 
  public static void clearCustomerType() { 
    contextHolder.remove(); 
  } 
}

4、数据源配置

<bean id="dynamicDataSource" class="com.standard.core.util.DynamicDataSource" > 
    <property name="targetDataSources"> 
      <map key-type="java.lang.String"> 
        <entry value-ref="dataSource" key="dataSource"></entry> 
        <entry value-ref="dataSource2" key="dataSource2"></entry> 
      </map> 
    </property> 
    <property name="defaultTargetDataSource" ref="dataSource" > 
    </property> 
  </bean>

5、在DAOImpl中切换数据源

复制代码代码如下:

CustomerContextHolder.setCustomerType(CustomerContextHolder.DATA_SOURCE_B);

搞定！

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持社区。