spring多数据源配置实现方法实例分析

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
public class DynamicDataSource extends AbstractRoutingDataSource {
  @Override
  protected Object determineCurrentLookupKey() {
    // TODO Auto-generated method stub
    return DbContextHolder.getDbType();
  }
}

public class DbContextHolder {
    private static final ThreadLocal contextHolder = new ThreadLocal();
    public static void setDbType(String dbType)
    {
      contextHolder.set(dbType);
    }
    /**
     * 取得dbtype类型
     * @return
     */
    public static String getDbType()
    {
      String str=(String) contextHolder.get();
      if(null==str || "".equals(str))
        str="1";
      return str;
    }
    public static void clearDbType()
    {
      contextHolder.remove();
    }
}

<!--动态选择数据源-->
  <bean id="dataSource" class="tecamo.core.utils.DynamicDataSource">
    <property name="targetDataSources">
      <map key-type="java.lang.String">
        <entry key="1" value-ref="ds1"/>
        <entry key="2" value-ref="ds2"/>
      </map>
    </property>
    <property name="defaultTargetDataSource" ref="ds1"/>
  </bean>
  <!-- 数据源定义 -->
  <bean id="ds1" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="${jdbc.driverClassName}"/>
    <property name="url" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
  </bean>
  <bean id="ds2" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="${jdbcOrcale.driverClassName}"/>
    <property name="url" value="${jdbcOrcale.url}"/>
    <property name="username" value="${jdbcOrcale.username}"/>
    <property name="password" value="${jdbcOrcale.password}"/>
  </bean>