Spring动态配置多数据源

package com.frogking.datasource;
    public class DataSourceConst {
    public static final String Admin="Admin";
    public static final String User = "User";
}

package com.frogking.datasource;

public class DataSourceContextHolder {
    private static final ThreadLocal contextHolder =
            new ThreadLocal(); // 线程本地环境
    // 设置数据源类型
    public static void setDataSourceType(String dataSourceType) {
        contextHolder.set(dataSourceType);
    }
    // 获取数据源类型
    public static String getDataSourceType() {
        return (String) contextHolder.get();
    }
    // 清除数据源类型
    public static void clearDataSourceType () {
        contextHolder.remove();
    }
}

package com.frogking.datasource;

public class DynamicDataSource extends AbstractRoutingDataSource {
    @Override
    protected Object determineCurrentLookupKey() {
        // 在进行DAO操作前，通过上下文环境变量，获得数据源的类型
        return DataSourceContextHolder. getDataSourceType();
    }
}

<!-- 数据源相同的内容 -->
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="parentDataSource">
    <property name="driverClassName">
        <value>com.mysql.jdbc.Driver</value>
    </property>
    <property name="username">
        <value>root</value>
    </property>
    <property name="password">
        <value>1234</value>
    </property>
</bean>
<!-- 以下配置各个数据源的特性 -->
<!-- 数据库test -->
<bean parent="parentDataSource" id="adminDataSource">
    <property name="url">
        <value>jdbc:mysql://localhost:3306/test</value>
    </property>
</bean>
<!-- 不同的数据库test2 -->
<bean parent="parentDataSource" id="userDataSource">
    <property name="url">
        <value>jdbc:mysql://localhost:3306/test2</value>
    </property>
</bean>
<!-- end 配置各个数据源的特性 -->

<bean class="com.frogking.datasource.DynamicDataSource" id="dataSource">
    <property name="targetDataSources">
        <map key-type="java.lang.String">
            <entry value-ref=" adminDataSource " key="Admin"></entry>
            <entry value-ref=" userDataSource " key="User"></entry>
        </map>
    </property>
    <property name="defaultTargetDataSource" ref="adminDataSource"></property>
</bean>

<!-- sessionFactory的配置 -->
<BEAN class="org".springframework.orm.hibernate3.LocalSessionFactoryBean id=sessionFactory>
    <property name="dataSource">
    <REF local="dataSource"> </REF>
    </property>
    <!-- 实体类资源映射 -->
    <property name="mappingResources">
        <LIST>
            <VALUE>com/frogking/entity/User.hbm.xml </VALUE>
            <VALUE>com/frogking/entity/Admin.hbm.xml</VALUE> </LIST>
    </property>
    <!-- 为sessionFactory 配置Hibernate属性 -->
    <property name="hibernateProperties">
        <PROPS>
            <PROP key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</PROP>
            <PROP key="hibernate.show_sql">true</PROP> 
            <PROP key="hibernate.connection.autocommit">false</PROP> 
            <PROP key="hibernate.cache.use_query_cache">false</PROP> 
            <PROP key="hibernate.max_fetch_depth">2</PROP> 
            <PROP key="hibernate.bytecode.use_reflection_optimizer">true</PROP>
        </PROPS>
    </property>
</BEAN>
<!-- 为dao配置sessionFactory -->
<BEAN class="com.frogking.dao.LoginHibernateDao" id=loginDao>
    <property name="sessionFactory">
        <REF local="sessionFactory"> </REF>
    </property>
</BEAN>