springmvc +mybatis 配置多数据源

1.数据源配置：

jdbc_multiple.properties：

# MySQL
#============================================================================
jdbc.mysql.driver=com.mysql.jdbc.Driver
jdbc.mysql.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
jdbc.mysql.username=root
jdbc.mysql.password=root
# MS SQL Server (JTDS)
#============================================================================
jdbc.sqlserver.driver=net.sourceforge.jtds.jdbc.Driver
jdbc.sqlserver.url=jdbc:jtds:sqlserver://127.0.0.1:1433/test
jdbc.sqlserver.username=sa
jdbc.sqlserver.password=sa

# 通用配置
#============================================================================
jdbc.initialSize=5
jdbc.minIdle=5
jdbc.maxIdle=20
jdbc.maxActive=100
jdbc.maxWait=100000

2.spring-mybatis.xml配置：

　　

<context:component-scan base-package="xxx" >
        <!-- spring 自动扫描注解的时候，不去扫描@Controller -->
        <context:exclude-filter type ="annotation" expression= "org.springframework.stereotype.Controller" />
    </context:component-scan>

 <context:property-placeholder location="classpath:conf/jdbc_multiple.properties" />

    <!-- 多数据源配置 -->
    <bean id="sqlServerDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.sqlserver.driver}"/>
        <property name="url" value="${jdbc.sqlserver.url}"/>
        <property name="username" value="${jdbc.sqlserver.username}"/>
        <property name="password" value="${jdbc.sqlserver.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
    </bean>
    <bean id="mySqlDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.mysql.driver}"/>
        <property name="url" value="${jdbc.mysql.url}"/>
        <property name="username" value="${jdbc.mysql.username}"/>
        <property name="password" value="${jdbc.mysql.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}"/>
        <property name="minIdle" value="${jdbc.minIdle}"/>
        <property name="maxIdle" value="${jdbc.maxIdle}"/>
        <property name="maxActive" value="${jdbc.maxActive}"/>
        <property name="maxWait" value="${jdbc.maxWait}"/>
        <property name="defaultAutoCommit" value="${jdbc.defaultAutoCommit}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}"/>
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
        <property name="numTestsPerEvictionRun" value="${jdbc.numTestsPerEvictionRun}"/>
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
    </bean>
    　　　　　　　　　　　　　　　　
    <bean id="dataSource" class="xxxx.DbcontextHolder"><!-- 这里写选择数据源的类地址 下面跟着给出-->
        <property name="defaultTargetDataSource" ref="mySqlDataSource"/><!-- 设置默认为此mySqlDataSource数据源-->
        <property name="targetDataSources">
            <map>
                <entry key="mySqlDataSource" value-ref="mySqlDataSource"/>
                <entry key="sqlServerDataSource" value-ref="sqlServerDataSource"/>
            </map>
        </property>
    </bean>

3.DbcontextHolder类（作用是设置你当前的数据源）

public class DbcontextHolder extends AbstractRoutingDataSource {

    public static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();

    /**
     * 设置当前数据源
     * @param dbType
     */
    public static void setDbType(String dbType){
        contextHolder.set(dbType);
    }
    /**
     * 获得当前数据源
     * @return
     */
    public static String getDbType(){
        String dbType = (String)contextHolder.get();
        return dbType;
    }
    /**
     *清除上下文
     *
     */
    public void clearContext(){
        contextHolder.remove();
    }
    @Override
    protected Object determineCurrentLookupKey() {
        return DbcontextHolder.getDbType();
    }
}

4.使用方式：当你需要进行crud等数据库操作的之前 设置你需要使用的数据源即可

例：　

@Transactional
    public void  findOrder(){
         List<PayOrder> list = new ArrayList<>();
         DbcontextHolder.setDbType("sqlServerDataSource");//设置后 就OK
         list =mapper.findByUid("-14663");
         System.out.println(list);
    }