本來呢，直接使用mybatis-spring-boot-starter還是挺好的，但是我們系統比較複雜，有多個數據源，其中一個平臺自己的資料來源，另外一些是動態配置出來的，兩者完全沒有關係。所以直接使用mybatis-spring-boot-starter就很麻煩了，會報下列錯誤：

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'javax.sql.DataSource' available: expected single matching bean but found 2: dataSource,branchta
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:
 
1041)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:345)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:
 
1090)
    at org.springframework.boot.autoconfigure.jdbc.DataSourceInitializer.init(DataSourceInitializer.java:77)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

具體是init()中基於型別獲取dataSource的原因：
    @PostConstruct
    public void init() {
        if (!this.properties.isInitialize()) {
            logger.debug(
 
"Initialization disabled (not running DDL scripts)");
            return;
        }
        if (this.applicationContext.getBeanNamesForType(DataSource.class, false,
                false).length > 0) {
            this.dataSource = this.applicationContext.getBean(DataSource.class);
        }
        if (this.dataSource == null) {
            logger.debug("No DataSource found so not initializing");
            return;
        }
        runSchemaScripts();
    }

就只能蛻回去使用mybatis-spring了。啟動的時候發現死活注入不進去，報下列錯誤：

參考了http://www.cnblogs.com/insaneXs/p/9270071.html和https://blog.csdn.net/qq_21853607/article/details/72802080，經驗證並非他們所述的問題。我debug的時候，發現mapper物件是有的，而不是第一個所述的沒有建立代理，最後debug的時候發現好像是druiddatasouce bean建立的時候出錯了，但是沒有堆疊資訊。完整的配置如下：

application-bean.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:tx="http://www.springframework.org/schema/tx"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd">

    <context:property-placeholder location="classpath*:jrescloud.properties" ignore-unresolvable="true" order="1"/>

    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="${spring.datasource.driver-class-name}"/>
        <property name="url" value="${spring.datasource.url}"/>
        <property name="username" value="${spring.datasource.username}"/>
        <property name="password" value="${spring.datasource.password}"/>
        <!-- 配置初始化大小、最小、最大 -->
        <!-- <property name="initialSize" value="1"/>
        <property name="minIdle" value="100000"/>
        <property name="maxActive" value="10"/> -->
        <!-- 配置獲取連線等待超時的時間 -->
        <!-- <property name="maxWait" value="${jdbc.maxWait}"/>
        開啟PSCache，並且指定每個連線上PSCache的大小
        <property name="poolPreparedStatements" value="${jdbc.pps}"/>
        <property name="maxPoolPreparedStatementPerConnectionSize" value="${jdbc.mpps}"/>
        配置間隔多久才進行一次檢測，檢測需要關閉的空閒連線，單位是毫秒
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}"/>
        配置一個連線在池中最小生存的時間，單位是毫秒
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}"/>
        <property name="removeAbandoned" value="${jdbc.removeAbandoned}"/>
        <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
        <property name="logAbandoned" value="${jdbc.logAbandoned}"/>
        配置監控統計攔截的filters
        <property name="filters" value="${jdbc.filters}"/> -->
    </bean>
    
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- 使用annotation 自動註冊bean, 並保證@Required、@Autowired的屬性被注入 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="${mybatis.configLocation}"/>
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations">
            <list>
                <value>${mybatis.mapperLocations}</value>
            </list>
        </property>
    </bean>
</beans>

package com.XX.XXX.XXXX.config;

import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MybatisConfig {

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");
        mapperScannerConfigurer.setBasePackage("com.XX.XXX.XXXX.*.mapper");
        return mapperScannerConfigurer;
    }
}

package com.XX.XXX.XXXX.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;

@Configuration
@ImportResource(locations={"classpath:application-bean.xml"})
public class AppConfig {

    @Bean
    public DynamicDataSourceRegister dynamicDataSourceRegister() {
        return new DynamicDataSourceRegister();
    }
    
    @Bean
    public DynamicDataSourceConfig getDynamicDataSourceConfig() {
        return new DynamicDataSourceConfig();
    }
}