spring中mybatis配置資料來源讀取不到properties屬性檔案的問題
<bean id="dataSource" class="com.qunar.db.resource.RWDelegatorDataSource">
<constructor-arg index="0" type="java.lang.String" value="${dictDataSource.jdbc.usernameSpace}"/>
<constructor-arg index="1" type="java.lang.String" value="${dictDataSource.jdbc.username}"/>
<constructor-arg index="2" type="java.lang.String" value="${dictDataSource.jdbc.password}"/>
<constructor-arg index="3" type="java.lang.String" value="${dictDataSource.jdbc.db_name}"/>
<constructor-arg index="4" type="int" value="20"/>
<constructor-arg index="5" type="int" value="50"/>
<constructor-arg index="6" type="java.lang.String" value="?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true"/>
<constructor-arg index="7" type="boolean" value="true"/>
<constructor-arg index="8" ref="tomcatJdbcDataSourceFactory"/>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="classpath*:com.anly.portal.*.mapper/*Mapper.xml" />
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.anly.portal.*.mapper"/>
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
此時,啟動會報異常,${jdbc.driver}這樣的表示式獲取不到properties裡面的值,因為MapperScannerConigurer實際是在解析載入bean定義階段的,這個時候要是設定sqlSessionFactory的話,會導致提前初始化一些類,這個時候,PropertyPlaceholderConfigurer還沒來得及替換定義中的變數,導致把表示式當作字串複製了,解決的辦法如下:
修改為
<bean id="tomcatJdbcDataSourceFactory" class="com.qunar.db.resource.impl.TomcatJdbcDataSourceFactory"/>
<bean id="dataSource" class="com.qunar.db.resource.RWDelegatorDataSource">
<constructor-arg index="0" type="java.lang.String" value="${dictDataSource.jdbc.usernameSpace}"/>
<constructor-arg index="1" type="java.lang.String" value="${dictDataSource.jdbc.username}"/>
<constructor-arg index="2" type="java.lang.String" value="${dictDataSource.jdbc.password}"/>
<constructor-arg index="3" type="java.lang.String" value="${dictDataSource.jdbc.db_name}"/>
<constructor-arg index="4" type="int" value="20"/>
<constructor-arg index="5" type="int" value="50"/>
<constructor-arg index="6" type="java.lang.String" value="?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true"/>
<constructor-arg index="7" type="boolean" value="true"/>
<constructor-arg index="8" ref="tomcatJdbcDataSourceFactory"/>
</bean>
<bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mapperLocations" value="classpath:mappers/*.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.qunar.flight.interb2b.airport.dict.dao" />
<property name="sqlSessionFactoryBeanName" value="sessionFactory" />
</bean>
這個Bean時,id不能為sqlSessionFactory,如果為這樣的話會導致MapperScannerConigurer在bean定義載入時,載入PropertyPlaceholderConfigurer還沒來得及替換定義中的變數