spring使用context-property-placeholder载不进属性问题

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环境：spring3.1.1+mybatis3.2.8+mybatis-spring1.2.3

今天整合了SpringMVC + MyBatis，发现了一个问题，在这里做个记录，各位如果遇到相同的问题，可以参考下。

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<context:property-placeholder location="classpath:prop/jdbc.properties" />

引入文件时出现下面的错误，提示dataSource中的使用资源文件中key对应的value值没有引入进来。

### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class '${jdbc.driver}'] with root cause
java.lang.ClassNotFoundException: ${jdbc.driver}

首先确认jdbc.properties引入的路径没有问题。其次往下看。

解决案：

1. xml 头部将 default-autowire="byName"去掉。

2. 修改SqlSessionFactory。

将

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<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="dataSource" ref="dataSource" />

<property name="mapperLocations" value="classpath*:maper/*.map.xml" />

</bean>

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

<property name="basePackage" value="org.com.mars.dao" />

</bean>

改成：

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<bean id="mySqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="dataSource" ref="dataSource" />

<property name="mapperLocations" value="classpath*:maper/*.map.xml" />

</bean>

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

<property name="basePackage" value="org.com.mars.dao" />

<property name="sqlSessionFactoryBeanName" value="mySqlSessionFactory" />//value不能是ref，ref也会报错

</bean>

这样，dataSource中就可以正常使用.properties文件中的key-value了。

附：完整的配置文件，这个文件是用来完成spring和mybatis的整合的xml。

spring-resources.xml

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<?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:p="http://www.springframework.org/schema/p"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:aop="http://www.springframework.org/schema/aop"

xsi:schemaLocation="

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/tx

http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.0.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-3.2.xsd"

default-autowire="byName" default-lazy-init="false">

<context:component-scan base-package="org.com.mars">

<context:exclude-filter type="regex"

expression="org.com.mars.controller.*" />

</context:component-scan>

<context:property-placeholder location="classpath:prop/jdbc.properties" />

<bean id="transactionManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dataSource" />

</bean>

<aop:config>

<aop:advisor pointcut="execution(* org.com.mars.service..*.*(..))"

advice-ref="myAdvice" />

</aop:config>

<tx:advice id="myAdvice" transaction-manager="transactionManager">

<tx:attributes>

<tx:method name="find*" propagation="SUPPORTS" read-only="true" />

<tx:method name="query*" propagation="SUPPORTS" read-only="true" />

<tx:method name="list*" propagation="SUPPORTS" read-only="true" />

<tx:method name="create*" propagation="REQUIRED" />

<tx:method name="save*" propagation="REQUIRED" />

<tx:method name="modify*" propagation="REQUIRED" />

<tx:method name="update*" propagation="REQUIRED" />

<tx:method name="delete*" propagation="REQUIRED" />

<tx:method name="*" propagation="SUPPORTS" read-only="true" />

</tx:attributes>

</tx:advice>

<bean id="mySqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="dataSource" ref="dataSource" />

<property name="mapperLocations" value="classpath*:maper/*.map.xml" />

</bean>

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

<property name="basePackage" value="org.com.mars.dao" />

<property name="sqlSessionFactoryBeanName" value="mySqlSessionFactory" />

</bean>

<tx:annotation-driven />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"

destroy-method="close">

<property name="driverClassName" value="${jdbc.driver}" />

<property name="url" value="${jdbc.url}" />

<property name="username" value="${jdbc.username}" />

<property name="password" value="${jdbc.password}" />

<property name="maxActive" value="${dbcp.maxActive}" />

<property name="maxIdle" value="${dbcp.maxIdle}" />

<property name="defaultAutoCommit" value="false" />

<property name="timeBetweenEvictionRunsMillis" value="3600000" />

<property name="minEvictableIdleTimeMillis" value="3600000" />

</bean>

</beans>

jdbc.properties

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##jdbc

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8

jdbc.username=root

jdbc.password=root

#dbcp settings

dbcp.initialSize=5

dbcp.maxActive=20

dbcp.maxIdle=10

jdbc.dbType=mysql

感谢热心的前辈技术分享！本文如有不正，请指出。

参考资料：
http://www.oschina.net/question/188964_32305

以上。

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