spring和mybatis整合加载jdbc.properties异常

使用mybatis时，如果映射器比较多的时候，采用xml配置就比较低效，这时可以采用MapperScannerConfigurer扫描指定的包，进行配置。

版本：spring 3.2.4 +mybatis3.2.2

package com.lzf;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

public interface Mapper {
@Select("SELECT forum_id,forum_name, forum_desc FROM t_forum  where id=#{userId}")
t_forum getT_forums(@Param("userId") long userId);
}

配置文件 applicationcontext.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> 
<import resource="classpath:/mybatis.xml"/>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
p:dataSource-ref="dataSource" />
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"
p:dataSource-ref="dataSource">
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.lzf"></property>
</bean>
</beans>

jdbc数据库配置xml文件

<?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:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/util http://www.springframework.org/schema/util/spring-util-3.1.xsd"> <util:properties id="dataSourceProps" location="classpath:/config/jdbc.properties"/>
<bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource" >
<property name="driver" value="#{dataSourceProps['jdbc.class']}"/>
<property name="driverUrl" value="#{dataSourceProps['jdbc.url']}"/>
<property name="user" value="#{dataSourceProps['jdbc.username']}"/>
<property name="password" value="#{dataSourceProps['jdbc.password']}"/>
<property name="verbose" value="#{dataSourceProps['jdbc.debug']}"/>
<property name="trace" value="#{dataSourceProps['jdbc.debug']}"/>
<property name="delegateProperties" value="user=#{dataSourceProps['jdbc.username']},password=#{dataSourceProps['jdbc.password']}"/>
<property name="alias" value="#{dataSourceProps['proxool.alias']}"/>
<property name="maximumConnectionCount" value="#{dataSourceProps['proxool.max.conn']}"/>
<property name="minimumConnectionCount" value="#{dataSourceProps['proxool.min.conn']}"/>
<property name="prototypeCount" value="#{dataSourceProps['proxool.prototype.count']}" />
</bean>
</beans>

这里使用spring的<util:properties id="dataSourceProps"> 加载指定的jdbc.properties，因为是org.springframework.beans.factory.config.PropertyPlaceholderConfigurer加载属性比org.mybatis.spring.mapper.MapperScannerConfigurer慢

如果不使用<util:properties> 会抛出找不到${jdbc.class}，找不到${jdbc.Url}等，也可以使用其他的方式，我没有试过

jdbc.properties

jdbc.class=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/demo?characterEncoding=UTF-8
jdbc.username=root
jdbc.password=root
jdbc.debug=false
proxool.alias=MAIN_POOL
proxool.house.keeping.sleep.time=3000000
proxool.max.conn=30
proxool.min.conn=10
proxool.max.new.conn=20
proxool.max.conn.lifetime=30000
proxool.prototype.count=10

测试

package com.lzf.test;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.lzf;
import com.lzf.t_forum;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"/applicationContext.xml"})
public class test {

@Autowired
Mapper mapper;
@Test
public void mybaits()
{
t_forum tforum=mapper.getT_forums(1l);
}
}