在使用spring构建项目中，将db配置与程序jar包分离的一种方式

<beans>
<bean id="test.propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="order" value="1" />
<property name="locations">
<list>
<value>classpath:db.properties</value>
<value>classpath:log4j.properties</value>
</list>
</property>
<property name="placeholderPrefix" value="$[" />
<property name="placeholderSuffix" value="]" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
<property name="ignoreResourceNotFound" value="true" />
</bean>
<bean id="datasource"
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="$[db.test.driver]" />
<property name="url" value="$[db.test.url]" />
<property name="username" value="$[db.test.username]" />
<property name="password" value="$[db.test.password]" />
</bean>
</beans>

db_config=/app/config
app_lib_path=/app/app.jar
CLASSPATH=$CLASSPATH:$db_config:$app_lib_path
echo "classpath is ---"$CLASSPATH;
JAVA_CMD=/usr/bin/java
main_class=a.b.c.AppMain
$JAVA_CMD -Xms2G -Xmx4G  -classpath $CLASSPATH ${main_class}