spring中读取绝对路径与类路径的二种方式:
<bean id="propertyConfigurer"class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>/WEB-INF/mail.properties</value>
<value>classpath: conf/sqlmap/jdbc.properties</value>
</list>
</property>
</bean>