beans.xml配置：
<beans xmlns=”http://www.springframework.org/schema/beans”
xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
xmlns:aop=”http://www.springframework.org/schema/aop”
xsi:schemaLocation=”http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2xsd”>
<aop:aspectj-autoproxy/>
</beans>
报错：
警告: Ignored XML validation warning
org.xml.sax.SAXParseException: schema_reference.4: Failed to read schema document “”http://www.springframework.org/schema/aop/spring-aop-3.2xsd””, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
