spring-servlet.xml配置中报错：
The prefix "tx" for element "tx:advice" is not bound
解决办法：
在配置文件中加：xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
和
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
Attribute name "http:" associated with an element type "beans" must be followed by the ' = ' character.
原因：spring-aop.xsd后多了一个引号
