The prefix "context" for element "context:property-placeholder" is not bound.

1.applicationContext.xml 中beans声明部分   添加xmlns:context="http://www.springframework.org/schema/context"

2.xsi:schemaLocation 后添加 

http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd">