在导入相应包的情况下出现： 通配符的匹配很全面,但无法找到元素 ‘context:component-scan‘ 的声明
可能是xml文档的约束文件有问题，缺少两行
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd" # 注意版本号 >
