错误信息：
org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 23 in XML document from class path resource [applicationContext.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 23; columnNumber: 106; cvc-elt.1: 找不到元素 'beans' 的声明。
<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:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">-->
xmlns="http://www.springframework.org/schema/beans"
在xsi:schemaLocation中没有，对应的 xsd 解析文件
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">-->
xmlns="http://www.springframework.org/schema/beans"
在xsi:schemaLocation中没有，对应的 xsd 解析文件
