Caused by: org.xml.sax.SAXParseException; lineNumber: 9; columnNumber: 61; cvc-complex-type.2.4.c: 通配符的匹配很全面, 但无法找到元素 'context:property-placeholder' 的声明。

解决方案：applicationContext.xml

在applicationContext.xml中配置context环境

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">