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spring 3.0 后提供了注解配置引入，<context:property-placeholder/>，方便。但是往往第一次使用時(shí)會(huì )遇到此屬性配置進(jìn)applicationContext.xml文件中，會(huì )出現紅叉：
“The prefix "context" for element "context:property-placeholder" isnot bound. ”

只需要在文件頭中引入：xmlns:context="http://www.springframework.org/schema/context"即可。
舉例如下：
<?xml version="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:context="http://www.springframework.org/schema/context"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="dataSource"
       class="com.mchange.v2.c3p0.ComboPooledDataSource"destroy-method="close">
   <property name="driverClass"value="${jdbc.driverClassName}"/>
   <property name="jdbcUrl"value="${jdbc.url}"/>
   <property name="user"value="${jdbc.username}"/>
   <property name="password"value="${jdbc.password}"/>
</bean>

<context:property-placeholderlocation="classpath:jdbc.properties"/>
</beans>


jdbc.properties：
#jdbc配置
jdbc.driverClassName = oracle.jdbc.driver.OracleDriver
jdbc.url = jdbc:oracle:thin:@//localhost:1521/orcl
jdbc.username =  scotter
jdbc.password =  123