PropertyPlaceholderConfigurer 配置 加载 properties 文件

xml

<!-- 写法1 -->
<bean id="mappings"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

        <!-- typed as a java.util.Properties -->
        <property name="properties">
            <value>
                jdbc.driver.className=com.mysql.jdbc.Driver
                jdbc.url=jdbc:mysql://localhost:3306/mydb
            </value>
        </property>
        <property name="location">
            <value>
                /*.properties
            </value>
        </property>
</bean>
<!-- 写法二 -->
<context:property-placeholder location="classpath:*.properties"/>