使用Spring 3的@value简化配置文件的读取

<bean id="appProperty"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <array>
            <value>classpath:app.properties</value>
        </array>
    </property>
</bean>

@Value("${chengmi_crawl_timer_enable}")
private Boolean timerEnabled;