java - 如何共享 2 上下文的属性占位符

Question

我在 Spring 3.2.4 上安装了 Spring MVC Web 应用程序。 我有 2 个上下文。 1. mvc-dispatcher-servlet.xml 如下所示:

<context:annotation-config/>
    <context:component-scan base-package="com.ja.dom"/>

    <!-- Tiles 3 config -->

    <bean class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <!--Don't add suffix or prefix like you do with .jsp files-->
        <property name="viewClass" value="org.springframework.web.servlet.view.tiles3.TilesView"/>
    </bean>

    <bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles3.TilesConfigurer" >
        <property name="definitions">
            <value>/WEB-INF/tiles.xml</value>
        </property>
    </bean>

和 2. root-context.xml 像这样:

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

 <!-- Mail Sender Bean -->

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
     <property name="host" value="smtp.gmail.com" />
     <property name="port" value="587" />
     <property name="username" value="${email.name}" />
     <property name="password" value="${email.password}" />
     <property name="defaultEncoding" value="UTF-8"/>

     <property name="javaMailProperties">
         <props>
             <prop key="mail.smtp.auth">true</prop>
             <prop key="mail.smtp.starttls.enable">true</prop>
             <prop key="mail.debug">true</prop>
         </props>
     </property>
 </bean>

当我运行应用程序时，我看到只有 mailSender bean 具有来自属性文件的参数。 我的其他 bean 等 @Service .. 未被注入(inject)。怎么了？ 如何将我的 PropertyPlaceholderConfigurer 共享到 mvc-dispatcher-servlet 上下文？

我像这样在 Service 上注入(inject)属性:

@Value("${reCaptcha.private.key}") private String reCaptchaPrivateKey;

和我的 web.xml (更新)

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    <display-name>Spring MVC Application</display-name>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/root-context.xml</param-value>
    </context-param>

    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--<init-param>-->
            <!--<param-name>contextConfigLocation</param-name>-->
            <!--<param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>-->
        <!--</init-param>-->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>




    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

Answer 1

我认为问题在于

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

相反，您应该使用 PropertySourcesPlaceholderConfigurer

<context:property-placeholder location="classpath:prop.properties" />

哪个

From Spring 3.1 onward, the XML will no longer register the old PropertyPlaceholderConfigurer but the newly introduced PropertySourcesPlaceholderConfigurer. This replacement class was created be more flexible and to better interact with the newly introduced Environment and PropertySource mechanism; it should be considered the standard for 3.1 applications.