我有两个项目，CarpoolDB 和 Carpool。
CarpoolDB : 包含后端的东西并且有
拼车应用程序上下文.xml
<context:annotation-config />
<context:component-scan base-package="com.onmobile" />
<context:property-placeholder location="classpath:server.properties" />
服务器属性
cm.db.driverClassName=com.mysql.jdbc.Driver
cm.db.url=jdbc:mysql://localhost:3306/carpool1
cm.db.username=abc
cm.db.password=xyz
我制作了一罐 carpoolDB 并放入 Carpool Application
拼车：包含 UI 事物和后端联系人 carpoolDB jar，并具有
carpool-application-context1.xml
<import resource="classpath:carpool-application-context.xml"/>
<context:annotation-config />
<context:component-scan base-package="com.onmobile.carpool.authentication" />
spring-servlet.xml
<context:property-placeholder location="classpath:carpool.properties" />
<context:annotation-config />
<context:component-scan base-package="com.onmobile.carpool.controller, com.onmobile.carpool.util" />
carpool.properties
cm.email.sender.mail.smtp.host=mail.on.com
现在，我有一个类 com.onmobile.carpool.util.EmailSender，它有一个属性 smtpHost，并希望 Spring 使用 @Value 注入该值，但它没有被注入。
@Controller
public class EmailSender {
public static final Log logger = LogFactory.getLog(EmailSender.class);
@Value("${cm.email.sender.mail.smtp.host}")
private String smtpHost;
}
我收到错误
java.lang.IllegalArgumentException: Could not resolve placeholder 'cm.email.sender.mail.smtp.host'
carpool.properties 存在于 src 文件夹中。
为什么它没有从 carpool.properties 文件中选择 cm.email.sender.mail.smtp.host。与 jar 文件中存在的属性文件是否有任何关系。
实际上，属性文件已加载，因为我在日志中看不到文件未找到但字段未自动连接。
删除导入后发布更新的完整配置文件
web.xml
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/carpool-application-context1.xml
/WEB-INF/applicationContext-security.xml
</param-value>
</context-param>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>
org.springframework.web.filter.DelegatingFilterProxy
</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/jsp/*</url-pattern>
</servlet-mapping>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<listener>
<listener-class>
org.springframework.security.web.session.HttpSessionEventPublisher
</listener-class>
</listener>
carpool-application-context1.xml
<!-- Configure annotated beans -->
<context:annotation-config />
<context:component-scan base-package="com.onmobile.carpooldb.db" />
<context:property-placeholder location="classpath:carpool.properties" />
<beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<beans:property name="driverClassName"><beans:value>${cm.db.driverClassName}</beans:value></beans:property>
<beans:property name="url"><beans:value>${cm.db.url}</beans:value></beans:property>
<beans:property name="username"><beans:value>${cm.db.username}</beans:value></beans:property>
<beans:property name="password"><beans:value>${cm.db.password}</beans:value></beans:property>
<beans:property name="testOnBorrow"><beans:value>true</beans:value></beans:property>
<beans:property name="testOnReturn"><beans:value>true</beans:value></beans:property>
<beans:property name="validationQuery"><beans:value>select 1</beans:value></beans:property>
<beans:property name="maxIdle"><beans:value>-1</beans:value></beans:property>
<beans:property name="maxActive"><beans:value>-1</beans:value></beans:property>
<beans:property name="maxOpenPreparedStatements"><beans:value>-1</beans:value></beans:property>
<beans:property name="maxWait"><beans:value>30000</beans:value></beans:property>
</beans:bean>
//session factory bean and other configuration
spring-servlet.xml
<context:property-placeholder location="classpath:carpool.properties" />
<context:annotation-config />
<context:component-scan base-package="com.onmobile.carpool.authentication, com.onmobile.carpool.controller, com.onmobile.carpool.util" />
<!-- Declare a view resolver -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- one of the properties available; the maximum file size in bytes -->
<property name="maxUploadSize" value="100000"/>
</bean>
carpool.properties
cm.db.driverClassName=com.mysql.jdbc.Driver
cm.db.url=jdbc:mysql://localhost:3306/carpool
cm.db.username=abc
cm.db.password=xyz
user.profile.pic.base.folder=D:\\carpoolRepository\\carpoolProfilePicUpload
google.places.autocomplete.response.xml.base.folder=D:\\carpoolRepository\\googleMapXML
#EMAIL - FORGOT PASSWORD
cm.email.sender.mail.smtp.host=mail.on.com
我试图在上面提到的 EmailSender“smtpHost”属性方式中注入 cm.email.sender.mail.smtp.host 的值，当我读到它时它显示为 null。其他属性（如 cm.db.driverClassName 等）会正确注入 carpool-application-context1.xml。
我正在附加包含配置文件位置的快照