相同Bean分別被Spring MVC子容器與Spring父容器初始化，致使@Value注入失敗
#1 問題描述# 在車保養項目開發過程當中，技術架構：Spring MVC + MyBatis；Service層接口中屬性，若是使用註解@Value注入，不可以拿到Properties文件中拿到對應的key值；但在Spring配置文件applicationContext-xxx.xml文件中配置的Properties就能夠拿到。具體項目中相關代碼以下：html
- Spring MVC的dispatcher-servlet.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 自定義的參數解析器放在第一位置 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<!-- 自定義參數解析器 -->
<property name="customArgumentResolvers">
<list>
<bean class="com.qding.base.resolver.ArgumentFromJsonResolver" />
</list>
</property>
</bean>
<!-- 開啓組件掃描 -->
<!-- 對包中的全部類進行掃描，以完成Bean建立和自動依賴注入的功能 -->
<context:component-scan base-package="com.qding"/>
<!-- 開啓註解 -->
<mvc:annotation-driven />
<!-- 啓用AspectJ對Annotation的支持 -->
<aop:aspectj-autoproxy proxy-target-class="true"/>
<!-- 靜態資源路徑 -->
<mvc:resources location="/easyui/" mapping="/easyui/**"/>
<mvc:resources location="/js/" mapping="/js/**"/>
<mvc:resources location="/html/" mapping="/html/**"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置多請求數據類型，如json xml-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- set the max upload size10MB -->
<property name="defaultEncoding" value="UTF-8" />
<property name="maxUploadSize" value="10485760" />
<property name="maxInMemorySize" value="10240" />
</bean>
<!-- 配置Controller攔截器 -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**" />
<mvc:exclude-mapping path="/remote/imessage"/>
<mvc:exclude-mapping path="/easyui/**"/>
<mvc:exclude-mapping path="/js/**"/>
<mvc:exclude-mapping path="/html/**"/>
<bean class="com.qding.base.interceptor.TransferSecurityInterceptor"/>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**" />
<mvc:exclude-mapping path="/remote/imessage"/>
<mvc:exclude-mapping path="/easyui/**"/>
<mvc:exclude-mapping path="/js/**"/>
<mvc:exclude-mapping path="/html/**"/>
<bean class="com.qding.doc.interceptor.TransferDocInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
<!-- 切面配置：Controller方法參數校驗 -->
<bean class="com.qding.base.aspect.ParameterValidateAspect" />
</beans>
- Spring的applicationContext-service.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 開啓組件掃描 -->
<!-- 對包中的全部類進行掃描，以完成Bean建立和自動依賴注入的功能 -->
<context:component-scan base-package="com.qding.*.*.service"/>
<!-- 定時任務 -->
<task:annotation-driven/>
<!-- 啓用AspectJ對Annotation的支持 -->
<aop:aspectj-autoproxy/>
<!-- Transaction Support -->
<tx:advice id="useTxAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="*remove*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception"/>
<tx:method name="*save*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="*modify*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="*update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="create*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="fill*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="cancel*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="*chang*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="find*" propagation="SUPPORTS"/>
<tx:method name="get*" propagation="SUPPORTS"/>
<tx:method name="query*" propagation="SUPPORTS"/>
<tx:method name="page*" propagation="SUPPORTS"/>
<tx:method name="count*" propagation="SUPPORTS"/>
</tx:attributes>
</tx:advice>
<!--把事務控制在Service層-->
<aop:config>
<aop:pointcut id="pc" expression="execution(public * com.qding..service.*.*(..))" />
<aop:advisor pointcut-ref="pc" advice-ref="useTxAdvice" />
</aop:config>
<!-- 切面配置：Service層方法執行日誌 -->
<bean class="com.qding.aspect.ServiceVersionLogAspect" />
<!--memcached客戶端配置-->
<bean name="xmemcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<constructor-arg>
<list>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>${server_1}</value>
</constructor-arg>
<constructor-arg>
<value>${port_1}</value>
</constructor-arg>
</bean>
</list>
</constructor-arg>
<constructor-arg>
<list>
<value>${priority_1}</value>
</list>
</constructor-arg>
<property name="connectionPoolSize" value="6"/>
<property name="commandFactory">
<bean class="net.rubyeye.xmemcached.command.BinaryCommandFactory"/>
</property>
<property name="sessionLocator">
<bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"/>
</property>
<property name="transcoder">
<bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
</property>
</bean>
<bean name="xmemcachedClient" factory-bean="xmemcachedClientBuilder" factory-method="build" destroy-method="shutdown">
<property name="opTimeout" value="3000"/>
</bean>
<bean id="memCacheUtil" class="com.qding.member.common.cache.MemCacheUtil">
<!-- 過時時間 單位秒 -->
<property name="expTime" value="3600"/>
<!-- 操做失效時間 單位毫秒 -->
<property name="opTime" value="3000"/>
<property name="memcachedClient" ref="xmemcachedClient"/>
</bean>
</beans>
- Service層OrderServiceImpl的代碼：
public class OrderServiceImpl implements OrderService {
@Value("${bopai.provider_id}")
private String bopaiProviderId;
@Value("${bopai.provider_name}")
private String bopaiProviderName;
@Value("${bopai.connect.phone}")
private String boPaiPhone;
......
}
#2 排查過程#java
- Spring的applicationContext-service.xml文件配置的屬性，能夠正常拿到Properties文件中的值；【正常】
- 項目工程的Service層OrderServiceImpl實現，@Value不能拿到Properties文件中的值；【不正常】
- 代碼斷點調試：發現OrderServiceImpl被初始化了兩次，第一次@Value能夠拿到值，第二次@Value沒有拿到值；【不正常】
- 發現根本緣由：Spring 容器和Spring MVC容器分別都初始化了Service的實例，後者第二次初始化Service實例時，沒有拿到@Value值，該實例覆蓋掉了Spring 容器初始化的實例；
#3 解決方案# 經過修改兩個配置文件的<context:component-scan base-package=""/>掃包範圍，達到如下效果：web
- Spring MVC的配置文件dispatcher-servlet嚴格限制只初始化Controller層實例；
- Spring的配置文件applicationContext-service.xml嚴格限制只初始化除Controller層的其餘層實例；
修改後的配置文件：spring
- Spring MVC的dispatcher-servlet.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 自定義的參數解析器放在第一位置 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<!-- 自定義參數解析器 -->
<property name="customArgumentResolvers">
<list>
<bean class="com.qding.base.resolver.ArgumentFromJsonResolver" />
</list>
</property>
</bean>
<!-- 開啓組件掃描 -->
<!-- 對包中的全部類進行掃描，以完成Bean建立和自動依賴注入的功能 -->
<context:component-scan base-package="com.qding.*.*.controller,com.qding.*.controller"/>
<!-- 開啓註解 -->
<mvc:annotation-driven />
<!-- 啓用AspectJ對Annotation的支持 -->
<aop:aspectj-autoproxy proxy-target-class="true"/>
<!-- 靜態資源路徑 -->
<mvc:resources location="/easyui/" mapping="/easyui/**"/>
<mvc:resources location="/js/" mapping="/js/**"/>
<mvc:resources location="/html/" mapping="/html/**"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置多請求數據類型，如json xml-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- set the max upload size10MB -->
<property name="defaultEncoding" value="UTF-8" />
<property name="maxUploadSize" value="10485760" />
<property name="maxInMemorySize" value="10240" />
</bean>
<!-- 配置Controller攔截器 -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**" />
<mvc:exclude-mapping path="/remote/imessage"/>
<mvc:exclude-mapping path="/easyui/**"/>
<mvc:exclude-mapping path="/js/**"/>
<mvc:exclude-mapping path="/html/**"/>
<bean class="com.qding.base.interceptor.TransferSecurityInterceptor"/>
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**" />
<mvc:exclude-mapping path="/remote/imessage"/>
<mvc:exclude-mapping path="/easyui/**"/>
<mvc:exclude-mapping path="/js/**"/>
<mvc:exclude-mapping path="/html/**"/>
<bean class="com.qding.doc.interceptor.TransferDocInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
<!-- 切面配置：Controller方法參數校驗 -->
<bean class="com.qding.base.aspect.ParameterValidateAspect" />
</beans>
- Spring的applicationContext-service.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 開啓組件掃描 -->
<!-- 對包中的全部類進行掃描，以完成Bean建立和自動依賴注入的功能 -->
<context:component-scan base-package="com.qding.*.*.service,com.qding.*.*.imessage,com.qding.*.quartz,com.qding.remote.service"/>
<!-- 定時任務 -->
<task:annotation-driven/>
<!-- 啓用AspectJ對Annotation的支持 -->
<aop:aspectj-autoproxy/>
<!-- Transaction Support -->
<tx:advice id="useTxAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="*remove*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception"/>
<tx:method name="*save*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="*modify*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="*update*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="create*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="fill*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="cancel*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="*chang*" propagation="REQUIRED" read-only="false" rollback-for="java.lang.Exception" />
<tx:method name="find*" propagation="SUPPORTS"/>
<tx:method name="get*" propagation="SUPPORTS"/>
<tx:method name="query*" propagation="SUPPORTS"/>
<tx:method name="page*" propagation="SUPPORTS"/>
<tx:method name="count*" propagation="SUPPORTS"/>
</tx:attributes>
</tx:advice>
<!--把事務控制在Service層-->
<aop:config>
<aop:pointcut id="pc" expression="execution(public * com.qding..service.*.*(..))" />
<aop:advisor pointcut-ref="pc" advice-ref="useTxAdvice" />
</aop:config>
<!-- 切面配置：Service層方法執行日誌 -->
<bean class="com.qding.aspect.ServiceVersionLogAspect" />
<!--memcached客戶端配置-->
<bean name="xmemcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<constructor-arg>
<list>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>${server_1}</value>
</constructor-arg>
<constructor-arg>
<value>${port_1}</value>
</constructor-arg>
</bean>
</list>
</constructor-arg>
<constructor-arg>
<list>
<value>${priority_1}</value>
</list>
</constructor-arg>
<property name="connectionPoolSize" value="6"/>
<property name="commandFactory">
<bean class="net.rubyeye.xmemcached.command.BinaryCommandFactory"/>
</property>
<property name="sessionLocator">
<bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"/>
</property>
<property name="transcoder">
<bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
</property>
</bean>
<bean name="xmemcachedClient" factory-bean="xmemcachedClientBuilder" factory-method="build" destroy-method="shutdown">
<property name="opTimeout" value="3000"/>
</bean>
<bean id="memCacheUtil" class="com.qding.member.common.cache.MemCacheUtil">
<!-- 過時時間 單位秒 -->
<property name="expTime" value="3600"/>
<!-- 操做失效時間 單位毫秒 -->
<property name="opTime" value="3000"/>
<property name="memcachedClient" ref="xmemcachedClient"/>
</bean>
</beans>
#4 問題總結# SpringMVC容器是Spring容器的一個子容器，它一樣可以初始化實體類。因爲SpringMVC容器的初始化是在Spring容器初始化以後，因此它會替換Spring中已經存在的類，這樣可能會致使衝突。所以在Spring的配置文件中SpringMVC和Spring容器各司其職，在使用ComponentScan進行掃描時，各自掃描各自的實體類。以下配置：express
- Spring容器掃描配置：
<context:component-scan base-package="com.projects.system">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>
- SpringMVC容器掃描配置：
<context:component-scan base-package="com.projects.system">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
</context:component-scan>
以上配置在使用Spring xml-based配置時是沒有問題的。若是在項目中引入java-base配置時，同時引入了@Configuration註解，@Configuration註解是在Spring容器初始化時進行實體類的初始化工做，所以在Spring MVC掃描配置中要將其過濾掉，不然會致使SpringMVC 的rest地址不可訪問的問題。新的配置以下：json
<context:component-scan base-package="com.projects.system">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Repository"/>
<!-- 不掃描配置文件類，避免重複初始化 -->
<context:exclude-filter type="annotation" expression="org.springframework.context.annotation.Configuration"/>
</context:component-scan>
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