Spring嘗試兩次@Autowire我的依賴項

Question

我有一個Spring MVC應用程序，其中我試圖在帶有@Controller注釋的類中使用@Autowired。 在沒有@Controller批注的類中，@Autowired可以正常工作，一旦我添加@Controller批注，就會在啟動時獲得巨大的No qualifying bean of type [com.fasterxml.jackson.databind.ObjectMapper] found for dependency其主要歸結為No qualifying bean of type [com.fasterxml.jackson.databind.ObjectMapper] found for dependency

我感覺到Spring試圖自動關聯兩次依賴關系？ 我將進一步證明我的問題...

在我的web.xml ，我同時加載了contextConfigLocation和DispatcherServlet：

....

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:META-INF/spring/applicationContext.xml</param-value>
</context-param>

....

<servlet>
    <servlet-name>ahpw-api</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/spring/webmvc-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>ahpw-api</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

....

webmvc-config.xml僅包含允許我打開Jackson JSON API的基本知識：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd                 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd                 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">

    <context:component-scan base-package="com.ahpw.api" use-default-filters="false">
        <context:include-filter expression="org.springframework.stereotype.Controller" type="annotation"/>
    </context:component-scan>

    <mvc:default-servlet-handler/>

    <mvc:annotation-driven/>

    <!-- Cookies Filter to set cookies on JSON AJAX responses -->
    <mvc:interceptors>
        <bean id="cookieInterceptor" class="com.ahpw.api.controller.COOKIEFilter"/>
    </mvc:interceptors>

</beans>

在我的applicationContext.xml中，我具有以下內容：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
           http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd">

    <context:property-placeholder location="classpath*:META-INF/spring/*.properties"/>

    <context:spring-configured/>

    <context:component-scan base-package="com.ahpw.api" use-default-filters="false">
        <context:include-filter expression="org.springframework.stereotype.Service" type="annotation"/>
    </context:component-scan>

    <!-- Setup Jackson instance -->
    <bean id="jackson" class="com.fasterxml.jackson.databind.ObjectMapper" />

    <!-- Setup RabbitMQ -->
    <bean id="nativeConnectionFactory" class="com.rabbitmq.client.ConnectionFactory">
        <property name="connectionTimeout" value="${rabbit.connection.timeout}"/>
        <property name="requestedHeartbeat" value="${rabbit.heartbeat}"/>
    </bean>
    <rabbit:connection-factory
            id="connectionFactory"
            port="${rabbit.port}"
            virtual-host="${rabbit.virtual}"
            host="${rabbit.host}"
            username="${rabbit.username}"
            password="${rabbit.password}"
            connection-factory="nativeConnectionFactory"/>
    <rabbit:admin connection-factory="connectionFactory"/>
    <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" reply-timeout="${rabbit.rpc.timeout}" />


</beans>

發生沖突的我的班級是這樣開始的：

@Service
@Controller
@RequestMapping("/auth")
@JsonIgnoreProperties(ignoreUnknown = true)
public class AuthenticationController extends AbstractRPCPublisher<AuthenticationRequest, AuthenticationResponse> {

    @Autowired
    AmqpTemplate template;

    @Autowired
    ObjectMapper mapper;

如果我刪除@Controller，一切正常，但顯然/auth的請求映射停止工作。

如果我放回@Controller並在webmvc-config.xml復制jackson bean和rabbitMQ好東西，它會啟動而不會出現錯誤，但這意味着每個資源都有兩個實例，即WEB-INF和META- INF，不可取。

有沒有辦法通過webmvc-config.xml實例化我的控制器，但告訴它忽略@Autowired，以便我的applicationContext可以照顧它們，如果可以，@ Autowire是否可以正常運行？

Answer 1

您必須定義ContextLoaderListener偵聽器，該偵聽器將創建Web應用程序的根上下文並在<context-param>標記中加載contextConfigLocation定義：

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

因此，在applicationContext.xml程序上下文中定義的bean將可用於webmvc-config.xml應用程序上下文。

我不知道這是否是一個錯字，但是AuthenticationController類一定不能用@Service注釋， @Service @Controller就足夠了。