Java SpringMVC服务bean加载了两次

我的SpringMVC应用程序有一个问题，我的@Service类被创建了两次。我发现很少有线程讨论这个问题，而且大部分时间都与在应用程序和Servlet上下文中定义

有关。但在我的例子中，所有配置都在应用程序上下文文件中，Servlet上下文conf文件为空。我包括

web.xml

和

applicationContext.xml

文件

applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:task="http://www.springframework.org/schema/task"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">

    <tx:annotation-driven />        
    <mvc:annotation-driven />
    <task:annotation-driven />
    <context:component-scan base-package="my.app" />
    <mvc:resources mapping="/resources/**" location="/resources/" />
    <mvc:resources mapping="/assets/**" location="/WEB-INF/assets/" />
    <mvc:resources mapping="/webjars/**" location="classpath:/META-INF/resources/webjars/"/>

    <bean id="templateResolver"
        class="org.thymeleaf.templateresolver.ServletContextTemplateResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".html" />
        <property name="characterEncoding" value="UTF-8" />
        <property name="templateMode" value="HTML5" />
        <property name="cacheable" value="false" />
    </bean>
    <bean id="templateEngine" class="org.thymeleaf.spring3.SpringTemplateEngine">
        <property name="templateResolver" ref="templateResolver" />
        <property name="additionalDialects">
        <set>
          <bean class="org.thymeleaf.extras.springsecurity3.dialect.SpringSecurityDialect"/>
        </set>
        </property>
    </bean>
    <bean class="org.thymeleaf.spring3.view.ThymeleafViewResolver">
        <property name="templateEngine" ref="templateEngine" />
        <property name="characterEncoding" value="UTF-8" />
        <property name="order" value="1" />
        <property name="viewNames" value="thymeleaf/*" />
    </bean>

      <mvc:interceptors>
        <!-- Changes the locale when a 'locale' request parameter is sent; e.g. 
        /?locale=de -->
        <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
      </mvc:interceptors>
      <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
        <property name="cookieName" value="myCookie" />
        <property name="defaultLocale" value="sk_SK" />
      </bean>


    <import resource="spring/spring-security.xml"/>     
    <import resource="spring/data-source.xml" />
    <import resource="spring/lang-source.xml"/>
    <import resource="spring/data-properties.xml"/>
    <import resource="spring/data-managers.xml" />
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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_2_5.xsd">

    <session-config>
        <session-timeout>300</session-timeout>
    </session-config>

    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>  

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

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>SetCharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <!-- Spring Security -->
    <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>

</web-app>

web.xml

<?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:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:task="http://www.springframework.org/schema/task"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">

    <tx:annotation-driven />        
    <mvc:annotation-driven />
    <task:annotation-driven />
    <context:component-scan base-package="my.app" />
    <mvc:resources mapping="/resources/**" location="/resources/" />
    <mvc:resources mapping="/assets/**" location="/WEB-INF/assets/" />
    <mvc:resources mapping="/webjars/**" location="classpath:/META-INF/resources/webjars/"/>

    <bean id="templateResolver"
        class="org.thymeleaf.templateresolver.ServletContextTemplateResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".html" />
        <property name="characterEncoding" value="UTF-8" />
        <property name="templateMode" value="HTML5" />
        <property name="cacheable" value="false" />
    </bean>
    <bean id="templateEngine" class="org.thymeleaf.spring3.SpringTemplateEngine">
        <property name="templateResolver" ref="templateResolver" />
        <property name="additionalDialects">
        <set>
          <bean class="org.thymeleaf.extras.springsecurity3.dialect.SpringSecurityDialect"/>
        </set>
        </property>
    </bean>
    <bean class="org.thymeleaf.spring3.view.ThymeleafViewResolver">
        <property name="templateEngine" ref="templateEngine" />
        <property name="characterEncoding" value="UTF-8" />
        <property name="order" value="1" />
        <property name="viewNames" value="thymeleaf/*" />
    </bean>

      <mvc:interceptors>
        <!-- Changes the locale when a 'locale' request parameter is sent; e.g. 
        /?locale=de -->
        <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
      </mvc:interceptors>
      <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
        <property name="cookieName" value="myCookie" />
        <property name="defaultLocale" value="sk_SK" />
      </bean>


    <import resource="spring/spring-security.xml"/>     
    <import resource="spring/data-source.xml" />
    <import resource="spring/lang-source.xml"/>
    <import resource="spring/data-properties.xml"/>
    <import resource="spring/data-managers.xml" />
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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_2_5.xsd">

    <session-config>
        <session-timeout>300</session-timeout>
    </session-config>

    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>  

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

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>SetCharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <!-- Spring Security -->
    <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>

</web-app>

300
appServlet
org.springframework.web.servlet.DispatcherServlet
上下文配置位置
/WEB-INF/spring/appServlet/servlet-context.xml
0
org.springframework.web.context.ContextLoaderListener
appServlet
/
SetCharacterEncodingFilter
org.springframework.web.filter.CharacterEncodingFilter
编码
UTF-8
强制编码
真的
springSecurityFilterChain
org.springframework.web.filter.DelegatingFilterProxy
springSecurityFilterChain
/*

如果您使用spring mvc。您的应用程序中将有两个上下文。基于applicationContext.xml和appServlet servlet.xml（名称基于servlet名称appServlet）的spring上下文

当spring上下文初始化时，它将对applicationContext.xml中定义的包进行组件扫描。这是您第一次创建服务。 然后，当您使用DispatcherServlet时，它将创建一个spring上下文。如果您有appServlet-servlet.xml，它就是基于此。否则，它将对所有类路径进行组件扫描。这是您的服务第二次创建

如果不需要，可以在applicationContext.xml中编写：

<context:component-scan base-package="my.app">
    <context:exclude-filter type="annotation"expression="org.springframework.stereotype.Controller" />
</context:component-scan>

然后您应该创建appServlet-servlet.xml并编写如下组件扫描：

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

---

因此，您可以在spring上下文中保存所有组件和服务。spring mvc将只保留控制器。

它是真的空的还是正在导入配置？还要确保您没有在代码中自己创建上下文实例。只是想知道如何检查复制bean的创建？当使用基于类的代理时，看起来好像创建了重复的实例……是的，servlet conf是空的，没有导入。我正在自动连接代码中的所有服务bean，因此没有额外的实例创建。我使用日志记录服务，这是我所知道的双重性。我确信日志实现不是问题，因为我看到一些业务方法也会执行两次。没有理由当有两个实例时，一个方法也会执行两次（除非您使用的调度程序也会启动两次）。那么loggin的问题不在吗？我也没有提到创建实例，而是创建了一个

ApplicationContext

。你的

web.xml

旁边没有

WebApplicationInitializer

？如果你的

servlet context.xml

是空的，那为什么还要有一个xml文件呢。在此处指定空的

时，它将构造一个空的

ApplicationContext

。OP已声明由

DispatcherServlet

加载的上下文为空，因此它不加载任何内容。其次，您的代码有缺陷，因为由DispatcherServlet加载的代码应该包含一个

使用默认过滤器=“false”

，因为此时它正在扫描所有内容。如果它没有加载任何内容，所有控制器将无法处理该请求。所以我认为是组件扫描它的包来创建控制器。不，不是，它扫描所有东西，不仅仅是控制器。应用程序上下文将使它扫描所有东西，当然包含控制器。但此时DispatcherServlet无法获取控制器。因此，处理请求将不起作用。我认为OP可以让web应用程序正常工作。因此，必须使用mvc sacn包才能获得控制器。如果它也扫描服务呢？OP的问题是加载两次bean。您发布的代码将导致重复加载除

@Controller

之外的所有bean。这将造成严重破坏，尤其是如果根目录中有

或类似文件。突然之间没有交易。