DelegatingFilterProxy 中的 NoSuchBeanDefinitionException

Posted 2023-02-27

【中文标题】DelegatingFilterProxy 中的 NoSuchBeanDefinitionException

【英文标题】：NoSuchBeanDefinitionException in DelegatingFilterProxy

【发布时间】：2016-12-27 14:41:47

【问题描述】：

我正在使用 spring mvc 开发 Web 应用程序。我想将 spring bean 注入到我的 Servlet 过滤器中。

我参考了这个教程http://www.deadcoderising.com/2015-05-04-dependency-injection-into-filters-using-delegatingfilterproxy/

以下是我的文件列表

    @Component("auditFilter")
    public class AuditFilter implements Filter 

        @Autowired
        private AuditHandler auditHandler;

        public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException 
            System.out.println("do filter");
            auditHandler.auditRequest(req);
            chain.doFilter(req, res);
        

        public void init(FilterConfig filterConfig) throws ServletException 
        

        public void destroy() 
        
    

@Component("auditHandler")
public class AuditHandler 

    public void auditRequest(ServletRequest request) 
        System.out.println("Received request from " + request.getRemoteAddr());
    


@Controller
public class HomeController 

    private static final Logger logger = LoggerFactory.getLogger(HomeController.class);

    /**
     * Simply selects the home view to render by returning its name.
     */
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String home(Locale locale, Model model) 
        logger.info("Welcome home! The client locale is .", locale);

        Date date = new Date();
        DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);

        String formattedDate = dateFormat.format(date);

        model.addAttribute("serverTime", formattedDate );

        return "home";
    

servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.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.xsd">

    <!-- DispatcherServlet Context: defines this servlet's request-processing 
        infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />

    <context:component-scan base-package="com.xyz.springtest" />

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving 
        up static resources in the $webappRoot/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources 
        in the /WEB-INF/views directory -->
    <beans:bean


class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <beans:property name="prefix" value="/WEB-INF/views/" />
            <beans:property name="suffix" value=".jsp" />
        </beans:bean>
    </beans:beans>

web.xml

<?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">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/root-context.xml</param-value>
    </context-param>

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

    <!-- Processes application requests -->
    <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>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>  
        <filter-name>auditFilter</filter-name>
        <filter-class>
            org.springframework.web.filter.DelegatingFilterProxy
        </filter-class>
        <init-param>
            <param-name>appName</param-name>
            <param-value>di-example</param-value>
        </init-param>
    </filter>

</web-app>

当我启动我的应用程序时，我得到以下异常

SEVERE: Exception starting filter auditFilter
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'auditFilter' is defined
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:529)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1095)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:277)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1097)
    at org.springframework.web.filter.DelegatingFilterProxy.initDelegate(DelegatingFilterProxy.java:326)
    at org.springframework.web.filter.DelegatingFilterProxy.initFilterBean(DelegatingFilterProxy.java:236)
    at org.springframework.web.filter.GenericFilterBean.init(GenericFilterBean.java:194)
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4809)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5485)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

我错过了什么？

以下帖子对我没有帮助

@Autowired in DelegatingFilterProxy

How can I get a Spring bean in a servlet filter?

Spring Framework filter, bean not injected

Spring and @Autowired on a DelegatingFilterProxy

【问题讨论】：

你确定你的过滤器类在com.xyz.springtest包下吗？

@MaciejMarczuk 是的，是的

【参考方案1】：

你必须在'root-context.xml'中加载你的bean，它是加载应用程序上下文bean的地方。

你的 'servlet-context.xml' 加载 WebApplicationContext，所以在这里定义你的 mvc 控制器，如果你想访问应用程序范围的其他 bean，应该移动到你的根应用程序上下文。您的应用程序有一个根上下文，但可以有许多应用程序上下文（对于每个调度程序 servlet。）。 spring-servlet.xml 中的 bean 可以引用根应用上下文中的 bean，反之则不行

在'root-context.xml'中定义你的bean

【讨论】：

真的吗？ contextConfigLocation 不应该指向正确的 xml 文件吗？

@FlorianSchaetz docs.spring.io/spring-framework/docs/current/javadoc-api/org/… "Web 应用程序可以定义任意数量的 DispatcherServlet。每个 servlet 将在自己的命名空间中运行，使用映射、处理程序等加载自己的应用程序上下文。只有根应用程序上下文由 ContextLoaderListener 加载的内容（如果有）将被共享。”

在 root-context.xml 中定义 auditFilter 实例后，我能够获得它。但我没有得到我在'servlet-context.xml'中定义的bean

@Javadroider 你为什么不移动 移动你的'root-context.xml' @ 987654322@

spring-servlet.xml中的bean可以引用root-context.xml中的bean，反之则不行。