java - Spring MVC RequestMappingHandlerMapping 在应用程序启动时发生两次

Question

我最近将 Spring 4 MVC Web 应用程序从 XML 配置转换为基于 java 的配置。这样做之后，所有 Controller 都被映射两次。我觉得这与组件扫描有关，但我无法弄清楚为什么。如果有帮助的话，我可以发布旧的 XML 配置设置。该应用程序工作正常，它只是在日志中打印 Controller 映射两次。

这里它们被加载到根上下文

...
INFO  RequestMappingHandlerMapping - Mapped "{[/user/changePassword],methods=[POST]}" onto public org.springframework.web.servlet.ModelAndView com.rapidtest.mvc.controller.UserController.changePasswordSubmit(com.rapidtest.mvc.form.user.ChangePasswordFormBean,org.springframework.validation.BindingResult) throws java.lang.Exception
INFO  SimpleUrlHandlerMapping - Mapped URL path [/pub/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
INFO  SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler]
INFO  RequestMappingHandlerAdapter - Looking for @ControllerAdvice: Root WebApplicationContext: startup date [Thu Oct 22 16:16:24 MDT 2015]; root of context hierarchy

这里它们也被加载到消息调度程序上下文中

...
INFO  RequestMappingHandlerMapping - Mapped "{[/user/changePassword],methods=[POST]}" onto public org.springframework.web.servlet.ModelAndView com.rapidtest.mvc.controller.UserController.changePasswordSubmit(com.rapidtest.mvc.form.user.ChangePasswordFormBean,org.springframework.validation.BindingResult) throws java.lang.Exception
INFO  SimpleUrlHandlerMapping - Mapped URL path [/pub/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
INFO  SimpleUrlHandlerMapping - Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler]
INFO  RequestMappingHandlerAdapter - Looking for @ControllerAdvice: WebApplicationContext for namespace 'website-servlet': startup date [Thu Oct 22 16:16:28 MDT 2015]; parent: Root WebApplicationContext

这是我的 web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">

    <servlet>
        <servlet-name>website</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextClass</param-name>
            <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
        </init-param>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>com.rapidtest.config.mvc.MVCConfig</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

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

    <context-param>
      <param-name>contextClass</param-name>
      <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
    </context-param>
    <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>com.rapidtest.config.spring</param-value>
    </context-param>
    <context-param>
        <param-name>contextInitializerClasses</param-name>
        <param-value>com.rapidtest.util.properties.ArchaiusPropertyInitializer</param-value>
    </context-param>

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

    <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>
        <dispatcher>REQUEST</dispatcher>
        <dispatcher>ERROR</dispatcher>
    </filter-mapping>

    <filter>
        <filter-name>EncodingFilter</filter-name>
        <filter-class>com.rapidtest.web.filter.EncodingFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
    </welcome-file-list>

    <error-page>
        <error-code>404</error-code>
        <location>/error/404</location>
    </error-page>

    <error-page>
        <location>/error/general</location>
    </error-page>

</web-app>

这是我的 java MVC 配置

package com.rapidtest.config.mvc;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled=true)
@ComponentScan("com.rapidtest.mvc.controller")
public class MVCConfig extends WebMvcConfigurationSupport {

    // <mvc:resources mapping="/pub/**" location="/pub/" />
    @Override
    public void addResourceHandlers(final ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/pub/**").addResourceLocations("/pub/");
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    //  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    //      <property name="prefix">
    //          <value>/WEB-INF/jsp/</value>
    //      </property>
    //      <property name="suffix">
    //          <value>.jsp</value>
    //      </property>
    //  </bean>
    @Bean
    public ViewResolver configureViewResolver() {
        InternalResourceViewResolver viewResolve = new InternalResourceViewResolver();
        viewResolve.setPrefix("/WEB-INF/jsp/");
        viewResolve.setSuffix(".jsp");

        return viewResolve;
    }

    // <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
    @Bean(name = "multipartResolver")
    public CommonsMultipartResolver getMultipartResolver() {
        return new CommonsMultipartResolver();
    }

}

这是我的 RootConfig。我的所有其他 @Configuration 类都在同一个包中。

package com.rapidtest.config.spring;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;

import com.rapidtest.util.properties.ArchaiusPropertyPlaceholderConfigurer;

@Configuration
//@ComponentScan(basePackages = {"com.rapidtest"}, useDefaultFilters=false, excludeFilters={
//        @ComponentScan.Filter(type=FilterType.ANNOTATION, value={Controller.class, ControllerAdvice.class})})
@ComponentScan(basePackages = {"com.rapidtest"} )
public class RootConfig {

    //<bean id="propertyConfigurer" class="com.rapidtest.util.properties.ArchaiusPropertyPlaceholderConfigurer" />
    @Bean(name = "propertyConfigurer")
    public static ArchaiusPropertyPlaceholderConfigurer getPropertyPlaceholder() {
        return new ArchaiusPropertyPlaceholderConfigurer();
    }
}

Answer 1

这个

@ComponentScan(basePackages = {"com.rapidtest"} )

在您的RootConfig中扫描所有带有前缀com.rapidtest的包。

您的MVCConfig类位于包com.rapidtest.config.mvc中。因此，它也会被 ContextLoaderListener 加载的 RootConfig 拾取并初始化。

隔离您的包裹，以免发生这种情况。