使用@Configuration注释WebSecurityConfigurerAdapter会导致两次调用config

当我创建一个时，WebSecurityConfigurerAdapter它将被注册两次。我已经创建了与参考文档中的“ Hello Web Security Java配置”示例完全相同的配置。

尽管Bean和过滤器链两次注册，如tomcat输出中所示，该配置仍按预期工作。

00:32:01 INFO : Root WebApplicationContext: initialization started
00:32:01 INFO : Refreshing Root WebApplicationContext: startup date [Thu Oct 09 00:32:01 EST 2014]; root of context hierarchy
00:32:01 INFO : Registering annotated classes: [class com.acme.app.config.SecurityConfig]
______________
00:32:02 INFO : Creating filter chain: org.springframework.security.web.util.matcher.AnyRequestMatcher@1, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@26eed435, org.springframework.security.web.context.SecurityContextPersistenceFilter@cd9947, org.springframework.security.web.header.HeaderWriterFilter@354e8394, org.springframework.security.web.csrf.CsrfFilter@54fb62e3, org.springframework.security.web.authentication.logout.LogoutFilter@1df9cd96, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@4da923c6, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@1ee94efd, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@7d4b5722, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@26dde6a8, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@7c58b660, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@6fd12384, org.springframework.security.web.session.SessionManagementFilter@24d4cc75, org.springframework.security.web.access.ExceptionTranslationFilter@1709e92c, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@2c46f137]
00:32:02 INFO : Root WebApplicationContext: initialization completed in 565 ms
00:32:02 INFO : FrameworkServlet 'dispatcher': initialization started
00:32:02 INFO : Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Thu Oct 09 00:32:02 EST 2014]; parent: Root WebApplicationContext
00:32:02 INFO : Registering annotated classes: [class com.acme.app.config.WebConfig]
______________
00:32:02 INFO : Creating filter chain: org.springframework.security.web.util.matcher.AnyRequestMatcher@1, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@52b26dcb, org.springframework.security.web.context.SecurityContextPersistenceFilter@10f4b535, org.springframework.security.web.header.HeaderWriterFilter@561ad054, org.springframework.security.web.csrf.CsrfFilter@4b6e4b62, org.springframework.security.web.authentication.logout.LogoutFilter@1d424a71, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@2dad3bf4, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@282a0f5c, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@52eeebb7, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@47d4a88e, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@474c5850, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@6fdc40f8, org.springframework.security.web.session.SessionManagementFilter@2978de23, org.springframework.security.web.access.ExceptionTranslationFilter@5bf190dd, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@22b3fc11]

AppInitializer.java

public class AppInitializer
        extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SecurityConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

}

SecurityConfig.java

@Configuration
@EnableWebMvcSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        System.out.println("______________");
        auth
                .inMemoryAuthentication()
                .withUser("user").password("password").roles("USER");
    }

}

SecurityWebApplicationInitializer.java

public class SecurityWebApplicationInitializer
        extends AbstractSecurityWebApplicationInitializer {

}

WebConfig.java

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.acme.app")
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**")
                .addResourceLocations("/static/");
    }

    @Bean
    public CookieLocaleResolver getLocaleResolver() {
        CookieLocaleResolver bean = new CookieLocaleResolver();
        bean.setCookieName("clientlanguage");
        bean.setCookieMaxAge(100000);
        return bean;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
        lci.setParamName("lang");
        registry.addInterceptor(lci);
    }

    @Bean
    public TilesConfigurer getTilesConfigurer() {
        CustomTilesInitializer ti = new CustomTilesInitializer();
        TilesConfigurer res = new TilesConfigurer();
        res.setCompleteAutoload(true);
        res.setDefinitions("/WEB-INF/**/tiles.xml");
        return res;
    }

    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        registry.tiles();
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("home");
        registry.addRedirectViewController("/home", "/");
        registry.addViewController("/login").setViewName("login");
        registry.addViewController("/aboutme").setViewName("aboutme");
    }

}

更新

正如@lkrnac用他的答案指出的那样，在WebConfig @ComponentScan注解过程中配置两次被加载。我已经知道spring将足够聪明以至于不加载它先前加载的配置。我可以将类定位在config名称空间之外，尽管这似乎很麻烦。相反，我选择提供一个排除过滤器，如下所示：

@ComponentScan(basePackages = "com.acme.app",
               excludeFilters = {
                   @Filter(type = ASSIGNABLE_TYPE,
                           value = {
                               WebConfig.class,
                               SecurityConfig.class
                           })
               })

这样，我仍然可以为我的Web上下文自由创建新的配置类，而不必担心是否包含它们。