springboot2.0以上，静态资源无法访问，及设置拦截器后，login登录页面设置不拦截，还是被拦截到的问题_在拦截器注册类配置了不拦截还是被拦截了

在springboot 2.0以上，在配置文件application.yml中设置静态资源，依然无法访问，如下图在这里插入图片描述

先讲解决方法：

新建一个WebMvcConfig.java文件，继承WebMvcConfigurationSupport来设置静态资源路径

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        super.addResourceHandlers(registry);
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }
}
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这样就可以访问静态资源文件了，至于application.yml已经不需要写了，原因可能是@Ordered加载顺序的问题，这个希望有大佬指教一下

那问题就来了，这样子是可以访问静态资源文件的，但是如果在WebMvcConfig加一个拦截器，如下：

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Autowired
    private UserInterceptor userInterceptor;

    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(userInterceptor).addPathPatterns("/**");
    }

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        super.addResourceHandlers(registry);
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }

}
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就又无法访问了,原因是springboot 2.0继承了spring5，而springboot 1.5x的是继承spring4.3，spring4.3源码如下：

/**
 * Return a handler mapping ordered at Integer.MAX_VALUE-1 with mapped
 * resource handlers. To configure resource handling, override
 * {@link #addResourceHandlers}.
 */
@Bean
public HandlerMapping resourceHandlerMapping() {
    ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext,
				this.servletContext, mvcContentNegotiationManager());
    addResourceHandlers(registry);
 
    AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
    if (handlerMapping != null) {
        handlerMapping.setPathMatcher(mvcPathMatcher());
        handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
        // 此处固定添加了一个Interceptor
        handlerMapping.setInterceptors(new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider()));
        handlerMapping.setCorsConfigurations(getCorsConfigurations());
		}
    else {
        handlerMapping = new EmptyHandlerMapping();
    }
    return handlerMapping;
}
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而spring5.x的源码如下：

	/**
	 * Return a handler mapping ordered at Integer.MAX_VALUE-1 with mapped
	 * resource handlers. To configure resource handling, override
	 * {@link #addResourceHandlers}.
	 */
	@Bean
	@Nullable
	public HandlerMapping resourceHandlerMapping(
			@Qualifier("mvcUrlPathHelper") UrlPathHelper urlPathHelper,
			@Qualifier("mvcPathMatcher") PathMatcher pathMatcher,
			@Qualifier("mvcContentNegotiationManager") ContentNegotiationManager contentNegotiationManager,
			@Qualifier("mvcConversionService") FormattingConversionService conversionService,
			@Qualifier("mvcResourceUrlProvider") ResourceUrlProvider resourceUrlProvider) {

		Assert.state(this.applicationContext != null, "No ApplicationContext set");
		Assert.state(this.servletContext != null, "No ServletContext set");

		ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext,
				this.servletContext, contentNegotiationManager, urlPathHelper);
		addResourceHandlers(registry);

		AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
		if (handlerMapping == null) {
			return null;
		}
		handlerMapping.setPathMatcher(pathMatcher);
		handlerMapping.setUrlPathHelper(urlPathHelper);
		// 此处是将所有的HandlerInterceptor都添加了（包含自定义的HandlerInterceptor）
		handlerMapping.setInterceptors(getInterceptors(conversionService, resourceUrlProvider));
		handlerMapping.setCorsConfigurations(getCorsConfigurations());
		return handlerMapping;
	}
	
	/**
	 * Provide access to the shared handler interceptors used to configure
	 * {@link HandlerMapping} instances with.
	 * <p>This method cannot be overridden; use {@link #addInterceptors} instead.
	 */
	protected final Object[] getInterceptors(
			FormattingConversionService mvcConversionService,
			ResourceUrlProvider mvcResourceUrlProvider) {
		if (this.interceptors == null) {
			InterceptorRegistry registry = new InterceptorRegistry();
			// 此处传入新new的registry对象，在配置类当中设置自定义的HandlerInterceptor后即可获取到
			addInterceptors(registry);
			registry.addInterceptor(new ConversionServiceExposingInterceptor(mvcConversionService));
			registry.addInterceptor(new ResourceUrlProviderExposingInterceptor(mvcResourceUrlProvider));
			this.interceptors = registry.getInterceptors();
		}
		return this.interceptors.toArray();
	}
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从源码当中可以看出，使用spring 5.x时，静态资源也会执行自定义的拦截器，因此在配置拦截器的时候需要指定排除静态资源的访问路径，即配置改为如下即可：

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Autowired
    private UserInterceptor userInterceptor;

    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(userInterceptor).addPathPatterns("/**")
                .excludePathPatterns("/auth/login")
                .excludePathPatterns("/error")
                .excludePathPatterns("/static/**");
    }

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        super.addResourceHandlers(registry);
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }

}
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到这里，如果不添加/error，有时候在进入登录页面的时候，会被拦截器HandlerInterceptor拦截，原因是/error是默认错误跳转页面，也被默认拦截了，如果不exclude，在登陆时候就会被拦截