spring boot 2.x静态资源会被拦截器拦截的原因分析及解决

package com.itopener.demo.config;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
 
/**
 * @author fuwei.deng
 * @date 2018年4月13日 下午3:32:26
 * @version 1.0.0
 */
public class LoginRequiredInterceptor extends HandlerInterceptorAdapter {
 
	private final Logger logger = LoggerFactory.getLogger(LoginRequiredInterceptor.class);
 
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		logger.info(request.getRequestURI());
		return super.preHandle(request, response, handler);
	}
 
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		logger.info(request.getRequestURI());
		super.afterCompletion(request, response, handler, ex);
	}
}

package com.itopener.demo.config;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
/**
 * @author fuwei.deng
 * @date 2018年4月13日 下午3:32:54
 * @version 1.0.0
 */
@Configuration
public class WebMvcConfiguration extends WebMvcConfigurerAdapter {
 
	private final Logger logger = LoggerFactory.getLogger(WebMvcConfiguration.class);
 
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		logger.info("add interceptors");
		registry.addInterceptor(new LoginRequiredInterceptor());
	}
 
}

/**
 * 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;
}

/**
 * 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() {
    Assert.state(this.applicationContext != null, "No ApplicationContext set");
    Assert.state(this.servletContext != null, "No ServletContext set");
 
    ResourceHandlerRegistry registry = new ResourceHandlerRegistry(this.applicationContext,
				this.servletContext, mvcContentNegotiationManager(), mvcUrlPathHelper());
    addResourceHandlers(registry);
 
    AbstractHandlerMapping handlerMapping = registry.getHandlerMapping();
    if (handlerMapping != null) {
        handlerMapping.setPathMatcher(mvcPathMatcher());
        handlerMapping.setUrlPathHelper(mvcUrlPathHelper());
        // 此处是将所有的HandlerInterceptor都添加了（包含自定义的HandlerInterceptor）
        handlerMapping.setInterceptors(getInterceptors());
        handlerMapping.setCorsConfigurations(getCorsConfigurations());
    }
    else {
        handlerMapping = new EmptyHandlerMapping();
    }
    return handlerMapping;
}
 
/**
 * Provide access to the shared handler interceptors used to configure
 * {@link HandlerMapping} instances with. This method cannot be overridden,
 * use {@link #addInterceptors(InterceptorRegistry)} instead.
 */
protected final Object[] getInterceptors() {
    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();
}

package com.itopener.demo.config;
 
import java.util.Arrays;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
/**
 * @author fuwei.deng
 * @date 2018年4月13日 下午3:32:54
 * @version 1.0.0
 */
@Configuration
public class WebMvcConfiguration implements WebMvcConfigurer {
 
	private final Logger logger = LoggerFactory.getLogger(WebMvcConfiguration.class);
 
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		logger.info("add interceptors");
		registry.addInterceptor(new LoginRequiredInterceptor()).excludePathPatterns(Arrays.asList("/views/**", "/res/**"));
	}
}