spring ResourceResolverChain 源码
spring ResourceResolverChain 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/resource/ResourceResolverChain.java
/*
* Copyright 2002-2018 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.servlet.resource;
import java.util.List;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.core.io.Resource;
import org.springframework.lang.Nullable;
/**
* A contract for invoking a chain of {@link ResourceResolver ResourceResolvers} where each resolver
* is given a reference to the chain allowing it to delegate when necessary.
*
* @author Jeremy Grelle
* @author Rossen Stoyanchev
* @author Sam Brannen
* @since 4.1
*/
public interface ResourceResolverChain {
/**
* Resolve the supplied request and request path to a {@link Resource} that
* exists under one of the given resource locations.
* @param request the current request
* @param requestPath the portion of the request path to use
* @param locations the locations to search in when looking up resources
* @return the resolved resource, or {@code null} if unresolved
*/
@Nullable
Resource resolveResource(
@Nullable HttpServletRequest request, String requestPath, List<? extends Resource> locations);
/**
* Resolve the externally facing <em>public</em> URL path for clients to use
* to access the resource that is located at the given <em>internal</em>
* resource path.
* <p>This is useful when rendering URL links to clients.
* @param resourcePath the internal resource path
* @param locations the locations to search in when looking up resources
* @return the resolved public URL path, or {@code null} if unresolved
*/
@Nullable
String resolveUrlPath(String resourcePath, List<? extends Resource> locations);
}
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