ResourceResolver (Spring Framework 5.2.12.RELEASE API)

所有已知实现类:
AbstractResourceResolver, CachingResourceResolver, EncodedResourceResolver, GzipResourceResolver, PathResourceResolver, VersionResourceResolver, WebJarsResourceResolver
```
public interface ResourceResolver
```
A strategy for resolving a request to a server-side resource.
Provides mechanisms for resolving an incoming request to an actual Resource and for obtaining the public URL path that clients should use when requesting the resource.
从以下版本开始:
4.1
作者:
Jeremy Grelle, Rossen Stoyanchev, Sam Brannen
另请参阅:
ResourceResolverChain

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`Resource`	`resolveResource(HttpServletRequest request, String requestPath, List<? extends Resource> locations, ResourceResolverChain chain)`	Resolve the supplied request and request path to a `Resource` that exists under one of the given resource locations.
`String`	`resolveUrlPath(String resourcePath, List<? extends Resource> locations, ResourceResolverChain chain)`	Resolve the externally facing public URL path for clients to use to access the resource that is located at the given internal resource path.

- 方法详细资料
  - resolveResource
```
@Nullable
Resource resolveResource(@Nullable
                         HttpServletRequest request,
                         String requestPath,
                         List<? extends Resource> locations,
                         ResourceResolverChain chain)
```
    Resolve the supplied request and request path to a Resource that exists under one of the given resource locations.
    参数:
    request - the current request (may not be present in some calls)
    requestPath - the portion of the request path to use
    locations - the locations to search in when looking up resources
    chain - the chain of remaining resolvers to delegate to
    返回:
    the resolved resource, or null if unresolved
  - resolveUrlPath
```
@Nullable
String resolveUrlPath(String resourcePath,
                      List<? extends Resource> locations,
                      ResourceResolverChain chain)
```
    Resolve the externally facing public URL path for clients to use to access the resource that is located at the given internal resource path.
    This is useful when rendering URL links to clients.
    参数:
    resourcePath - the internal resource path
    locations - the locations to search in when looking up resources
    chain - the chain of resolvers to delegate to
    返回:
    the resolved public URL path, or null if unresolved