A ResourcePatternResolver implementation that is able to resolve a
specified resource location path into one or more matching Resources.
The source path may be a simple path which has a one-to-one mapping to a
target Resource, or alternatively
may contain the special "classpath*:" prefix and/or
internal Ant-style regular expressions (matched using AntPathMatcher).
Both of the latter are effectively wildcards.
No Wildcards:
In the simple case, if the specified location path does not start with the
"classpath*:" prefix, and does not contain a PathMatcher pattern,
this resolver will simply return a single resource via a
getResource() call on the underlying ResourceLoader.
Examples are real URLs such as "file:C:/context.xml", pseudo-URLs
such as "classpath:/context.xml", and simple unprefixed paths
such as "/WEB-INF/context.xml". The latter will resolve in a
fashion specific to the underlying ResourceLoader (e.g.
ServletContextResource for a WebApplicationContext).
Ant-style Patterns:
When the path location contains an Ant-style pattern, e.g.:
/WEB-INF/*-context.xml com/mycompany/**/applicationContext.xml file:C:/some/path/*-context.xml classpath:com/mycompany/**/applicationContext.xmlthe resolver follows a more complex but defined procedure to try to resolve the wildcard. It produces a
Resource for the path up to the last
non-wildcard segment and obtains a URL from it. If this URL is
not a "jar:" URL or container-specific variant (e.g.
"zip:" in WebLogic, "wsjar" in WebSphere", etc.),
then a java.io.File is obtained from it, and used to resolve the
wildcard by walking the filesystem. In the case of a jar URL, the resolver
either gets a java.net.JarURLConnection from it, or manually parses
the jar URL, and then traverses the contents of the jar file, to resolve the
wildcards.
Implications on portability:
If the specified path is already a file URL (either explicitly, or
implicitly because the base ResourceLoader is a filesystem one,
then wildcarding is guaranteed to work in a completely portable fashion.
If the specified path is a classpath location, then the resolver must
obtain the last non-wildcard path segment URL via a
Classloader.getResource() call. Since this is just a
node of the path (not the file at the end) it is actually undefined
(in the ClassLoader Javadocs) exactly what sort of a URL is returned in
this case. In practice, it is usually a java.io.File representing
the directory, where the classpath resource resolves to a filesystem
location, or a jar URL of some sort, where the classpath resource resolves
to a jar location. Still, there is a portability concern on this operation.
If a jar URL is obtained for the last non-wildcard segment, the resolver
must be able to get a java.net.JarURLConnection from it, or
manually parse the jar URL, to be able to walk the contents of the jar,
and resolve the wildcard. This will work in most environments, but will
fail in others, and it is strongly recommended that the wildcard
resolution of resources coming from jars be thoroughly tested in your
specific environment before you rely on it.
classpath*: Prefix:
There is special support for retrieving multiple class path resources with
the same name, via the "classpath*:" prefix. For example,
"classpath*:META-INF/beans.xml" will find all "beans.xml"
files in the class path, be it in "classes" directories or in JAR files.
This is particularly useful for autodetecting config files of the same name
at the same location within each jar file. Internally, this happens via a
ClassLoader.getResources() call, and is completely portable.
The "classpath*:" prefix can also be combined with a PathMatcher pattern in
the rest of the location path, for example "classpath*:META-INF/*-beans.xml".
In this case, the resolution strategy is fairly simple: a
ClassLoader.getResources() call is used on the last non-wildcard
path segment to get all the matching resources in the class loader hierarchy,
and then off each resource the same PathMatcher resolution strategy described
above is used for the wildcard subpath.
Other notes:
WARNING: Note that "classpath*:" when combined with
Ant-style patterns will only work reliably with at least one root directory
before the pattern starts, unless the actual target files reside in the file
system. This means that a pattern like "classpath*:*.xml" will
not retrieve files from the root of jar files but rather only from the
root of expanded directories. This originates from a limitation in the JDK's
ClassLoader.getResources() method which only returns file system
locations for a passed-in empty String (indicating potential roots to search).
WARNING: Ant-style patterns with "classpath:" resources are not guaranteed to find matching resources if the root package to search is available in multiple class path locations. This is because a resource such as
com/mycompany/package1/service-context.xml
may be in only one location, but when a path such as
classpath:com/mycompany/**/service-context.xml
is used to try to resolve it, the resolver will work off the (first) URL
returned by getResource("com/mycompany");. If this base package
node exists in multiple classloader locations, the actual end resource may
not be underneath. Therefore, preferably, use "classpath*:" with the same
Ant-style pattern in such a case, which will search all class path
locations that contain the root package.
- Authors:
- Juergen Hoeller
- Colin Sampaleanu
- Marius Bogoevici
- Costin Leau
- See Also:
- java.lang.ClassLoader#getResources(String)
- Since:
- 1.0.2
| Constructor and description |
|---|
PathMatchingResourcePatternResolver
()Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader. |
PathMatchingResourcePatternResolver
(java.lang.ClassLoader classLoader)Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader. |
PathMatchingResourcePatternResolver
(ResourceLoader resourceLoader)Create a new PathMatchingResourcePatternResolver. |
| Type Params | Return Type | Name and description |
|---|---|---|
|
protected Resource |
convertClassLoaderURL(java.net.URL url)Convert the given URL as returned from the ClassLoader into a Resource object. |
|
protected java.lang.String |
determineRootDir(java.lang.String location)Determine the root directory for the given location. |
|
protected java.util.Set<Resource> |
doFindMatchingFileSystemResources(java.io.File rootDir, java.lang.String subPattern)Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher. |
|
protected java.util.Set<Resource> |
doFindPathMatchingFileResources(Resource rootDirResource, java.lang.String subPattern)Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher. |
|
protected java.util.Set<Resource> |
doFindPathMatchingJarResources(Resource rootDirResource, java.lang.String subPattern)Find all resources in jar files that match the given location pattern via the Ant-style PathMatcher. |
|
protected void |
doRetrieveMatchingFiles(java.lang.String fullPattern, java.io.File dir, java.util.Set<java.io.File> result)Recursively retrieve files that match the given pattern, adding them to the given result list. |
|
protected Resource[] |
findAllClassPathResources(java.lang.String location)Find all class location resources with the given location via the ClassLoader. |
|
protected Resource[] |
findPathMatchingResources(java.lang.String locationPattern)Find all resources that match the given location pattern via the Ant-style PathMatcher. |
|
java.lang.ClassLoader |
getClassLoader()Return the ClassLoader that this pattern resolver works with (never null). |
|
protected java.util.jar.JarFile |
getJarFile(java.lang.String jarFileUrl)Resolve the given jar file URL into a JarFile object. |
|
AntPathMatcher |
getPathMatcher()Return the PathMatcher that this resource pattern resolver uses. |
|
Resource |
getResource(java.lang.String location) |
|
ResourceLoader |
getResourceLoader()Return the ResourceLoader that this pattern resolver works with. |
|
Resource[] |
getResources(java.lang.String locationPattern) |
|
protected boolean |
isJarResource(Resource resource)Return whether the given resource handle indicates a jar resource that the doFindPathMatchingJarResources method can handle. |
|
protected Resource |
resolveRootDirResource(Resource original)Resolve the specified resource for path matching. |
|
protected java.util.Set<java.io.File> |
retrieveMatchingFiles(java.io.File rootDir, java.lang.String pattern)Retrieve files that match the given path pattern, checking the given directory and its subdirectories. |
|
void |
setPathMatcher(AntPathMatcher pathMatcher)Set the PathMatcher implementation to use for this resource pattern resolver. |
| Methods inherited from class | Name |
|---|---|
class java.lang.Object |
java.lang.Object#wait(long, int), java.lang.Object#wait(long), java.lang.Object#wait(), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll() |
Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
ClassLoader access will happen via the thread context class loader.
Create a new PathMatchingResourcePatternResolver with a DefaultResourceLoader.
classLoader - the ClassLoader to load classpath resources with,
or null for using the thread context class loader
at the time of actual resource accessCreate a new PathMatchingResourcePatternResolver.
ClassLoader access will happen via the thread context class loader.
resourceLoader - the ResourceLoader to load root directories and
actual resources withConvert the given URL as returned from the ClassLoader into a Resource object.
The default implementation simply creates a UrlResource instance.
url - a URL as returned from the ClassLoaderDetermine the root directory for the given location.
Used for determining the starting point for file matching,
resolving the root directory location to a java.io.File
and passing it into retrieveMatchingFiles, with the
remainder of the location as pattern.
Will return "/WEB-INF/" for the pattern "/WEB-INF/*.xml", for example.
location - the location to checkFind all resources in the file system that match the given location pattern via the Ant-style PathMatcher.
rootDir - the root directory in the file systemsubPattern - the sub pattern to match (below the root directory)Find all resources in the file system that match the given location pattern via the Ant-style PathMatcher.
rootDirResource - the root directory as ResourcesubPattern - the sub pattern to match (below the root directory)Find all resources in jar files that match the given location pattern via the Ant-style PathMatcher.
rootDirResource - the root directory as ResourcesubPattern - the sub pattern to match (below the root directory)Recursively retrieve files that match the given pattern, adding them to the given result list.
fullPattern - the pattern to match against,
with prepended root directory pathdir - the current directoryresult - the Set of matching File instances to add toFind all class location resources with the given location via the ClassLoader.
location - the absolute path within the classpathFind all resources that match the given location pattern via the Ant-style PathMatcher. Supports resources in jar files and zip files and in the file system.
locationPattern - the location pattern to match Return the ClassLoader that this pattern resolver works with
(never null).
Resolve the given jar file URL into a JarFile object.
Return the PathMatcher that this resource pattern resolver uses.
Return the ResourceLoader that this pattern resolver works with.
Return whether the given resource handle indicates a jar resource
that the doFindPathMatchingJarResources method can handle.
The default implementation checks against the URL protocols "jar", "zip" and "wsjar" (the latter are used by BEA WebLogic Server and IBM WebSphere, respectively, but can be treated like jar files).
resource - the resource handle to check
(usually the root directory to start path matching from)Resolve the specified resource for path matching.
The default implementation detects an Equinox OSGi "bundleresource:" / "bundleentry:" URL and resolves it into a standard jar file URL that can be traversed using Spring's standard jar file traversal algorithm.
original - the resource to resolveRetrieve files that match the given path pattern, checking the given directory and its subdirectories.
rootDir - the directory to start frompattern - the pattern to match against,
relative to the root directorySet the PathMatcher implementation to use for this resource pattern resolver. Default is AntPathMatcher.