Spring---resource access tool class

The class of access resources provided by the JDK does not satisfy the access requirements of various underlying resources, so spring designs a resource interface that provides the application with more powerful access to the underlying resources.

Main methods:

Boolean exists () to determine if a resource exists

Boolean IsOpen () to determine if the resource is already open

URL GetURL () if the underlying resource can be represented as a URL, the method returns the URL object

File GetFile () if the underlying resource corresponds to a file, the method returns the corresponding Files object

InputStream getInputStream () returns the input stream corresponding to the resource

Specific implementation classes:

Bytearrayresource

Classpathresource

Filesystemresource

Inputstreamresource

Servletcontextresource

Urlresource

To access different types of resources, you must use the corresponding resource implementation class, which is cumbersome, and spring provides a powerful mechanism to load resources that automatically identify different resource types

Resource type address prefix:

Classpath loading resources from the Classpath classpath:com/jike/bean.xml

File File:/com/jike/bean.xml

HTTP/http://www.jike.com/bean.xml

FTP Ftp://www.jike.com/bean.xml

No prefix com/jike/bean.xml

Ant-Style matching characters:

？ : Match one of the characters in the file name

*: matches any character in the file name

* *: Matching multi-layer paths

Examples of ant-style resource paths:

Classpath:com/t*st.xml

File:d:/conf/*.xml

Classpath:com/**/test.xml

Classpath:org/springframework/**/*.xml

Spring defines a set of interfaces for resource loading and provides an implementation class, as follows

Spring---resource access tool class