Spring 配置资源Resource

Java中，不同来源的资源抽象成URL，通过注册不同的handler（URLStreamHandler）来处理不同来源的资源的读取逻辑。一般handler的类型使用不同的前缀（协议，protocal）来识别，如：“file：”、“http：“、”jar：”等。对于Spring，URL没有定义相应的，如“classpath：“的handler，定义也相对麻烦，Spring对配置文件的读取做了相应的封装，通过Resource接口来抽象底层资源。如下：/**
* Interface for a resource descriptor that abstracts from the actual
* type of underlying resource, such as a file or class path resource.
*
* An InputStream can be opened for every resource if it exists in
* physical form, but a URL or File handle can just be returned for
* certain resources. The actual behavior is implementation-specific.
*
* @author Juergen Hoeller
* @since 28.12.2003
* @see #getInputStream（）
* @see #getURL（）
* @see #getURI（）
* @see #getFile（）
* @see WritableResource
* @see ContextResource
* @see FileSystemResource
* @see ClassPathResource
* @see UrlResource
* @see ByteArrayResource
* @see InputStreamResource
* @see PathResource
*/
public interface Resource extends InputStreamSource { /**
* Return whether this resource actually exists in physical form.
* This method performs a definitive existence check, whereas the
* existence of a {@code Resource} handle only guarantees a
* valid descriptor handle.
*/
boolean exists（）; /**
* Return whether the contents of this resource can be read,
* e.g. via {@link #getInputStream（）} or {@link #getFile（）}.
* Will be {@code true} for typical resource descriptors;
* note that actual content reading may still fail when attempted.
* However, a value of {@code false} is a definitive indication
* that the resource content cannot be read.
* @see #getInputStream（）
*/
boolean isReadable（）; /**
* Return whether this resource represents a handle with an open
* stream. If true, the InputStream cannot be read multiple times,
* and must be read and closed to avoid resource leaks.
* Will be {@code false} for typical resource descriptors.
*/
boolean isOpen（）; /**
* Return a URL handle for this resource.
* @throws IOException if the resource cannot be resolved as URL,
* i.e. if the resource is not available as descriptor
*/
URL getURL（） throws IOException; /**
* Return a URI handle for this resource.
* @throws IOException if the resource cannot be resolved as URI,
* i.e. if the resource is not available as descriptor
*/
URI getURI（） throws IOException; /**
* Return a File handle for this resource.
* @throws IOException if the resource cannot be resolved as absolute
* file path, i.e. if the resource is not available in a file system
*/
File getFile（） throws IOException; /**
* Determine the content length for this resource.
* @throws IOException if the resource cannot be resolved
* （in the file system or as some other known physical resource type）
*/
long contentLength（） throws IOException; /**
* Determine the last-modified timestamp for this resource.
* @throws IOException if the resource cannot be resolved
* （in the file system or as some other known physical resource type）
*/
long lastModified（） throws IOException; /**
* Create a resource relative to this resource.
* @param relativePath the relative path （relative to this resource）
* @return the resource handle for the relative resource
* @throws IOException if the relative resource cannot be determined
*/
Resource createRelative（String relativePath） throws IOException; /**
* Determine a filename for this resource, i.e. typically the last
* part of the path: for example, "myfile.txt".
* Returns {@code null} if this type of resource does not
* have a filename.
*/
String getFilename（）; /**
* Return a description for this resource,
* to be used for error output when working with the resource.
* Implementations are also encouraged to return this value
* from their {@code toString} method.
* @see Object#toString（）
*/
String getDescription（）;}对于不同来源的资源文件都有相应的Resource实现，文件（FileSystemResource）、Classpath资源（ClassPathResource）、URL资源（UrlResource）、InputStream资源（InputStreamResource）、Byte数组资源（ByteArrayResource）等。Spring中如何配置Hibernate事务 http://www.linuxidc.com/Linux/2013-12/93681.htmStruts2整合Spring方法及原理 http://www.linuxidc.com/Linux/2013-12/93692.htm基于 Spring 设计并实现 RESTful Web Services http://www.linuxidc.com/Linux/2013-10/91974.htmSpring-3.2.4 + Quartz-2.2.0集成实例 http://www.linuxidc.com/Linux/2013-10/91524.htm使用 Spring 进行单元测试 http://www.linuxidc.com/Linux/2013-09/89913.htm运用Spring注解实现Netty服务器端UDP应用程序 http://www.linuxidc.com/Linux/2013-09/89780.htmSpring 3.x 企业应用开发实战 PDF完整高清扫描版+源代码 http://www.linuxidc.com/Linux/2013-10/91357.htmSpring 的详细介绍：请点这里
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