Spring源码——Resource

Resource

定义

资源文件来自于classPath或者本地文件。

/** * Interface for a resource descriptor that abstracts from the actual * type of underlying resource, such as a file or class path resource. * * <p>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. *

基本方法

基本方法的单元测试以及输出 /** * org.springframework.core.io.Resource test * Created by jinglongjun on 2017/3/30. */public class TestResource { @Test public void testResource() throws IOException { Resource resource = new ClassPathResource("spring.xml"); System.out.println(resource.exists()); System.out.println(resource.getDescription()); System.out.println(resource.getURL().getPath()); }} 输出结果： trueclass path resource [spring.xml]/Users/jinglongjun/programe/workspace/spring/target/test-classes/spring.xml

Resouce继承关系

ClassPathResource

通过给定的ClassLoader或者ClassPath来加载资源。 /** * Create a new {@code ClassPathResource} for {@code ClassLoader} usage. * A leading slash will be removed, as the ClassLoader resource access * methods will not accept it. * @param path the absolute path within the classpath * @param classLoader the class loader to load the resource with, * or {@code null} for the thread context class loader * @see ClassLoader#getResourceAsStream(String) */ public ClassPathResource(String path, ClassLoader classLoader) { Assert.notNull(path, "Path must not be null"); String pathToUse = StringUtils.cleanPath(path); if (pathToUse.startsWith("/")) { pathToUse = pathToUse.substring(1); } this.path = pathToUse; this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader()); }