resourceloader.java

来自「一个关于Spring框架的示例应用程序,简单使用,可以参考.」· Java 代码 · 共 66 行

/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.core.io;

/**
 * Interface to be implemented by objects that can load resources.
 * An ApplicationContext is required to provide this functionality,
 * plus extended ResourcePatternResolver support.
 *
 * <p>DefaultResourceLoader is a standalone implementation that is
 * usable outside an ApplicationContext, also used by ResourceEditor.
 *
 * <p>Bean properties of type Resource and Resource array can be
 * populated from Strings when running in an ApplicationContext,
 * using the particular context's resource loading strategy.
 *
 * @author Juergen Hoeller
 * @since 10.03.2004
 * @see DefaultResourceLoader
 * @see ResourceEditor
 * @see org.springframework.core.io.support.ResourcePatternResolver
 * @see org.springframework.context.ApplicationContext
 * @see org.springframework.context.ResourceLoaderAware
 */
public interface ResourceLoader {

	/** Pseudo URL prefix for loading from the class path: "classpath:" */
	String CLASSPATH_URL_PREFIX = "classpath:";

	/**
	 * Return a Resource handle for the specified resource.
	 * The handle should always be a reusable resource descriptor,
	 * allowing for multiple <code>getInputStream</code> calls.
	 * <p><ul>
	 * <li>Must support fully qualified URLs, e.g. "file:C:/test.dat".
	 * <li>Must support classpath pseudo-URLs, e.g. "classpath:test.dat".
	 * <li>Should support relative file paths, e.g. "WEB-INF/test.dat".
	 * (This will be implementation-specific, typically provided by an
	 * ApplicationContext implementation.)
	 * </ul>
	 * <p>Note that a Resource handle does not imply an existing resource;
	 * you need to invoke Resource's "exists" to check for existence.
	 * @param location the resource location
	 * @return a corresponding Resource handle
	 * @see #CLASSPATH_URL_PREFIX
	 * @see org.springframework.core.io.Resource#exists
	 * @see org.springframework.core.io.Resource#getInputStream
	 */
	Resource getResource(String location);

}