Java tutorial
/* * Copyright 2002-2018 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 * * https://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.context.support; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.core.io.FileSystemResource; import org.springframework.core.io.Resource; import org.springframework.lang.Nullable; /** * Standalone XML application context, taking the context definition files * from the file system or from URLs, interpreting plain paths as relative * file system locations (e.g. "mydir/myfile.txt"). Useful for test harnesses * as well as for standalone environments. * * <p><b>NOTE:</b> Plain paths will always be interpreted as relative * to the current VM working directory, even if they start with a slash. * (This is consistent with the semantics in a Servlet container.) * <b>Use an explicit "file:" prefix to enforce an absolute file path.</b> * * <p>The config location defaults can be overridden via {@link #getConfigLocations}, * Config locations can either denote concrete files like "/myfiles/context.xml" * or Ant-style patterns like "/myfiles/*-context.xml" (see the * {@link org.springframework.util.AntPathMatcher} javadoc for pattern details). * * <p>Note: In case of multiple config locations, later bean definitions will * override ones defined in earlier loaded files. This can be leveraged to * deliberately override certain bean definitions via an extra XML file. * * <p><b>This is a simple, one-stop shop convenience ApplicationContext. * Consider using the {@link GenericApplicationContext} class in combination * with an {@link org.springframework.beans.factory.xml.XmlBeanDefinitionReader} * for more flexible context setup.</b> * * @author Rod Johnson * @author Juergen Hoeller * @see #getResource * @see #getResourceByPath * @see GenericApplicationContext */ public class FileSystemXmlApplicationContext extends AbstractXmlApplicationContext { /** * Create a new FileSystemXmlApplicationContext for bean-style configuration. * @see #setConfigLocation * @see #setConfigLocations * @see #afterPropertiesSet() */ public FileSystemXmlApplicationContext() { } /** * Create a new FileSystemXmlApplicationContext for bean-style configuration. * @param parent the parent context * @see #setConfigLocation * @see #setConfigLocations * @see #afterPropertiesSet() */ public FileSystemXmlApplicationContext(ApplicationContext parent) { super(parent); } /** * Create a new FileSystemXmlApplicationContext, loading the definitions * from the given XML file and automatically refreshing the context. * @param configLocation file path * @throws BeansException if context creation failed */ public FileSystemXmlApplicationContext(String configLocation) throws BeansException { this(new String[] { configLocation }, true, null); } /** * Create a new FileSystemXmlApplicationContext, loading the definitions * from the given XML files and automatically refreshing the context. * @param configLocations array of file paths * @throws BeansException if context creation failed */ public FileSystemXmlApplicationContext(String... configLocations) throws BeansException { this(configLocations, true, null); } /** * Create a new FileSystemXmlApplicationContext with the given parent, * loading the definitions from the given XML files and automatically * refreshing the context. * @param configLocations array of file paths * @param parent the parent context * @throws BeansException if context creation failed */ public FileSystemXmlApplicationContext(String[] configLocations, ApplicationContext parent) throws BeansException { this(configLocations, true, parent); } /** * Create a new FileSystemXmlApplicationContext, loading the definitions * from the given XML files. * @param configLocations array of file paths * @param refresh whether to automatically refresh the context, * loading all bean definitions and creating all singletons. * Alternatively, call refresh manually after further configuring the context. * @throws BeansException if context creation failed * @see #refresh() */ public FileSystemXmlApplicationContext(String[] configLocations, boolean refresh) throws BeansException { this(configLocations, refresh, null); } /** * Create a new FileSystemXmlApplicationContext with the given parent, * loading the definitions from the given XML files. * @param configLocations array of file paths * @param refresh whether to automatically refresh the context, * loading all bean definitions and creating all singletons. * Alternatively, call refresh manually after further configuring the context. * @param parent the parent context * @throws BeansException if context creation failed * @see #refresh() */ public FileSystemXmlApplicationContext(String[] configLocations, boolean refresh, @Nullable ApplicationContext parent) throws BeansException { super(parent); setConfigLocations(configLocations); if (refresh) { refresh(); } } /** * Resolve resource paths as file system paths. * <p>Note: Even if a given path starts with a slash, it will get * interpreted as relative to the current VM working directory. * This is consistent with the semantics in a Servlet container. * @param path path to the resource * @return the Resource handle * @see org.springframework.web.context.support.XmlWebApplicationContext#getResourceByPath */ @Override protected Resource getResourceByPath(String path) { if (path.startsWith("/")) { path = path.substring(1); } return new FileSystemResource(path); } }