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SpringBeanUtil: Spring で SingletonS2Container.getComponent() 相当を実現
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/* | |
* Copyright 2014 Jun Futagawa | |
* | |
* 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 jp.integ.spring.util; | |
import javax.servlet.http.HttpServletRequest; | |
import org.springframework.context.ApplicationContext; | |
import org.springframework.web.context.request.RequestContextHolder; | |
import org.springframework.web.context.request.ServletRequestAttributes; | |
import org.springframework.web.servlet.DispatcherServlet; | |
/** | |
* Spring が管理している Bean のインスタンスを取得するユーティリティクラスです。 | |
* Bean 定義を XML ファイルではなく、Spring Boot などのアノテーション使用時にも動作します。 | |
* HttpServletRequest に依存しているため、Web Application 以外での使用は考慮していません。 | |
* | |
* @author Jun Futagawa | |
*/ | |
public class SpringBeanUtil { | |
/** {@link ApplicationContext} です。 */ | |
private ApplicationContext applicationContext; | |
/** 唯一のインスタンスです。 */ | |
private static SpringBeanUtil instance; | |
/** | |
* インスタンスを作成します。 | |
*/ | |
public SpringBeanUtil() { | |
setupApplicationContext(); | |
} | |
/** | |
* {@link ApplicationContext} をセットアップします。 | |
*/ | |
protected void setupApplicationContext() { | |
HttpServletRequest request = getRequest(); | |
if (request == null) { | |
throw new UnsupportedOperationException(); | |
} | |
applicationContext = | |
(ApplicationContext)request.getAttribute(DispatcherServlet.WEB_APPLICATION_CONTEXT_ATTRIBUTE); | |
} | |
/** | |
* 唯一のインスタンスを返します。 | |
* | |
* @return {@link SpringBeanUtil} | |
*/ | |
public static synchronized SpringBeanUtil getInstance() { | |
if (instance == null) { | |
instance = new SpringBeanUtil(); | |
} | |
return instance; | |
} | |
/** | |
* {@link ApplicationContext} を返します。 | |
* | |
* @return {@link ApplicationContext} | |
*/ | |
public ApplicationContext getApplicationContext() { | |
return applicationContext; | |
} | |
/** | |
* 指定したクラスの Spring が管理しているインスタンスを返します。 | |
* | |
* @param clazz | |
* クラス | |
* @return Spring が管理しているインスタンス | |
*/ | |
public static <T> T getBean(Class<T> clazz) { | |
return getInstance().applicationContext.getBean(clazz); | |
} | |
/** | |
* Spring が管理している {@link HttpServletRequest} を返します。 | |
* | |
* @return {@link HttpServletRequest} | |
*/ | |
protected static HttpServletRequest getRequest() { | |
ServletRequestAttributes servletRequestAttributes = | |
(ServletRequestAttributes)RequestContextHolder.getRequestAttributes(); | |
HttpServletRequest request = null; | |
if (servletRequestAttributes != null) { | |
request = servletRequestAttributes.getRequest(); | |
} | |
return request; | |
} | |
} |
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