97 lines
2.9 KiB
Java
97 lines
2.9 KiB
Java
/**
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* Copyright © 2012-2016 <a href="http://www.zkjkgc.com">zkjkgc</a> All rights reserved.
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*/
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package com.rymcu.vertical.util;
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import org.apache.commons.lang3.Validate;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.DisposableBean;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ApplicationContextAware;
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import org.springframework.context.annotation.Lazy;
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import org.springframework.stereotype.Service;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.Date;
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/**
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* 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext.
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*
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* @author ronger
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*/
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@Service
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@Lazy(false)
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public class SpringContextHolder implements ApplicationContextAware, DisposableBean {
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@Value("${version}")
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private String version;
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private static ApplicationContext applicationContext = null;
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private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);
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/**
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* 取得存储在静态变量中的ApplicationContext.
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*/
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public static ApplicationContext getApplicationContext() {
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assertContextInjected();
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return applicationContext;
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}
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/**
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* 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
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*/
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@SuppressWarnings("unchecked")
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public static <T> T getBean(String name) {
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assertContextInjected();
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return (T) applicationContext.getBean(name);
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}
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/**
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* 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
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*/
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public static <T> T getBean(Class<T> requiredType) {
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assertContextInjected();
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return applicationContext.getBean(requiredType);
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}
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/**
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* 清除SpringContextHolder中的ApplicationContext为Null.
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*/
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public static void clearHolder() {
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if (logger.isDebugEnabled()){
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logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
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}
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applicationContext = null;
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}
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/**
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* 实现ApplicationContextAware接口, 注入Context到静态变量中.
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*/
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@Override
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public void setApplicationContext(ApplicationContext applicationContext) {
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logger.debug("注入ApplicationContext到SpringContextHolder:{}", applicationContext);
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if (SpringContextHolder.applicationContext != null) {
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logger.info("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:" + SpringContextHolder.applicationContext);
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}
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SpringContextHolder.applicationContext = applicationContext;
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}
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/**
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* 实现DisposableBean接口, 在Context关闭时清理静态变量.
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*/
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@Override
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public void destroy() throws Exception {
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SpringContextHolder.clearHolder();
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}
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/**
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* 检查ApplicationContext不为空.
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*/
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private static void assertContextInjected() {
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Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
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}
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} |