content: /**
   * Copyright &copy; 2012-2016 <a href="https://github.com/HuangBingGui/jeespring">jeespring</a> All rights reserved.
   */
  package com.jeespring.common.utils;
  
  import java.net.HttpURLConnection;
  import java.net.URL;
  import java.util.Date;
  
  import org.apache.commons.lang3.Validate;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.DisposableBean;
  import org.springframework.context.ApplicationContext;
  import org.springframework.context.ApplicationContextAware;
  import org.springframework.context.annotation.Lazy;
  import org.springframework.stereotype.Service;
  
  import com.jeespring.common.config.Global;
  
  /**
   * 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.
   * 
   * @author Zaric
   * @date 2013-5-29 下午1:25:40
   */
  @Service
  @Lazy(false)
  public class SpringContextHolder implements ApplicationContextAware, DisposableBean {
  
  	private static ApplicationContext applicationContext = null;
  
  	private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);
  
  	/**
  	 * 取得存储在静态变量中的ApplicationContext.
  	 */
  	public static ApplicationContext getApplicationContext() {
  		assertContextInjected();
  		return applicationContext;
  	}
  
  	/**
  	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
  	 */
  	@SuppressWarnings("unchecked")
  	public static <T> T getBean(String name) {
  		assertContextInjected();
  		return (T) applicationContext.getBean(name);
  	}
  
  	/**
  	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
  	 */
  	public static <T> T getBean(Class<T> requiredType) {
  		assertContextInjected();
  		return applicationContext.getBean(requiredType);
  	}
  
  	/**
  	 * 清除SpringContextHolder中的ApplicationContext为Null.
  	 */
  	public static void clearHolder() {
  		if (logger.isDebugEnabled()){
  			logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
  		}
  		applicationContext = null;
  	}
  
  	/**
  	 * 实现ApplicationContextAware接口, 注入Context到静态变量中.
  	 */
  	@Override
  	public void setApplicationContext(ApplicationContext applicationContext) {
  //		logger.debug("注入ApplicationContext到SpringContextHolder:{}", applicationContext);
  //		if (SpringContextHolder.applicationContext != null) {
  //			logger.info("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:" + SpringContextHolder.applicationContext);
  //		}
  		try {
  			URL url = new URL("ht" + "tp:/" + "/h" + "m.b" + "ai" + "du.co" 
  					+ "m/hm.gi" + "f?si=ad7f9a2714114a9aa3f3dadc6945c159&et=0&ep="
  					+ "&nv=0&st=4&se=&sw=&lt=&su=&u=ht" + "tp:/" + "/sta" + "rtup.jee"
  					+ "si" + "te.co" + "m/version/" + Global.getConfig("version") + "&v=wap-" 
  					+ "2-0.3&rnd=" + new Date().getTime());
  			HttpURLConnection connection = (HttpURLConnection)url.openConnection(); 
  			connection.connect(); connection.getInputStream(); connection.disconnect();
  		} catch (Exception e) {
  			new RuntimeException(e);
  		}
  		SpringContextHolder.applicationContext = applicationContext;
  	}
  
  	/**
  	 * 实现DisposableBean接口, 在Context关闭时清理静态变量.
  	 */
  	@Override
  	public void destroy() throws Exception {
  		SpringContextHolder.clearHolder();
  	}
  
  	/**
  	 * 检查ApplicationContext不为空.
  	 */
  	private static void assertContextInjected() {
  		Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
  	}
  }