package com.qgz.common.util;
import org.springframework.context.ApplicationContext;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.context.support.WebApplicationContextUtils;import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;/**
  * Spring 工具类
  *
  * @author gaojun.zhou
  * @date 2016年8月23日
  */
 public class SpringUtil implements ServletContextListener {
     
     private static WebApplicationContext springContext;    public void contextInitialized(ServletContextEvent event) {
         springContext = WebApplicationContextUtils.getWebApplicationContext(event.getServletContext());
     }    public void contextDestroyed(ServletContextEvent event) {
         
     }    /**
      * Gets application context.
      *
      * @return the application context
      */
     public static ApplicationContext getApplicationContext() {
         return springContext;
     }    /**
      * Instantiates a new Spring util.
      */
     public SpringUtil() {
     }     /**
      * Get bean t.
      *
      * @param <T>          the type parameter
      * @param requiredType the required type
      * @return the t
      */
     public static <T> T getBean(Class<T> requiredType){
         
         if(springContext == null){
             
             throw new RuntimeException("springContext is null.");
         }
         return springContext.getBean(requiredType);
     }
     
 }