JAVA解决在@autowired,@Resource注入为null的情况

package com.im.utils;
 
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
 
/**
 * 这个类是为了解决在普通类调用service的问题
 * 
 * @ClassName SpringContextUtil
 * @Description
 * @author kokjuis 189155278@qq.com
 * @date 2016-6-12
 * @content
 *  
 */
public class SpringContextUtil implements ApplicationContextAware {
	private static ApplicationContext applicationContext; // Spring应用上下文
 
	// 下面的这个方法上加了@Override注解，原因是继承ApplicationContextAware接口是必须实现的方法
	@Override
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
		SpringContextUtil.applicationContext = applicationContext;
	}
 
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}
 
	public static Object getBean(String name) throws BeansException {
		return applicationContext.getBean(name);
	}
 
	public static Object getBean(String name, Class requiredType)
			throws BeansException {
 
		return applicationContext.getBean(name, requiredType);
	}
 
	public static boolean containsBean(String name) {
		return applicationContext.containsBean(name);
	}
 
	public static boolean isSingleton(String name)
			throws NoSuchBeanDefinitionException {
		return applicationContext.isSingleton(name);
	}
 
	public static Class getType(String name)
			throws NoSuchBeanDefinitionException {
		return applicationContext.getType(name);
	}
 
	public static String[] getAliases(String name)
			throws NoSuchBeanDefinitionException {
		return applicationContext.getAliases(name);
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
 xmlns:aop="http://www.springframework.org/schema/aop" xmlns:task="http://www.springframework.org/schema/task"
 xmlns:cache="http://www.springframework.org/schema/cache"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd 
  http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd 
  http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd 
  http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
 
 <!--配置spring工具类 -->
 <bean id="SpringContextUtil" class="com.im.utils.SpringContextUtil"
 scope="singleton"></bean>
 
</beans>

/**
  * 获取spring托管的redis连接池
  */
private JedisPool jedisPool = (JedisPool) SpringContextUtil.getBean("jedisPool");