使用SpringMVC或者SSH過程中，有時可能會遇到這麼一個問題。就是在一個普通的JAVA類（不是controller也不是action類）中無法注入在spring配置檔案中配置的bean。比如你在一個普通java類想呼叫某個在spring中配置的service，你會發現不管你用@Resource還是@Autowired註解都無法注入，物件始終是null。那是因為一般普通的Java類沒有被spring代理，自然無法通過spring注入相關的物件。難道這樣就不能呼叫了嗎？這裡提供下面一個類來解決這個問題：

SpringContextUtil

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;

/**
 * 這個類是為了解決在普通類呼叫service的問題
 * 
 * @ClassName SpringContextUtil
 * @Description
 * @author kokjuis 
 
[email protected]
 * @date 2016-6-12
 * @content
 *      
 */
public class SpringContextUtil implements ApplicationContextAware {
	private static ApplicationContext applicationContext; // Spring應用上下文

	// 下面的這個方法上加了@Override註解，原因是繼承ApplicationContextAware介面是必須實現的方法
	@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);
	}
}
 

然後在spring配置檔案中配置一下這個類：

<?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工具類 -->
	<bean id="SpringContextUtil" class="com.im.utils.SpringContextUtil"
		scope="singleton"></bean>


</beans>
 

/**
     * 獲取spring託管的redis連線池
     */
    private JedisPool jedisPool = (JedisPool) SpringContextUtil.getBean("jedisPool");