Spring加载applicationContext.xml实现spring容器管理的单例模式

package com.etc.pojo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpUtil {
	static private ApplicationContext ac;
	static {
		ac = new ClassPathXmlApplicationContext("applicationContext.xml");
	}

	private SpUtil() {
	}

	public static ApplicationContext getAc() {
		return ac;
	}
	
}
package com.etc.pojo;

import org.springfra