一个线程安全的单例模式示例

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package com.tecsun.das.collect.modules.util.config;

import com.alibaba.fastjson.JSON;
import net.sf.json.JSONObject;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* Created by Zetting on 2016/9/22.
* Description:读取元配置信息
*/
public class MetaConfg {

private volatile static MetaConfg instance;private volatile static Map<String,MetadataBean> configs =new HashMap<String, MetadataBean>();private static Logger logger = LoggerFactory.getLogger(MetaConfg.class);/** * 单例 * @return */private static MetaConfg getInstance(){    if(instance == null){        synchronized (MetaConfg.class){            if(instance == null){                instance = new MetaConfg();            }        }    }    return instance;}private MetaConfg(){}

}

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