import org.apache.commons.collections.MapUtils;

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import java.util.Random;

/**

* 获取后缀名工具类

* create by mulin on 2019.09.02

*/

public class SuffixNameUtil {

private static final Logger logger = LogManager.getLogger(DocAndDirManagerImpl.class);

private static final String DATE_FORMAT = "_yyyyMMdd_HHmmss";

private static ThreadLocal<Map<String, SimpleDateFormat>> threadLocal = new ThreadLocal<Map<String, SimpleDateFormat>>(){

protected synchronized HashMap<String, SimpleDateFormat> initialValue() {

logger.info("SimpleDateFormatThreadLocal initialValue -- ");

return new HashMap<>();

}

};

/**

* 获取后缀名

* @return _年月日_时分秒_一位随机数

*/

public static String getSuffixName() {

Map<String, SimpleDateFormat> dateMap = threadLocal.get();

SimpleDateFormat sdf = dateMap.get(DATE_FORMAT);

if (MapUtils.isEmpty(dateMap)) {

logger.info("getSuffixName SimpleDateFormatThreadLocal initialValue -- ");

sdf = new SimpleDateFormat(DATE_FORMAT);

dateMap.put(DATE_FORMAT, sdf);

threadLocal.set(dateMap);

}

Random random = new Random();

int ends = random.nextInt(10);

return sdf.format(new Date()) + "_" + ends;

}

}