线程安全的日期格式化解析工具

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * 线程安全的日期格式化解析工具
 */
public class ThreadLocalDateUtil {
    private static ThreadLocal<Map<String, SimpleDateFormat>> threadLocal = new ThreadLocal<Map<String, SimpleDateFormat>>() {
        @Override
        protected Map<String, SimpleDateFormat> initialValue() {
            Map<String, SimpleDateFormat> map = new HashMap<>();
            map.put("date", new SimpleDateFormat("yyyy-MM-dd"));
            map.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
            return map;
        }
    };

    public static Date parse(String pattern, String dateStr) throws ParseException {
        return threadLocal.get().get(pattern).parse(dateStr);
    }

    public static String format(String pattern, Date date) {
        return threadLocal.get().get(pattern).format(date);
    }
}