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Java Model
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package com.litongjava.model.date;

import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;

/**
 * 弄个全局的日期格式化类，这里的对象是线程安全的
 * @author tanyaowu
 */
public class DateFmt {
  public static final DateTimeFormatter yyyyMMddHHmmssSSS = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS");
  public static final DateTimeFormatter yyyyMMddHHmmss = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
  public static final DateTimeFormatter yyyyMMddHHmm = DateTimeFormatter.ofPattern("yyyyMMddHHmm");
  public static final DateTimeFormatter yyyyMMddHH = DateTimeFormatter.ofPattern("yyyyMMddHH");
  public static final DateTimeFormatter yyyyMMdd = DateTimeFormatter.ofPattern("yyyyMMdd");
  public static final DateTimeFormatter yyyyMM = DateTimeFormatter.ofPattern("yyyyMM");
  public static final DateTimeFormatter yyyy = DateTimeFormatter.ofPattern("yyyy");
  public static final DateTimeFormatter HHmmss = DateTimeFormatter.ofPattern("HHmmss");
  public static final DateTimeFormatter HHmm = DateTimeFormatter.ofPattern("HHmm");
  public static final DateTimeFormatter HH = DateTimeFormatter.ofPattern("HH");
  public static final DateTimeFormatter yyyy_MM_dd_HHmmssSSS = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
  public static final DateTimeFormatter yyyy_MM_dd_HHmmss = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

  private static final Map map = new HashMap<>();
  static {
    map.put("yyyyMMddHHmmssSSS", yyyyMMddHHmmssSSS);
    map.put("yyyyMMddHHmmss", yyyyMMddHHmmss);
    map.put("yyyyMMddHHmm", yyyyMMddHHmm);
    map.put("yyyyMMddHH", yyyyMMddHH);
    map.put("yyyyMMdd", yyyyMMdd);
    map.put("yyyyMM", yyyyMM);
    map.put("yyyy", yyyy);
    map.put("HHmmss", HHmmss);
    map.put("HHmm", HHmm);
    map.put("HH", HH);

    map.put("yyyy_MM_dd_HHmmssSSS", yyyy_MM_dd_HHmmssSSS);
    map.put("yyyy_MM_dd_HHmmss", yyyy_MM_dd_HHmmss);
  }

  /**
   * 
   * @param pattern
   * @return
   */
  public static final DateTimeFormatter of(String pattern) {
    DateTimeFormatter ret = map.get(pattern);
    if (ret != null) {
      return ret;
    }
    ret = DateTimeFormatter.ofPattern(pattern);
    map.put(pattern, ret);
    return ret;
  }
}