Java 时间转换的实例代码

java 时间转换的实例代码

import java.text.parseexception;
import java.text.simpledateformat;
import java.util.calendar;
import java.util.date;

/**
 * created by edward on 2016/6/30.
 */
public class timeutil {


  /**
   * 将 1467341232351 转换为 指定格式 "yyyy-mm-dd hh:mm:ss.sss"
   * @param time    "1467342217645"
   * @param pattern   "yyyy-mm-dd hh:mm:ss.sss"
   * @return      2016-07-01 11:03:37.645
   */

  public static string parselongtime2string(string time, string pattern){
    calendar calendar = calendar.getinstance();
    calendar.settimeinmillis(long.valueof(time));
    return new simpledateformat(pattern).format(calendar.gettime());
  }


  /**
   * 将指定格式的字符串转化为long
   * @param time  "2016-07-01 10:52:41.792"
   * @param pattern "yyyy-mm-dd hh:mm:ss.sss"
   * @return     1467341561792
   */
  public static long parsestring2longtime(string time, string pattern)
  {
    date date = null;
    try {
      date = new simpledateformat(pattern).parse(time);
    } catch (parseexception e) {
      e.printstacktrace();
    }
    return date.gettime();
  }

  public static void main(string[] args)
  {
    calendar calendar = calendar.getinstance();

    system.out.println(calendar.gettimeinmillis());

    system.out.println(timeutil.parselongtime2string(string.valueof(calendar.gettimeinmillis()),"yyyy-mm-dd hh:mm:ss.sss"));

    system.out.println(timeutil.parsestring2longtime("2016-07-01 10:52:41.792","yyyy-mm-dd hh:mm:ss.sss"));

  }

}

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