/*
获取系统当前日志 date 转 字符串
%tf 2017-03-28
%tT 14:50:19
%tR 14:50
*/
public static void main(String[] args){
Date date = new Date();
String str = String.format("%tF", date) + " " + String.format("%tT", date);
System.out.println(str);
}
输出格式:2017-03-28 14:50:19