JDK1.8 LocalDateTime 时间类与字符互转

public static void main(String[] args) {

        DateTimeFormatter dateTimeFormatter=DateTimeFormatter.ofPattern("yy-MM-dd");
        LocalDate localDateTime=LocalDate.now();
        localDateTime.format(dateTimeFormatter);
        System.out.println(localDateTime);

        String time="2018-05-18 23:24:25";
        DateTimeFormatter dateTimeFormatter2=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");//严格遵守大小写
        LocalDateTime localDate=LocalDateTime.parse(time,dateTimeFormatter2);
        LocalDate localDate1=LocalDate.of(localDate.getYear(),localDate.getMonth(),localDate.getDayOfMonth());
        System.out.println(localDate1);//2018-05-18

}