项目中关于时间的处理方式

来源：互联网发布：数据库模型图多对多编辑：程序博客网时间：2024/04/28 06:02

数据库：timestamp实体：timestampdto:Stringdto用String 是为了方便页面的数据，同时也方便展示数据而页面只提供时间插件让用户选择，不能随便输入还有，在HQL中比较时间大小时可以用...and  unix_timestamp('   timestamp/String    ') < unix_timestamp('   timestamp/String    ')....

    public class CalendarTest {          public static void main(String[] args) {              // 获取当前年份、月份、日期              Calendar cale = null;              cale = Calendar.getInstance();              int year = cale.get(Calendar.YEAR);              int month = cale.get(Calendar.MONTH) + 1;              int day = cale.get(Calendar.DATE);              int hour = cale.get(Calendar.HOUR_OF_DAY);              int minute = cale.get(Calendar.MINUTE);              int second = cale.get(Calendar.SECOND);              int dow = cale.get(Calendar.DAY_OF_WEEK);              int dom = cale.get(Calendar.DAY_OF_MONTH);              int doy = cale.get(Calendar.DAY_OF_YEAR);                    System.out.println("Current Date: " + cale.getTime());              System.out.println("Year: " + year);              System.out.println("Month: " + month);              System.out.println("Day: " + day);              System.out.println("Hour: " + hour);              System.out.println("Minute: " + minute);              System.out.println("Second: " + second);              System.out.println("Day of Week: " + dow);              System.out.println("Day of Month: " + dom);              System.out.println("Day of Year: " + doy);                    // 获取当月第一天和最后一天              SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");              String firstday, lastday;              // 获取前月的第一天              cale = Calendar.getInstance();              cale.add(Calendar.MONTH, 0);              cale.set(Calendar.DAY_OF_MONTH, 1);              firstday = format.format(cale.getTime());              // 获取前月的最后一天              cale = Calendar.getInstance();              cale.add(Calendar.MONTH, 1);              cale.set(Calendar.DAY_OF_MONTH, 0);              lastday = format.format(cale.getTime());              System.out.println("本月第一天和最后一天分别是 ： " + firstday + " and " + lastday);                    // 获取当前日期字符串              Date d = new Date();              System.out.println("当前日期字符串1：" + format.format(d));              System.out.println("当前日期字符串2：" + year + "/" + month + "/" + day + " "                      + hour + ":" + minute + ":" + second);          }            }

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