Java 如何获取当前年份、月份和日期字符串

首先创建一个Calendar类的实例对象，Calendar类属于java.util包： Calendar calendar = Calendar.getInstance(); **获取当前年份、月份和日期** + 获取当前年 int year = calendar.get(Calendar.YEAR); + 获取当前月 int month = calendar.get(Calendar.MONTH) + 1; + 获取当前日 int day = calenedar.get(Calendar.DATE); + 获取当前小时 int hour = calendar.get(Calendar.HOUR_OF_DAY); + 获取当前分钟 int minute = calendar.get(Calendar.MINUTE); + 获取当前秒 int second = calendar.get(Calendar.SECOND); + 获取当前是本周第几天 int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK); + 获取当前是本月第几天 int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH); + 获取当前是本年第几天 int dayOfYear = calendar.get(Calendar.DAY_OF_YEAR); **获取当月的第一天和最后一天** SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); + 获取当月第一天 calendar = Calendar.getInstance(); calendar.add(Calendar.MONTH, 0); calendar.set(Calendar.DAY_OF_MONTH, 1); String firstday = format.format(calendar.getTime()); + 获取当月最后一天 calendar = Calendar.getInstance(); calendar.add(Calendar.MONTH, 1); calendar.set(Calendar.DAY_OF_MONTH, 0); String lastday = format.format(calendar.getTime()); **获取当前日期** SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); Date date = new Date(); String today = format.format(date);