Java 常用类库 之 Calandar 日期处理类

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/** 知识点：Calandar 日期处理类 */ import java.util.Calendar; import java.util.GregorianCalendar; public class TestCalendar { public static void main(String[] args) { //实例化 Calandar 对象 Calendar c = new GregorianCalendar(); //输出年，月，日，时，分，秒 System.out.println(c.get(Calendar.YEAR)); //注意：Gregorian日历1月从 0 开始所以要加1 System.out.println(c.get(Calendar.MONTH) + 1); System.out.println(c.get(Calendar.DATE)); System.out.println(c.get(Calendar.HOUR)); System.out.println(c.get(Calendar.MINUTE)); System.out.println(c.get(Calendar.SECOND)); System.out.println(c.get(Calendar.MILLISECOND)); //获得当前日期 System.out.println(DateTime.getDate()); //获得当前日期时间 System.out.println(DateTime.getDateTime()); //获得当前日期时间戳 System.out.println(DateTime.getTimeStamp()); } } /** 日期类的封装 1. 取得当前日期 2. 取得当前日期时间 3. 取得当前时间戳 */ class DateTime { //取得当前日期 public static String getDate() { Calendar c = new GregorianCalendar(); StringBuffer buffer = new StringBuffer(); buffer.append(c.get(Calendar.YEAR)).append("-"); buffer.append(addZero(c.get(Calendar.MONTH) + 1)).append("-"); buffer.append(addZero(c.get(Calendar.DATE))); return buffer.toString(); } //取得当前日期时间 public static String getDateTime() { Calendar c = new GregorianCalendar(); StringBuffer buffer = new StringBuffer(); buffer.append(c.get(Calendar.YEAR)).append("-"); buffer.append(addZero(c.get(Calendar.MONTH) + 1)).append("-"); buffer.append(addZero(c.get(Calendar.DATE))).append(" "); buffer.append(addZero(c.get(Calendar.HOUR))).append(":"); buffer.append(addZero(c.get(Calendar.MINUTE))).append(":"); buffer.append(addZero(c.get(Calendar.SECOND))); return buffer.toString(); } //获取当前时间戳 public static long getTimeStamp() { Calendar c = new GregorianCalendar(); return c.getTime().getTime(); } //如果月，日，时，分，秒小于 10 在前面添加0 public static String addZero(int value) { String str = Integer.toString(value); if (str.length() < 2) return 0 + str; return str; } }

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