式_格_期_日

//日期类型转String
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd hh:MM:ss E");
String a = sdf.format(date);

//String转日期类型
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date parse = sdf.parse("2011-01-02");

//获取当期日期
    public static void showDate()
    {
        /* %tF:  2001-01-01
         * %tD:  2001/01/01
         * %tr:  03:01:01 下午
         * %tT:  15:01:01
         */
        Date date = new Date();
        String year = String.format("%tY", date);//年份 
        String moth = String.format("%tB", date);//月份
        String day = String.format("%td", date);//日期
        String hour = String.format("%tH", date);//小时
        String minute = String.format("%tM", date);//分
        String second = String.format("%tS", date);//秒
        //%tc:包含所有日期信息
        System.out.println("现在是:" + year + "年-" + moth + "-" + day + "日" + " "
                + hour + "点" + minute + "分" + second + "秒");
    }

    //获取日期  -- 结果：2011-03-23 17:12:18 星期三
    public static void operationFile()
    {
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss E");
        System.out.println(sdf.format(date));
    }