获取时间字符串

 public static String getDate() {
        Calendar ca = Calendar.getInstance();
        int year = ca.get(Calendar.YEAR);//获取年份
        int month = ca.get(Calendar.MONTH) + 1;//获取月份
        int day = ca.get(Calendar.DATE);//获取日
        int hour = ca.get(Calendar.HOUR_OF_DAY);//小时
        int minute = ca.get(Calendar.MINUTE);//分;
        int second = ca.get(Calendar.SECOND);//秒
        String time;
        if (minute < 10 && second < 10) {
            time = year + "-" + month + "-" + day + " " + hour + ":" + "0" + minute + ":" + "0" + second;
        } else if (minute < 10 && second >= 10) {
            time = year + "-" + month + "-" + day + " " + hour + ":" + "0" + minute + ":" + second;
        } else if (minute >= 10 && second < 10) {
            time = year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + "0" + second;
        } else {
            time = year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second;
        }
        return time;
    }