利用Calendar获取Date中的年、月、日、时、分、秒等

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java.util.Date中提供的getYear()、getMonth()、getDay()等建议不适用。

这里我们使用java.util.Calendar来替代完成，并且该类还提供了更多实用的扩展功能。

Java代码

package org.liw.date;

import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;

import com.ibm.icu.text.SimpleDateFormat;

/**
* Calendar、Date、SimpleDateFormat
* @author lee.will
*
*/
public class TestCalendar {

/**
* 日期格式
*/
public static final String DATE_FORMAT = "yyyy.MM.dd HH:mm:ss";

/**
* 测试
* @param args
*/
public static void main(String[] args) {

  //将日期字符串转换为日期
  Date dateTime = null;
  String dateTimeStr = "2011.08.18 14:20:35";
  SimpleDateFormat simpleDateFormat = new SimpleDateFormat(DATE_FORMAT);
  try {
   dateTime = simpleDateFormat.parse(dateTimeStr);
  } catch (ParseException e) {
   System.err.println("日期字符串转换到日期出错.");
   System.exit(1);
  }

  //日期转换为日历并获取参数
  Calendar calendar = Calendar.getInstance();
  calendar.setTime(dateTime);
  int year = calendar.get(Calendar.YEAR);
  int month = calendar.get(Calendar.MONTH);
  int day = calendar.get(Calendar.DAY_OF_MONTH);
  int hour = calendar.get(Calendar.HOUR_OF_DAY);//Calendar.HOUR为12小时制
  int minute = calendar.get(Calendar.MINUTE);
  int second = calendar.get(Calendar.SECOND);
  int weekDay = calendar.get(Calendar.DAY_OF_WEEK);
  String weekDayStr = turnWeekDaytoUpperCase(weekDay);

  //组织数据打印输出
  StringBuffer info = new StringBuffer();
  info.append(year).append("年").append(month).append("月").append(day).append("日")
  .append("\t")
  .append(hour).append(":").append(minute).append(":").append(second)
  .append("\t")
  .append("星期").append(weekDayStr);
  System.out.println(info);
}

/**
* 转换日期小写为大写
* @param weekDay
* @return
*/
private static String turnWeekDaytoUpperCase(int weekDay) {
  String weekDayStr = null;
  switch (weekDay) {
  case 1:
   weekDayStr = "一";
   break;
  case 2:
   weekDayStr = "二";
   break;
  case 3:
   weekDayStr = "三";
   break;
  case 4:
   weekDayStr = "四";
   break;
  case 5:
   weekDayStr = "五";
   break;
  case 6:
   weekDayStr = "六";
   break;
  default:
   weekDayStr = "日";
   break;
  }
  return weekDayStr;
}
}