[学习交流] java 时间工具类

import org.apache.commons.lang.StringUtils;

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

/**
* 时间工具类
* @author bluefisher
*
*/
public class DateUtils {

/**
   * 日期格式，yyyyMMdd: "yyyy-MM-dd"
   */
public static final String yyyy_MM_ddStr = "yyyy-MM-dd";

/**
   * 日期格式，yyyyMMddhhmmss: "yyyy-MM-dd kk:mm:ss"
   */
public static final String yyyyMMddhhmmssStr = "yyyy-MM-dd HH:mm:ss";

public DateUtils() {

}

/**
   * 时间加减
   */
public static Date getDateAfterOpTime(Date date,int field,int amount) {
      Calendar cal = Calendar.getInstance();
      cal.setTime(date);
      cal.add(field,amount);
      return cal.getTime();
}

public static String dateToStr(Date date,String pattern){
      SimpleDateFormat sdf = new SimpleDateFormat(pattern);
      return sdf.format(date);
}

public static Date strToDate(String dateStr,String pattern){
      SimpleDateFormat sdf = new SimpleDateFormat(pattern);
      try {
         return sdf.parse(dateStr);
      } catch (ParseException e) {
         e.printStackTrace();
      }
      return null;
}

public static String transferLongToDate(Long millSec,String pattern) {
      SimpleDateFormat sdf = new SimpleDateFormat(pattern);
      Date date = new Date(millSec.longValue());
      return sdf.format(date);
}

public static String getWeekDay() {
return null;
}

public static Date getDate(String dateString, String format) {
if (StringUtils.isNotEmpty(dateString)) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
try {
return simpleDateFormat.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
}
return null;
}

public static String getDate(Date date, String format) {
if (null != date) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
return simpleDateFormat.format(date);
}
return null;
}

/**
   * 获取指定时间的年份
   * @param date
   * @return
   */
public static int getYear(Date date){
      SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
      String dateStr = sd.format(date);

      return Integer.parseInt(dateStr.substring(0, 4));

}

/**
   * 获取制定时间的月份
   * @param date
   * @return
   */
public static int getMonth(Date date){
      Calendar calendar = Calendar.getInstance();
      calendar.setTime(date);
      return calendar.get(Calendar.MONTH) + 1;

}

/**
   * 获取制定时间的日
   * @param date
   * @return
   */
public static int getDay(Date date){
      Calendar calendar = Calendar.getInstance();
      calendar.setTime(date);
      return calendar.get(Calendar.DAY_OF_MONTH);
}

public static String getWeek(Date date){
      String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
      Calendar calendar = Calendar.getInstance();
      calendar.setTime(date);
      int w = calendar.get(Calendar.DAY_OF_WEEK) - 1;
      if (w < 0)
         w = 0;
      return weekDays[w];
}

//2015年7月5日星期三
public static String getStrDateAndWeed(Date date){
      String str = getYear(date) + "年" + getMonth(date) + "月" + getDay(date) + "日" + " " + getWeek(date);
      return str;
}

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[学习交流] java 时间工具类

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