时间日期相关工具类-获取星期，月份，时间戳转化等

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package com.onetoo.www.onetoo.utils;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;/*** Created by longShun on 2016/10/16.* 时间日期相关的工具类* java中获取当前时间的时间戳是13位数的；* 注意：如果服务器返回的时间戳是10位数，需要乘以1000再使用*/
public class TimeUtils {public static final SimpleDateFormat DEFAULT_DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public static final SimpleDateFormat DATE_FORMAT_DATE = new SimpleDateFormat("yyyy-MM-dd");private TimeUtils() {throw new AssertionError();}/*** long time to string** @param timeInMillis timeInMillis* @param dateFormat   dateFormat* @return String*/public static String getTime(long timeInMillis, SimpleDateFormat dateFormat) {return dateFormat.format(new Date(timeInMillis));}/*** long time to string, format is {@link #DEFAULT_DATE_FORMAT}** @param timeInMillis timeInMillis* @return String*/public static String getTime(long timeInMillis) {return getTime(timeInMillis, DEFAULT_DATE_FORMAT);}/*** get current time in milliseconds** @return long*/public static long getCurrentTimeInLong() {return System.currentTimeMillis();}/*** get current time in milliseconds, format is {@link #DEFAULT_DATE_FORMAT}** @return String*/public static String getCurrentTimeInString() {return getTime(getCurrentTimeInLong());}/*** get current time in milliseconds** @return String*/public static String getCurrentTimeInString(SimpleDateFormat dateFormat) {return getTime(getCurrentTimeInLong(), dateFormat);}/*** 时间转换为时间戳** @param timeStr 时间 例如: 2016-03-09* @param format  时间对应格式  例如: yyyy-MM-dd*/public static long getTimeStamp(String timeStr, String format) {SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);Date date;try {date = simpleDateFormat.parse(timeStr);return date.getTime();} catch (ParseException e) {e.printStackTrace();}return 0;}/*** 根据时间戳（13位数，10位数需要乘以1000）获取当前月份* @param timeStamp 时间戳* @return month*/public static int getMonth(long timeStamp) {Calendar c = Calendar.getInstance();c.setTimeInMillis(timeStamp);//Time.MONTH及Calendar.MONTH 默认的月份为  0-11return c.get(Calendar.MONTH)+1;}public static String getWeek(long timeStamp) {String week = "周";Calendar calendar = Calendar.getInstance();calendar.setTimeInMillis(timeStamp);int i = calendar.get(Calendar.DAY_OF_WEEK);switch (i) {case 1:week += "日";break;case 2:week += "一";break;case 3:week += "二";break;case 4:week += "三";break;case 5:week += "四";break;case 6:week += "五";break;case 7:week += "六";break;}return week;}/*** 判断当前日期是星期几** @param pTime 设置的需要判断的时间  格式如2012-09-08* @return  星期几*/public static String getWeek(String pTime) {String week = null;try {Date date = DATE_FORMAT_DATE.parse(pTime);long timeStamp = date.getTime();week = getWeek(timeStamp);} catch (ParseException e) {e.printStackTrace();}return week;}
}