时间相关工具类
public class DateUtil {
private DateUtil(){}
/**
* 枚举日期格式
*/
public enum DatePattern{
/**
* 格式:"yyyy-MM-dd HH:mm:ss"
*/
ALL_TIME{public String getValue(){return "yyyy-MM-dd HH:mm:ss";}},
/**
* 格式:"yyyy-MM"
*/
ONLY_MONTH{public String getValue(){return "yyyy-MM";}},
/**
* 格式:"yyyy-MM-dd"
*/
ONLY_DAY{public String getValue(){return "yyyy-MM-dd";}},
/**
* 格式:"yyyy-MM-dd HH"
*/
ONLY_HOUR{public String getValue(){return "yyyy-MM-dd HH";}},
/**
* 格式:"yyyy-MM-dd HH:mm"
*/
ONLY_MINUTE{public String getValue(){return "yyyy-MM-dd HH:mm";}},
/**
* 格式:"MM-dd"
*/
ONLY_MONTH_DAY{public String getValue(){return "MM-dd";}},
/**
* 格式:"MM-dd HH:mm"
*/
ONLY_MONTH_SEC{public String getValue(){return "MM-dd HH:mm";}},
/**
* 格式:"HH:mm:ss"
*/
ONLY_TIME{public String getValue(){return "HH:mm:ss";}},
/**
* 格式:"HH:mm"
*/
ONLY_HOUR_MINUTE{public String getValue(){return "HH:mm";}};
public abstract String getValue();
}
/**
* 获取当前时间
* @return 返回当前时间,格式2017-05-04 10:54:21
*/
public static String getNowDate(DatePattern pattern){
String dateString = null;
Calendar calendar = Calendar.getInstance();
Date dateNow = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat(pattern.getValue(),Locale.CHINA);
dateString = sdf.format(dateNow);
return dateString;
}
/**
* 将一个日期字符串转换成Data对象
* @param dateString 日期字符串
* @param pattern 转换格式
* @return 返回转换后的日期对象
*/
public static Date stringToDate(String dateString, DatePattern pattern){
Date date = null;
SimpleDateFormat sdf = new SimpleDateFormat(pattern.getValue(),Locale.CHINA);
try {
date = sdf.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 将date转换成字符串
* @param date 日期
* @param pattern 日期的目标格式
* @return
*/
public static String dateToString(Date date, DatePattern pattern){
String string = "";
SimpleDateFormat sdf = new SimpleDateFormat(pattern.getValue(), Locale.CHINA);
string = sdf.format(date);
return string;
}
/**
* 获取指定日期周几
* @param date 指定日期
* @return
* 返回值为: "周日", "周一", "周二", "周三", "周四", "周五", "周六"
*/
public static String getWeekOfDate(Date date){
String[] weekDays = { "周日", "周一", "周二", "周三", "周四", "周五", "周六" };
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (week < 0)
week = 0;
return weekDays[week];
}
/**
* 获取指定日期对应周几的序列
* @param date 指定日期
* @return 周一:1 周二:2 周三:3 周四:4 周五:5 周六:6 周日:7
*/
public static int getIndexWeekOfDate(Date date){
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int index = calendar.get(Calendar.DAY_OF_WEEK);
if(index == 1){
return 7;
}else{
return --index;
}
}
/**
* 返回当前月份
* @return
*/
public static int getNowMonth(){
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.MONTH) + 1;
}
/**
* 获取当前月号
* @return
*/
public static int getNowDay(){
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.DATE);
}
/**
* 获取当前年份
* @return
*/
public static int getNowYear(){
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.YEAR);
}
/**
* 获取本月份的天数
* @return
*/
public static int getNowDaysOfMonth(){
Calendar calendar = Calendar.getInstance();
return daysOfMonth(calendar.get(Calendar.YEAR),calendar.get(Calendar.DATE) + 1);
}
/**
* 获取指定月份的天数
* @param year 年份
* @param month 月份
* @return 对应天数
*/
public static int daysOfMonth(int year,int month){
switch(month){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
case 2:
if((year % 4 ==0 && year % 100 == 0) || year % 400 != 0){
return 29;
}else{
return 28;
}
default:
return -1;
}
}
}