java日期时间各种变换及处理

深藏阁楼爱情的钟 2022-05-25 08:20 206阅读 0赞

本文作者：合肥工业大学 管理学院 钱洋 email：1563178220@qq.com 内容可能有不到之处，欢迎交流。  
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# java处理时间 #

个人在平时写程序的时候，会遇到将字符型转化为时间、或者获取当期时间，昨天的时间，获取当前月，当前日，当前季度等等。为此，本人写了一个时间处理类，希望对大家有帮助。其中，该类中的函数，可能还会在以后遇到问题时，继续扩充。

# 程序 #

package util;
    
    import java.text.DateFormat;
    import java.text.DecimalFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.List;
    /** * @author:合肥工业大学 管理学院 钱洋 * @email:1563178220@qq.com * @ */
    public class TimeUtils { 
    
        public static void main( String[] args ) throws ParseException{
            List<String> monthlist = TimeUtils.YearMonth(2017,2018);
            for (int i = 0; i < monthlist.size(); i++) {
                System.out.println(monthlist.get(i));
            }
            String time = getMonth("2002-1-08 14:50:38");
            System.out.println(time);
            System.out.println(getDay("2002-1-08 14:50:38"));
            System.out.println(TimeUtils.parseTime("2016-05-19 19:17","yyyy-MM-dd HH:mm"));
            String data=getNowMonth();
            System.out.println(data);
        }
        //获取当前时间
        public static String GetNowDate(String formate){  
            String temp_str="";  
            Date dt = new Date();  
            SimpleDateFormat sdf = new SimpleDateFormat(formate);  
            temp_str=sdf.format(dt);  
            return temp_str;  
        }  
        //获取当前月
        public static String getMonth( String time ){
    
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            Date date = null;
            try {
    
                date = sdf.parse(time);
                Calendar cal = Calendar.getInstance();
                cal.setTime(date);
    
            } catch (ParseException e) {
                e.printStackTrace();
            }
    
            return sdf.format(date);
    
        }
        //获取当前日期
        public static String getDay( String time ){
    
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            Date date = null;
            try {
    
                date = sdf.parse(time);
                Calendar cal = Calendar.getInstance();
                cal.setTime(date);
    
            } catch (ParseException e) {
                e.printStackTrace();
            }
    
            return sdf.format(date);
    
        }
        //输入时间，解析成"yyyy-MM-dd HH:mm:ss"格式
        public static Date parseTime(String inputTime) throws ParseException{
    
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
            Date date = sdf.parse(inputTime); 
    
            return date;
    
        }
        //将时间转成成字符型
        public static String dateToString(Date date, String type) { 
            DateFormat df = new SimpleDateFormat(type);  
            return df.format(date);  
        }
        //将输入的时间，转化成指定格式
        public static Date parseTime(String inputTime, String timeFormat) throws ParseException{
    
            SimpleDateFormat sdf = new SimpleDateFormat(timeFormat);  
            Date date = sdf.parse(inputTime); 
    
            return date;
    
        }
    
        public static Calendar parseTimeToCal(String inputTime, String timeFormat) throws ParseException{
    
            SimpleDateFormat sdf = new SimpleDateFormat(timeFormat);  
            Date date = sdf.parse(inputTime); 
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);
    
            return calendar;
    
        }
    
        public static int getDaysBetweenCals(Calendar cal1, Calendar cal2) throws ParseException{
    
            return (int) ((cal2.getTimeInMillis()-cal1.getTimeInMillis())/(1000*24*3600));
    
        }
        //长整型转化为时间
        public static Date parseTime(long inputTime){
    
            // SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date= new Date(inputTime);
            return date;
    
        }
    
        public static String parseTimeString(long inputTime){
    
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date= new Date(inputTime);
            return sdf.format(date);
    
        }
        public static String parseStringTime(String inputTime){
    
            String date=null;
            try {
                Date date1 = new SimpleDateFormat("yyyyMMddHHmmss").parse(inputTime);
                date=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date1);
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    
            return date;
        }
        public static List<String> YearMonth(int year) {
            List<String> yearmouthlist=new ArrayList<String>();
            for (int i = 1; i < 13; i++) {
                DecimalFormat dfInt=new DecimalFormat("00");
                String sInt = dfInt.format(i);
                yearmouthlist.add(year+sInt);
            }
    
            return yearmouthlist;
        } 
        //获取从起始年份到目标年份所有的月
        public static List<String> YearMonth(int startyear,int finistyear) {
            List<String> yearmouthlist=new ArrayList<String>();
            for (int i = startyear; i < finistyear+1; i++) {
                for (int j = 1; j < 13; j++) {
                    DecimalFormat dfInt=new DecimalFormat("00");
                    String sInt = dfInt.format(j);
                    yearmouthlist.add(i +""+sInt);
                }
            }
            return yearmouthlist;
        } 
        public static List<String> TOAllDay(int year){
            List<String> daylist=new ArrayList<String>();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 
            int m=1;//月份计数 
            while (m<13) 
            { 
                int month=m; 
                Calendar cal=Calendar.getInstance();//获得当前日期对象 
                cal.clear();//清除信息 
                cal.set(Calendar.YEAR,year); 
                cal.set(Calendar.MONTH,month-1);//1月从0开始 
                cal.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 
    
                System.out.println("##########___" + sdf.format(cal.getTime())); 
    
                int count=cal.getActualMaximum(Calendar.DAY_OF_MONTH); 
    
                System.out.println("$$$$$$$$$$________" + count); 
    
                for (int j=0;j<=(count - 2);) 
                { 
                    cal.add(Calendar.DAY_OF_MONTH,+1); 
                    j++; 
                    daylist.add(sdf.format(cal.getTime()));
                } 
                m++; 
            } 
            return daylist;
        }
        //获取昨天的日期
        public static String getyesterday(){
            Calendar   cal   =   Calendar.getInstance();
            cal.add(Calendar.DATE,   -1);
            String yesterday = new SimpleDateFormat( "yyyy-MM-dd ").format(cal.getTime());
            return yesterday;
        }
        //获取当前年份月份
        public static String getNowMonth(){
            Calendar   cal   =   Calendar.getInstance();
            int year = cal.get(Calendar.YEAR);    
            int month = cal.get(Calendar.MONTH) + 1; 
            DecimalFormat dfInt=new DecimalFormat("00");
            String sInt = dfInt.format(month);
            return year+""+sInt;
        }
    }