Java代码生成年周和日期

有时候我们需要后台生成年周日期这样的格式，比如Java生成导入Excel的时候需要一列时间。

效果展示：



代码展示：

package com.hellojava;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

public class Test1

{

public static void main(String[] args)
{

SimpleDateFormat sdf = new SimpleDateFormat("yyyy年第w周");
String ssb = null;
for(int i=-105;i<0;i++){
Calendar c = new GregorianCalendar(); 
c.setFirstDayOfWeek(Calendar.MONDAY); 
c.setMinimalDaysInFirstWeek(7);
c.add(Calendar.WEEK_OF_YEAR,i);
String sp = sdf.format(c.getTime());
String str = sp.split("第")[1].split("周")[0];
String strYear = sp.split("年")[0];
String s =  (Integer.parseInt(strYear)+1)+"";
if(str.equals("52")){
if(resetDate(strYear+"年第53周").equals(resetDate(s.trim()+"年第1周"))){
sp = sdf.format(c.getTime());
}else{
String d = resetDate(sdf.format(c.getTime()));
String day = d.split("-")[2];
if(Integer.parseInt(day)<31){
System.out.println(sp+resetDate(sp));
sp=strYear+"年第53周";
}
}
ssb = strYear;
}
if(str.equals("1")){
if{ssb.equals(strYear)}{
sp=s+"年第1周";
}
}
System.out.println(sp+resetDate(sp));

}
}

private static String resetDate(String strWeek)
{
strWeek = strWeek.replace("年第", "-").replace("周", "");
String[] array = strWeek.split("-");
int year = Integer.parseInt(array[0]);
int week = Integer.parseInt(array[1]);
int firstDay = getDayOfWeek(year + "", "01", "01");
if (firstDay > 4)
{
week += 1;
}
return getStartDayOfWeek(year, week) + "~" + getEndDayOfWeek(year, week);
}

    

    private static Calendar getCalendarFormYear(int year){  

        Calendar cal = Calendar.getInstance();

        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);        

        cal.set(Calendar.YEAR, year);  

        return cal;  

    }

    

    private static String getStartDayOfWeek(int year,int weekNo){  

        Calendar cal = getCalendarFormYear(year);  

        cal.set(Calendar.WEEK_OF_YEAR, weekNo);  

        return (cal.get(Calendar.MONTH) + 1) + "-" + cal.get(Calendar.DAY_OF_MONTH);      

          

    }

    

    private static String getEndDayOfWeek(int year,int weekNo){  

        Calendar cal = getCalendarFormYear(year);  

        cal.set(Calendar.WEEK_OF_YEAR, weekNo);  

        cal.add(Calendar.DAY_OF_WEEK, 6);  

        return (cal.get(Calendar.MONTH) + 1) + "-" + cal.get(Calendar.DAY_OF_MONTH);      

    }

    

    private static int getDayOfWeek(String year, String month, String day)
{
SimpleDateFormat format = new SimpleDateFormat("u");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = null;
try
{
date = sdf.parse(year + "-" + month + "-" + day);
}
catch (Exception e)
{
e.printStackTrace();
}
String dayOfweek = format.format(date);
return dayOfweek.equals("1") ? 1 : dayOfweek.equals("2") ? 2 : dayOfweek.equals("3") ? 3 : dayOfweek.equals("4") ? 4 : dayOfweek.equals("5") ? 5 : dayOfweek.equals("6") ? 6 : 0;
}

    

}

注意事项：

此段代码建立在JDK1.7以上才能运行