获取指定月 获取指定日期是星期几

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public static List<ExcelDateHead> getByMonth(String date){
    DateFormat dateFormat=new SimpleDateFormat("yyyy-MM");
    Calendar c = Calendar.getInstance();
    try {
        c.setTime(dateFormat.parse(date));
    } catch (ParseException e) {
        // TODO: handle exception
        return null;
    }
    int firstDay=c.getMinimum(Calendar.DAY_OF_MONTH);
    int endDay=c.getActualMaximum(Calendar.DAY_OF_MONTH);
     
    List<ExcelDateHead> list=new ArrayList<ExcelDateHead>();
    for (int i = firstDay; i <= endDay; i++) {
        c.set(Calendar.DAY_OF_MONTH, i);
        //c.add(Calendar.DAY_OF_MONTH, 1);
        String dayOfWeek=getWeekOfDate(c.getTime());
        int weekint=c.get(Calendar.WEEK_OF_MONTH);
        String weeks="";
        weeks=getweekOfMonth(weekint);
        String day=String.valueOf(i);
        int index=weekOfExist(weeks,list);
        if(index==-1){
            ExcelDateHead excelDateHead=new ExcelDateHead();
            excelDateHead.setWeekOfMonth(weeks);
            ExcelDateBody excelDateBody=new ExcelDateBody();
            excelDateBody.setDay(day);
            excelDateBody.setWeek(dayOfWeek);
            excelDateBody.setDetail(c.getTime());
            excelDateHead.getBody().add(excelDateBody);
            list.add(excelDateHead);
        }else {
            ExcelDateBody excelDateBody=new ExcelDateBody();
            excelDateBody.setWeek(dayOfWeek);
            excelDateBody.setDay(day);
            excelDateBody.setDetail(c.getTime());
            list.get(index).getBody().add(excelDateBody);
        }
    }
    return list;
}
 
 
 
 
/** * 获取指定日期是星期几
  * 参数为null时表示获取当前日期是星期几
  * @param date
  * @return
*/
public static String getWeekOfDate(Date date) {     
    String[] weekOfDays = {"日", "一", "二", "三", "四", "五", "六"};       
    Calendar calendar = Calendar.getInstance();     
    if(date != null){       
         calendar.setTime(date);     
    }       
    int w = calendar.get(Calendar.DAY_OF_WEEK) - 1;     
    if (w < 0){       
        w = 0;     
    }     
    return weekOfDays[w];   
}
 
 
public static String getweekOfMonth(int week){
    String[] weeks={"第一周","第二周","第三周","第四周","第五周","第六周"};
    //System.out.println(week);
    int a=week-1;
    if(a<0){
        a=0;
    }
    return weeks[a];
}
 
public static int weekOfExist(String weeks,List<ExcelDateHead> list){
    for (int i = 0; i < list.size(); i++) {
        if(list.get(i).getWeekOfMonth().equals(weeks)){
            return i;
        }
    }
    return -1;
}

  

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