/** 
     * @Author： 
     * @Description：更加输入日期，获取输入日期的前一天 
     * @Date： 
     * @strData：参数格式：yyyy-MM-dd 
     * @return：返回格式：yyyy-MM-dd 
     */ 
    public static String getPreDateByDate(String strData) { 
        String preDate = ""; 
         Calendar c = Calendar.getInstance(); 
         SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd"); 
         Date date = null; 
         try { 
             date = sdf.parse(strData); 
         } catch (java.text.ParseException e) { 
             e.printStackTrace(); 
         } 
          
         c.setTime(date); 
         int day1 = c.get(Calendar.DATE); 
         c.set(Calendar.DATE, day1 - 1); 
         preDate = sdf.format(c.getTime()); 
        return preDate; 
    } 
    

 import java.util.Calendar; 
import java.util.Date; 
import java.util.List; 
import java.text.SimpleDateFormat; 
 
//获取从2018-02-05到2018-10-15号之间所有的周一到周日的日期 
    public static void getWeekdays(){ 
        String monitorDate = "2018-02-"; 
        String startDate = ""; 
        String endDate = ""; 
        String dateRange = ""; 
        int mon = 2; 
        for(int i=5;i<=260;) { 
            if (endDate.length() == 0) { 
                startDate = monitorDate + i; 
            } else{ 
                startDate = getSixthDateByDate(endDate,1); 
            } 
            endDate = getSixthDateByDate(startDate,6); 
            System.out.println(startDate+": "+endDate); 
            dateRange = startDate + endDate; 
            dateRange= dateRange.replace("-",""); 
            System.out.println(dateRange); 
            System.out.println("\n"); 
            i+=7; 
        } 
    } 
    /** 
     * @Author： 
     * @Description：更加输入日期，获取输入日期后的第一天 
     * @startData：参数格式：yyyy-MM-dd 
     * @day：day=1,获取输入日期的第一天；day=2,获取输入日期的第二天；day=n,获取输入日期的第n天 
     * @return：返回格式：yyyy-MM-dd 
     */ 
    public static String getSixthDateByDate(String startData,int day) { 
        String preDate = ""; 
        Calendar c = Calendar.getInstance(); 
        SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd"); 
        Date date = null; 
        try { 
            date = sdf.parse(startData); 
        } catch (java.text.ParseException e) { 
            e.printStackTrace(); 
        } 
 
        c.setTime(date); 
        int day1 = c.get(Calendar.DATE); 
        //c.set(Calendar.DATE, day1 +6);获取输入日期后的第一天 
        c.set(Calendar.DATE, day1 +day); 
        preDate = sdf.format(c.getTime()); 
        return preDate; 
    }

  //获取今天是星期几. 1：周一；2：周二；3：周三....以此类推 
    public static int getCurrentDayofweek() { 
        //今天是几号  
        Date date=new Date();  
        Calendar c=Calendar.getInstance();  
        c.setTime(date);  
        //今天是这个星期的第几天  
        int week=c.get(Calendar.DAY_OF_WEEK)-1;  
        return week; 
    }