java日期获取前一天和后一天

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {

   public static void main(String[] args) {
       Date date = new Date();
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
       String specifiedDay = sdf.format(date);
       System.out.println(getSpecifiedDayBefore(specifiedDay));
       System.out.println(getSpecifiedDayAfter(specifiedDay));
   }

   /**
   * 获得指定日期的前一天
   *
   * @param specifiedDay
   * @return
   * @throws Exception
   */
   public static String getSpecifiedDayBefore(String specifiedDay) {
       Calendar c = Calendar.getInstance();
       Date date = null;
       try {
           date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
       } catch (ParseException e) {
           e.printStackTrace();
       }
       c.setTime(date);
       int day = c.get(Calendar.DATE);
       c.set(Calendar.DATE, day - 1);

String dayBefore = new SimpleDateFormat("yyyy-MM-dd").format(c
               .getTime());
       return dayBefore;
   }

/**
   * 获得指定日期的后一天
   *
   * @param specifiedDay
   * @return
   */
   public static String getSpecifiedDayAfter(String specifiedDay) {
       Calendar c = Calendar.getInstance();
       Date date = null;
       try {
           date = new SimpleDateFormat("yy-MM-dd").parse(specifiedDay);
       } catch (ParseException e) {
           e.printStackTrace();
       }
       c.setTime(date);
       int day = c.get(Calendar.DATE);
       c.set(Calendar.DATE, day + 1);

String dayAfter = new SimpleDateFormat("yyyy-MM-dd")
               .format(c.getTime());
       return dayAfter;
   }
}

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java日期获取前一天和后一天

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