java获取当前日期前一天和后一天

/**
* 获得指定日期的前一天
* @param specifiedDay
* @return
* @throws Exception
*/
public static String getSpecifiedDayBefore(String specifiedDay){ 

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
String cDate = df.format(new Date());

Calendar c = Calendar.getInstance();
Date date=null;
try {
date = new SimpleDateFormat("yy-MM-dd").parse(cDate);
} 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){ 

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
String cDate = df.format(new Date());

Calendar c = Calendar.getInstance(); Date date=null; try { date = new SimpleDateFormat("yy-MM-dd").parse(cDate);
} 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; }