获取当前时间的前一天和后一天

package jp.co.hitachi_solutions.regasas.common;

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


/**
 * DateUtil
 */
public class DateUtil {

	/**
	* 当前日期的前一天
	* @param specifiedDay
	* @return
	* @throws Exception
	*/
	public static String getSpecifiedDayBefore(String specifiedDay){
		//SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
		Calendar c = Calendar.getInstance();
		Date date=null;
		try {
			date = new SimpleDateFormat("yyyyMMdd").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("yyyyMMdd").format(c.getTime());
		return dayBefore;
	}
	/**
	* 当前日期的后一天
	* @param specifiedDay
	* @return
	*/
	public static String getSpecifiedDayAfter(String specifiedDay){
		Calendar c = Calendar.getInstance();
		Date date=null;
		try {
			date = new SimpleDateFormat("yyyyMMdd").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("yyyyMMdd").format(c.getTime());
		return dayAfter;
	}
}