java date实现加一天代码，其他天数的一次类推

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

public class $ {

public static void main(String[] args) {
Format f = new SimpleDateFormat("yyyy-MM-dd");

Date today = new Date();
System.out.println("今天是:" + f.format(today));

Calendar c = Calendar.getInstance();
c.setTime(today);
c.add(Calendar.DAY_OF_MONTH, 1);// 今天+1天

Date tomorrow = c.getTime();
System.out.println("明天是:" + f.format(tomorrow));
}
}

结果：
今天是:2013-10-09
明天是:2013-10-10

public List exportOneweekinfo() throws HibernateException{
Session session = HibernateSessionFactory.getSession();
Transaction tx = session.beginTransaction();
Format ctime = new SimpleDateFormat("yyyy-MM-dd");
Date today = new Date();
String todaydate = ctime.format(today);   //当前时间日期
Calendar c = Calendar.getInstance();
c.setTime(today);
c.add(Calendar.DAY_OF_MONTH, -7);
Date  before = c.getTime();
String beforeweekdate = ctime.format(before);    //一周开始的时间
System.out.println("todaydate"+todaydate);
System.out.println("beforweekdate"+beforeweekdate);
Query query = session.createQuery("select e from Information as e where e.reporttime>='"+beforeweekdate+"' and e.reporttime <= '"+ todaydate +"'");   //hql语句
//        query.setMaxResults(20);  //设置最大显示的个数
List list = query.list();
tx.commit();
HibernateSessionFactory.closeSession();
return list;
}