··怎样将日期字符串转换成日期型，并提前一天？

Question

<%@ page import= "java.text.SimpleDateFormat"%>
<%@ page import= "java.util.*"%>
<%
String sD="2003/10/04";
Date d;
d=new Date(sD);
String aa = new SimpleDateFormat("yyyy.MM.dd").format(d);
out.println(aa);
%>

Answer 1

Calendar date=Calendar.getInstance();
    String str="1978-2-28";
    String year="", month="",day="";
    StringTokenizer stk=new StringTokenizer(str,"-");
    year=stk.nextToken();
    month=stk.nextToken();
    day=stk.nextToken();
    date.set(Integer.parseInt(year),Integer.parseInt(month)-1,Integer.parseInt(day)+1);

Answer 2

//    public static String yesterday(String today) {
    public static Date yesterday(String today) {        String yesterday = "";
        SimpleDateFormat df = new SimpleDateFormat("yyyy.MM.dd");
        Date date = null;
        try {
            date = df.parse(today);
        } catch (ParseException e) {
            System.out.println(e);
            return yesterday;
        }
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.DATE, -1);
 //       yesterday= df.format(cal.getTime());
 //       return yesterday;
        return cal.getTime();    }

Answer 3

cricketlj(蟋蟀) ：怎样将aa日期减1阿？

Answer 4

aku0708(阿酷) ：java.sql下没有date类啊，我用的是1.3

Answer 5

这样 -1<%@ page import= "java.text.SimpleDateFormat"%>
<%@ page import= "java.util.*"%>
<%
String sD="2003/10/04";
Date d;
d=new Date(sD);Calendar cal = Calendar.getInstance();
        cal.setTime(d);
        cal.add(Calendar.DATE, -1);
String aa= new SimpleDateFormat("yyyy.MM.dd").format(cal.getTime());out.println(aa);
%>