1

java中当前日期的获取方法

旧方法（已不常用）：

int year = 0;

int month = 0;

int day = 0;

java.util.Date now = new java.util.Date();

year = now.getYear() + 1900;

month = now.getMonth() + 1;

day = now.getDate();

新方法：

SimpleDateFormat formatter = new SimpleDateFormat(“yyyy-mm-dd”);

Calendar cal_today = Calendar.getInstance();

int m_day = cal_today.get(cal_today.DAY_OF_MONTH);

int m_month = cal_today.get(cal_today.MONTH) + 1;

int m_hour = cal_today.get(cal_today.HOUR_OF_DAY);

int m_minute = cal_today.get(cal_today.MINUTE);

String d = formatter.format(cal_today.getTime());

我采用前一种方法实现了按日期生成文件夹.

2

jsp传给mysql当前系统时间的方法

insert into youDB(date) values(NOW())

不过这样只能获得当前日期

3 

判断要建立的文件夹是否存在,如果不则新建立一个文件夹

int year,mm,dd;
  String month,day;
  Date d1=new Date();
  year=d1.getYear()+1900;
  mm=d1.getMonth()+1;
  if (mm<10) month="0"+mm;
  else month=""+mm;
  dd=d1.getDate();
  if (dd<10) day="0"+dd;
  else day=""+dd;
  String filepath="d:\\upload"+"\\"+year+month+day+"\\";
  
  if(!new File(filepath).isDirectory())
        new File(filepath).mkdirs();