Java获取当前时间的年月日方法

 package com.ob;  

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

 public class DateTest {  

     public static void main(String[] args) throws ParseException {
         Calendar now = Calendar.getInstance();
         System.out.println("年: " + now.get(Calendar.YEAR));
         System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + "");
         System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH));
         System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY));
         System.out.println("分: " + now.get(Calendar.MINUTE));
         System.out.println("秒: " + now.get(Calendar.SECOND));
         System.out.println("当前时间毫秒数：" + now.getTimeInMillis());
         System.out.println(now.getTime());  

         Date d = new Date();
         System.out.println(d);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         String dateNowStr = sdf.format(d);
         System.out.println("格式化后的日期：" + dateNowStr);  

         String str = "2012-1-13 17:26:33";  //要跟上面sdf定义的格式一样
         Date today = sdf.parse(str);
         System.out.println("字符串转成日期：" + today);
     }
 }  

输出结果：

年: 2012
月: 1
日: 13
时: 17
分: 28
秒: 19
当前时间毫秒数：1326446899902
Fri Jan 13 17:28:19 CST 2012
Fri Jan 13 17:28:19 CST 2012
格式化后的日期：2012-01-13 17:28:19
字符串转成日期：Fri Jan 13 17:26:33 CST 2012