Java获取当前时间年月日的方法

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); 
  } 
}