现在写一个最简单demo，使用到的jar包：当前目录下的poi-2.5.1-final-20040804.jar
http://download1.csdn.net/down3/20070521/21113925939.jar
import java.util.Date;
import java.text.SimpleDateFormat;
public class Test {
public static void main(String[] args) {
Date date = new Date();
String strDate = "";
SimpleDateFormat format = new SimpleDateFormat();
format.applyPattern("yyyy-MM-dd HH:mm:ss");
strDate = format.format(date);
System.out.println(strDate);
format.applyPattern("yyyy-MM-dd");
strDate = format.format(date);
System.out.println(strDate);
format.applyPattern("yyyyMMddHHmmss");
strDate = format.format(date);
System.out.println(strDate);
format.applyPattern("yyyy'年'MM'月'dd'日'");
strDate = format.format(date);
System.out.println(strDate);
}
}