POI导入2007EXCEL中遇到的文件描述符错误的问题

在导入07excel的时候出现的一个异常，错误的文件描述符或者报bad file descriptor

java.io.IOException: Bad file descriptor
at java.io.FileInputStream.readBytes(Native Method) at java.io.FileInputStream.read(FileInputStream.java:177) at org.apache.poi.util.IOUtils.copy(IOUtils.java:85) at org.apache.poi.util.PackageHelper.open(PackageHelper.java:50) at org.apache.poi.xssf.usermodel.XSSFWorkbook.(XSSFWorkbook.java:176) at com.kedacom.shop.web.action.DbWatchAction.main(DbWatchAction.java:464)
[/java]
测试代码如下：

public static void main(String[] args) throws IOException {
		File f = new File("/root/Desktop/111.xlsx");
		InputStream is = new FileInputStream(f);
		if (is != null) {
			Workbook book = null;
    try {
    		book = (Workbook) new HSSFWorkbook(is);
    } catch (Exception ex) {
    		try {
				//book = new XSSFWorkbook(is);//这里提供的这个输入流的构造方法一直报错，改为path之后就ok了
				book = new XSSFWorkbook("/root/Desktop/111.xlsx");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				is.close();
			}
	       }
		}
}