JAVA另存excel文件

Question

很简单一个功能，用JXL或者POI都可以 ，把一个EXCEL文件另存一下就行了，比如2.xls另存为3.xls ，内容不变。我是用JXL做的，导出之后3是空的。新手 ，帮忙看看。
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.WritableWorkbook;

public class text {
private static String inn = "d:\\2.xls";
private static String ott = "d:\\3.xls";

public static void copy(String inname,String outname) throws BiffException, IOException {

Workbook workbook = Workbook.getWorkbook(new File(inname));

WritableWorkbook outExcel =Workbook.createWorkbook(new File(outname),workbook);

}
public static void main(String[] args) throws BiffException, IOException {
copy(inn,ott);
}
}

Answer 1

应该是少一句：outExcel .write();