求教用jacob进行excel转换

Question

word转换已成功，excel转换出问题了，代码如下
ActiveXComponent  xl = new ActiveXComponent("Excel.Application");
try
    { 
        xl.setProperty("Visible", new Variant(false));
        boolean readonly = false;
        Object  workbooks = xl.getProperty("Workbooks").toDispatch();
        Object  workbook = Dispatch.invoke(workbooks,
                "Open", 
                Dispatch.Method, 
                                    new Object[]{paths,
                                    new Variant(false), 
                                    new Variant(false)},//是否以只读方式打开
                                    new int[1] ).toDispatch();
        Dispatch.invoke(workbook, "SaveAs", Dispatch.Method,
new Object[] { savepaths+filename, new Variant(2) },
new int[1]);
        Variant f = new Variant(false);
Dispatch.call(workbook, "Close", f);
} catch (Exception e) {
e.printStackTrace();
} finally {
xl.invoke("Quit", new Variant[] {});
}错误如下：
com.jacob.com.ComFailException: Invoke of: SaveAs
Source: Microsoft Office Excel
Description:  at com.jacob.com.Dispatch.invokev(Native Method)
at com.jacob.com.Dispatch.invoke(Dispatch.java)
at eb.hibernate.ToTxt.change(ToTxt.java:129)
at eb.hibernate.ToTxt.main(ToTxt.java:154)