Excel-Printing With Jacob

public class JacobExcelPrinter {

    private ActiveXComponent excel;
    // excel workbooks 
    private Dispatch workbooks;
    // excel file varient
    private Variant workbook;

    public JacobExcelPrinter()
    {

    }
    /*
    * non-thread-safe
    */
    public void print(String filename)
    {
    try
    {
    // start the Excel 
    excel = new ActiveXComponent("Excel.Application");
    // first time, we need set the excel to be invisible
    excel.setProperty("Visible",new Variant(false));
    // get workbooks
    workbooks = excel.getProperty("WorkBooks").toDispatch();
    workbook = Dispatch.callN(workbooks,"Open",new Object[]{filename});

    // Dispatch.call(Dispatch.get(workbook.toDispatch(),"ActiveSheet").toDispatch(),"PrintOut");
    Dispatch.call(Dispatch.get(workbook.toDispatch(),"Worksheets").toDispatch(),"PrintOut");
    }
    finally
    {
    // quit the excel application
    excel.invoke("Quit",new Variant[]{});
    // invoke the method to count down the numbers of the reference,
    // and release them one by one to kill the excel process finally.
    ComThread.Release();
    }

    }

    /**
    * @param args
    */
    public static void main(String[] args) {
    JacobExcelPrinter printer = new JacobExcelPrinter();
    printer.print("c:/xx.xls");
    }

}