struts 导出excel 客户端保存

自己的一个函数，主要是Response的使用，把生成的excel数据导出九可以了

 public String exportExcel()
    {
        //FileOutputStream fos=null;
        HSSFWorkbook wbError = new HSSFWorkbook();
        HSSFSheet sheetError=wbError.createSheet();
        HSSFRow rowHeader=sheetError.createRow(0);
        rowHeader.createCell(0).setCellValue("Hello");
        try
        {
            ActionContext ctx = ActionContext.getContext();
            HttpServletResponse res = (HttpServletResponse)ctx.get(ServletActionContext.HTTP_RESPONSE);
            res.setContentType("application/vnd.ms-excel;charset=GBK");
            res.setHeader("Content-Disposition","attachment;Filename=message.xls");
            OutputStream outStream = res.getOutputStream();
           // fos = new FileOutputStream(ServletActionContext.getServletContext().getRealPath("/resources/export.xls"));
            wbError.write(outStream);
            outStream.flush();
            outStream.close();
            return SUCCESS;
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
            return INPUT;
        }
    }