用jsp调用出现无法执行new XSSFWorkbook的情况,也无报错，请问问?报错

poi读取xlsx格式的程序单独运行正确 用jsp调用出现无法执行new XSSFWorkbook的情况,也无报错

public class Forexecute extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        XSSFWorkbook  rwb = null;
        MultipartFormDataRequest mrequest = null;
        try{            
            rwb = new XSSFWorkbook(new BufferedInputStream(new FileInputStream(new File("D:\\qzworkspace\\1.xlsx"))));
            // 读取第一章表格内容 
            XSSFSheet sheet = rwb.getSheetAt(0); 
            // 定义 row、cell 
            XSSFRow row; 
            String cell; 
            // 循环输出表格中的内容 
            for (int i = sheet.getFirstRowNum()+1; i < sheet.getPhysicalNumberOfRows(); i++) { 
                row = sheet.getRow(i); 
                for (int j = row.getFirstCellNum(); j < row.getPhysicalNumberOfCells(); j++) { 
                    // 通过 row.getCell(j).toString() 获取单元格内容， 
                    cell = row.getCell(j).toString(); 
                    System.out.print(cell + "\t"); 
                } 
                System.out.println(""); 
            }
            }catch(Exception e) {
                System.out.println("已运行xlRead() : " + e );
            }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

    public static void main(String args[]) throws ServletException, IOException
    {
        Forexecute er = new Forexecute();
        HttpServletRequest request = null;
        HttpServletResponse response=null;
        er.doGet(request, response);
    }
}

上面是我java部分的程序，单独执行main函数调用poi读取excel没有问题，但是用jsp调用这个方法就会在执行new XSSFWorkbook（）处停止，也无任何报错，求大神们帮帮忙看一下。