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我通过单击按钮将 jqgrid 中显示的数据导出到 .excel 文件中。这是我的导出到excel按钮的代码点击..

 $('#excel').click(function(){
            var fromdate=$('#fromdate').val();
            var todate=$('#todate').val();
            if(fromdate && todate)
            {
                var URL='excel?fromdate='+$('#fromdate').val()+'&todate='+$('#todate').val();
                $.ajax({
                   url:URL,
                   type:'GET',
                   success:function(data){
                       alert('Exported To Excel');
                   }

                });
            }
        });

现在这个按钮将指向 servlet 的 excel.java 页面。下面是我的 exceljava 页面代码。现在根据我的需要，当用户单击导出到 excel 按钮时，应该会弹出一个 openwith 并保存为对话框，这使用户能够提供所需的命名并保存到所需的位置但是这段代码没有发生。请指出我的错误..

excel.java

  try {

    response.setHeader("Content-Type", "application/vnd.ms-excel");
    response.setHeader("Content-Disposition","attachment; filename=excel.xls");

    String datum1 = request.getParameter("fromdate");
    String datum2 = request.getParameter("todate");
    SimpleDateFormat sdfSource = new SimpleDateFormat("dd-MM-yyyy");
    Date date = sdfSource.parse(datum1);
    Date date2 = sdfSource.parse(datum2);
    SimpleDateFormat sdfDestination = new SimpleDateFormat("yyyy-MM-dd");
    datum1 = sdfDestination.format(date);
    System.out.println(datum1);
    datum2 = sdfDestination.format(date2);
    System.out.println(datum2);


    HSSFWorkbook hwb = new HSSFWorkbook();
    HSSFSheet sheet = hwb.createSheet("CallBillingSystem");

    HSSFRow rowhead = sheet.createRow((short) 0);
    rowhead.createCell((short) 0).setCellValue("calldate");
    rowhead.createCell((short) 1).setCellValue("src");
    rowhead.createCell((short) 2).setCellValue("dst");
    rowhead.createCell((short) 3).setCellValue("dstchannel");
    rowhead.createCell((short) 4).setCellValue("lastapp");
    rowhead.createCell((short) 5).setCellValue("duration");
    rowhead.createCell((short) 6).setCellValue("disposition");
    rowhead.createCell((short) 7).setCellValue("amaflags");
    rowhead.createCell((short) 8).setCellValue("cdrcost");


    String strQuery = "";
    ResultSet rs = null;

    conexion conexiondb = new conexion();
    conexiondb.Conectar();

    strQuery = "SELECT * FROM cdrcost where date(calldate) between '" + datum1 + "' and '" + datum2 + "'";

     //strQuery = "SELECT * FROM cdrcost where date(calldate) between '2011-09-01' and '2012-01-01'";

    rs = conexiondb.Consulta(strQuery);
    int i = 1;
    while (rs.next()) {
        HSSFRow row = sheet.createRow((short) i);
        row.createCell((short) 0).setCellValue(rs.getString("calldate"));
        row.createCell((short) 1).setCellValue(rs.getString("src"));
        row.createCell((short) 2).setCellValue(rs.getString("dst"));
        row.createCell((short) 3).setCellValue(rs.getString("dstchannel"));
        row.createCell((short) 4).setCellValue(rs.getString("lastapp"));
        row.createCell((short) 5).setCellValue(rs.getString("duration"));
        row.createCell((short) 6).setCellValue(rs.getString("disposition"));
        row.createCell((short) 7).setCellValue(rs.getString("amaflags"));
        row.createCell((short) 8).setCellValue(rs.getString("cdrcost"));
        i++;
    }
    FileOutputStream fileOut = new FileOutputStream(filename);
    hwb.write(fileOut);     
    hwb.write(response.getOutputStream());
    System.out.println("Your excel file has been generated!");
    FileOut.close();
} catch (Exception ex) {
    System.out.println(ex);

}

}
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