Export gwt grid to Excel

I have a problem i get the grid data with js and i have my servlet to
open xls but i don´t know how to send data from clien side to servlet,
and i don´t want to send by url this is my example

-------Button--------------------
IButton export = new IButton("Export");
export.addClickHandler(new ClickHandler() {

@Override
public void onClick(ClickEvent event) {

StringBuilder exportedCSV = exportCSV(grid);
System.out.println(exportedCSV);

Window.Location.replace(GWT.getModuleBaseURL()+"export");

}
});

------------------Get data from grid------------

private StringBuilder exportCSV(ListGrid listGrid) {
StringBuilder stringBuilder = new StringBuilder(); // csv data in
here

// column names
ListGridField[] fields = listGrid.getFields();
for (int i = 0; i < fields.length; i++) {
ListGridField listGridField = fields[i];
stringBuilder.append("\"");
stringBuilder.append(listGridField.getName());
stringBuilder.append("\",");
}
stringBuilder.deleteCharAt(stringBuilder.length() - 1); // remove
last
// ","
stringBuilder.append("\n");

// column data
ListGridRecord[] records = listGrid.getRecords();
for (int i = 0; i < records.length; i++) {
ListGridRecord listGridRecord = records[i];
ListGridField[] listGridFields = listGrid.getFields();
for (int j = 0; j < listGridFields.length; j++) {
ListGridField listGridField = listGridFields[j];
stringBuilder.append("\"");
stringBuilder.append(listGridRecord.getAttribute(listGridField
.getName()));
stringBuilder.append("\",");
}
stringBuilder.deleteCharAt(stringBuilder.length() - 1); // remove
// last ","
stringBuilder.append("\n");
}
return stringBuilder;
}

-----------------servelt------------------------

public class ExcelServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest request, HttpServletResponse
response) throws IOException {

OutputStream out = null;
try {

response.setContentType("application/vnd.ms-excel");
response.setHeader
("Content-Disposition", "attachment; filename=Prueba.xls");
WritableWorkbook w =
Workbook.createWorkbook(response.getOutputStream());
WritableSheet s = w.createSheet("Probando", 0);
s.addCell(new Label(0, 0, "Hello World"));
w.write();
w.close();
}
catch (Exception e){
try {
throw new ServletException("Exception in Excel Sample
Servlet", e);
} catch (ServletException e1) {
e1.printStackTrace();
}
}
finally{
if (out != null)
out.close();
}

}

}

i want to know how in button i can send data to servlet

thks

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