$.ajax({

type:"POST",

url:imgDir+"/TestAction.do?method=test",

data:"",

success:function(jsonStr){

var newwindow = window.open("about:blank","","height=300,width=600,toolbar=no,menubar=no,scrollbars=no,resizable=yes,location=no,status=yes");

newwindow.document.write(jsonStr);

}

});

response.setContentType("application/octet-stream");

response.setHeader("Content-Disposition","attachment; filename=\""

+ fileName + ".xls" +"\"");

PrintWriter tempOut = response.getWriter();

tempOut.write(string);

tempOut.close();