先下载

 引入js；

js代码：

var url = "${pageContext.request.contextPath}/exportExcel/exportMemberFile";            //实现Ajax下载文件            $.fileDownload(url, {                httpMethod : 'POST',                data : $("#form1").serialize(),                prepareCallback : function(url) {
   debugger                    $("#exportBtn").attr("disabled", true);                    $("#exportBtn").html("正在导出");                },                successCallback : function(url) {
   debugger                    $("#exportBtn").attr("disabled", false);                    $("#exportBtn").html("导出");                },                failCallback : function(html, url) {                    alert("导出失败");                }            });

后台response要进行如下设置;

response.setContentType("application/x-download");        response.setCharacterEncoding("utf-8");// 处理编码问题        response.setHeader("Content-Disposition",                "attachment;filename=" + new String(fileName.getBytes("gbk"), "iso8859-1") + ".xls");// 表头编码问题        Cookie fileDownload=new Cookie("fileDownload", "true");        fileDownload.setPath("/");        response.addCookie(fileDownload);

然后就可以用了