前端代码（参考）：

$("#import").on('click', function(){var createDate=$("#createdDate").val();var key1=$("#key1").val();if(createDate==null||createDate==""){layer.msg("请选择创建时间段！在点击导出数据）");return ;}var load = layer.load();//原生ajaxvar xhr = new XMLHttpRequest();//post方式请求后台的路径xhr.open('post', gatewayServerUrl+'/execute/openApi/importByCreate2', true);//导出的Excel是二进制数据类型，所以设置为blobxhr.responseType = 'blob';//请求头（key,value），请求头可以设置多个key-value对xhr.setRequestHeader('Content-Type', 'application/json;charset=utf-8');//返回成功，导出的Excel文件xhr.onload = function () {if (this.status == 200) {layer.close(load);var blob = this.response;var a = document.createElement('a');var url = window.URL.createObjectURL(blob);a.href = url;//设置文件名称a.download = '产品完检管理【'+createDate+'】.xlsx';a.click();}}//请求的参数，json格式，后台要用json格式接收xhr.send(JSON.stringify({"createDate" : createDate,"key1":key1}));});

后端代码（参考）：

List<ManuProductCheckExport> list = new ArrayList<>();
OutputStream out = response.getOutputStream();
//文件名需要这样写，不能在setHeader直接写中文名，否则下载的文件名字为空，只有后缀
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setCharacterEncoding("utf-8");
String fileName = URLEncoder.encode("导出数据产品完检", "UTF-8").replaceAll("\\+", "%20");
response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
ExcelWriter excelWriter = EasyExcelFactory.write(out).build();
EasyExcel.write(response.getOutputStream(), ManuProductCheckExport.class).sheet("sheet").doWrite(list);
excelWriter.finish();
out.flush();
out.close();

依赖：

<!-- easyexcel导入导出 -->
<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>2.2.7</version>
</dependency>