XMLHttpRequest下载文件，js下载文件，支持后台消息在前端页面提示

Posted 2022-12-01 棉晗榜

js

 //获取token
var token = sessionStorage.getItem('token');
var url = "/article/ExportEXCEL_PageOfOrderList?id=12312131&verifyKey=kkm";
var xhr = new XMLHttpRequest();
xhr.open('get', url);
xhr.responseType="blob";
xhr.setRequestHeader('token', token);
xhr.onload = function (e) 
    console.log(772, xhr);
    var contentType = xhr.getResponseHeader("content-type");
    console.log(779, contentType);

    if (contentType.indexOf("text/") != -1) 
        //后台消息提示
       //将blob转换为文本
        var utf8decoder = new TextDecoder();
          var fr = new FileReader();
          fr.readAsArrayBuffer(this.response);
          fr.onload = function(res) 
            var buffer = fr.result;
            var text = utf8decoder.decode(buffer);//String
            alert(text);
          
   
        return;
    
    var blob = new Blob([this.response],  type: contentType );
    if (this.status == 200) 
        var filenameHead = xhr.getResponseHeader("Content-disposition");
        console.log('filename=' + filenameHead);
 var urlArr = filenameHead.split(';')[1];
        console.log(urlArr);
    var filename = urlArr.split('=')[1];

        console.log('filename=' + filename);

        //var blob = this.response;
        var a = document.createElement('a');
        var urlTemp = URL.createObjectURL(blob);
        a.href = urlTemp;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        window.URL.revokeObjectURL(urlTemp);
    
;
xhr.send();

后台导出excel文件

[TokenFilter]
[HttpGet("ExportEXCEL_PageOfOrderList")]
public async Task<ActionResult> ExportEXCEL_PageOfOrderList([FromQuery] SelectWhere selectWhereStr)
	
	var result = await mq_DataDisposeBusiness.GetPageOfOrderList(selectWhereStr, 1, 40000);

	if (result.Code != ResultEnum.Success)
	
		if (result.ErrorMessage.Equals("未找到数据"))
		
			return Content("导出内容不能为空", "text/html;charset=UTF-8");
		              
		return Content(result.ErrorMessage, "text/html;charset=UTF-8");
	
	if (result.Payload.Total == 0)
	               
		return Content("导出内容不能为空", "text/html;charset=UTF-8");
	

	//生成EXCEL文件
	List<List<object>> exportData = new List<List<object>>();	 
	string columName = "条码号,样本类型,检测时间,科室名称,智能分类建议,溶血(mol/L),黄疸(mol/L),乳糜(mol/L),用户反馈";

	foreach (var item in result.Payload.List)
	
		var row = new List<object>();
		row.Add(item.OrderId);
		row.Add(item.OrderTypeName ?? "其它");//样本类型
		string time = "";
		if (item.OrderCreateTime.HasValue)
		
			time = item.OrderCreateTime.Value.ToString("yyyy-MM-dd HH:mm:ss");
		
		row.Add(time);//检测时间
		row.Add(item.Department);//科室名称
		row.Add(item.ResultStr);//智能分类建议
		row.Add(item.HNum.ToString() == "0" ? "--" : item.HNum.ToString());//溶血(mol/L)
		row.Add(item.INum.ToString() == "0" ? "--" : item.INum.ToString());//黄疸(mol/L)
		row.Add(item.LNum.ToString() == "0" ? "--" : item.LNum.ToString());//乳糜(mol/L)
		row.Add(item.UserLable);//用户反馈
		exportData.Add(row);
	

	string fileName = "样本查询" + DateTime.Now.Ticks + ".csv";
	string downUrl = $"/ CommonNameValueConfig.ExportDir/" + fileName;
	string path = AppDomain.CurrentDomain.BaseDirectory + System.IO.Path.Combine(CommonNameValueConfig.ExportDir, fileName);
	WebAPI_Serum.Model.CsvHelper.ExportMakeCsv(exportData, path, "样本导出", columName);

	return PhysicalFile(path, "application/octet-stream", fileName);