你需要返回File({file_to_download}， "application/vnd.ms-excel")从后端到前端，在你的js文件中，你需要更新下面写的代码:

function exportToExcel() {
        
        axios.post({path to call your controller}, null,
            {
                headers:
                {
                    'Content-Disposition': "attachment; filename=XYZ.xlsx",
                    'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
                },
                responseType: 'arraybuffer',
            }
        ).then((r) => {
            const path= window.URL.createObjectURL(new Blob([r.data]));
            const link = document.createElement('a');
            link.href = path;
            link.setAttribute('download', 'XYZ.xlsx');
            document.body.appendChild(link);
            link.click();
        }).catch((error) => console.log(error));
    }

当响应带有可下载文件时，响应头将类似于

Content-Disposition: "attachment;filename=report.xls"
Content-Type: "application/octet-stream" // or Content-type: "application/vnd.ms-excel"

您可以创建一个单独的组件，该组件将包含一个隐藏的iframe。

  import * as React from 'react';

  var MyIframe = React.createClass({

     render: function() {
         return (
           <div style={{display: 'none'}}>
               <iframe src={this.props.iframeSrc} />
           </div>
         );
     }
  });

现在，你可以将可下载文件的url作为prop传递给这个组件，所以当这个组件接收到prop时，它将重新渲染，文件将被下载。

编辑:你也可以使用js-file-download模块。链接到Github回购

const FileDownload = require('js-file-download');

Axios({
  url: 'http://localhost/downloadFile',
  method: 'GET',
  responseType: 'blob', // Important
}).then((response) => {
    FileDownload(response.data, 'report.csv');
});

诀窍是在render()中创建一个不可见的锚标记，并添加一个React ref，允许在我们有axios响应时触发单击:

class Example extends Component {
    state = {
        ref: React.createRef()
    }

    exportCSV = () => {
        axios.get(
            '/app/export'
        ).then(response => {
            let blob = new Blob([response.data], {type: 'application/octet-stream'})
            let ref = this.state.ref
            ref.current.href = URL.createObjectURL(blob)
            ref.current.download = 'data.csv'
            ref.current.click()
        })
    }

    render(){
        return(
            <div>
                <a style={{display: 'none'}} href='empty' ref={this.state.ref}>ref</a>
                <button onClick={this.exportCSV}>Export CSV</button>
            </div>
        )
    }
}

以下是文档:https://reactjs.org/docs/refs-and-the-dom.html。你可以在这里找到类似的想法:https://thewebtier.com/snippets/download-files-with-axios/。

你需要返回File({file_to_download}， "application/vnd.ms-excel")从后端到前端，在你的js文件中，你需要更新下面写的代码:

function exportToExcel() {
        
        axios.post({path to call your controller}, null,
            {
                headers:
                {
                    'Content-Disposition': "attachment; filename=XYZ.xlsx",
                    'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
                },
                responseType: 'arraybuffer',
            }
        ).then((r) => {
            const path= window.URL.createObjectURL(new Blob([r.data]));
            const link = document.createElement('a');
            link.href = path;
            link.setAttribute('download', 'XYZ.xlsx');
            document.body.appendChild(link);
            link.click();
        }).catch((error) => console.log(error));
    }

对于axios POST请求，请求应该是这样的: 这里的关键是responseType和header字段必须在Post的第3个参数中。第二个参数是应用程序参数。

export const requestDownloadReport = (requestParams) => async dispatch => { 
  let response = null;
  try {
    response = await frontEndApi.post('createPdf', {
      requestParams: requestParams,
    },
    {
      responseType: 'arraybuffer', // important...because we need to convert it to a blob. If we don't specify this, response.data will be the raw data. It cannot be converted to blob directly.
      headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/pdf'
      }
  });          
  }
  catch(err) {
    console.log('[requestDownloadReport][ERROR]', err);
    return err
  }

  return response;
}

Axios。后解决方案与IE和其他浏览器

我在这里找到了一些不可思议的解决方案。但他们通常不会考虑IE浏览器的问题。也许这样可以为别人节省一些时间。

axios.post("/yourUrl",
    data,
    { responseType: 'blob' }
).then(function (response) {
    let fileName = response.headers["content-disposition"].split("filename=")[1];
    if (window.navigator && window.navigator.msSaveOrOpenBlob) { // IE variant
        window.navigator.msSaveOrOpenBlob(new Blob([response.data],
                { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }
            ),
            fileName
        );
    } else {
        const url = window.URL.createObjectURL(new Blob([response.data],
            { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }));
        const link = document.createElement('a');
        link.href = url;
        link.setAttribute('download',
            response.headers["content-disposition"].split("filename=")[1]);
        document.body.appendChild(link);
        link.click();
    }
    }
);

上面的例子适用于excel文件，但是稍加改变就可以应用于任何格式。

在服务器上，我这样做是为了发送一个excel文件。

response.contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"

response.addHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=exceptions.xlsx")