Ant Design Pro 下实现文件下载的实现代码

最近编写在页面内通过 AJAX 请求服务器下载文件遇到一些问题，网上找的资料和介绍大多不健全不系统，最终自己摸索出来的解决方案，先简单写个初稿，后面再详细补充。

表一：前端请求后端下载文件的各种情况

首先，需要在 src/service/api.js 里声明对应请求返回的文件类型：

import request from '@/utils/request';

export async function Download(params = {}) {
return request(`/api/download`, {
method: 'POST', // GET / POST 均可以
data: params,
responseType : 'blob', // 必须注明返回二进制流
});
}

然后在对应的 Model 里编写相关请求处理的业务逻辑：

import { message } from 'antd';
import { Download } from '@/services/api';

export default {
namespace: 'download',

state: {},

effects: {
*download({ payload, callback }, { call }){
const response = yield call(Download, payload);
if (response instanceof Blob) {
if (callback && typeof callback === 'function') {
callback(response);
}
} else {
message.warning('Some error messages...', 5);
}
}
},

reducers: {},
}

最后编写页面组件相关业务逻辑，点击下载按钮，派发下载 action 到 model ：

import React, { Component } from 'react';
import { Button } from 'antd';
import { connect } from 'dva';

@connect(({ download, loading }) => ({
download,
loading: loading.effects['download/download'],
}))
class ExampleDownloadPage extends Component {
handleDownloadClick = e => {
e.preventDefault();
const { dispatch } = this.props;
const fileName = 'demo.xlsx';

dispatch({
type: 'download/download',
payload: {}, // 根据实际情况填写参数
callback: blob => {
if (window.navigator.msSaveOrOpenBlob) {
navigator.msSaveBlob(blob, fileName);
} else {
const link = document.createElement('a');
const evt = document.createEvent('MouseEvents');
link.style.display = 'none';
link.href = window.URL.createObjectURL(blob);
link.download = fileName;
document.body.appendChild(link); // 此写法兼容可火狐浏览器
evt.initEvent('click', false, false);
link.dispatchEvent(evt);
document.body.removeChild(link);
}
}
});
}

render(){
const { loading } = this.props;

return <Button
loading={loading}
icon="download"
onClick={this.handleDownloadClick}
>
下载
</Button>;
}
}

大功告成！~~

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