JavaScript下载后端返回的文件流

Posted 2022-11-28 码上暴富

javascript下载后端返回的文件流

• JavaScript下载后端返回的文件流(方法一)
• JavaScript下载后端返回的文件流(方法二)

JavaScript下载后端返回的文件流(方法一)

后端返回的结果

/* 创建一个js写以下代码 */
import axios from 'axios';
/*
先安装： npm install js-file-download
main.js引入  import fileDownload from 'js-file-download';
* */
/*
* url: 请求接口地址
* fileName: 文件名，例如: ccc.png
* */
export function $fileDownload(url, fileName, config = ) 
    axios.request(
        url: url,
        method: "get",
        data: config.data,
        responseType: 'blob'
    ).then(
        response => 
            console.log("fileName: ", fileName)
            let fileDownload = require('js-file-download');
            fileDownload(response.data, fileName);
            if (typeof config.resolve === 'function') 
                config.resolve();
            
        ,
        error => 
            let hasError = true;
            if (error.response) 
                const status = error.response.status;
                if (status === 401) 
                    hasError = false;
                
            
            if (hasError) 
                this.$showError('下载出错，请稍后再试');
            
            if (typeof config.reject === 'function') 
                config.reject();
            
        
    );

/* 
* 引入import $fileDownload from "../../plugin/utils";
* 然后在methods中调用封装的$fileDownload即可 
*/
// 打开附件
openFile (item) 
	console.log(item);
	/*item 
		id: "D64C87AD4AF51CCFE0537C0AA8C0A129"
		trainingManagementId: "D3E0484993A472DCE0537C0AA8C01C26"
		fileName: "cls_jpg1.jpg"
		filePath: "/data/apcos/6332/app-standard/app-standard/cdtraining/2022_01_24/c1ff8d5b-f254-4297-b4cb-20839a4316f2cls_jpg1.jpg"
		createTime: "2022-01-24 11:26:10"
	*/
	let url = `$this.url/cdtraining/api/download?id=$item.id`
	$fileDownload(url, item.fileName)
,

结果

JavaScript下载后端返回的文件流(方法二)

  methods: 
    // 打开附件
    openFile(item) 
      this.$axios.get('api', 
        responseType: 'arraybuffer'
      ).then(res => 
        let dt = `data: image/jpeg;base64,$btoa(new Uint8Array(res.data).reduce((data, byte) => data + String.fromCharCode(byte), ''))`;
        console.log("dt: ", dt);
      );
      // console.log(item);
      // let url = `$this.url/upload/downloadFile?fileAddress=$item.other&fileName=$item.fileAddress`
      // $fileDownload(url, item.fileAddress)
    ,

结果