Egg.js 中 AJax 上传文件获取参数的方法

 
单文件，Ajax
 

  

   
  
  

   
  
  

   
  
 



 
多文件，Ajax
 

  

   
  
  

   
  
 

'use strict';
const fs = require('fs');
const path = require('path');
const awaitWriteStream = require('await-stream-ready').write;
const sendToWormhole = require('stream-wormhole');
const formidable = require("formidable");
const Controller = require('../../core/base_controller');
class FileController extends Controller {
 async parse(req) {
  const form = new formidable.IncomingForm();
  return new Promise((resolve, reject) => {
   form.parse(req, (err, fields, files) => {
    resolve({ fields, files })
   })
  });
 }
 /**
 * 上传文件，兼容单文件和多文件
 * @param customName 单文件自定义文件名
 * @param isAjax 上传方式
 */
 async upload() {
  const { ctx, logger } = this;
  const extraParams = await this.parse(ctx.req);
  let { multipleFile, customName, isAjax } = extraParams && extraParams['fields'];
  logger.info(multipleFile, customName, isAjax);
  if (isAjax === 'yes') {
   const urls = [];
   for (let key in extraParams.files) {
    const file = extraParams.files[key];
    logger.info('file.name', file.name);
    logger.info('customName', customName);
    const stream = fs.createReadStream(file.path);
    const fileName = customName ? (customName + path.extname(file.name)) : file.name;
    const target = path.join(this.config.baseDir, 'app/public/upload', fileName);
    const writeStream = fs.createWriteStream(target);
    try {
     await awaitWriteStream(stream.pipe(writeStream));
    } catch (err) {
     await sendToWormhole(stream);
     throw err;
    }
    urls.push(target);
   }
   this.success({ urls })
  }
 }
}
module.exports = FileController;