koa上传excel文件并解析的实现方法

npm install koa-body --save

const koaBody = require('koa-body');app.use(koaBody({ multipart: true, formidable: {  maxFileSize: 200 * 1024 * 1024 // 设置上传文件大小最大限制，默认2M }}));

const errorResult = require('../utils/errorResult.js');const uploadExcelSrv = require('../service/uploadExcelSrv');const saveData = async function (ctx, next) { const getRes = await uploadExcelSrv.getExcelObjs(ctx); if (getRes.status) {  if (getRes.datas.length > 1) {   errorResult.errorRes(ctx, '暂时不支持多个sheet存在');  } else { //得到的是数组   const objs = getRes.datas[0];   ctx.body = {    status: true,    msg: '上传数据成功'   };  } } else {  errorResult.errorRes(ctx, getRes.msg); } await next();};module.exports = { saveData};

npm install xlsx --save

//接收上传的excel文件，保存解析返回objectsconst xlsx = require('xlsx');const fs = require('fs');const path = require('path');const downPath = path.resolve(__dirname, '../../fileUpload');async function getExcelObjs (ctx) { const file = ctx.request.files.file; // 获取上传文件 const reader = fs.createReadStream(file.path); // 创建可读流 const ext = file.name.split('.').pop(); // 获取上传文件扩展名 const filePath = `${downPath}/${Math.random().toString()}.${ext}`; const upStream = fs.createWriteStream(filePath); // 创建可写流 const getRes = await getFile(reader, upStream); //等待数据存储完成 const datas = []; //可能存在多个sheet的情况 if (!getRes) { //没有问题  const workbook = xlsx.readFile(filePath);  const sheetNames = workbook.SheetNames; // 返回 ['sheet1', ...]  for (const sheetName of sheetNames) {   const worksheet = workbook.Sheets[sheetName];   const data = xlsx.utils.sheet_to_json(worksheet);   datas.push(data);  }  return {   status: true,   datas  }; } else {  return {   status: false,   msg: '上传文件错误'  }; }}function getFile (reader, upStream) { return new Promise(function (result) {  let stream = reader.pipe(upStream); // 可读流通过管道写入可写流  stream.on('finish', function (err) {   result(err);  }); });}module.exports = { getExcelObjs};