上傳檔案

• 前端上傳檔案一般採用表單的方式，將content-type設定為multipart/form-data
• 定義一個upload.js檔案用來處理上傳的路由
  • 此處上傳需要一箇中間件multer，使用的時候需要在安裝
    • npm i multer -S
  • 程式碼如下

  // upload.js
  const express = require('express')
  const router = express.Router()
  const fs = require('fs')
  const multer = require('multer')
  // 設定臨時檔案存放資料夾
  const upload = multer({dest: 'upload_tmp/'});
  
  router.post('/', upload.any(), function(req, res, next) {
      // 設定檔案的存放地址
      var des_file = "./upload/" + req.files[0].originalname;
      fs.readFile( req.files[0].path, function (err, data) {
          fs.writeFile(des_file, data, function (err) {
              if( err ){
                  console.log( err );
              }else{
                  response = {
                      message:'File uploaded successfully',
                      filename:req.files[0].originalname
                  };
                  res.end( JSON.stringify( response ) );
              }
          });
      });
  });
  module.exports = router
   
  

• 在app.js匯入上傳路由

  // 匯入uploadRouter路由
  const uploadRouter = require('./upload')
  app.use('/upload', uploadRouter)
  

• 使用apipost測試