Koa2文件上传实现

这段示例代码展示了如何使用koa-body中间件实现文件上传功能，同时也演示了如何进行文件流式读取和操作，并将其保存在服务器端的指定路径下。

const Koa = require('koa');
const koaBody = require('koa-body');
const fs = require('fs');
const path = require('path');

const app = new Koa();

app.use(koaBody({
  multipart: true,
  formidable: {
    maxFileSize: 200 * 1024 * 1024,
    uploadDir: path.join(__dirname, '/upload/')
  }
}));

app.use(async (ctx) => {
  const file = ctx.request.files.file;
  const reader = fs.createReadStream(file.path);
  const writer = fs.createWriteStream(path.join(__dirname, '/upload/' + file.name));
  reader.pipe(writer);
  console.log('上传成功！');
  ctx.body = '上传成功！';
});

app.listen(3000, () => {
  console.log('服务器已启动！');
});

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