Node.js入门教程——如何实现文件上传功能

  作者：zhanhailiang 日期：2014-11-16

本文将介绍如何使用Node.js实现文件上传功能。

1. 初始化项目信息：npm init

[root@~/wade/nodejs/nodejs-upload-image-demo]# npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sane defaults.
 
See `npm help json` for definitive documentation on these fields
and exactly what they do.
 
Use `npm install <pkg> --save` afterwards to install a package and
save it as a dependency in the package.json file.
 
Press ^C at any time to quit.
name: (nodejs-upload-image-demo)
version: (1.0.0)
description: how to use node.js to upload an image
entry point: (index.js)
test command:
git repository: (https://github.com/billfeller/nodejs-upload-image-demo.git)
keywords:
author: billfeller
license: (ISC) MIT
About to write to /root/wade/nodejs/nodejs-upload-image-demo/package.json:
 
{
  "name": "nodejs-upload-image-demo",
  "version": "1.0.0",
  "description": "how to use node.js to upload an image",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/billfeller/nodejs-upload-image-demo.git"
  },
  "author": "billfeller",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/billfeller/nodejs-upload-image-demo/issues"
  },
  "homepage": "https://github.com/billfeller/nodejs-upload-image-demo"
}
 
 
Is this ok? (yes) yes

2. 修改package.json，配置启动命令：

"scripts": {
    "start": "node index.js"
},

3. 安装依赖模块：npm install formidable –save

4. 功能实现：

• index.js——统一入口，包括请求处理器注册；
• server.js——服务器模块，包括服务器创建，监听请求，执行路由策略；
• router.js——路由策略，根据请求url路由到相应的处理器进行请求处理；
• requestHandler.js——请求处理器；

  完整源码请见：https://github.com/billfeller/nodejs-upload-image-demo

5. 启动服务器：

[root@~/wade/nodejs/nodejs-upload-image-demo]# npm start
 
> nodejs-upload-image-demo@1.0.0 start /root/wade/nodejs/nodejs-upload-image-demo
> node index.js
 
server is starting

6. 通过浏览器访问并上传图片：

6. 参考：

• Node入门
• nodebeginner