下面代码，全部都是nodejs端的，不用客户端代码。也就是，选择图片的form表单以及上传完毕预览图片的html，都是由node服务端输出的。
1 启动代码：（node upload.js）
var server = require("upload/server"); var router = require("upload/router"); var requestHandlers = require("upload/requestHandlers"); var handle = {} handle["/"] = requestHandlers.start; handle["/start"] = requestHandlers.start; handle["/upload"] = requestHandlers.upload; handle["/show"] = requestHandlers.show; server.start(router.route, handle);
2 自己封装成upload模块，也就是在node_modules文件夹下有一个upload文件夹。该文件夹下有3个文件，分别如下：
requestHandlers.js
var querystring = require("querystring"), fs = require("fs"), formidable = require("formidable"); function start(response) { console.log("Request handler 'start' was called."); var body = '<html>'+ '<head>'+ '<meta http-equiv="Content-Type" content="text/html; '+ 'charset=UTF-8" />'+ '</head>'+ '<body>'+ '<form action="/upload" enctype="multipart/form-data" '+ 'method="post">'+ '<input type="file" name="upload" multiple="multiple">'+ '<input type="submit" value="Upload file" />'+ '</form>'+ '</body>'+ '</html>'; response.writeHead(200, {"Content-Type": "text/html"}); response.write(body); response.end(); } function upload(response, request) { console.log("Request handler 'upload' was called."); var form = new formidable.IncomingForm(); form.uploadDir = "F:\nodeTemp\upload"; console.log("about to parse1"); form.parse(request, function(error, fields, files) { console.log("parsing done"); console.log(files.upload.path); fs.renameSync(files.upload.path, "F:\nodeTemp\upload\test.png"); response.writeHead(200, {"Content-Type": "text/html"}); response.write("received image:<br/>"); response.write("<img src='/show' />"); response.end(); }); } function show(response) { console.log("Request handler 'show' was called."); fs.readFile("F:\nodeTemp\upload\test.png", "binary", function(error, file) { if(error) { response.writeHead(500, {"Content-Type": "text/plain"}); response.write(error + " "); response.end(); } else { response.writeHead(200, {"Content-Type": "image/png"}); response.write(file, "binary"); response.end(); } }); } exports.start = start; exports.upload = upload; exports.show = show;
router.js
function route(handle, pathname, response, request) { console.log("About to route a request for " + pathname); if (typeof handle[pathname] === 'function') { handle[pathname](response, request); } else { console.log("No request handler found for " + pathname); response.writeHead(404, {"Content-Type": "text/html"}); response.write("404 Not found"); response.end(); } } exports.route = route;
server.js
var http = require("http"); var url = require("url"); function start(route, handle) { function onRequest(request, response) { var pathname = url.parse(request.url).pathname; console.log("Request for " + pathname + " received."); route(handle, pathname, response, request); } http.createServer(onRequest).listen(3001); console.log("Server has started."); } exports.start = start;
3 这个上传图片，是依赖formidable模块的，所以，需要提前通过npm安装好该模块。
4 还有，这个上传图片，要自己先建立一个文件夹来存放图片。建好之后，把“F:\nodeTemp\upload\test.png”替换就行。
原文：http://www.cnblogs.com/EricaMIN1987_IT/p/3640450.html
我根据自己的理解，改动了下。
可参考：
http://www.cnblogs.com/thingk/archive/2013/11/25/3434032.html