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Node.js formidable 上传文件的实现
本案例来自Node.js入门书籍:
http://www.nodebeginner.org/index-zh-cn.html
示例中只能上传并展示png图片,当然其他文件都是可行的,自己微调一下即可。
安装node.js:
# curl -sL https://rpm.nodesource.com/setup | bash -# yum install -y nodejs
防火墙打开8888端口;
Node.js自身处理上传文件会非常繁琐,可使用第三方的node-formidable来轻松处理:
npm install formidable
以下是代码:
Server端:
#server.js
var http = require("http");var url = require("url");var order = 1; //请求次数function start(route, handle) { function onRequest(request, response) { var postDatahttp://www.mamicode.com/= ""; var pathname = url.parse(request.url).pathname; //请求位置 console.log("Request for " + pathname + " received."); route(handle, pathname, response, request); //路由此次请求 console.log("Reauest received ~ +" + order); //请求次数 order++; } http.createServer(onRequest).listen(8888); //监听8888端口 console.log("Server has started");}exports.start = start;
路由:
#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); //执行请求处理方法 } else { console.log("No request handler found for " + pathname); response.writeHead(404, { "Content-Type": "text/plain" }); response.write("404 Not found"); response.end(); }}exports.route = route;
Handler:
#requestHandlers.js
var querystring = require("querystring");var formidable = require("formidable");var fs = require("fs");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">‘ + ‘<input type="submit" value="http://www.mamicode.com/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(); console.log("about to parse"); form.parse(request, function(error, fields, files) { console.log("parsing done"); fs.renameSync(files.upload.path, "/tmp/test.png"); //更名 response.writeHead(200, { "Content-Type": "text/html" }); response.write("received image:<br/>"); response.write("<img src=http://www.mamicode.com/‘/show‘ />"); //调用show方法展示图片 response.end(); });}function show(response) { var imagePath = "/tmp/test.png"; console.log("Request handler ‘show‘ was called."); fs.readFile(imagePath, "binary", function(error, file) { if (error) { response.writeHead(500, { "Content-Type": "text/plain" }); response.write(error + "\n"); 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;
入口文件:
#index.js
var server = require("./server"); //服务端var router = require("./router"); //路由var requestHandlers = require("./requestHandlers"); //请求处理器var handle = {};handle["/"] = handle["/start"] = requestHandlers.start;handle["/upload"] = requestHandlers.upload;handle["/show"] = requestHandlers.show;server.start(router.route, handle); //初始函数 - 参数为路由方法及相应的处理方法
将这些扔到一个文件夹中,启动:
# node index.js
浏览器访问:http://yourhost:8888 或在其后加上/start 即可进入上传页面。
End.
Node.js formidable 上传文件的实现
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