nodejs 上传图片(服务端输出全部代码)

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