【nodejs】文件上传demo实现

文件结构：

index.js

var server = require('./server.js');
var router = require('./router.js');
var requestHandlers = require("./requestHandlers");

var handle = {}
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
handle["/show"] = requestHandlers.show;

server.start(router.route,handle);

 

server.js

var http = require("http");
var url = require("url");

function start(route,handle){
    function onRequest(request,response){
        var postData = "";
        var pathname = url.parse(request.url).pathname;

        // request.setEncoding("utf8");

  //       request.addListener("data", function(postDataChunk) {
  //             postData += postDataChunk;
  //             console.log("Received POST data chunk '"+
  //             postDataChunk + "'.");
  //           });

  //       request.addListener("end", function() {
  //             route(pathname,handle, response, postData);
  //       });

          route(pathname,handle, response, request);
    }
    http.createServer(onRequest).listen(8888);
}
exports.start=start;

 

router.js

function route(pathname,handle,response,request) {
    var handler = handle[pathname];
    console.log(handler);
    if(typeof handler == "function"){
        handler(response,request);
    }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;

 

requestHandlers.js

var querystring = require("querystring"),
    fs = require("fs"),
    formidable = require("formidable");

function start(response,request) {
     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="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.");
    // response.writeHead(200, {"Content-Type": "text/plain"});
    // response.write("You've sent: " + postData);
    // response.end();
    var form = new formidable.IncomingForm();
    form.uploadDir='tmp';
    console.log("about to parse");
    form.parse(request, function(error, fields, files) {
        console.log("parsing done");
        fs.renameSync(files.upload.path, "./tmp/test.png");
        response.writeHead(200, {"Content-Type": "text/html"});
        response.write("received image:<br/>");
        response.write("<img src='/show' />");
        response.end();
    });
}

function show(response, request) {
  console.log("Request handler 'show' was called.");
  fs.readFile("./tmp/test.png", "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;

 

　　本文中代码参考自http://www.nodebeginner.org/index-zh-cn.html#javascript-and-nodejs

posted @ 2016-07-11 20:20  很好玩  阅读(2344)  评论(0)  编辑  收藏  举报