nodejs上传图片并展示

效果图

服务模块

var http = require("http");

var url = require("url");

function start(route,handle){

function onRequest(request,response){

var pathname = url.parse(request.url).pathname;

if (pathname != "/favicon.ico") {

console.log("Request for" + pathname + " received");

route(handle,pathname,response,request);

}

http.createServer(onRequest).listen(8888);

console.log("Server has started");

}

exports.start = start;

路由模块

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/plain"});

response.write("404 not found");

response.end();

}

exports.route = route;

请求处理模块

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();

console.log("about to parse");

form.parse(request, function(error, fields, files) {

console.log("parsing done");

var readStream = fs.createReadStream(files.upload.path);

var writeStream=fs.createWriteStream("./tmp/test.png");

readStream.pipe(writeStream);

readStream.on('end',function(){

fs.unlinkSync(files.upload.path);

});

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("./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;

index.js

var server = require("./server");

var router = require("./route");

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);

访问:http://localhost:8888/start

转载于:https://blog.51cto.com/suyanzhu/1894091

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