正文
【nodejs】文件上传demo实现
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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
