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 postData = "";
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="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=‘/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.
时间： 2024-11-08 22:04:16