upload pictures, can preview, there is a progress bar, support drag-and-drop upload (Baidu Webuploader). List dynamic slide zoom display. 23.ehcache Custom Level Two cache, choose cache to store directory, handle concurrency, increase system performance 24. Server internal get POST request 25.uploadify upload plugin, single, batch upload, with progress bar, asynchronous, image, video, other file formats can be uploaded 26. Map points to obtain latitude and longitude coordinates, based on the t
again immediately.The advantage of long polling over general polling is that once the data is available, it is immediately sent from the server to the client. The request may wait for a longer period without any data being returned, but once the new data is available, it is immediately sent to the client. So there is no delay. If you have used a WEB-based chat program, or any program that claims to be "in
) { varNameSpace =Getfullasemmblypath (className); Type T=Type.GetType (nameSpace); IT instance=(IT) activator.createinstance (t); returninstance; } }Then, the controller changes slightly. This controller only wants to have an instance object that implements the Iuser interface, which is not related to whether you use MySQL or SQL Server internally, which allows the controller and the BLL layer to be decoupled. Of course I do a lot of work behind, the code is not all sticky. Run b
Recently, when I was working on a chat room, I had to worry about how to promptly clean up offline users,
I found very wrong information on the Internet. I feel that many people are asking this question. The answer is basically the following two.
1. Use js to control page events and process and judge in onUnload and onbeforeunload events. Although a good one is found
Determine whether the user refreshes the page or closes the page, but the problem is
HTTP related knowledge
HTTP is a stateless, request, Response mode communication mode, that is, each time a user clicks through a browser page, you need to re-establish a connection with the Web server, and send their session ID to the server side to the server side to verify the identity of this user. To obtain data from a Web server, the client must proactively initiate a request and then receive
WebSocket + node. js: Create an instant messaging Web chat server, websocketnode. js
In this example, node. js creates an instant messaging Web chat server for your reference. The details are as follows:
1. Use nodejs-websocketNodejs-websocket is a backend library that implements the websocket protocol based on node. j
() {@Overridepublic voidrun () { Server.destroy ();}}); F.channel (). Closefuture (). syncuninterruptibly ();}} Initialize chain: public class Chatserverinitializer extends channelinitializer HTTP request Processing: Publicclasshttprequesthandlerextendssimplechannelinboundhandler WebSocket Processing: publicclasstextwebsocketframehandlerextendssimplechannelinboundhandler Page index.html Code: After you run the main program, type in the browser that supports WebSocket: 127.0.0.1:2048 can
friends, start chatting." "Message.SummarizeOriginal aim, in fact, as long as the master, the message push mechanism, can realize the client and the server side of the Unicom. Message push can do any business. Today's buddy process is here. Are you going to do it?Next trailer :"Intermediate" ASP. SignalR with LayIM2.0 easy to implement the web chat room (vi) Layim Source Modification Right-click menu-Frien
Since this series of blog writing, many students concerned about open source issues, before due to network problems, released to GitHub always failed, today finally in streamlining a lot of useless files after the release. Note: Layim source code is not open source, due to copyright issues, please go to the official website to learn more, I am not Layui author, the original author Yin Xin. Open source content is part of the background. details :ASP. NET SignalR and LayIM2.0 with easy implem
Use the Select module in the Python module to implement web chat room functionalitySelect moduleThe Select module in Python focuses on I/O multiplexing, provides a select poll Epoll three methods (where the latter two are available in Linux, Windows supports select only), and also provides the Kqueue method (FreeBSD system)Parameters: accepts four parameters (the first three must be)Rlist:wait until ready f
This article mainly introduces the PHP Web version of the chat software implementation code, can achieve anonymous chat, interested in small partners can refer to
Specific content is as follows
1. index.html
2. action.php
3. Chat.sql
DROP TABLE IF EXISTS ' talk '; CREATE TABLE ' Talk ' (' id ' int (ten) unsigned not NULL auto_increment COMMENT ' id ', ' s
'); App.listen (8888); function Handler (req,res) {//__dirname Returns the current directory in which the file resides. Call the ReadFile method to read the file Fs.readfile (__dirname+ '/index.html ', function (err,data) {if (err) {Res.writehead (500 ); Return res.end (' error '); } res.writehead (200); Res.end (data); });} The above steps successfully render the corresponding HTML interface on port 8888//conn is the corresponding connection instance var server = Ws
This article node.js to create an Instant Messaging Web chat server for your reference, the details are as follows
1. Use of Nodejs-websocketNodejs-websocket is a library of backend implementation WebSocket protocol based on Node.js.Connection:https://github.com/sitegui/nodejs-websocket. (1) installation installed in the project directory via NPM: NPM install Nodejs-websocket(2) Create a server
In
=obj.userid;This code is to locate the avatar under the uservarImgobj = $ (' #layim-friend ' + userid). find (' img ')); if(imgobj.length) {if(obj.online) {//If you are online, change your avatar to your original avatar, which is a non-black and white avatarImgobj.attr (' src ', avatar); } Else { //Place the Avatar blackGrayscale (imgobj); } } }So far, functional development is Over.SummarizeThis article is relatively more than the previous one,
1, open the browser, and then enter the micro-letter Web page address http://wx.qq.com/, carriage return;
2, then open the phone above the micro-letter, find the "discovery-sweep", and then the scanning micro-letter Web version of the interface of two-dimensional code;
3, after the successful scan, micro-letter Web version will prompt "Successful
*/@Override public void Ontextmessage (Charbuffer cb) throws Ioexce ption {for (Mymessageinbound mmib:userlist) {//loop sends the current user's information to all online users charbuffer buffer = Charbuffe R.wrap (CB); Mmib.myoutbound.writeTextMessage (buffer); Invokes the sending method of the specified user to send the current user information mmib.myoutbound.flush (); Empty Cache}}/** * has binary message data arrives, temporarily did not study this function under what circumstances
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