Xxx java chat

Step 1: Create a server that idles until someone connects to it, then prints out a message and closes.

Create a client that connects to a server and gets a message and closes. ---------- This first step serves two purposes: 1) We see the basic idea. I recommend changing "localhost" to "127.0.0.1" then to your intranet IP address then to your IP address if you wish to open this up to outside access.

I have promised a friend to teach him simple server-client programming in java.

The reason I post here is because many people here know how to do things better than me, so if anyone reading this (that means YOU) sees something wrong, don't hesitate to point it out.

Before we continue with B), which is two-way communication, and A), which is a packet system, let's instead rethink our logic slightly.

Second, before a user enters a chat room, what is there to receive his packets?

Instead, I will keep a single socket handle per Account Handler instance; one instance per connected user.

Here we have something that will catch all sorts of exceptions and tell you what's what. In its most basic form, it will have the username and the socket. Next, let's have the server class that can handle multiple connections now. In accept Connections(), we have temporarily put a message to be sent twice to the client.

This is very useful to learn when an exception can occur; as you progress you can ignore most of these. We can immediately add more: An output stream to write to the socket, and a buffer of messages to send. What we do here is this: First, we map users to their account classes and we list the users. As you can see above, we have a 5 second delay between messages so that you have time to open multiple clients to see that they run simultaneously.

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