您将如何为网站用户群制作即时通讯程序？
我有一个设计类似于 myspace/facebook 类型社区的社交网站，我在 LAMP 设置上使用 php/mysql。
我一直想拥有自己的即时通讯工具，可以在用户的 PC 上运行，类似于 AIM，可以
与我的网站一起使用，这意味着程序中的好友列表将由我网站上的用户组成，并且还会在旁边显示用户图像
我网站上的姓名和个人资料的链接。
现在我知道这是可能的，但让我不想这样做的是它会占用服务器资源。 所以我想问一下，
如果你要做这件事，你会怎么做？
您会用什么语言来制作 .exe 程序？
有没有办法让一个用户连接到另一个用户，这样他们之间的每条消息都不会到达我的 mysql 数据库？
欢迎任何提示/意见/建议
I have a social network site similar in design to a myspace/facebook type community, I am using php/mysql on a LAMP setup.
I have always wanted to possibly have my own instant messenger that would go on a user's PC similar to AIM that would work
with my site, meanning a buddylist in the program would consist of users on my site and also to show a users image next to
the name and a link to there profile on my site.
Now I know this is possible but what would make me not want to do it is the server resources it would take. So I am asking,
if you were to do this, how would you go about it?
What language would you make the .exe program in?
Is there someway to make a user connect to another user so that each message between them is not hitting my mysql DB?
Any tips/advice/suggestions welcome
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使用 JAVA（和 XML）或任何其他语言编写 SOAP（简单对象访问协议）更加容易和快捷。
coding SOAP (Simple Object Access Protocol) using JAVA (and XML) or any other language is much easier and faster.
我建议您使用 XMPP，Jabber 的核心协议。
http://xmpp.org/
这是许多网站使用的协议，例如 Google Talk。
如果你想明显地保存日志，你将需要一个数据库。 如果是纯实时的，那么可能不需要通过数据库来存储消息。
如果您只是想在您的网站上使用 ajax 聊天功能，您应该在线搜索，因为有很多这样的功能。 如果您只想要一个通用聊天服务器，只需使用 Jabber 或 IRC。
I recommend that you use XMPP, the core protocol for Jabber.
http://xmpp.org/
It is a protocol that many websites use such as Google Talk.
You will need a database if you want to keep logs obviously. If it is purely real-time, then you may not need to store messages through the database.
If you simply want an ajax chat feature on your website, you should just search online as there are a ton of them. If you simply want an all purpose chat server, just use a Jabber or IRC.
点对点聊天与任何类型的 p2p 系统都有相同的缺陷，那就是几乎每个人都坐在硬件防火墙后面。 实际上，他们都不知道如何更改防火墙规则，更不用说知道如何更改防火墙规则了。
不过，您不必让聊天服务器访问您的数据库。 最简单的聊天协议实际上只不过是某种代理。 客户端A连接到服务器，客户端B连接到服务器，来自客户端A的消息被转发到客户端B。非常快，非常简单，可以处理很多客户端（我们这里说的是数千个）。 我建议您实施有限的消息缓存（例如 5 到 10 条消息），因为当随机消息被丢弃时，很少有事情会让两个聊天的人感到困惑。 缓存一些消息，要求客户端为每条消息发送 ACK 信号……等等。
Peer to peer chats have the same pitfalls as any sort of p2p system and that is that pretty much everyone is sitting behind a hardware firewall. Practically none of them know how to change their firewall rules and even less would anyway.
You don't have to make a chat server hit your DB though. The simplest chat protocol would really be nothing more than a proxy of sorts. Client A connects to server, client B connects to server, message from client A is forwarded to client B. Really fast, really simple, can handle a lot of clients (We're talking thousands here.). I would recommend you implement a limited message cache (say 5 to 10 messages) because few things confuse two people chatting as random messages getting dropped. Cache a few of the messages, demand ACK signals from the clients for every message... etc. etc. etc.