通信客户端-服务器-客户端 [英] Communication client-server-client

问题描述

我对客户端和服务器之间的通信有疑问.

I have a question about the Communication between a client and a server.

我想创建一个可以执行以下操作的GWT应用程序:

I would like to create a GWT application that can do the following:

客户端A向服务器触发事件​​，而服务器依次向客户端B触发事件. 在这里，客户端B必须能够一直收听事件.

The client A fires an event to the server and the server in his turn fire an event to the client B. Here the client B has to be able to listen to the event all the time.

我想向连接的客户端B实时发送一些数据很少的事件. 那可能吗?如果是的话，我该怎么办?

I wanted to send some event with few data in real time to a connected client B. is that possible? and if yes how can I do that?

谢谢

推荐答案

客户端B必须始终能够收听事件.

Here the client B has to be able to listen to the event all the time.

要让客户端等待数据，如果目标JS运行时确实支持，则可以使用Comet [1](HTTP请求长期存在)或WebSockets [2].

To let client wait for data, you can use Comet [1] (long lived HTTP requests) or WebSockets [2] if targetted JS runtime does support it.

[1]: http://code.google.com/p/gwt-comet /

[2]: http://code.google.com/p/gwt-ws /

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