对于新闻热门网站，服务器重新加载页面有哪些好方法？

Question

Which good ways exists to reload front page by server every time that new article placed by editor in front page for (news popular website like fox.com, cnn.com)?

Thanks

Answer 1

You are looking for some asynchronous client/server communication.

• You can either periodically poll the server (query it every x time unit), can result in wasted queries (in form of HTTP requests) and subsequently waste bandwidth, if lots of polls find no new data.
• Or use what has been dubbed as "server push" which leaves an HTTP connection open for the server to push the updates back to the browser, without polling.

GWT and GWT-RPC:

Since you are on Java, I recommend you have a look at GWT, will simplify your "AJAX" work with its GWT-RPC. In GWT you use Java language on both the server-side and the client-side (compiled to JavaScript), and will handle all the implementation details on the asynchronous communication under the hood.

To do the polling here, you can have a timer on the client-side (on the webpage) that will call a method that you have written on the server to give the data, can either be a String that represents some news, or even encapsulate it into a News class, with title, summary, body, and timestamp etc. The News class will then have to be in a shared (between client and server) Java package, so the implementation can be used on both sides without having you duplicating code.

GWT Comet:

This gwt-comet library provides an efficient Comet implementation for GWT.

The library implements Comet by streaming messages over long lived HTTP requests to minimise latency and bandwidth requirements and maximise the throughput. This is opposed to many other implementations which use polling or long polling techniques.

http://code.google.com/p/gwt-comet/