如何从JavaBean刷新jsf页面

Question

I want to refresh an XHTML page (jsf) or part of this page, when a variable in a manageBean changes the value.

The problem is:

I have a JavaBean, which receives data from a webService. This data changes regularly. when a variable changes value, I want to display it in the IHM page.

I want that my application detects these changes and refresh the page automatically.

Thank you.

Answer 1

Use ajax polling. Demos:

• RichFaces 3.3 Demo
• RichFaces 4.x Demo
• PrimeFaces 3.4 Demo

Note that RichFaces 3.3 works with JSF 1.2 and JSF 2, RichFaces 4.x and PrimeFaces 3.x works with JSF 2.x

Answer 2

One quick way would be to use a third-party library like PrimedFaces

This library includes a component called poll with wich you can check your backend in a preset interval and update your view component(s) on changes.
Check out the link to see an easy example.

Hope this helpes. Have Fun!

Answer 3

您可以在jsf中使用ajax的poll选项，例如

<a4j:poll interval="timeinms" reRender="jsfcomponent"> </a4j:poll>