在EAR之间共享JSP

Question

Is it possible to share JSPs between EARs, similar to the way that we can share Java files between EARs by using .jar files?

I have a large J2EE app on JBoss with many different EARs, and they all should have the same header, footer, etc... I would rather not copy and paste these files a dozen times whenever a change needs to be made.

Answer 1

Tag files can be packaged in a jar.

They are JSP files with a ".tag" extension. They can be parameterized.

Answer 2

我从未尝试过，但从逻辑上讲，通过将所有JSP放入一个公共文件夹中，您可以很好地做到这一点

Answer 3

I think of it as accessing a different servlet context from the one you are in. Something like

Enterprise.ear
  WAR1 /somewhere
  WAR2 /somewhereElse
  WAR3 /shared

Assuming a JSP in WAR1 bound to /somewhere:

Reference the shared context with the optional 'context' attribute of the c:import tag (Standard JSTL tag). By default c:import uses the context it is in, which in war1 is /somewhwere.

<c:import url="/header.jsp"  context="/shared"/>

There are probably other ways... Perhaps just ignore your ear and just go with a full http request:

<c:import url="http://www.somewhere.com/header.jsp"/>

I'm not certain on the syntax of the context attribute on the c:import tag. But I believe that is the correct syntax (with the slash verse without, it might not matter).

Answer 4

Use sitemesh. There is no need to change anything in the existing application. Create a fresh war with sitemesh. It can decorate content from multiple urls dynamically.

http://raibledesigns.com/rd/entry/use_sitemesh_to_decorate_multiple

--Kiran.kumar