Redirecting to different view JSP based on device type i.e. mobile/tablet/desktop at portal serverside

IBM websphere supports client profile information in portlets which is defined in JSR188 (https://jcp.org/en/jsr/detail?id=188)

You can check if client request is coming from mobile/tablet or from desktop and redirect to different view accordingly with following sample code

String VIEW_JSP = "desktopView";

javax.ccpp.Profile profile = (javax.ccpp.Profile) portletRequest.getAttribute("javax.portlet.ccpp");

javax.ccpp.Attribute attr = profile.getAttribute("DeviceClass");

if(attr!=null && attr.toString().equals("tablet")){

VIEW_JSP = "tabletView";

}else if(attr!=null && attr.toString().equals("smartphone")){

VIEW_JSP = "mobileView";

}

NOTE: 

1. DeviceClass=smartphone/tablet
2. Vendor=Apple/Samsung ..etc

Ref:

https://www-01.ibm.com/support/knowledgecenter/SSYJ99_6.1.5/com.ibm.wp.exp.doc_v615/dev/wpsccpp.html?lang=en